diff options
Diffstat (limited to 'Utilities/cmlibarchive/libarchive/archive_read_support_format_zip.c')
| -rw-r--r-- | Utilities/cmlibarchive/libarchive/archive_read_support_format_zip.c | 2743 |
1 files changed, 1586 insertions, 1157 deletions
diff --git a/Utilities/cmlibarchive/libarchive/archive_read_support_format_zip.c b/Utilities/cmlibarchive/libarchive/archive_read_support_format_zip.c index 2fdc08b..3f4014b 100644 --- a/Utilities/cmlibarchive/libarchive/archive_read_support_format_zip.c +++ b/Utilities/cmlibarchive/libarchive/archive_read_support_format_zip.c @@ -1,6 +1,7 @@ /*- - * Copyright (c) 2004 Tim Kientzle + * Copyright (c) 2004-2013 Tim Kientzle * Copyright (c) 2011-2012 Michihiro NAKAJIMA + * Copyright (c) 2013 Konrad Kleine * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -27,6 +28,20 @@ #include "archive_platform.h" __FBSDID("$FreeBSD: head/lib/libarchive/archive_read_support_format_zip.c 201102 2009-12-28 03:11:36Z kientzle $"); +/* + * The definitive documentation of the Zip file format is: + * http://www.pkware.com/documents/casestudies/APPNOTE.TXT + * + * The Info-Zip project has pioneered various extensions to better + * support Zip on Unix, including the 0x5455 "UT", 0x5855 "UX", 0x7855 + * "Ux", and 0x7875 "ux" extensions for time and ownership + * information. + * + * History of this code: The streaming Zip reader was first added to + * libarchive in January 2005. Support for seekable input sources was + * added in Nov 2011. + */ + #ifdef HAVE_ERRNO_H #include <errno.h> #endif @@ -51,42 +66,55 @@ __FBSDID("$FreeBSD: head/lib/libarchive/archive_read_support_format_zip.c 201102 struct zip_entry { struct archive_rb_node node; + struct zip_entry *next; int64_t local_header_offset; int64_t compressed_size; int64_t uncompressed_size; int64_t gid; int64_t uid; - struct archive_entry *entry; struct archive_string rsrcname; time_t mtime; time_t atime; time_t ctime; uint32_t crc32; uint16_t mode; - uint16_t flags; - char compression; - char system; + uint16_t zip_flags; /* From GP Flags Field */ + unsigned char compression; + unsigned char system; /* From "version written by" */ + unsigned char flags; /* Our extra markers. */ }; +/* Bits used in zip_flags. */ +#define ZIP_ENCRYPTED (1 << 0) +#define ZIP_LENGTH_AT_END (1 << 3) +#define ZIP_STRONG_ENCRYPTED (1 << 6) +#define ZIP_UTF8_NAME (1 << 11) +/* See "7.2 Single Password Symmetric Encryption Method" + in http://www.pkware.com/documents/casestudies/APPNOTE.TXT */ +#define ZIP_CENTRAL_DIRECTORY_ENCRYPTED (1 << 13) + +/* Bits used in flags. */ +#define LA_USED_ZIP64 (1 << 0) +#define LA_FROM_CENTRAL_DIRECTORY (1 << 1) + struct zip { /* Structural information about the archive. */ - int64_t end_of_central_directory_offset; + char format_name[64]; int64_t central_directory_offset; - size_t central_directory_size; - size_t central_directory_entries; - char have_central_directory; - int64_t offset; + size_t central_directory_entries_total; + size_t central_directory_entries_on_this_disk; + int has_encrypted_entries; /* List of entries (seekable Zip only) */ - size_t entries_remaining; struct zip_entry *zip_entries; - struct zip_entry *entry; struct archive_rb_tree tree; struct archive_rb_tree tree_rsrc; + /* Bytes read but not yet consumed via __archive_read_consume() */ size_t unconsumed; - /* entry_bytes_remaining is the number of bytes we expect. */ + /* Information about entry we're currently reading. */ + struct zip_entry *entry; int64_t entry_bytes_remaining; /* These count the number of bytes actually read for the entry. */ @@ -95,852 +123,363 @@ struct zip { /* Running CRC32 of the decompressed data */ unsigned long entry_crc32; + unsigned long (*crc32func)(unsigned long, const void *, size_t); + char ignore_crc32; /* Flags to mark progress of decompression. */ char decompress_init; char end_of_entry; - ssize_t filename_length; - ssize_t extra_length; - +#ifdef HAVE_ZLIB_H unsigned char *uncompressed_buffer; size_t uncompressed_buffer_size; -#ifdef HAVE_ZLIB_H z_stream stream; char stream_valid; #endif - struct archive_string extra; struct archive_string_conv *sconv; struct archive_string_conv *sconv_default; struct archive_string_conv *sconv_utf8; int init_default_conversion; - char format_name[64]; + int process_mac_extensions; }; -#define ZIP_LENGTH_AT_END 8 -#define ZIP_ENCRYPTED (1<<0) -#define ZIP_STRONG_ENCRYPTED (1<<6) -#define ZIP_UTF8_NAME (1<<11) - -static int archive_read_format_zip_streamable_bid(struct archive_read *, - int); -static int archive_read_format_zip_seekable_bid(struct archive_read *, - int); -static int archive_read_format_zip_options(struct archive_read *, - const char *, const char *); -static int archive_read_format_zip_cleanup(struct archive_read *); -static int archive_read_format_zip_read_data(struct archive_read *, - const void **, size_t *, int64_t *); -static int archive_read_format_zip_read_data_skip(struct archive_read *a); -static int archive_read_format_zip_seekable_read_header( - struct archive_read *, struct archive_entry *); -static int archive_read_format_zip_streamable_read_header( - struct archive_read *, struct archive_entry *); -static ssize_t zip_get_local_file_header_size(struct archive_read *, size_t); -#ifdef HAVE_ZLIB_H -static int zip_deflate_init(struct archive_read *, struct zip *); -static int zip_read_data_deflate(struct archive_read *a, const void **buff, - size_t *size, int64_t *offset); -#endif -static int zip_read_data_none(struct archive_read *a, const void **buff, - size_t *size, int64_t *offset); -static int zip_read_local_file_header(struct archive_read *a, - struct archive_entry *entry, struct zip *); -static time_t zip_time(const char *); -static const char *compression_name(int compression); -static void process_extra(const char *, size_t, struct zip_entry *); - -int archive_read_support_format_zip_streamable(struct archive *); -int archive_read_support_format_zip_seekable(struct archive *); - -int -archive_read_support_format_zip_streamable(struct archive *_a) -{ - struct archive_read *a = (struct archive_read *)_a; - struct zip *zip; - int r; - - archive_check_magic(_a, ARCHIVE_READ_MAGIC, - ARCHIVE_STATE_NEW, "archive_read_support_format_zip"); - - zip = (struct zip *)malloc(sizeof(*zip)); - if (zip == NULL) { - archive_set_error(&a->archive, ENOMEM, - "Can't allocate zip data"); - return (ARCHIVE_FATAL); - } - memset(zip, 0, sizeof(*zip)); - - r = __archive_read_register_format(a, - zip, - "zip", - archive_read_format_zip_streamable_bid, - archive_read_format_zip_options, - archive_read_format_zip_streamable_read_header, - archive_read_format_zip_read_data, - archive_read_format_zip_read_data_skip, - NULL, - archive_read_format_zip_cleanup); +/* Many systems define min or MIN, but not all. */ +#define zipmin(a,b) ((a) < (b) ? (a) : (b)) - if (r != ARCHIVE_OK) - free(zip); - return (ARCHIVE_OK); -} - -int -archive_read_support_format_zip_seekable(struct archive *_a) -{ - struct archive_read *a = (struct archive_read *)_a; - struct zip *zip; - int r; - - archive_check_magic(_a, ARCHIVE_READ_MAGIC, - ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable"); - - zip = (struct zip *)malloc(sizeof(*zip)); - if (zip == NULL) { - archive_set_error(&a->archive, ENOMEM, - "Can't allocate zip data"); - return (ARCHIVE_FATAL); - } - memset(zip, 0, sizeof(*zip)); - - r = __archive_read_register_format(a, - zip, - "zip", - archive_read_format_zip_seekable_bid, - archive_read_format_zip_options, - archive_read_format_zip_seekable_read_header, - archive_read_format_zip_read_data, - archive_read_format_zip_read_data_skip, - NULL, - archive_read_format_zip_cleanup); - - if (r != ARCHIVE_OK) - free(zip); - return (ARCHIVE_OK); -} - -int -archive_read_support_format_zip(struct archive *a) -{ - int r; - r = archive_read_support_format_zip_streamable(a); - if (r != ARCHIVE_OK) - return r; - return (archive_read_support_format_zip_seekable(a)); -} +/* ------------------------------------------------------------------------ */ /* - * TODO: This is a performance sink because it forces the read core to - * drop buffered data from the start of file, which will then have to - * be re-read again if this bidder loses. + * Common code for streaming or seeking modes. * - * We workaround this a little by passing in the best bid so far so - * that later bidders can do nothing if they know they'll never - * outbid. But we can certainly do better... + * Includes code to read local file headers, decompress data + * from entry bodies, and common API. */ -static int -archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid) -{ - struct zip *zip = (struct zip *)a->format->data; - int64_t filesize; - const char *p; - - /* If someone has already bid more than 32, then avoid - trashing the look-ahead buffers with a seek. */ - if (best_bid > 32) - return (-1); - - filesize = __archive_read_seek(a, -22, SEEK_END); - /* If we can't seek, then we can't bid. */ - if (filesize <= 0) - return 0; - - /* TODO: More robust search for end of central directory record. */ - if ((p = __archive_read_ahead(a, 22, NULL)) == NULL) - return 0; - /* First four bytes are signature for end of central directory - record. Four zero bytes ensure this isn't a multi-volume - Zip file (which we don't yet support). */ - if (memcmp(p, "PK\005\006\000\000\000\000", 8) != 0) { - int64_t i, tail; - int found; - - /* - * If there is a comment in end of central directory - * record, 22 bytes are too short. we have to read more - * to properly detect the record. Hopefully, a length - * of the comment is not longer than 16362 bytes(16K-22). - */ - if (filesize + 22 > 1024 * 16) { - tail = 1024 * 16; - filesize = __archive_read_seek(a, tail * -1, SEEK_END); - } else { - tail = filesize + 22; - filesize = __archive_read_seek(a, 0, SEEK_SET); - } - if (filesize < 0) - return 0; - if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL) - return 0; - for (found = 0, i = 0;!found && i < tail - 22;) { - switch (p[i]) { - case 'P': - if (memcmp(p+i, - "PK\005\006\000\000\000\000", 8) == 0) { - p += i; - filesize += tail - - (22 + archive_le16dec(p+20)); - found = 1; - } else - i += 8; - break; - case 'K': i += 7; break; - case 005: i += 6; break; - case 006: i += 5; break; - default: i += 1; break; - } - } - if (!found) - return 0; - } - - /* Since we've already done the hard work of finding the - end of central directory record, let's save the important - information. */ - zip->central_directory_entries = archive_le16dec(p + 10); - zip->central_directory_size = archive_le32dec(p + 12); - zip->central_directory_offset = archive_le32dec(p + 16); - zip->end_of_central_directory_offset = filesize; - /* Just one volume, so central dir must all be on this volume. */ - if (zip->central_directory_entries != archive_le16dec(p + 8)) - return 0; - /* Central directory can't extend beyond end of this file. */ - if (zip->central_directory_offset + - (int64_t)zip->central_directory_size > filesize) - return 0; - - /* This is just a tiny bit higher than the maximum returned by - the streaming Zip bidder. This ensures that the more accurate - seeking Zip parser wins whenever seek is available. */ - return 32; -} - -static int -cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2) +static unsigned long +real_crc32(unsigned long crc, const void *buff, size_t len) { - const struct