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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 https://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