1 #ifndef HEADER_CURL_HTTP_CHUNKS_H 2 #define HEADER_CURL_HTTP_CHUNKS_H 3 /*************************************************************************** 4 * _ _ ____ _ 5 * Project ___| | | | _ \| | 6 * / __| | | | |_) | | 7 * | (__| |_| | _ <| |___ 8 * \___|\___/|_| \_\_____| 9 * 10 * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al. 11 * 12 * This software is licensed as described in the file COPYING, which 13 * you should have received as part of this distribution. The terms 14 * are also available at http://curl.haxx.se/docs/copyright.html. 15 * 16 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 17 * copies of the Software, and permit persons to whom the Software is 18 * furnished to do so, under the terms of the COPYING file. 19 * 20 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 21 * KIND, either express or implied. 22 * 23 ***************************************************************************/ 24 /* 25 * The longest possible hexadecimal number we support in a chunked transfer. 26 * Weird enough, RFC2616 doesn't set a maximum size! Since we use strtoul() 27 * to convert it, we "only" support 2^32 bytes chunk data. 28 */ 29 #define MAXNUM_SIZE 16 30 31 typedef enum { 32 /* await and buffer all hexadecimal digits until we get one that isn't a 33 hexadecimal digit. When done, we go CHUNK_LF */ 34 CHUNK_HEX, 35 36 /* wait for LF, ignore all else */ 37 CHUNK_LF, 38 39 /* We eat the amount of data specified. When done, we move on to the 40 POST_CR state. */ 41 CHUNK_DATA, 42 43 /* POSTLF should get a CR and then a LF and nothing else, then move back to 44 HEX as the CRLF combination marks the end of a chunk. A missing CR is no 45 big deal. */ 46 CHUNK_POSTLF, 47 48 /* Used to mark that we're out of the game. NOTE: that there's a 'dataleft' 49 field in the struct that will tell how many bytes that were not passed to 50 the client in the end of the last buffer! */ 51 CHUNK_STOP, 52 53 /* At this point optional trailer headers can be found, unless the next line 54 is CRLF */ 55 CHUNK_TRAILER, 56 57 /* A trailer CR has been found - next state is CHUNK_TRAILER_POSTCR. 58 Next char must be a LF */ 59 CHUNK_TRAILER_CR, 60 61 /* A trailer LF must be found now, otherwise CHUNKE_BAD_CHUNK will be 62 signalled If this is an empty trailer CHUNKE_STOP will be signalled. 63 Otherwise the trailer will be broadcasted via Curl_client_write() and the 64 next state will be CHUNK_TRAILER */ 65 CHUNK_TRAILER_POSTCR 66 } ChunkyState; 67 68 typedef enum { 69 CHUNKE_STOP = -1, 70 CHUNKE_OK = 0, 71 CHUNKE_TOO_LONG_HEX = 1, 72 CHUNKE_ILLEGAL_HEX, 73 CHUNKE_BAD_CHUNK, 74 CHUNKE_WRITE_ERROR, 75 CHUNKE_BAD_ENCODING, 76 CHUNKE_OUT_OF_MEMORY, 77 CHUNKE_LAST 78 } CHUNKcode; 79 80 const char *Curl_chunked_strerror(CHUNKcode code); 81 82 struct Curl_chunker { 83 char hexbuffer[ MAXNUM_SIZE + 1]; 84 int hexindex; 85 ChunkyState state; 86 curl_off_t datasize; 87 size_t dataleft; /* untouched data amount at the end of the last buffer */ 88 }; 89 90 #endif /* HEADER_CURL_HTTP_CHUNKS_H */ 91 92