zip_entry *e1 = (const struct zip_entry *)n1; - const struct zip_entry *e2 = (const struct zip_entry *)n2; - - return ((int)(e2->local_header_offset - e1->local_header_offset)); -} - -static int -cmp_key(const struct archive_rb_node *n, const void *key) -{ - /* This function won't be called */ - (void)n; /* UNUSED */ - (void)key; /* UNUSED */ - return 1; + return crc32(crc, buff, len); } -static int -rsrc_cmp_node(const struct archive_rb_node *n1, - const struct archive_rb_node *n2) +static unsigned long +fake_crc32(unsigned long crc, const void *buff, size_t len) { - const struct zip_entry *e1 = (const struct zip_entry *)n1; - const struct zip_entry *e2 = (const struct zip_entry *)n2; - - return (strcmp(e2->rsrcname.s, e1->rsrcname.s)); + (void)crc; /* UNUSED */ + (void)buff; /* UNUSED */ + (void)len; /* UNUSED */ + return 0; } -static int -rsrc_cmp_key(const struct archive_rb_node *n, const void *key) -{ - const struct zip_entry *e = (const struct zip_entry *)n; - return (strcmp((const char *)key, e->rsrcname.s)); -} +static struct { + int id; + const char * name; +} compression_methods[] = { + {0, "uncompressed"}, /* The file is stored (no compression) */ + {1, "shrinking"}, /* The file is Shrunk */ + {2, "reduced-1"}, /* The file is Reduced with compression factor 1 */ + {3, "reduced-2"}, /* The file is Reduced with compression factor 2 */ + {4, "reduced-3"}, /* The file is Reduced with compression factor 3 */ + {5, "reduced-4"}, /* The file is Reduced with compression factor 4 */ + {6, "imploded"}, /* The file is Imploded */ + {7, "reserved"}, /* Reserved for Tokenizing compression algorithm */ + {8, "deflation"}, /* The file is Deflated */ + {9, "deflation-64-bit"}, /* Enhanced Deflating using Deflate64(tm) */ + {10, "ibm-terse"}, /* PKWARE Data Compression Library Imploding (old IBM TERSE) */ + {11, "reserved"}, /* Reserved by PKWARE */ + {12, "bzip"}, /* File is compressed using BZIP2 algorithm */ + {13, "reserved"}, /* Reserved by PKWARE */ + {14, "lzma"}, /* LZMA (EFS) */ + {15, "reserved"}, /* Reserved by PKWARE */ + {16, "reserved"}, /* Reserved by PKWARE */ + {17, "reserved"}, /* Reserved by PKWARE */ + {18, "ibm-terse-new"}, /* File is compressed using IBM TERSE (new) */ + {19, "ibm-lz777"}, /* IBM LZ77 z Architecture (PFS) */ + {97, "wav-pack"}, /* WavPack compressed data */ + {98, "ppmd-1"} /* PPMd version I, Rev 1 */ +}; static const char * -rsrc_basename(const char *name, size_t name_length) +compression_name(const int compression) { - const char *s, *r; - - r = s = name; - for (;;) { - s = memchr(s, '/', name_length - (s - name)); - if (s == NULL) - break; - r = ++s; - } - return (r); -} - -static void -expose_parent_dirs(struct zip *zip, const char *name, size_t name_length) -{ - struct archive_string str; - struct zip_entry *dir; - char *s; - - archive_string_init(&str); - archive_strncpy(&str, name, name_length); - for (;;) { - s = strrchr(str.s, '/'); - if (s == NULL) - break; - *s = '\0'; - /* Transfer the parent directory from zip->tree_rsrc RB - * tree to zip->tree RB tree to expose. */ - dir = (struct zip_entry *) - __archive_rb_tree_find_node(&zip->tree_rsrc, str.s); - if (dir == NULL) - break; - __archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node); - archive_string_free(&dir->rsrcname); - __archive_rb_tree_insert_node(&zip->tree, &dir->node); - } - archive_string_free(&str); -} - -static int -slurp_central_directory(struct archive_read *a, struct zip *zip) -{ - unsigned i; - int64_t correction; - static const struct archive_rb_tree_ops rb_ops = { - &cmp_node, &cmp_key - }; - static const struct archive_rb_tree_ops rb_rsrc_ops = { - &rsrc_cmp_node, &rsrc_cmp_key - }; - - /* - * Consider the archive file we are reading may be SFX. - * So we have to calculate a SFX header size to revise - * ZIP header offsets. - */ - correction = zip->end_of_central_directory_offset - - (zip->central_directory_offset + zip->central_directory_size); - /* The central directory offset is relative value, and so - * we revise this offset for SFX. */ - zip->central_directory_offset += correction; - - __archive_read_seek(a, zip->central_directory_offset, SEEK_SET); - zip->offset = zip->central_directory_offset; - __archive_rb_tree_init(&zip->tree, &rb_ops); - __archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops); - - zip->zip_entries = calloc(zip->central_directory_entries, - sizeof(struct zip_entry)); - for (i = 0; i < zip->central_directory_entries; ++i) { - struct zip_entry *zip_entry = &zip->zip_entries[i]; - size_t filename_length, extra_length, comment_length; - uint32_t external_attributes; - const char *name, *p, *r; - - if ((p = __archive_read_ahead(a, 46, NULL)) == NULL) - return ARCHIVE_FATAL; - if (memcmp(p, "PK\001\002", 4) != 0) { - archive_set_error(&a->archive, - -1, "Invalid central directory signature"); - return ARCHIVE_FATAL; + static const int num_compression_methods = sizeof(compression_methods)/sizeof(compression_methods[0]); + int i=0; + while(compression >= 0 && i++ < num_compression_methods) { + if (compression_methods[i].id == compression) { + return compression_methods[i].name; } - zip->have_central_directory = 1; - /* version = p[4]; */ - zip_entry->system = p[5]; - /* version_required = archive_le16dec(p + 6); */ - zip_entry->flags = archive_le16dec(p + 8); - zip_entry->compression = (char)archive_le16dec(p + 10); - zip_entry->mtime = zip_time(p + 12); - zip_entry->crc32 = archive_le32dec(p + 16); - zip_entry->compressed_size = archive_le32dec(p + 20); - zip_entry->uncompressed_size = archive_le32dec(p + 24); - filename_length = archive_le16dec(p + 28); - extra_length = archive_le16dec(p + 30); - comment_length = archive_le16dec(p + 32); - /* disk_start = archive_le16dec(p + 34); */ /* Better be zero. */ - /* internal_attributes = archive_le16dec(p + 36); */ /* text bit */ - external_attributes = archive_le32dec(p + 38); - zip_entry->local_header_offset = - archive_le32dec(p + 42) + correction; - - /* If we can't guess the mode, leave it zero here; - when we read the local file header we might get - more information. */ - zip_entry->mode = 0; - if (zip_entry->system == 3) { - zip_entry->mode = external_attributes >> 16; - } - - /* - * Mac resource fork files are stored under the - * "__MACOSX/" directory, so we should check if - * it is. - */ - /* Make sure we have the file name. */ - if ((p = __archive_read_ahead(a, 46 + filename_length, NULL)) - == NULL) - return ARCHIVE_FATAL; - name = p + 46; - r = rsrc_basename(name, filename_length); - if (filename_length >= 9 && - strncmp("__MACOSX/", name, 9) == 0) { - /* If this file is not a resource fork nor - * a directory. We should treat it as a non - * resource fork file to expose it. */ - if (name[filename_length-1] != '/' && - (r - name < 3 || r[0] != '.' || r[1] != '_')) { - __archive_rb_tree_insert_node(&zip->tree, - &zip_entry->node); - /* Expose its parent directories. */ - expose_parent_dirs(zip, name, filename_length); - } else { - /* This file is a resource fork file or - * a directory. */ - archive_strncpy(&(zip_entry->rsrcname), name, - filename_length); - __archive_rb_tree_insert_node(&zip->tree_rsrc, - &zip_entry->node); - } - } else { - /* Generate resource fork name to find its resource - * file at zip->tree_rsrc. */ - archive_strcpy(&(zip_entry->rsrcname), "__MACOSX/"); - archive_strncat(&(zip_entry->rsrcname), name, r - name); - archive_strcat(&(zip_entry->rsrcname), "._"); - archive_strncat(&(zip_entry->rsrcname), - name + (r - name), filename_length - (r - name)); - /* Register an entry to RB tree to sort it by - * file offset. */ - __archive_rb_tree_insert_node(&zip->tree, - &zip_entry->node); - } - - /* We don't read the filename until we get to the - local file header. Reading it here would speed up - table-of-contents operations (removing the need to - find and read local file header to get the - filename) at the cost of requiring a lot of extra - space. */ - /* We don't read the extra block here. We assume it - will be duplicated at the local file header. */ - __archive_read_consume(a, - 46 + filename_length + extra_length + comment_length); } - - return ARCHIVE_OK; + return "??"; } -static int64_t -zip_read_consume(struct archive_read *a, int64_t bytes) +/* Convert an MSDOS-style date/time into Unix-style time. */ +static time_t +zip_time(const char *p) { - struct zip *zip = (struct zip *)a->format->data; - int64_t skip; + int msTime, msDate; + struct tm ts; + + msTime = (0xff & (unsigned)p[0]) + 256 * (0xff & (unsigned)p[1]); + msDate = (0xff & (unsigned)p[2]) + 256 * (0xff & (unsigned)p[3]); - skip = __archive_read_consume(a, bytes); - if (skip > 0) - zip->offset += skip; - return (skip); + memset(&ts, 0, sizeof(ts)); + ts.tm_year = ((msDate >> 9) & 0x7f) + 80; /* Years since 1900. */ + ts.tm_mon = ((msDate >> 5) & 0x0f) - 1; /* Month number. */ + ts.tm_mday = msDate & 0x1f; /* Day of month. */ + ts.tm_hour = (msTime >> 11) & 0x1f; + ts.tm_min = (msTime >> 5) & 0x3f; + ts.tm_sec = (msTime << 1) & 0x3e; + ts.tm_isdst = -1; + return mktime(&ts); } -static int -zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry, - struct zip_entry *rsrc) +/* + * The extra data is stored as a list of + * id1+size1+data1 + id2+size2+data2 ... + * triplets. id and size are 2 bytes each. + */ +static void +process_extra(const char *p, size_t extra_length, struct zip_entry* zip_entry) { - struct zip *zip = (struct zip *)a->format->data; - unsigned char *metadata, *mp; - int64_t offset = zip->offset; - size_t remaining_bytes, metadata_bytes; - ssize_t hsize; - int ret = ARCHIVE_OK, eof; + unsigned offset = 0; - switch(rsrc->compression) { - case 0: /* No compression. */ -#ifdef HAVE_ZLIB_H - case 8: /* Deflate compression. */ + while (offset < extra_length - 4) + { + unsigned short headerid = archive_le16dec(p + offset); + unsigned short datasize = archive_le16dec(p + offset + 2); + offset += 4; + if (offset + datasize > extra_length) + break; +#ifdef DEBUG + fprintf(stderr, "Header id 0x%x, length %d\n", + headerid, datasize); #endif - break; - default: /* Unsupported compression. */ - /* Return a warning. */ - archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, - "Unsupported ZIP compression method (%s)", - compression_name(rsrc->compression)); - /* We can't decompress this entry, but we will - * be able to skip() it and try the next entry. */ - return (ARCHIVE_WARN); - } - - if (rsrc->uncompressed_size > (128 * 1024)) { - archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, - "Mac metadata is too large: %jd > 128K bytes", - (intmax_t)rsrc->uncompressed_size); - return (ARCHIVE_WARN); - } - - metadata = malloc((size_t)rsrc->uncompressed_size); - if (metadata == NULL) { - archive_set_error(&a->archive, ENOMEM, - "Can't allocate memory for Mac metadata"); - return (ARCHIVE_FATAL); - } - - if (zip->offset < rsrc->local_header_offset) - zip_read_consume(a, rsrc->local_header_offset - zip->offset); - else if (zip->offset != rsrc->local_header_offset) { - __archive_read_seek(a, rsrc->local_header_offset, SEEK_SET); - zip->offset = zip->entry->local_header_offset; - } - - hsize = zip_get_local_file_header_size(a, 0); - zip_read_consume(a, hsize); - - remaining_bytes = (size_t)rsrc->compressed_size; - metadata_bytes = (size_t)rsrc->uncompressed_size; - mp = metadata; - eof = 0; - while (!eof && remaining_bytes) { - const unsigned