diff options
Diffstat (limited to 'compat/zlib/contrib/puff')
| -rw-r--r-- | compat/zlib/contrib/puff/puff.c | 193 | ||||
| -rw-r--r-- | compat/zlib/contrib/puff/puff.h | 4 |
2 files changed, 151 insertions, 46 deletions
diff --git a/compat/zlib/contrib/puff/puff.c b/compat/zlib/contrib/puff/puff.c index ce0cc40..df5b79f 100644 --- a/compat/zlib/contrib/puff/puff.c +++ b/compat/zlib/contrib/puff/puff.c @@ -1,8 +1,8 @@ /* * puff.c - * Copyright (C) 2002-2004 Mark Adler + * Copyright (C) 2002-2008 Mark Adler * For conditions of distribution and use, see copyright notice in puff.h - * version 1.8, 9 Jan 2004 + * version 2.0, 25 Jul 2008 * * puff.c is a simple inflate written to be an unambiguous way to specify the * deflate format. It is not written for speed but rather simplicity. As a @@ -61,6 +61,12 @@ * 1.7 3 Mar 2003 - Added test code for distribution * - Added zlib-like license * 1.8 9 Jan 2004 - Added some comments on no distance codes case + * 1.9 21 Feb 2008 - Fix bug on 16-bit integer architectures [Pohland] + * - Catch missing end-of-block symbol error + * 2.0 25 Jul 2008 - Add #define to permit distance too far back + * - Add option in TEST code for puff to write the data + * - Add option in TEST code to skip input bytes + * - Allow TEST code to read from piped stdin */ #include <setjmp.h> /* for setjmp(), longjmp(), and jmp_buf */ @@ -194,7 +200,7 @@ struct huffman { * Decode a code from the stream s using huffman table h. Return the symbol or * a negative value if there is an error. If all of the lengths are zero, i.e. * an empty code, or if the code is incomplete and an invalid code is received, - * then -9 is returned after reading MAXBITS bits. + * then -10 is returned after reading MAXBITS bits. * * Format notes: * @@ -226,14 +232,14 @@ local int decode(struct state *s, struct huffman *h) for (len = 1; len <= MAXBITS; len++) { code |= bits(s, 1); /* get next bit */ count = h->count[len]; - if (code < first + count) /* if length len, return symbol */ + if (code - count < first) /* if length len, return symbol */ return h->symbol[index + (code - first)]; index += count; /* else update for next length */ first += count; first <<= 1; code <<= 1; } - return -9; /* ran out of codes */ + return -10; /* ran out of codes */ } /* @@ -263,7 +269,7 @@ local int decode(struct state *s, struct huffman *h) code |= bitbuf & 1; bitbuf >>= 1; count = *next++; - if (code < first + count) { /* if length len, return symbol */ + if (code - count < first) { /* if length len, return symbol */ s->bitbuf = bitbuf; s->bitcnt = (s->bitcnt - len) & 7; return h->symbol[index + (code - first)]; @@ -280,7 +286,7 @@ local int decode(struct state *s, struct huffman *h) bitbuf = s->in[s->incnt++]; if (left > 8) left = 8; } - return -9; /* ran out of codes */ + return -10; /* ran out of codes */ } #endif /* SLOW */ @@ -448,21 +454,27 @@ local int codes(struct state *s, else if (symbol > 256) { /* length */ /* get and compute length */ symbol -= 257; - if (symbol >= 29) return -9; /* invalid fixed code */ + if (symbol >= 29) return -10; /* invalid fixed code */ len = lens[symbol] + bits(s, lext[symbol]); /* get and check distance */ symbol = decode(s, distcode); if (symbol < 0) return symbol; /* invalid symbol */ dist = dists[symbol] + bits(s, dext[symbol]); +#ifndef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR if (dist > s->outcnt) - return -10; /* distance too far back */ + return -11; /* distance too far back */ +#endif /* copy length bytes from distance bytes back */ if (s->out != NIL) { if (s->outcnt + len > s->outlen) return 1; while (len--) { - s->out[s->outcnt] = s->out[s->outcnt - dist]; + s->out[s->outcnt] = +#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR + dist > s->outcnt ? 0 : +#endif + s->out[s->outcnt - dist]; s->outcnt++; } } @@ -680,6 +692,10 @@ local int dynamic(struct state *s) } } + /* check for end-of-block code -- there better be one! */ + if (lengths[256] == 0) + return -9; + /* build huffman table for literal/length codes */ err = construct(&lencode, lengths, nlen); if (err < 0 || (err > 0 && nlen - lencode.count[0] != 1)) @@ -724,8 +740,9 @@ local int dynamic(struct state *s) * -6: dynamic block code description: repeat more than specified lengths * -7: dynamic block code description: invalid literal/length code lengths * -8: dynamic block code description: invalid distance code lengths - * -9: invalid literal/length or distance code in fixed or dynamic block - * -10: distance is too far back in fixed or dynamic block + * -9: dynamic block code description: missing end-of-block code + * -10: invalid literal/length or distance code in fixed or dynamic block + * -11: distance is too far back in fixed or dynamic block * * Format notes: * @@ -783,54 +800,142 @@ int puff(unsigned char *dest, /* pointer to destination pointer */ } #ifdef TEST -/* Example of how to use puff() */ +/* Examples of how to use puff(). + + Usage: puff [-w] [-nnn] file + ... | puff [-w] [-nnn] + + where file is the input file with deflate data, nnn is the number of bytes + of input to skip before inflating (e.g. to skip a zlib or gzip header), and + -w is used to write the decompressed data to stdout */ + #include <stdio.h> #include <stdlib.h> -#include <sys/types.h> -#include <sys/stat.h> -local unsigned char *yank(char *name, unsigned long *len) +/* Return size times approximately the cube root of 2, keeping the result as 1, + 3, or 5 times a power of 2 -- the result is always > size, until the result + is the maximum value of an unsigned long, where it remains. This is useful + to keep reallocations less than ~33% over the actual data. */ +local size_t bythirds(size_t size) { - unsigned long size; - unsigned char *buf; + int n; + size_t m; + + m = size; + for (n = 0; m; n++) + m >>= 1; + if (n < 3) + return size + 1; + n -= 3; + m = size >> n; + m += m == 6 ? 2 : 1; + m <<= n; + return m > size ? m : (size_t)(-1); +} + +/* Read the input file *name, or stdin if name is NULL, into allocated memory. + Reallocate to larger buffers until the entire file is read in. Return a + pointer to the allocated data, or NULL if there was a memory allocation + failure. *len is the number of bytes of data read from the input file (even + if load() returns NULL). If the input file was empty or could not be opened + or read, *len is zero. */ +local void *load(char *name, size_t *len) +{ + size_t size; + void *buf, *swap; FILE *in; - struct stat s; *len = 0; - if (stat(name, &s)) return NULL; - if ((s.st_mode & S_IFMT) != S_IFREG) return NULL; - size = (unsigned long)(s.st_size); - if (size == 0 || (off_t)size != s.st_size) return NULL; - in = fopen(name, "r"); - if (in == NULL) return NULL; - buf = malloc(size); - if (buf != NULL && fread(buf, 1, size, in) != size) { - free(buf); - buf = NULL; + buf = malloc(size = 4096); + if (buf == NULL) + return NULL; + in = name == NULL ? stdin : fopen(name, "rb"); + if (in != NULL) { + for (;;) { + *len += fread((char *)buf + *len, 1, size - *len, in); + if (*len < size) break; + size = bythirds(size); + if (size == *len || (swap = realloc(buf, size)) == NULL) { + free(buf); + buf = NULL; + break; + } + buf = swap; + } + fclose(in); } - fclose(in); - *len = size; return buf; } int main(int argc, char **argv) { - int ret; - unsigned char *source; - unsigned long len, sourcelen, destlen; - - if (argc < 2) return 2; - source = yank(argv[1], &len); - if (source == NULL) return 2; - sourcelen = len; - ret = puff(NIL, &destlen, source, &sourcelen); + int ret, skip = 0, put = 0; + char *arg, *name = NULL; + unsigned char *source = NULL, *dest; + size_t len = 0; + unsigned long sourcelen, destlen; + + /* process arguments */ + while (arg = *++argv, --argc) + if (arg[0] == '-') { + if (arg[1] == 'w' && arg[2] == 0) + put = 1; + else if (arg[1] >= '0' && arg[1] <= '9') + skip = atoi(arg + 1); + else { + fprintf(stderr, "invalid option %s\n", arg); + return 3; + } + } + else if (name != NULL) { + fprintf(stderr, "only one file name allowed\n"); + return 3; + } + else + name = arg; + source = load(name, &len); + if (source == NULL) { + fprintf(stderr, "memory allocation failure\n"); + return 4; + } + if (len == 0) { + fprintf(stderr, "could not read %s, or it was empty\n", + name == NULL ? "<stdin>" : name); + free(source); + return 3; + } + if (skip >= len) { + fprintf(stderr, "skip request of %d leaves no input\n", skip); + free(source); + return 3; + } + + /* test inflate data with offset skip */ + len -= skip; + sourcelen = (unsigned long)len; + ret = puff(NIL, &destlen, source + skip, &sourcelen); if (ret) - printf("puff() failed with return code %d\n", ret); + fprintf(stderr, "puff() failed with return code %d\n", ret); else { - printf("puff() succeeded uncompressing %lu bytes\n", destlen); - if (sourcelen < len) printf("%lu compressed bytes unused\n", - len - sourcelen); + fprintf(stderr, "puff() succeeded uncompressing %lu bytes\n", destlen); + if (sourcelen < len) fprintf(stderr, "%lu compressed bytes unused\n", + len - sourcelen); } + + /* if requested, inflate again and write decompressd data to stdout */ + if (put) { + dest = malloc(destlen); + if (dest == NULL) { + fprintf(stderr, "memory allocation failure\n"); + free(source); + return 4; + } + puff(dest, &destlen, source + skip, &sourcelen); + fwrite(dest, 1, destlen, stdout); + free(dest); + } + + /* clean up */ free(source); return ret; } diff --git a/compat/zlib/contrib/puff/puff.h b/compat/zlib/contrib/puff/puff.h index ef61252..8d7f5f8 100644 --- a/compat/zlib/contrib/puff/puff.h +++ b/compat/zlib/contrib/puff/puff.h @@ -1,6 +1,6 @@ /* puff.h - Copyright (C) 2002, 2003 Mark Adler, all rights reserved - version 1.7, 3 Mar 2002 + Copyright (C) 2002-2008 Mark Adler, all rights reserved + version 1.9, 10 Jan 2008 This software is provided 'as-is', without any express or implied warranty. In no event will the author be held liable for any damages |