diff options
Diffstat (limited to 'Utilities/cmcurl/http_chunks.c')
| -rw-r--r-- | Utilities/cmcurl/http_chunks.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/Utilities/cmcurl/http_chunks.c b/Utilities/cmcurl/http_chunks.c new file mode 100644 index 0000000..02fdfc5 --- /dev/null +++ b/Utilities/cmcurl/http_chunks.c @@ -0,0 +1,264 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al. + * + * This software is licensed as described in the file COPYING, which + * you should have received as part of this distribution. The terms + * are also available at http://curl.haxx.se/docs/copyright.html. + * + * You may opt to use, copy, modify, merge, publish, distribute and/or sell + * copies of the Software, and permit persons to whom the Software is + * furnished to do so, under the terms of the COPYING file. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + * $Id$ + ***************************************************************************/ +#include "setup.h" + +#ifndef CURL_DISABLE_HTTP +/* -- WIN32 approved -- */ +#include <stdio.h> +#include <string.h> +#include <stdarg.h> +#include <stdlib.h> +#include <ctype.h> + +#include "urldata.h" /* it includes http_chunks.h */ +#include "sendf.h" /* for the client write stuff */ + +#include "content_encoding.h" +#include "http.h" +#include "curl_memory.h" + +#define _MPRINTF_REPLACE /* use our functions only */ +#include <curl/mprintf.h> + +/* The last #include file should be: */ +#include "memdebug.h" + +/* + * Chunk format (simplified): + * + * <HEX SIZE>[ chunk extension ] CRLF + * <DATA> CRLF + * + * Highlights from RFC2616 section 3.6 say: + + The chunked encoding modifies the body of a message in order to + transfer it as a series of chunks, each with its own size indicator, + followed by an OPTIONAL trailer containing entity-header fields. This + allows dynamically produced content to be transferred along with the + information necessary for the recipient to verify that it has + received the full message. + + Chunked-Body = *chunk + last-chunk + trailer + CRLF + + chunk = chunk-size [ chunk-extension ] CRLF + chunk-data CRLF + chunk-size = 1*HEX + last-chunk = 1*("0") [ chunk-extension ] CRLF + + chunk-extension= *( ";" chunk-ext-name [ "=" chunk-ext-val ] ) + chunk-ext-name = token + chunk-ext-val = token | quoted-string + chunk-data = chunk-size(OCTET) + trailer = *(entity-header CRLF) + + The chunk-size field is a string of hex digits indicating the size of + the chunk. The chunked encoding is ended by any chunk whose size is + zero, followed by the trailer, which is terminated by an empty line. + + */ + + +void Curl_httpchunk_init(struct connectdata *conn) +{ + struct Curl_chunker *chunk = &conn->proto.http->chunk; + chunk->hexindex=0; /* start at 0 */ + chunk->dataleft=0; /* no data left yet! */ + chunk->state = CHUNK_HEX; /* we get hex first! */ +} + +/* + * chunk_read() returns a OK for normal operations, or a positive return code + * for errors. STOP means this sequence of chunks is complete. The 'wrote' + * argument is set to tell the caller how many bytes we actually passed to the + * client (for byte-counting and whatever). + * + * The states and the state-machine is further explained in the header file. + */ +CHUNKcode Curl_httpchunk_read(struct connectdata *conn, + char *datap, + ssize_t datalen, + ssize_t *wrotep) +{ + CURLcode result=CURLE_OK; + struct Curl_chunker *ch = &conn->proto.http->chunk; + struct Curl_transfer_keeper *k = &conn->keep; + size_t piece; + size_t length = (size_t)datalen; + size_t *wrote = (size_t *)wrotep; + + *wrote = 0; /* nothing's written yet */ + + while(length) { + switch(ch->state) { + case CHUNK_HEX: + if(isxdigit((int)*datap)) { + if(ch->hexindex < MAXNUM_SIZE) { + ch->hexbuffer[ch->hexindex] = *datap; + datap++; + length--; + ch->hexindex++; + } + else { + return CHUNKE_TOO_LONG_HEX; /* longer hex than we support */ + } + } + else { + if(0 == ch->hexindex) { + /* This is illegal data, we received junk where we expected + a hexadecimal digit. */ + return CHUNKE_ILLEGAL_HEX; + } + /* length and datap are unmodified */ + ch->hexbuffer[ch->hexindex]=0; + ch->datasize=strtoul(ch->hexbuffer, NULL, 16); + ch->state = CHUNK_POSTHEX; + } + break; + + case CHUNK_POSTHEX: + /* In this state, we're waiting for CRLF to arrive. We support + this to allow so called chunk-extensions to show up here + before the CRLF comes. */ + if(*datap == '\r') + ch->state = CHUNK_CR; + length--; + datap++; + break; + + case CHUNK_CR: + /* waiting for the LF */ + if(*datap == '\n') { + /* we're now expecting data to come, unless size was zero! */ + if(0 == ch->datasize) { + ch->state = CHUNK_STOP; /* stop reading! */ + if(1 == length) { + /* This was the final byte, return right now */ + return CHUNKE_STOP; + } + } + else + ch->state = CHUNK_DATA; + } + else + /* previously we got a fake CR, go back to CR waiting! */ + ch->state = CHUNK_CR; + datap++; + length--; + break; + + case CHUNK_DATA: + /* we get pure and fine data + + We expect another 'datasize' of data. We have 'length' right now, + it can be more or less than 'datasize'. Get the smallest piece. + */ + piece = (ch->datasize >= length)?length:ch->datasize; + + /* Write the data portion available */ +#ifdef HAVE_LIBZ + switch (conn->keep.content_encoding) { + case IDENTITY: +#endif + if(!k->ignorebody) + result = Curl_client_write(conn->data, CLIENTWRITE_BODY, datap, + piece); +#ifdef HAVE_LIBZ + break; + + case DEFLATE: + /* update conn->keep.str to point to the chunk data. */ + conn->keep.str = datap; + result = Curl_unencode_deflate_write(conn->data, &conn->keep, + (ssize_t)piece); + break; + + case GZIP: + /* update conn->keep.str to point to the chunk data. */ + conn->keep.str = datap; + result = Curl_unencode_gzip_write(conn->data, &conn->keep, + (ssize_t)piece); + break; + + case COMPRESS: + default: + failf (conn->data, + "Unrecognized content encoding type. " + "libcurl understands `identity', `deflate' and `gzip' " + "content encodings."); + return CHUNKE_BAD_ENCODING; + } +#endif + + if(result) + return CHUNKE_WRITE_ERROR; + + *wrote += piece; + + ch->datasize -= piece; /* decrease amount left to expect */ + datap += piece; /* move read pointer forward */ + length -= piece; /* decrease space left in this round */ + + if(0 == ch->datasize) + /* end of data this round, we now expect a trailing CRLF */ + ch->state = CHUNK_POSTCR; + break; + + case CHUNK_POSTCR: + if(*datap == '\r') { + ch->state = CHUNK_POSTLF; + datap++; + length--; + } + else + return CHUNKE_BAD_CHUNK; + break; + + case CHUNK_POSTLF: + if(*datap == '\n') { + /* + * The last one before we go back to hex state and start all + * over. + */ + Curl_httpchunk_init(conn); + datap++; + length--; + } + else + return CHUNKE_BAD_CHUNK; + break; + + case CHUNK_STOP: + /* If we arrive here, there is data left in the end of the buffer + even if there's no more chunks to read */ + ch->dataleft = length; + return CHUNKE_STOP; /* return stop */ + default: + return CHUNKE_STATE_ERROR; + } + } + return CHUNKE_OK; +} +#endif /* CURL_DISABLE_HTTP */ |