char *p; - ssize_t bytes_avail; - size_t bytes_used; - - p = __archive_read_ahead(a, 1, &bytes_avail); - if (p == NULL) { - archive_set_error(&a->archive, - ARCHIVE_ERRNO_FILE_FORMAT, - "Truncated ZIP file header"); - ret = ARCHIVE_WARN; - goto exit_mac_metadata; - } - if ((size_t)bytes_avail > remaining_bytes) - bytes_avail = remaining_bytes; - switch(rsrc->compression) { - case 0: /* No compression. */ - memcpy(mp, p, bytes_avail); - bytes_used = (size_t)bytes_avail; - metadata_bytes -= bytes_used; - mp += bytes_used; - if (metadata_bytes == 0) - eof = 1; + switch (headerid) { + case 0x0001: + /* Zip64 extended information extra field. */ + zip_entry->flags |= LA_USED_ZIP64; + if (zip_entry->uncompressed_size == 0xffffffff) { + if (datasize < 8) + break; + zip_entry->uncompressed_size = + archive_le64dec(p + offset); + offset += 8; + datasize -= 8; + } + if (zip_entry->compressed_size == 0xffffffff) { + if (datasize < 8) + break; + zip_entry->compressed_size = + archive_le64dec(p + offset); + offset += 8; + datasize -= 8; + } + if (zip_entry->local_header_offset == 0xffffffff) { + if (datasize < 8) + break; + zip_entry->local_header_offset = + archive_le64dec(p + offset); + offset += 8; + datasize -= 8; + } + /* archive_le32dec(p + offset) gives disk + * on which file starts, but we don't handle + * multi-volume Zip files. */ break; -#ifdef HAVE_ZLIB_H - case 8: /* Deflate compression. */ + case 0x5455: { - int r; - - ret = zip_deflate_init(a, zip); - if (ret != ARCHIVE_OK) - goto exit_mac_metadata; - zip->stream.next_in = - (Bytef *)(uintptr_t)(const void *)p; - zip->stream.avail_in = (uInt)bytes_avail; - zip->stream.total_in = 0; - zip->stream.next_out = mp; - zip->stream.avail_out = (uInt)metadata_bytes; - zip->stream.total_out = 0; - - r = inflate(&zip->stream, 0); - switch (r) { - case Z_OK: - break; - case Z_STREAM_END: - eof = 1; - break; - case Z_MEM_ERROR: - archive_set_error(&a->archive, ENOMEM, - "Out of memory for ZIP decompression"); - ret = ARCHIVE_FATAL; - goto exit_mac_metadata; - default: - archive_set_error(&a->archive, - ARCHIVE_ERRNO_MISC, - "ZIP decompression failed (%d)", r); - ret = ARCHIVE_FATAL; - goto exit_mac_metadata; + /* Extended time field "UT". */ + int flags = p[offset]; + offset++; + datasize--; + /* Flag bits indicate which dates are present. */ + if (flags & 0x01) + { +#ifdef DEBUG + fprintf(stderr, "mtime: %lld -> %d\n", + (long long)zip_entry->mtime, + archive_le32dec(p + offset)); +#endif + if (datasize < 4) + break; + zip_entry->mtime = archive_le32dec(p + offset); + offset += 4; + datasize -= 4; + } + if (flags & 0x02) + { + if (datasize < 4) + break; + zip_entry->atime = archive_le32dec(p + offset); + offset += 4; + datasize -= 4; + } + if (flags & 0x04) + { + if (datasize < 4) + break; + zip_entry->ctime = archive_le32dec(p + offset); + offset += 4; + datasize -= 4; } - bytes_used = zip->stream.total_in; - metadata_bytes -= zip->stream.total_out; - mp += zip->stream.total_out; break; } -#endif - default: - bytes_used = 0; + case 0x5855: + { + /* Info-ZIP Unix Extra Field (old version) "UX". */ + if (datasize >= 8) { + zip_entry->atime = archive_le32dec(p + offset); + zip_entry->mtime = + archive_le32dec(p + offset + 4); + } + if (datasize >= 12) { + zip_entry->uid = + archive_le16dec(p + offset + 8); + zip_entry->gid = + archive_le16dec(p + offset + 10); + } break; } - zip_read_consume(a, bytes_used); - remaining_bytes -= bytes_used; - } - archive_entry_copy_mac_metadata(entry, metadata, - (size_t)rsrc->uncompressed_size - metadata_bytes); - - __archive_read_seek(a, offset, SEEK_SET); - zip->offset = offset; -exit_mac_metadata: - zip->decompress_init = 0; - free(metadata); - return (ret); -} - -static int -archive_read_format_zip_seekable_read_header(struct archive_read *a, - struct archive_entry *entry) -{ - struct zip *zip = (struct zip *)a->format->data; - struct zip_entry *rsrc; - int r, ret = ARCHIVE_OK; - - a->archive.archive_format = ARCHIVE_FORMAT_ZIP; - if (a->archive.archive_format_name == NULL) - a->archive.archive_format_name = "ZIP"; - - if (zip->zip_entries == NULL) { - r = slurp_central_directory(a, zip); - zip->entries_remaining = zip->central_directory_entries; - if (r != ARCHIVE_OK) - return r; - /* Get first entry whose local header offset is lower than - * other entries in the archive file. */ - zip->entry = - (struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree); - } else if (zip->entry != NULL) { - /* Get next entry in local header offset order. */ - zip->entry = (struct zip_entry *)__archive_rb_tree_iterate( - &zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT); - } - - if (zip->entries_remaining <= 0 || zip->entry == NULL) - return ARCHIVE_EOF; - --zip->entries_remaining; - - if (zip->entry->rsrcname.s) - rsrc = (struct zip_entry *)__archive_rb_tree_find_node( - &zip->tree_rsrc, zip->entry->rsrcname.s); - else - rsrc = NULL; - - /* File entries are sorted by the header offset, we should mostly - * use zip_read_consume to advance a read point to avoid redundant - * data reading. */ - if (zip->offset < zip->entry->local_header_offset) - zip_read_consume(a, - zip->entry->local_header_offset - zip->offset); - else if (zip->offset != zip->entry->local_header_offset) { - __archive_read_seek(a, zip->entry->local_header_offset, - SEEK_SET); - zip->offset = zip->entry->local_header_offset; - } - zip->unconsumed = 0; - r = zip_read_local_file_header(a, entry, zip); - if (r != ARCHIVE_OK) - return r; - if ((zip->entry->mode & AE_IFMT) == AE_IFLNK) { - const void *p; - struct archive_string_conv *sconv; - size_t linkname_length = (size_t)archive_entry_size(entry); - - archive_entry_set_size(entry, 0); - p = __archive_read_ahead(a, linkname_length, NULL); - if (p == NULL) { - archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, - "Truncated Zip file"); - return ARCHIVE_FATAL; - } - - sconv = zip->sconv; - if (sconv == NULL && (zip->entry->flags & ZIP_UTF8_NAME)) - sconv = zip->sconv_utf8; - if (sconv == NULL) - sconv = zip->sconv_default; - if (archive_entry_copy_symlink_l(entry, p, linkname_length, - sconv) != 0) { - if (errno != ENOMEM && sconv == zip->sconv_utf8 && - (zip->entry->flags & ZIP_UTF8_NAME)) - archive_entry_copy_symlink_l(entry, p, - linkname_length, NULL); - if (errno == ENOMEM) { - archive_set_error(&a->archive, ENOMEM, - "Can't allocate memory for Symlink"); - return (ARCHIVE_FATAL); - } + case 0x6c65: + { + /* Experimental 'el' field */ /* - * Since there is no character-set regulation for - * symlink name, do not report the conversion error - * in an automatic conversion. + * Introduced Dec 2013 to provide a way to + * include external file attributes in local file + * header. This provides file type and permission + * information necessary to support full streaming + * extraction. Currently being discussed with + * other Zip developers... subject to change. */ - if (sconv != zip->sconv_utf8 || - (zip->entry->flags & ZIP_UTF8_NAME) == 0) { - archive_set_error(&a->archive, - ARCHIVE_ERRNO_FILE_FORMAT, - "Symlink cannot be converted " - "from %s to current locale.", - archive_string_conversion_charset_name( - sconv)); - ret = ARCHIVE_WARN; - } - } - } - if (rsrc) { - int ret2 = zip_read_mac_metadata(a, entry, rsrc); - if (ret2 < ret) - ret = ret2; - } - return (ret); -} - -static int -archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid) -{ - const char *p; - - (void)best_bid; /* UNUSED */ - - if ((p = __archive_read_ahead(a, 4, NULL)) == NULL) - return (-1); - - /* - * Bid of 30 here is: 16 bits for "PK", - * next 16-bit field has four options (-2 bits). - * 16 + 16-2 = 30. - */ - if (p[0] == 'P' && p[1] == 'K') { - if ((p[2] == '\001' && p[3] == '\002') - || (p[2] == '\003' && p[3] == '\004') - || (p[2] == '\005' && p[3] == '\006') - || (p[2] == '\007' && p[3] == '\010') - || (p[2] == '0' && p[3] == '0')) - return (30); - } - - /* TODO: It's worth looking ahead a little bit for a valid - * PK signature. In particular, that would make it possible - * to read some UUEncoded SFX files or SFX files coming from - * a network socket. */ - - return (0); -} - -static int -archive_read_format_zip_options(struct archive_read *a, - const char *key, const char *val) -{ - struct zip *zip; - int ret = ARCHIVE_FAILED; - - zip = (struct zip *)(a->format->data); - if (strcmp(key, "compat-2x") == 0) { - /* Handle filnames as libarchive 2.x */ - zip->init_default_conversion = (val != NULL) ? 1 : 0; - return (ARCHIVE_OK); - } else if (strcmp(key, "hdrcharset") == 0) { - if (val == NULL || val[0] == 0) - archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, - "zip: hdrcharset option needs a character-set name" - ); - else { - zip->sconv = archive_string_conversion_from_charset( - &a->archive, val, 0); - if (zip->sconv != NULL) { - if (strcmp(val, "UTF-8") == 0) - zip->sconv_utf8 = zip->sconv; - ret = ARCHIVE_OK; - } else - ret = ARCHIVE_FATAL; - } - return (ret); - } + int bitmap, bitmap_last; - /* Note: The "warn" return is just to inform the options - * supervisor that we didn't handle it. It will generate - * a suitable error if no one used this option. */ - return (ARCHIVE_WARN); -} - -static int -archive_read_format_zip_streamable_read_header(struct archive_read *a, - struct archive_entry *entry) -{ - struct zip *zip; - - a->archive.archive_format = ARCHIVE_FORMAT_ZIP; - if (a->archive.archive_format_name == NULL) - a->archive.archive_format_name = "ZIP"; + if (datasize < 1) + break; + bitmap_last = bitmap = 0xff & p[offset]; + offset += 1; + datasize -= 1; + + /* We only support first 7 bits of bitmap; skip rest. */ + while ((bitmap_last & 0x80) != 0 + && datasize >= 1) { + bitmap_last = p[offset]; + offset += 1; + datasize -= 1; + } - zip = (struct zip *)(a->format->data); + if (bitmap & 1) { + // 2 byte "version made by" + if (datasize < 2) + break; + zip_entry->system + = archive_le16dec(p + offset) >> 8; + offset += 2; + datasize -= 2; + } + if (bitmap & 2) { + // 2 byte "internal file attributes" + uint32_t internal_attributes; + if (datasize < 2) + break; + internal_attributes + = archive_le16dec(p + offset); + // Not used by libarchive at present. + (void)internal_attributes; /* UNUSED */ + offset += 2; + datasize -= 2; + } + if (bitmap & 4) { + // 4 byte "external file attributes" + uint32_t external_attributes; + if (datasize < 4) + break; + external_attributes + = archive_le32dec(p + offset); + if (zip_entry->system == 3) { + zip_entry->mode + = external_attributes >> 16; + } + offset += 4; + datasize -= 4; + } + if (bitmap & 8) { + // 2 byte comment length + comment + uint32_t comment_length; + if (datasize < 2) + break; + comment_length + = archive_le16dec(p + offset); + offset += 2; + datasize -= 2; - /* Make sure we have a zip_entry structure to use. */ - if (zip->zip_entries == NULL) { - zip->zip_entries = malloc(sizeof(struct zip_entry)); - if (zip->zip_entries == NULL) { - archive_set_error(&a->archive, ENOMEM, - "Out of memory"); - return ARCHIVE_FATAL; + if (datasize < comment_length) + break; + // Comment is not supported by libarchive + offset += comment_length; + datasize -= comment_length; + } + break; } - } - zip->entry = zip->zip_entries; - memset(zip->entry, 0, sizeof(struct zip_entry)); - - /* Search ahead for the next local file header. */ - zip_read_consume(a, zip->unconsumed); - zip->unconsumed = 0; - for (;;) { - int64_t skipped = 0; - const char *p, *end; - ssize_t bytes; - - p = __archive_read_ahead(a, 4, &bytes); - if (p == NULL) - return (ARCHIVE_FATAL); - end = p + bytes; - - while (p + 4 <= end) { - if (p[0] == 'P' && p[1] == 'K') { - if (p[2] == '\001' && p[3] == '\002') - /* Beginning of central directory. */ - return (ARCHIVE_EOF); + case 0x7855: + /* Info-ZIP Unix Extra Field (type 2) "Ux". */ +#ifdef DEBUG + fprintf(stderr, "uid %d gid %d\n", + archive_le16dec(p + offset), + archive_le16dec(p + offset + 2)); +#endif + if (datasize >= 2) + zip_entry->uid = archive_le16dec(p + offset); + if (datasize >= 4) + zip_entry->gid = + archive_le16dec(p + offset + 2); + break; + case 0x7875: + { + /* Info-Zip Unix Extra Field (type 3) "ux". */ + int uidsize = 0, gidsize = 0; - if (p[2] == '\003' && p[3] == '\004') { - /* Regular file entry. */ - zip_read_consume(a, skipped); - return zip_read_local_file_header(a, - entry, zip); + /* TODO: support arbitrary uidsize/gidsize. */ + if (datasize >= 1 && p[offset] == 1) {/* version=1 */ + if (datasize >= 4) { + /* get a uid size. */ + uidsize = p[offset+1]; + if (uidsize == 2) + zip_entry->uid = + archive_le16dec( + p + offset + 2); + else if (uidsize == 4 && datasize >= 6) + zip_entry->uid = + archive_le32dec( + p + offset + 2); + } + if (datasize >= (2 + uidsize + 3)) { + /* get a gid size. */ + gidsize = p[offset+2+uidsize]; + if (gidsize == 2) + zip_entry->gid = + archive_le16dec( + p+offset+2+uidsize+1); + else if (gidsize == 4 && + datasize >= (2 + uidsize + 5)) + zip_entry->gid = + archive_le32dec( + p+offset+2+uidsize+1); } - - if (p[2] == '\005' && p[3] == '\006') - /* End of central directory. */ - return (ARCHIVE_EOF); } - ++p; - ++skipped; + break; } - zip_read_consume(a, skipped); - } -} - -static ssize_t -zip_get_local_file_header_size(struct archive_read *a, size_t extra) -{ - const char *p; - ssize_t filename_length, extra_length; - - if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) { - archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, - "Truncated ZIP file header"); - return (ARCHIVE_WARN); + default: + break; + } + offset += datasize; } - p += extra; - - if (memcmp(p, "PK\003\004", 4) != 0) { - archive_set_error(&a->archive, -1, "Damaged Zip archive"); - return ARCHIVE_WARN; +#ifdef DEBUG + if (offset != extra_length) + { + fprintf(stderr, + "Extra data field contents do not match reported size!\n"); } - filename_length = archive_le16dec(p + 26); - extra_length = archive_le16dec(p + 28); - - return (30 + filename_length + extra_length); +#endif } /* @@ -957,16 +496,18 @@ zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry, size_t len, filename_length, extra_length; struct archive_string_conv *sconv; struct zip_entry *zip_entry = zip->entry; - uint32_t local_crc32; - int64_t compressed_size, uncompressed_size; + struct zip_entry zip_entry_central_dir; int ret = ARCHIVE_OK; char version; + /* Save a copy of the original for consistency checks. */ + zip_entry_central_dir = *zip_entry; + zip->decompress_init = 0; zip->end_of_entry = 0; zip->entry_uncompressed_bytes_read = 0; zip->entry_compressed_bytes_read = 0; - zip->entry_crc32 = crc32(0, NULL, 0); + zip->entry_crc32 = zip->crc32func(0, NULL, 0); /* Setup default conversion. */ if (zip->sconv == NULL && !zip->init_default_conversion) { @@ -987,52 +528,26 @@ zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry, } version = p[4]; zip_entry->system = p[5]; - zip_entry->flags = archive_le16dec(p + 6); + zip_entry->zip_flags = archive_le16dec(p + 6); + if (zip_entry->zip_flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)) { + zip->has_encrypted_entries = 1; + archive_entry_set_is_data_encrypted(entry, 1); + if (zip_entry->zip_flags & ZIP_CENTRAL_DIRECTORY_ENCRYPTED && + zip_entry->zip_flags & ZIP_ENCRYPTED && + zip_entry->zip_flags & ZIP_STRONG_ENCRYPTED) { + archive_entry_set_is_metadata_encrypted(entry, 1); + return ARCHIVE_FATAL; + } + } zip_entry->compression = (char)archive_le16dec(p + 8); zip_entry->mtime = zip_time(p + 10); - local_crc32 = archive_le32dec(p + 14); - compressed_size = archive_le32dec(p + 18); - uncompressed_size = archive_le32dec(p + 22); + zip_entry->crc32 = archive_le32dec(p + 14); + zip_entry->compressed_size = archive_le32dec(p + 18); + zip_entry->uncompressed_size = archive_le32dec(p + 22); filename_length = archive_le16dec(p + 26); extra_length = archive_le16dec(p + 28); - zip_read_consume(a, 30); - - if (zip->have_central_directory) { - /* If we read the central dir entry, we must have size - * information as well, so ignore the length-at-end flag. */ - zip_entry->flags &= ~ZIP_LENGTH_AT_END; - /* If we have values from both the local file header - and the central directory, warn about mismatches - which might indicate a damaged file. But some - writers always put zero in the local header; don't - bother warning about that. */ - if (local_crc32 != 0 && local_crc32 != zip_entry->crc32) { - archive_set_error(&a->archive, - ARCHIVE_ERRNO_FILE_FORMAT, - "Inconsistent CRC32 values"); - ret = ARCHIVE_WARN; - } - if (compressed_size != 0 - && compressed_size != zip_entry->compressed_size) { - archive_set_error(&a->archive, - ARCHIVE_ERRNO_FILE_FORMAT, - "Inconsistent compressed size"); - ret = ARCHIVE_WARN; - } - if (uncompressed_size != 0 - && uncompressed_size != zip_entry->uncompressed_size) { - archive_set_error(&a->archive, - ARCHIVE_ERRNO_FILE_FORMAT, - "Inconsistent uncompressed size"); - ret = ARCHIVE_WARN; - } - } else { - /* If we don't have the CD info, use whatever we do have. */ - zip_entry->crc32 = local_crc32; - zip_entry->compressed_size = compressed_size; - zip_entry->uncompressed_size = uncompressed_size; - } + __archive_read_consume(a, 30); /* Read the filename. */ if ((h = __archive_read_ahead(a, filename_length, NULL)) == NULL) { @@ -1040,7 +555,7 @@ zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry, "Truncated ZIP file header"); return (ARCHIVE_FATAL); } - if (zip_entry->flags & ZIP_UTF8_NAME) { + if (zip_entry->zip_flags & ZIP_UTF8_NAME) { /* The filename is stored to be UTF-8. */ if (zip->sconv_utf8 == NULL) { zip->sconv_utf8 = @@ -1069,26 +584,38 @@ zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry, archive_string_conversion_charset_name(sconv)); ret = ARCHIVE_WARN; } - zip_read_consume(a, filename_length); + __archive_read_consume(a, filename_length); - if (zip_entry->mode == 0) { + /* Work around a bug in Info-Zip: When reading from a pipe, it + * stats the pipe instead of synthesizing a file entry. */ + if ((zip_entry->mode & AE_IFMT) == AE_IFIFO) { + zip_entry->mode &= ~ AE_IFMT; + zip_entry->mode |= AE_IFREG; + } + + if ((zip_entry->mode & AE_IFMT) == 0) { /* Especially in streaming mode, we can end up - here without having seen any mode information. + here without having seen proper mode information. Guess from the filename. */ wp = archive_entry_pathname_w(entry); if (wp != NULL) { len = wcslen(wp); if (len > 0 && wp[len - 1] == L'/') - zip_entry->mode = AE_IFDIR | 0777; + zip_entry->mode |= AE_IFDIR; else - zip_entry->mode = AE_IFREG | 0666; + zip_entry->mode |= AE_IFREG; } else { cp = archive_entry_pathname(entry); len = (cp != NULL)?strlen(cp):0; if (len > 0 && cp[len - 1] == '/') - zip_entry->mode = AE_IFDIR | 0777; + zip_entry->mode |= AE_IFDIR; else - zip_entry->mode = AE_IFREG | 0666; + zip_entry->mode |= AE_IFREG; + } + if (zip_entry->mode == AE_IFDIR) { + zip_entry->mode |= 0775; + } else if (zip_entry->mode == AE_IFREG) { + zip_entry->mode |= 0664; } } @@ -1098,8 +625,53 @@ zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry, "Truncated ZIP file header"); return (ARCHIVE_FATAL); } + process_extra(h, extra_length, zip_entry); - zip_read_consume(a, extra_length); + __archive_read_consume(a, extra_length); + + if (zip_entry->flags & LA_FROM_CENTRAL_DIRECTORY) { + /* If this came from the central dir, it's size info + * is definitive, so ignore the length-at-end flag. */ + zip_entry->zip_flags &= ~ZIP_LENGTH_AT_END; + /* If local header is missing a value, use the one from + the central directory. If both have it, warn about + mismatches. */ + if (zip_entry->crc32 == 0) { + zip_entry->crc32 = zip_entry_central_dir.crc32; + } else if (!zip->ignore_crc32 + && zip_entry->crc32 != zip_entry_central_dir.crc32) { + archive_set_error(&a->archive, + ARCHIVE_ERRNO_FILE_FORMAT, + "Inconsistent CRC32 values"); + ret = ARCHIVE_WARN; + } + if (zip_entry->compressed_size == 0) { + zip_entry->compressed_size + = zip_entry_central_dir.compressed_size; + } else if (zip_entry->compressed_size + != zip_entry_central_dir.compressed_size) { + archive_set_error(&a->archive, + ARCHIVE_ERRNO_FILE_FORMAT, + "Inconsistent compressed size: " + "%jd in central directory, %jd in local header", + (intmax_t)zip_entry_central_dir.compressed_size, + (intmax_t)zip_entry->compressed_size); + ret = ARCHIVE_WARN; + } + if (zip_entry->uncompressed_size == 0) { + zip_entry->uncompressed_size + = zip_entry_central_dir.uncompressed_size; + } else if (zip_entry->uncompressed_size + != zip_entry_central_dir.uncompressed_size) { + archive_set_error(&a->archive, + ARCHIVE_ERRNO_FILE_FORMAT, + "Inconsistent uncompressed size: " + "%jd in central directory, %jd in local header", + (intmax_t)zip_entry_central_dir.uncompressed_size, + (intmax_t)zip_entry->uncompressed_size); + ret = ARCHIVE_WARN; + } + } /* Populate some additional entry fields: */ archive_entry_set_mode(entry, zip_entry->mode); @@ -1108,14 +680,65 @@ zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry, archive_entry_set_mtime(entry, zip_entry->mtime, 0); archive_entry_set_ctime(entry, zip_entry->ctime, 0); archive_entry_set_atime(entry, zip_entry->atime, 0); - /* Set the size only if it's meaningful. */ - if (0 == (zip_entry->flags & ZIP_LENGTH_AT_END)) - archive_entry_set_size(entry, zip_entry->uncompressed_size); + if ((zip->entry->mode & AE_IFMT) == AE_IFLNK) { + size_t linkname_length = zip_entry->compressed_size; + + archive_entry_set_size(entry, 0); + p = __archive_read_ahead(a, linkname_length, NULL); + if (p == NULL) { + archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, + "Truncated Zip file"); + return ARCHIVE_FATAL; + } + if (__archive_read_consume(a, linkname_length) < 0) { + archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, + "Read error skipping symlink target name"); + return ARCHIVE_FATAL; + } + + sconv = zip->sconv; + if (sconv == NULL && (zip->entry->zip_flags & ZIP_UTF8_NAME)) + sconv = zip->sconv_utf8; + if (sconv == NULL) + sconv = zip->sconv_default; + if (archive_entry_copy_symlink_l(entry, p, linkname_length, + sconv) != 0) { + if (errno != ENOMEM && sconv == zip->sconv_utf8 && + (zip->entry->zip_flags & ZIP_UTF8_NAME)) + archive_entry_copy_symlink_l(entry, p, + linkname_length, NULL); + if (errno == ENOMEM) { + archive_set_error(&a->archive, ENOMEM, + "Can't allocate memory for Symlink"); + return (ARCHIVE_FATAL); + } + /* + * Since there is no character-set regulation for + * symlink name, do not report the conversion error + * in an automatic conversion. + */ + if (sconv != zip->sconv_utf8 || + (zip->entry->zip_flags & ZIP_UTF8_NAME) == 0) { + archive_set_error(&a->archive, + ARCHIVE_ERRNO_FILE_FORMAT, + "Symlink cannot be converted " + "from %s to current locale.", + archive_string_conversion_charset_name( + sconv)); + ret = ARCHIVE_WARN; + } + } + zip_entry->uncompressed_size = zip_entry->compressed_size = 0; + } else if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END) + || zip_entry->uncompressed_size > 0) { + /* Set the size only if it's meaningful. */ + archive_entry_set_size(entry, zip_entry->uncompressed_size); + } zip->entry_bytes_remaining = zip_entry->compressed_size; /* If there's no body, force read_data() to return EOF immediately. */ - if (0 == (zip_entry->flags & ZIP_LENGTH_AT_END) + if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END) && zip->entry_bytes_remaining < 1) zip->end_of_entry = 1; @@ -1128,138 +751,6 @@ zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry, return (ret); } -static const char * -compression_name(int compression) -{ - static const char *compression_names[] = { - "uncompressed", - "shrinking", - "reduced-1", - "reduced-2", - "reduced-3", - "reduced-4", - "imploded", - "reserved", - "deflation" - }; - - if (0 <= compression && compression < - (int)(sizeof(compression_names)/sizeof(compression_names[0]))) - return compression_names[compression]; - else - return "??"; -} - -/* Convert an MSDOS-style date/time into Unix-style time. */ -static time_t -zip_time(const char *p) -{ - int msTime, msDate; - struct tm ts; - - msTime = (0xff & (unsigned)p[0]) + 256 * (0xff & (unsigned)p[1]); - msDate = (0xff & (unsigned)p[2]) + 256 * (0xff & (unsigned)p[3]); - - memset(&ts, 0, sizeof(ts)); - ts.tm_year = ((msDate >> 9) & 0x7f) + 80; /* Years since 1900. */ - ts.tm_mon = ((msDate >> 5) & 0x0f) - 1; /* Month number. */ - ts.tm_mday = msDate & 0x1f; /* Day of month. */ - ts.tm_hour = (msTime >> 11) & 0x1f; - ts.tm_min = (msTime >> 5) & 0x3f; - ts.tm_sec = (msTime << 1) & 0x3e; - ts.tm_isdst = -1; - return mktime(&ts); -} - -static int -archive_read_format_zip_read_data(struct archive_read *a, - const void **buff, size_t *size, int64_t *offset) -{ - int r; - struct zip *zip = (struct zip *)(a->format->data); - - *offset = zip->entry_uncompressed_bytes_read; - *size = 0; - *buff = NULL; - - /* If we hit end-of-entry last time, return ARCHIVE_EOF. */ - if (zip->end_of_entry) - return (ARCHIVE_EOF); - - /* Return EOF immediately if this is a non-regular file. */ - if (AE_IFREG != (zip->entry->mode & AE_IFMT)) - return (ARCHIVE_EOF); - - if (zip->entry->flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)) { - archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, - "Encrypted file is unsupported"); - return (ARCHIVE_FAILED); - } - - zip_read_consume(a, zip->unconsumed); - zip->unconsumed = 0; - - switch(zip->entry->compression) { - case 0: /* No compression. */ - r = zip_read_data_none(a, buff, size, offset); - break; -#ifdef HAVE_ZLIB_H - case 8: /* Deflate compression. */ - r = zip_read_data_deflate(a, buff, size, offset); - break; -#endif - default: /* Unsupported compression. */ - /* Return a warning. */ - archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, - "Unsupported ZIP compression method (%s)", - compression_name(zip->entry->compression)); - /* We can't decompress this entry, but we will - * be able to skip() it and try the next entry. */ - return (ARCHIVE_FAILED); - break; - } - if (r != ARCHIVE_OK) - return (r); - /* Update checksum */ - if (*size) - zip->entry_crc32 = crc32(zip->entry_crc32, *buff, - (unsigned)*size); - /* If we hit the end, swallow any end-of-data marker. */ - if (zip->end_of_entry) { - /* Check file size, CRC against these values. */ - if (zip->entry->compressed_size != - zip->entry_compressed_bytes_read) { - archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, - "ZIP compressed data is wrong size " - "(read %jd, expected %jd)", - (intmax_t)zip->entry_compressed_bytes_read, - (intmax_t)zip->entry->compressed_size); - return (ARCHIVE_WARN); - } - /* Size field only stores the lower 32 bits of the actual - * size. */ - if ((zip->entry->uncompressed_size & UINT32_MAX) - != (zip->entry_uncompressed_bytes_read & UINT32_MAX)) { - archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, - "ZIP uncompressed data is wrong size " - "(read %jd, expected %jd)", - (intmax_t)zip->entry_uncompressed_bytes_read, - (intmax_t)zip->entry->uncompressed_size); - return (ARCHIVE_WARN); - } - /* Check computed CRC against header */ - if (zip->entry->crc32 != zip->entry_crc32) { - archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, - "ZIP bad CRC: 0x%lx should be 0x%lx", - (unsigned long)zip->entry_crc32, - (unsigned long)zip->entry->crc32); - return (ARCHIVE_WARN); - } - } - - return (ARCHIVE_OK); -} - /* * Read "uncompressed" data. There are three cases: * 1) We know the size of the data. This is always true for the @@ -1276,9 +767,10 @@ archive_read_format_zip_read_data(struct archive_read *a, * TODO: Technically, the PK\007\010 signature is optional. * In the original spec, the data descriptor contained CRC * and size fields but had no leading signature. In practice, - * newer writers seem to provide the signature pretty consistently, - * but we might need to do something more complex here if - * we want to handle older archives that lack that signature. + * newer writers seem to provide the signature pretty consistently. + * + * For uncompressed data, the PK\007\010 marker seems essential + * to be sure we've actually seen the end of the entry. * * Returns ARCHIVE_OK if successful, ARCHIVE_FATAL otherwise, sets * zip->end_of_entry if it consumes all of the data. @@ -1295,35 +787,40 @@ zip_read_data_none(struct archive_read *a, const void **_buff, zip = (struct zip *)(a->format->data); - if (zip->entry->flags & ZIP_LENGTH_AT_END) { + if (zip->entry->zip_flags & ZIP_LENGTH_AT_END) { const char *p; - /* Grab at least 16 bytes. */ - buff = __archive_read_ahead(a, 16, &bytes_avail); - if (bytes_avail < 16) { + /* Grab at least 24 bytes. */ + buff = __archive_read_ahead(a, 24, &bytes_avail); + if (bytes_avail < 24) { /* Zip archives have end-of-archive markers that are longer than this, so a failure to get at - least 16 bytes really does indicate a truncated + least 24 bytes really does indicate a truncated file. */ archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Truncated ZIP file data"); return (ARCHIVE_FATAL); } - /* Check for a complete PK\007\010 signature. */ + /* Check for a complete PK\007\010 signature, followed + * by the correct 4-byte CRC. */ p = buff; - if (p[0] == 'P' && p[1] == 'K' + if (p[0] == 'P' && p[1] == 'K' && p[2] == '\007' && p[3] == '\010' - && archive_le32dec(p + 4) == zip->entry_crc32 - && archive_le32dec(p + 8) == - zip->entry_compressed_bytes_read - && archive_le32dec(p + 12) == - zip->entry_uncompressed_bytes_read) { - zip->entry->crc32 = archive_le32dec(p + 4); - zip->entry->compressed_size = archive_le32dec(p + 8); - zip->entry->uncompressed_size = archive_le32dec(p + 12); + && (archive_le32dec(p + 4) == zip->entry_crc32 + || zip->ignore_crc32)) { + if (zip->entry->flags & LA_USED_ZIP64) { + zip->entry->crc32 = archive_le32dec(p + 4); + zip->entry->compressed_size = archive_le64dec(p + 8); + zip->entry->uncompressed_size = archive_le64dec(p + 16); + zip->unconsumed = 24; + } else { + zip->entry->crc32 = archive_le32dec(p + 4); + zip->entry->compressed_size = archive_le32dec(p + 8); + zip->entry->uncompressed_size = archive_le32dec(p + 12); + zip->unconsumed = 16; + } zip->end_of_entry = 1; - zip->unconsumed = 16; return (ARCHIVE_OK); } /* If not at EOF, ensure we consume at least one byte. */ @@ -1430,7 +927,7 @@ zip_read_data_deflate(struct archive_read *a, const void **buff, * decompressor to combine reads by copying data. */ compressed_buff = __archive_read_ahead(a, 1, &bytes_avail); - if (0 == (zip->entry->flags & ZIP_LENGTH_AT_END) + if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) && bytes_avail > zip->entry_bytes_remaining) { bytes_avail = (ssize_t)zip->entry_bytes_remaining; } @@ -1472,7 +969,7 @@ zip_read_data_deflate(struct archive_read *a, const void **buff, /* Consume as much as the compressor actually used. */ bytes_avail = zip->stream.total_in; - zip_read_consume(a, bytes_avail); + __archive_read_consume(a, bytes_avail); zip->entry_bytes_remaining -= bytes_avail; zip->entry_compressed_bytes_read += bytes_avail; @@ -1480,10 +977,10 @@ zip_read_data_deflate(struct archive_read *a, const void **buff, zip->entry_uncompressed_bytes_read += zip->stream.total_out; *buff = zip->uncompressed_buffer; - if (zip->end_of_entry && (zip->entry->flags & ZIP_LENGTH_AT_END)) { + if (zip->end_of_entry && (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) { const char *p; - if (NULL == (p = __archive_read_ahead(a, 16, NULL))) { + if (NULL == (p = __archive_read_ahead(a, 24, NULL))) { archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Truncated ZIP end-of-file record"); @@ -1492,36 +989,378 @@ zip_read_data_deflate(struct archive_read *a, const void **buff, /* Consume the optional PK\007\010 marker. */ if (p[0] == 'P' && p[1] == 'K' && p[2] == '\007' && p[3] == '\010') { - zip->entry->crc32 = archive_le32dec(p + 4); - zip->entry->compressed_size = archive_le32dec(p + 8); - zip->entry->uncompressed_size = archive_le32dec(p + 12); - zip->unconsumed = 16; + p += 4; + zip->unconsumed = 4; + } + if (zip->entry->flags & LA_USED_ZIP64) { + zip->entry->crc32 = archive_le32dec(p); + zip->entry->compressed_size = archive_le64dec(p + 4); + zip->entry->uncompressed_size = archive_le64dec(p + 12); + zip->unconsumed += 20; + } else { + zip->entry->crc32 = archive_le32dec(p); + zip->entry->compressed_size = archive_le32dec(p + 4); + zip->entry->uncompressed_size = archive_le32dec(p + 8); + zip->unconsumed += 12; + } + } + + return (ARCHIVE_OK); +} +#endif + +static int +archive_read_format_zip_read_data(struct archive_read *a, + const void **buff, size_t *size, int64_t *offset) +{ + int r; + struct zip *zip = (struct zip *)(a->format->data); + + if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { + zip->has_encrypted_entries = 0; + } + + *offset = zip->entry_uncompressed_bytes_read; + *size = 0; + *buff = NULL; + + /* If we hit end-of-entry last time, return ARCHIVE_EOF. */ + if (zip->end_of_entry) + return (ARCHIVE_EOF); + + /* Return EOF immediately if this is a non-regular file. */ + if (AE_IFREG != (zip->entry->mode & AE_IFMT)) + return (ARCHIVE_EOF); + + if (zip->entry->zip_flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)) { + zip->has_encrypted_entries = 1; + archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, + "Encrypted file is unsupported"); + return (ARCHIVE_FAILED); + } + + __archive_read_consume(a, zip->unconsumed); + zip->unconsumed = 0; + + switch(zip->entry->compression) { + case 0: /* No compression. */ + r = zip_read_data_none(a, buff, size, offset); + break; +#ifdef HAVE_ZLIB_H + case 8: /* Deflate compression. */ + r = zip_read_data_deflate(a, buff, size, offset); + break; +#endif + default: /* Unsupported compression. */ + /* Return a warning. */ + archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, + "Unsupported ZIP compression method (%s)", + compression_name(zip->entry->compression)); + /* We can't decompress this entry, but we will + * be able to skip() it and try the next entry. */ + return (ARCHIVE_FAILED); + break; + } + if (r != ARCHIVE_OK) + return (r); + /* Update checksum */ + if (*size) + zip->entry_crc32 = zip->crc32func(zip->entry_crc32, *buff, + (unsigned)*size); + /* If we hit the end, swallow any end-of-data marker. */ + if (zip->end_of_entry) { + /* Check file size, CRC against these values. */ + if (zip->entry->compressed_size != + zip->entry_compressed_bytes_read) { + archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, + "ZIP compressed data is wrong size " + "(read %jd, expected %jd)", + (intmax_t)zip->entry_compressed_bytes_read, + (intmax_t)zip->entry->compressed_size); + return (ARCHIVE_WARN); + } + /* Size field only stores the lower 32 bits of the actual + * size. */ + if ((zip->entry->uncompressed_size & UINT32_MAX) + != (zip->entry_uncompressed_bytes_read & UINT32_MAX)) { + archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, + "ZIP uncompressed data is wrong size " + "(read %jd, expected %jd)\n", + (intmax_t)zip->entry_uncompressed_bytes_read, + (intmax_t)zip->entry->uncompressed_size); + return (ARCHIVE_WARN); + } + /* Check computed CRC against header */ + if (zip->entry->crc32 != zip->entry_crc32 + && !zip->ignore_crc32) { + archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, + "ZIP bad CRC: 0x%lx should be 0x%lx", + (unsigned long)zip->entry_crc32, + (unsigned long)zip->entry->crc32); + return (ARCHIVE_WARN); } } return (ARCHIVE_OK); } + +static int +archive_read_format_zip_cleanup(struct archive_read *a) +{ + struct zip *zip; + struct zip_entry *zip_entry, *next_zip_entry; + + zip = (struct zip *)(a->format->data); +#ifdef HAVE_ZLIB_H + if (zip->stream_valid) + inflateEnd(&zip->stream); + free(zip->uncompressed_buffer); #endif + if (zip->zip_entries) { + zip_entry = zip->zip_entries; + while (zip_entry != NULL) { + next_zip_entry = zip_entry->next; + archive_string_free(&zip_entry->rsrcname); + free(zip_entry); + zip_entry = next_zip_entry; + } + } + free(zip); + (a->format->data) = NULL; + return (ARCHIVE_OK); +} + +static int +archive_read_format_zip_has_encrypted_entries(struct archive_read *_a) +{ + if (_a && _a->format) { + struct zip * zip = (struct zip *)_a->format->data; + if (zip) { + return zip->has_encrypted_entries; + } + } + return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; +} static int -archive_read_format_zip_read_data_skip(struct archive_read *a) +archive_read_format_zip_options(struct archive_read *a, + const char *key, const char *val) { struct zip *zip; + int ret = ARCHIVE_FAILED; zip = (struct zip *)(a->format->data); + if (strcmp(key, "compat-2x") == 0) { + /* Handle filenames as libarchive 2.x */ + zip->init_default_conversion = (val != NULL) ? 1 : 0; + return (ARCHIVE_OK); + } else if (strcmp(key, "hdrcharset") == 0) { + if (val == NULL || val[0] == 0) + archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, + "zip: hdrcharset option needs a character-set name" + ); + else { + zip->sconv = archive_string_conversion_from_charset( + &a->archive, val, 0); + if (zip->sconv != NULL) { + if (strcmp(val, "UTF-8") == 0) + zip->sconv_utf8 = zip->sconv; + ret = ARCHIVE_OK; + } else + ret = ARCHIVE_FATAL; + } + return (ret); + } else if (strcmp(key, "ignorecrc32") == 0) { + /* Mostly useful for testing. */ + if (val == NULL || val[0] == 0) { + zip->crc32func = real_crc32; + zip->ignore_crc32 = 0; + } else { + zip->crc32func = fake_crc32; + zip->ignore_crc32 = 1; + } + return (ARCHIVE_OK); + } else if (strcmp(key, "mac-ext") == 0) { + zip->process_mac_extensions = (val != NULL && val[0] != 0); + return (ARCHIVE_OK); + } + + /* Note: The "warn" return is just to inform the options + * supervisor that we didn't handle it. It will generate + * a suitable error if no one used this option. */ + return (ARCHIVE_WARN); +} + +int +archive_read_support_format_zip(struct archive *a) +{ + int r; + r = archive_read_support_format_zip_streamable(a); + if (r != ARCHIVE_OK) + return r; + return (archive_read_support_format_zip_seekable(a)); +} + +/* ------------------------------------------------------------------------ */ + +/* + * Streaming-mode support + */ + + +static int +archive_read_support_format_zip_capabilities_streamable(struct archive_read * a) +{ + (void)a; /* UNUSED */ + return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA | ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA); +} + +static int +archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid) +{ + const char *p; + + (void)best_bid; /* UNUSED */ + + if ((p = __archive_read_ahead(a, 4, NULL)) == NULL) + return (-1); + + /* + * Bid of 29 here comes from: + * + 16 bits for "PK", + * + next 16-bit field has 6 options so contributes + * about 16 - log_2(6) ~= 16 - 2.6 ~= 13 bits + * + * So we've effectively verified ~29 total bits of check data. + */ + if (p[0] == 'P' && p[1] == 'K') { + if ((p[2] == '\001' && p[3] == '\002') + || (p[2] == '\003' && p[3] == '\004') + || (p[2] == '\005' && p[3] == '\006') + || (p[2] == '\006' && p[3] == '\006') + || (p[2] == '\007' && p[3] == '\010') + || (p[2] == '0' && p[3] == '0')) + return (29); + } + + /* TODO: It's worth looking ahead a little bit for a valid + * PK signature. In particular, that would make it possible + * to read some UUEncoded SFX files or SFX files coming from + * a network socket. */ + + return (0); +} + +static int +archive_read_format_zip_streamable_read_header(struct archive_read *a, + struct archive_entry *entry) +{ + struct zip *zip; + + a->archive.archive_format = ARCHIVE_FORMAT_ZIP; + if (a->archive.archive_format_name == NULL) + a->archive.archive_format_name = "ZIP"; + + zip = (struct zip *)(a->format->data); + + /* + * It should be sufficient to call archive_read_next_header() for + * a reader to determine if an entry is encrypted or not. If the + * encryption of an entry is only detectable when calling + * archive_read_data(), so be it. We'll do the same check there + * as well. + */ + if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { + zip->has_encrypted_entries = 0; + } + + /* Make sure we have a zip_entry structure to use. */ + if (zip->zip_entries == NULL) { + zip->zip_entries = malloc(sizeof(struct zip_entry)); + if (zip->zip_entries == NULL) { + archive_set_error(&a->archive, ENOMEM, + "Out of memory"); + return ARCHIVE_FATAL; + } + } + zip->entry = zip->zip_entries; + memset(zip->entry, 0, sizeof(struct zip_entry)); + + /* Search ahead for the next local file header. */ + __archive_read_consume(a, zip->unconsumed); + zip->unconsumed = 0; + for (;;) { + int64_t skipped = 0; + const char *p, *end; + ssize_t bytes; + + p = __archive_read_ahead(a, 4, &bytes); + if (p == NULL) + return (ARCHIVE_FATAL); + end = p + bytes; + + while (p + 4 <= end) { + if (p[0] == 'P' && p[1] == 'K') { + if (p[2] == '\003' && p[3] == '\004') { + /* Regular file entry. */ + __archive_read_consume(a, skipped); + return zip_read_local_file_header(a, + entry, zip); + } + + /* + * TODO: We cannot restore permissions + * based only on the local file headers. + * Consider scanning the central + * directory and returning additional + * entries for at least directories. + * This would allow us to properly set + * directory permissions. + * + * This won't help us fix symlinks + * and may not help with regular file + * permissions, either. <sigh> + */ + if (p[2] == '\001' && p[3] == '\002') { + return (ARCHIVE_EOF); + } + + /* End of central directory? Must be an + * empty archive. */ + if ((p[2] == '\005' && p[3] == '\006') + || (p[2] == '\006' && p[3] == '\006')) + return (ARCHIVE_EOF); + } + ++p; + ++skipped; + } + __archive_read_consume(a, skipped); + } +} + +static int +archive_read_format_zip_read_data_skip_streamable(struct archive_read *a) +{ + struct zip *zip; + int64_t bytes_skipped; + + zip = (struct zip *)(a->format->data); + bytes_skipped = __archive_read_consume(a, zip->unconsumed); + zip->unconsumed = 0; + if (bytes_skipped < 0) + return (ARCHIVE_FATAL); /* If we've already read to end of data, we're done. */ if (zip->end_of_entry) return (ARCHIVE_OK); /* So we know we're streaming... */ - if (0 == (zip->entry->flags & ZIP_LENGTH_AT_END)) { + if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) + || zip->entry->compressed_size > 0) { /* We know the compressed length, so we can just skip. */ - int64_t bytes_skipped = zip_read_consume(a, - zip->entry_bytes_remaining + zip->unconsumed); + bytes_skipped = __archive_read_consume(a, zip->entry_bytes_remaining); if (bytes_skipped < 0) return (ARCHIVE_FATAL); - zip->unconsumed = 0; return (ARCHIVE_OK); } @@ -1544,8 +1383,6 @@ archive_read_format_zip_read_data_skip(struct archive_read *a) #endif default: /* Uncompressed or unknown. */ /* Scan for a PK\007\010 signature. */ - zip_read_consume(a, zip->unconsumed); - zip->unconsumed = 0; for (;;) { const char *p, *buff; ssize_t bytes_avail; @@ -1563,180 +1400,772 @@ archive_read_format_zip_read_data_skip(struct archive_read *a) else if (p[3] == '\007') { p += 1; } else if (p[3] == '\010' && p[2] == '\007' && p[1] == 'K' && p[0] == 'P') { - zip_read_consume(a, p - buff + 16); + if (zip->entry->flags & LA_USED_ZIP64) + __archive_read_consume(a, p - buff + 24); + else + __archive_read_consume(a, p - buff + 16); return ARCHIVE_OK; } else { p += 4; } } - zip_read_consume(a, p - buff); + __archive_read_consume(a, p - buff); } } } -static int -archive_read_format_zip_cleanup(struct archive_read *a) +int +archive_read_support_format_zip_streamable(struct archive *_a) { + struct archive_read *a = (struct archive_read *)_a; struct zip *zip; + int r; - zip = (struct zip *)(a->format->data); -#ifdef HAVE_ZLIB_H - if (zip->stream_valid) - inflateEnd(&zip->stream); -#endif - if (zip->zip_entries && zip->central_directory_entries) { - unsigned i; - for (i = 0; i < zip->central_directory_entries; i++) - archive_string_free(&(zip->zip_entries[i].rsrcname)); + archive_check_magic(_a, ARCHIVE_READ_MAGIC, + ARCHIVE_STATE_NEW, "archive_read_support_format_zip"); + + zip = (struct zip *)malloc(sizeof(*zip)); + if (zip == NULL) { + archive_set_error(&a->archive, ENOMEM, + "Can't allocate zip data"); + return (ARCHIVE_FATAL); } - free(zip->zip_entries); - free(zip->uncompressed_buffer); - archive_string_free(&(zip->extra)); - free(zip); - (a->format->data) = NULL; + memset(zip, 0, sizeof(*zip)); + + /* Streamable reader doesn't support mac extensions. */ + zip->process_mac_extensions = 0; + + /* + * Until enough data has been read, we cannot tell about + * any encrypted entries yet. + */ + zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; + zip->crc32func = real_crc32; + + r = __archive_read_register_format(a, + zip, + "zip", + archive_read_format_zip_streamable_bid, + archive_read_format_zip_options, + archive_read_format_zip_streamable_read_header, + archive_read_format_zip_read_data, + archive_read_format_zip_read_data_skip_streamable, + NULL, + archive_read_format_zip_cleanup, + archive_read_support_format_zip_capabilities_streamable, + archive_read_format_zip_has_encrypted_entries); + + if (r != ARCHIVE_OK) + free(zip); return (ARCHIVE_OK); } +/* ------------------------------------------------------------------------ */ + /* - * The extra data is stored as a list of - * id1+size1+data1 + id2+size2+data2 ... - * triplets. id and size are 2 bytes each. + * Seeking-mode support */ + +static int +archive_read_support_format_zip_capabilities_seekable(struct archive_read * a) +{ + (void)a; /* UNUSED */ + return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA | ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA); +} + +/* + * TODO: This is a performance sink because it forces the read core to + * drop buffered data from the start of file, which will then have to + * be re-read again if this bidder loses. + * + * We workaround this a little by passing in the best bid so far so + * that later bidders can do nothing if they know they'll never + * outbid. But we can certainly do better... + */ +static int +read_eocd(struct zip *zip, const char *p, int64_t current_offset) +{ + /* Sanity-check the EOCD we've found. */ + + /* This must be the first volume. */ + if (archive_le16dec(p + 4) != 0) + return 0; + /* Central directory must be on this volume. */ + if (archive_le16dec(p + 4) != archive_le16dec(p + 6)) + return 0; + /* All central directory entries must be on this volume. */ + if (archive_le16dec(p + 10) != archive_le16dec(p + 8)) + return 0; + /* Central directory can't extend beyond start of EOCD record. */ + if (archive_le32dec(p + 16) + archive_le32dec(p + 12) + > current_offset) + return 0; + + /* Save the central directory location for later use. */ + zip->central_directory_offset = archive_le32dec(p + 16); + + /* This is just a tiny bit higher than the maximum + returned by the streaming Zip bidder. This ensures + that the more accurate seeking Zip parser wins + whenever seek is available. */ + return 32; +} + +static int +read_zip64_eocd(struct archive_read *a, struct zip *zip, const char *p) +{ + int64_t eocd64_offset; + int64_t eocd64_size; + + /* Sanity-check the locator record. */ + + /* Central dir must be on first volume. */ + if (archive_le32dec(p + 4) != 0) + return 0; + /* Must be only a single volume. */ + if (archive_le32dec(p + 16) != 1) + return 0; + + /* Find the Zip64 EOCD record. */ + eocd64_offset = archive_le64dec(p + 8); + if (__archive_read_seek(a, eocd64_offset, SEEK_SET) < 0) + return 0; + if ((p = __archive_read_ahead(a, 56, NULL)) == NULL) + return 0; + /* Make sure we can read all of it. */ + eocd64_size = archive_le64dec(p + 4) + 12; + if (eocd64_size < 56 || eocd64_size > 16384) + return 0; + if ((p = __archive_read_ahead(a, eocd64_size, NULL)) == NULL) + return 0; + + /* Sanity-check the EOCD64 */ + if (archive_le32dec(p + 16) != 0) /* Must be disk #0 */ + return 0; + if (archive_le32dec(p + 20) != 0) /* CD must be on disk #0 */ + return 0; + /* CD can't be split. */ + if (archive_le64dec(p + 24) != archive_le64dec(p + 32)) + return 0; + + /* Save the central directory offset for later use. */ + zip->central_directory_offset = archive_le64dec(p + 48); + + return 32; +} + +static int +archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid) +{ + struct zip *zip = (struct zip *)a->format->data; + int64_t file_size, current_offset; + const char *p; + int i, tail; + + /* If someone has already bid more than 32, then avoid + trashing the look-ahead buffers with a seek. */ + if (best_bid > 32) + return (-1); + + file_size = __archive_read_seek(a, 0, SEEK_END); + if (file_size <= 0) + return 0; + + /* Search last 16k of file for end-of-central-directory + * record (which starts with PK\005\006) or Zip64 locator + * record (which begins with PK\006\007) */ + tail = zipmin(1024 * 16, file_size); + current_offset = __archive_read_seek(a, -tail, SEEK_END); + if (current_offset < 0) + return 0; + if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL) + return 0; + /* TODO: Rework this to search backwards from the end. We + * normally expect the EOCD record to be at the very end, so + * that should be significantly faster. Tricky part: Make + * sure we still prefer the Zip64 locator if it's present. */ + for (i = 0; i <= tail - 22;) { + switch (p[i + 3]) { + case 'P': i += 3; break; + case 'K': i += 2; break; + case 005: i += 1; break; + case 006: + if (memcmp(p + i, "PK\005\006", 4) == 0) { + int ret = read_eocd(zip, p + i, current_offset + i); + if (ret > 0) + return (ret); + } + i += 1; /* Look for PK\006\007 next */ + break; + case 007: + if (memcmp(p + i, "PK\006\007", 4) == 0) { + int ret = read_zip64_eocd(a, zip, p + i); + if (ret > 0) + return (ret); + } + i += 4; + break; + default: i += 4; break; + } + } + return 0; +} + +/* The red-black trees are only used in seeking mode to manage + * the in-memory copy of the central directory. */ + +static int +cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2) +{ + const struct zip_entry *e1 = (const struct zip_entry *)n1; + const struct zip_entry *e2 = (const struct zip_entry *)n2; + + if (e1->local_header_offset > e2->local_header_offset) + return -1; + if (e1->local_header_offset < e2->local_header_offset) + return 1; + return 0; +} + +static int +cmp_key(const struct archive_rb_node *n, const void *key) +{ + /* This function won't be called */ + (void)n; /* UNUSED */ + (void)key; /* UNUSED */ + return 1; +} + +static const struct archive_rb_tree_ops rb_ops = { + &cmp_node, &cmp_key +}; + +static int +rsrc_cmp_node(const struct archive_rb_node *n1, + const struct archive_rb_node *n2) +{ + const struct zip_entry *e1 = (const struct zip_entry *)n1; + const struct zip_entry *e2 = (const struct zip_entry *)n2; + + return (strcmp(e2->rsrcname.s, e1->rsrcname.s)); +} + +static int +rsrc_cmp_key(const struct archive_rb_node *n, const void *key) +{ + const struct zip_entry *e = (const struct zip_entry *)n; + return (strcmp((const char *)key, e->rsrcname.s)); +} + +static const struct archive_rb_tree_ops rb_rsrc_ops = { + &rsrc_cmp_node, &rsrc_cmp_key +}; + +static const char * +rsrc_basename(const char *name, size_t name_length) +{ + const char *s, *r; + + r = s = name; + for (;;) { + s = memchr(s, '/', name_length - (s - name)); + if (s == NULL) + break; + r = ++s; + } + return (r); +} + static void -process_extra(const char *p, size_t extra_length, struct zip_entry* zip_entry) +expose_parent_dirs(struct zip *zip, const char *name, size_t name_length) { - unsigned offset = 0; + struct archive_string str; + struct zip_entry *dir; + char *s; - while (offset < extra_length - 4) - { - unsigned short headerid = archive_le16dec(p + offset); - unsigned short datasize = archive_le16dec(p + offset + 2); - offset += 4; - if (offset + datasize > extra_length) + archive_string_init(&str); + archive_strncpy(&str, name, name_length); + for (;;) { + s = strrchr(str.s, '/'); + if (s == NULL) break; -#ifdef DEBUG - fprintf(stderr, "Header id 0x%x, length %d\n", - headerid, datasize); -#endif - switch (headerid) { - case 0x0001: - /* Zip64 extended information extra field. */ - if (datasize >= 8) - zip_entry->uncompressed_size = - archive_le64dec(p + offset); - if (datasize >= 16) - zip_entry->compressed_size = - archive_le64dec(p + offset + 8); + *s = '\0'; + /* Transfer the parent directory from zip->tree_rsrc RB + * tree to zip->tree RB tree to expose. */ + dir = (struct zip_entry *) + __archive_rb_tree_find_node(&zip->tree_rsrc, str.s); + if (dir == NULL) break; - case 0x5455: - { - /* Extended time field "UT". */ - int flags = p[offset]; - offset++; - datasize--; - /* Flag bits indicate which dates are present. */ - if (flags & 0x01) - { -#ifdef DEBUG - fprintf(stderr, "mtime: %lld -> %d\n", - (long long)zip_entry->mtime, - archive_le32dec(p + offset)); -#endif - if (datasize < 4) - break; - zip_entry->mtime = archive_le32dec(p + offset); - offset += 4; - datasize -= 4; - } - if (flags & 0x02) - { - if (datasize < 4) - break; - zip_entry->atime = archive_le32dec(p + offset); - offset += 4; - datasize -= 4; - } - if (flags & 0x04) - { - if (datasize < 4) - break; - zip_entry->ctime = archive_le32dec(p + offset); - offset += 4; - datasize -= 4; + __archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node); + archive_string_free(&dir->rsrcname); + __archive_rb_tree_insert_node(&zip->tree, &dir->node); + } + archive_string_free(&str); +} + +static int +slurp_central_directory(struct archive_read *a, struct zip *zip) +{ + ssize_t i; + unsigned found; + int64_t correction; + ssize_t bytes_avail; + const char *p; + + /* + * Find the start of the central directory. The end-of-CD + * record has our starting point, but there are lots of + * Zip archives which have had other data prepended to the + * file, which makes the recorded offsets all too small. + * So we search forward from the specified offset until we + * find the real start of the central directory. Then we + * know the correction we need to apply to account for leading + * padding. + */ + if (__archive_read_seek(a, zip->central_directory_offset, SEEK_SET) < 0) + return ARCHIVE_FATAL; + + found = 0; + while (!found) { + if ((p = __archive_read_ahead(a, 20, &bytes_avail)) == NULL) + return ARCHIVE_FATAL; + for (found = 0, i = 0; !found && i < bytes_avail - 4;) { + switch (p[i + 3]) { + case 'P': i += 3; break; + case 'K': i += 2; break; + case 001: i += 1; break; + case 002: + if (memcmp(p + i, "PK\001\002", 4) == 0) { + p += i; + found = 1; + } else + i += 4; + break; + case 005: i += 1; break; + case 006: + if (memcmp(p + i, "PK\005\006", 4) == 0) { + p += i; + found = 1; + } else if (memcmp(p + i, "PK\006\006", 4) == 0) { + p += i; + found = 1; + } else + i += 1; + break; + default: i += 4; break; } + } + __archive_read_consume(a, i); + } + correction = archive_filter_bytes(&a->archive, 0) - zip->central_directory_offset; + + __archive_rb_tree_init(&zip->tree, &rb_ops); + __archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops); + + zip->central_directory_entries_total = 0; + while (1) { + struct zip_entry *zip_entry; + size_t filename_length, extra_length, comment_length; + uint32_t external_attributes; + const char *name, *r; + + if ((p = __archive_read_ahead(a, 4, NULL)) == NULL) + return ARCHIVE_FATAL; + if (memcmp(p, "PK\006\006", 4) == 0 + || memcmp(p, "PK\005\006", 4) == 0) { break; + } else if (memcmp(p, "PK\001\002", 4) != 0) { + archive_set_error(&a->archive, + -1, "Invalid central directory signature"); + return ARCHIVE_FATAL; } - case 0x5855: - { - /* Info-ZIP Unix Extra Field (old version) "UX". */ - if (datasize >= 8) { - zip_entry->atime = archive_le32dec(p + offset); - zip_entry->mtime = - archive_le32dec(p + offset + 4); - } - if (datasize >= 12) { - zip_entry->uid = - archive_le16dec(p + offset + 8); - zip_entry->gid = - archive_le16dec(p + offset + 10); + if ((p = __archive_read_ahead(a, 46, NULL)) == NULL) + return ARCHIVE_FATAL; + + zip_entry = calloc(1, sizeof(struct zip_entry)); + zip_entry->next = zip->zip_entries; + zip_entry->flags |= LA_FROM_CENTRAL_DIRECTORY; + zip->zip_entries = zip_entry; + zip->central_directory_entries_total++; + + /* version = p[4]; */ + zip_entry->system = p[5]; + /* version_required = archive_le16dec(p + 6); */ + zip_entry->zip_flags = archive_le16dec(p + 8); + if (zip_entry->zip_flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)){ + zip->has_encrypted_entries = 1; + } + zip_entry->compression = (char)archive_le16dec(p + 10); + zip_entry->mtime = zip_time(p + 12); + zip_entry->crc32 = archive_le32dec(p + 16); + zip_entry->compressed_size = archive_le32dec(p + 20); + zip_entry->uncompressed_size = archive_le32dec(p + 24); + filename_length = archive_le16dec(p + 28); + extra_length = archive_le16dec(p + 30); + comment_length = archive_le16dec(p + 32); + /* disk_start = archive_le16dec(p + 34); */ /* Better be zero. */ + /* internal_attributes = archive_le16dec(p + 36); */ /* text bit */ + external_attributes = archive_le32dec(p + 38); + zip_entry->local_header_offset = + archive_le32dec(p + 42) + correction; + + /* If we can't guess the mode, leave it zero here; + when we read the local file header we might get + more information. */ + zip_entry->mode = 0; + if (zip_entry->system == 3) { + zip_entry->mode = external_attributes >> 16; + } + + /* We're done with the regular data; get the filename and + * extra data. */ + __archive_read_consume(a, 46); + if ((p = __archive_read_ahead(a, filename_length + extra_length, NULL)) + == NULL) { + archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, + "Truncated ZIP file header"); + return ARCHIVE_FATAL; + } + process_extra(p + filename_length, extra_length, zip_entry); + + /* + * Mac resource fork files are stored under the + * "__MACOSX/" directory, so we should check if + * it is. + */ + if (!zip->process_mac_extensions) { + /* Treat every entry as a regular entry. */ + __archive_rb_tree_insert_node(&zip->tree, + &zip_entry->node); + } else { + name = p; + r = rsrc_basename(name, filename_length); + if (filename_length >= 9 && + strncmp("__MACOSX/", name, 9) == 0) { + /* If this file is not a resource fork nor + * a directory. We should treat it as a non + * resource fork file to expose it. */ + if (name[filename_length-1] != '/' && + (r - name < 3 || r[0] != '.' || r[1] != '_')) { + __archive_rb_tree_insert_node(&zip->tree, + &zip_entry->node); + /* Expose its parent directories. */ + expose_parent_dirs(zip, name, filename_length); + } else { + /* This file is a resource fork file or + * a directory. */ + archive_strncpy(&(zip_entry->rsrcname), name, + filename_length); + __archive_rb_tree_insert_node(&zip->tree_rsrc, + &zip_entry->node); + } + } else { + /* Generate resource fork name to find its resource + * file at zip->tree_rsrc. */ + archive_strcpy(&(zip_entry->rsrcname), "__MACOSX/"); + archive_strncat(&(zip_entry->rsrcname), name, r - name); + archive_strcat(&(zip_entry->rsrcname), "._"); + archive_strncat(&(zip_entry->rsrcname), + name + (r - name), filename_length - (r - name)); + /* Register an entry to RB tree to sort it by + * file offset. */ + __archive_rb_tree_insert_node(&zip->tree, + &zip_entry->node); } - break; } - case 0x7855: - /* Info-ZIP Unix Extra Field (type 2) "Ux". */ -#ifdef DEBUG - fprintf(stderr, "uid %d gid %d\n", - archive_le16dec(p + offset), - archive_le16dec(p + offset + 2)); + + /* Skip the comment too ... */ + __archive_read_consume(a, + filename_length + extra_length + comment_length); + } + + return ARCHIVE_OK; +} + +static ssize_t +zip_get_local_file_header_size(struct archive_read *a, size_t extra) +{ + const char *p; + ssize_t filename_length, extra_length; + + if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) { + archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, + "Truncated ZIP file header"); + return (ARCHIVE_WARN); + } + p += extra; + + if (memcmp(p, "PK\003\004", 4) != 0) { + archive_set_error(&a->archive, -1, "Damaged Zip archive"); + return ARCHIVE_WARN; + } + filename_length = archive_le16dec(p + 26); + extra_length = archive_le16dec(p + 28); + + return (30 + filename_length + extra_length); +} + +static int +zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry, + struct zip_entry *rsrc) +{ + struct zip *zip = (struct zip *)a->format->data; + unsigned char *metadata, *mp; + int64_t offset = archive_filter_bytes(&a->archive, 0); + size_t remaining_bytes, metadata_bytes; + ssize_t hsize; + int ret = ARCHIVE_OK, eof; + + switch(rsrc->compression) { + case 0: /* No compression. */ +#ifdef HAVE_ZLIB_H + case 8: /* Deflate compression. */ #endif - if (datasize >= 2) - zip_entry->uid = archive_le16dec(p + offset); - if (datasize >= 4) - zip_entry->gid = - archive_le16dec(p + offset + 2); + break; + default: /* Unsupported compression. */ + /* Return a warning. */ + archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, + "Unsupported ZIP compression method (%s)", + compression_name(rsrc->compression)); + /* We can't decompress this entry, but we will + * be able to skip() it and try the next entry. */ + return (ARCHIVE_WARN); + } + + if (rsrc->uncompressed_size > (4 * 1024 * 1024)) { + archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, + "Mac metadata is too large: %jd > 4M bytes", + (intmax_t)rsrc->uncompressed_size); + return (ARCHIVE_WARN); + } + + metadata = malloc((size_t)rsrc->uncompressed_size); + if (metadata == NULL) { + archive_set_error(&a->archive, ENOMEM, + "Can't allocate memory for Mac metadata"); + return (ARCHIVE_FATAL); + } + + if (offset < rsrc->local_header_offset) + __archive_read_consume(a, rsrc->local_header_offset - offset); + else if (offset != rsrc->local_header_offset) { + __archive_read_seek(a, rsrc->local_header_offset, SEEK_SET); + } + + hsize = zip_get_local_file_header_size(a, 0); + __archive_read_consume(a, hsize); + + remaining_bytes = (size_t)rsrc->compressed_size; + metadata_bytes = (size_t)rsrc->uncompressed_size; + mp = metadata; + eof = 0; + while (!eof && remaining_bytes) { + const unsigned char *p; + ssize_t bytes_avail; + size_t bytes_used; + + p = __archive_read_ahead(a, 1, &bytes_avail); + if (p == NULL) { + archive_set_error(&a->archive, + ARCHIVE_ERRNO_FILE_FORMAT, + "Truncated ZIP file header"); + ret = ARCHIVE_WARN; + goto exit_mac_metadata; + } + if ((size_t)bytes_avail > remaining_bytes) + bytes_avail = remaining_bytes; + switch(rsrc->compression) { + case 0: /* No compression. */ + memcpy(mp, p, bytes_avail); + bytes_used = (size_t)bytes_avail; + metadata_bytes -= bytes_used; + mp += bytes_used; + if (metadata_bytes == 0) + eof = 1; break; - case 0x7875: +#ifdef HAVE_ZLIB_H + case 8: /* Deflate compression. */ { - /* Info-Zip Unix Extra Field (type 3) "ux". */ - int uidsize = 0, gidsize = 0; + int r; - if (datasize >= 1 && p[offset] == 1) {/* version=1 */ - if (datasize >= 4) { - /* get a uid size. */ - uidsize = p[offset+1]; - if (uidsize == 2) - zip_entry->uid = - archive_le16dec( - p + offset + 2); - else if (uidsize == 4 && datasize >= 6) - zip_entry->uid = - archive_le32dec( - p + offset + 2); - } - if (datasize >= (2 + uidsize + 3)) { - /* get a gid size. */ - gidsize = p[offset+2+uidsize]; - if (gidsize == 2) - zip_entry->gid = - archive_le16dec( - p+offset+2+uidsize+1); - else if (gidsize == 4 && - datasize >= (2 + uidsize + 5)) - zip_entry->gid = - archive_le32dec( - p+offset+2+uidsize+1); - } + ret = zip_deflate_init(a, zip); + if (ret != ARCHIVE_OK) + goto exit_mac_metadata; + zip->stream.next_in = + (Bytef *)(uintptr_t)(const void *)p; + zip->stream.avail_in = (uInt)bytes_avail; + zip->stream.total_in = 0; + zip->stream.next_out = mp; + zip->stream.avail_out = (uInt)metadata_bytes; + zip->stream.total_out = 0; + + r = inflate(&zip->stream, 0); + switch (r) { + case Z_OK: + break; + case Z_STREAM_END: + eof = 1; + break; + case Z_MEM_ERROR: + archive_set_error(&a->archive, ENOMEM, + "Out of memory for ZIP decompression"); + ret = ARCHIVE_FATAL; + goto exit_mac_metadata; + default: + archive_set_error(&a->archive, + ARCHIVE_ERRNO_MISC, + "ZIP decompression failed (%d)", r); + ret = ARCHIVE_FATAL; + goto exit_mac_metadata; } + bytes_used = zip->stream.total_in; + metadata_bytes -= zip->stream.total_out; + mp += zip->stream.total_out; break; } +#endif default: + bytes_used = 0; break; } - offset += datasize; + __archive_read_consume(a, bytes_used); + remaining_bytes -= bytes_used; } -#ifdef DEBUG - if (offset != extra_length) - { - fprintf(stderr, - "Extra data field contents do not match reported size!\n"); + archive_entry_copy_mac_metadata(entry, metadata, + (size_t)rsrc->uncompressed_size - metadata_bytes); + +exit_mac_metadata: + __archive_read_seek(a, offset, SEEK_SET); + zip->decompress_init = 0; + free(metadata); + return (ret); +} + +static int +archive_read_format_zip_seekable_read_header(struct archive_read *a, + struct archive_entry *entry) +{ + struct zip *zip = (struct zip *)a->format->data; + struct zip_entry *rsrc; + int64_t offset; + int r, ret = ARCHIVE_OK; + + /* + * It should be sufficient to call archive_read_next_header() for + * a reader to determine if an entry is encrypted or not. If the + * encryption of an entry is only detectable when calling + * archive_read_data(), so be it. We'll do the same check there + * as well. + */ + if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { + zip->has_encrypted_entries = 0; + } + + a->archive.archive_format = ARCHIVE_FORMAT_ZIP; + if (a->archive.archive_format_name == NULL) + a->archive.archive_format_name = "ZIP"; + + if (zip->zip_entries == NULL) { + r = slurp_central_directory(a, zip); + if (r != ARCHIVE_OK) + return r; + /* Get first entry whose local header offset is lower than + * other entries in the archive file. */ + zip->entry = + (struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree); + } else if (zip->entry != NULL) { + /* Get next entry in local header offset order. */ + zip->entry = (struct zip_entry *)__archive_rb_tree_iterate( + &zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT); + } + + if (zip->entry == NULL) + return ARCHIVE_EOF; + + if (zip->entry->rsrcname.s) + rsrc = (struct zip_entry *)__archive_rb_tree_find_node( + &zip->tree_rsrc, zip->entry->rsrcname.s); + else + rsrc = NULL; + + /* File entries are sorted by the header offset, we should mostly + * use __archive_read_consume to advance a read point to avoid redundant + * data reading. */ + offset = archive_filter_bytes(&a->archive, 0); + if (offset < zip->entry->local_header_offset) + __archive_read_consume(a, + zip->entry->local_header_offset - offset); + else if (offset != zip->entry->local_header_offset) { + __archive_read_seek(a, zip->entry->local_header_offset, SEEK_SET); } + zip->unconsumed = 0; + r = zip_read_local_file_header(a, entry, zip); + if (r != ARCHIVE_OK) + return r; + if (rsrc) { + int ret2 = zip_read_mac_metadata(a, entry, rsrc); + if (ret2 < ret) + ret = ret2; + } + return (ret); +} + +/* + * We're going to seek for the next header anyway, so we don't + * need to bother doing anything here. + */ +static int +archive_read_format_zip_read_data_skip_seekable(struct archive_read *a) +{ + struct zip *zip; + zip = (struct zip *)(a->format->data); + + zip->unconsumed = 0; + return (ARCHIVE_OK); +} + +int +archive_read_support_format_zip_seekable(struct archive *_a) +{ + struct archive_read *a = (struct archive_read *)_a; + struct zip *zip; + int r; + + archive_check_magic(_a, ARCHIVE_READ_MAGIC, + ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable"); + + zip = (struct zip *)malloc(sizeof(*zip)); + if (zip == NULL) { + archive_set_error(&a->archive, ENOMEM, + "Can't allocate zip data"); + return (ARCHIVE_FATAL); + } + memset(zip, 0, sizeof(*zip)); + +#ifdef HAVE_COPYFILE_H + /* Set this by default on Mac OS. */ + zip->process_mac_extensions = 1; #endif + + /* + * Until enough data has been read, we cannot tell about + * any encrypted entries yet. + */ + zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; + zip->crc32func = real_crc32; + + r = __archive_read_register_format(a, + zip, + "zip", + archive_read_format_zip_seekable_bid, + archive_read_format_zip_options, + archive_read_format_zip_seekable_read_header, + archive_read_format_zip_read_data, + archive_read_format_zip_read_data_skip_seekable, + NULL, + archive_read_format_zip_cleanup, + archive_read_support_format_zip_capabilities_seekable, + archive_read_format_zip_has_encrypted_entries); + + if (r != ARCHIVE_OK) + free(zip); + return (ARCHIVE_OK); } |