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 - 2022, Daniel Stenberg, <[email protected]>, 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.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 * SPDX-License-Identifier: curl
24 *
25 ***************************************************************************/
26
27struct connectdata;
28
29/*
30 * The longest possible hexadecimal number we support in a chunked transfer.
31 * Neither RFC2616 nor the later HTTP specs define a maximum chunk size.
32 * For 64 bit curl_off_t we support 16 digits. For 32 bit, 8 digits.
33 */
34#define CHUNK_MAXNUM_LEN (SIZEOF_CURL_OFF_T * 2)
35
36typedef enum {
37 /* await and buffer all hexadecimal digits until we get one that isn't a
38 hexadecimal digit. When done, we go CHUNK_LF */
39 CHUNK_HEX,
40
41 /* wait for LF, ignore all else */
42 CHUNK_LF,
43
44 /* We eat the amount of data specified. When done, we move on to the
45 POST_CR state. */
46 CHUNK_DATA,
47
48 /* POSTLF should get a CR and then a LF and nothing else, then move back to
49 HEX as the CRLF combination marks the end of a chunk. A missing CR is no
50 big deal. */
51 CHUNK_POSTLF,
52
53 /* Used to mark that we're out of the game. NOTE: that there's a 'datasize'
54 field in the struct that will tell how many bytes that were not passed to
55 the client in the end of the last buffer! */
56 CHUNK_STOP,
57
58 /* At this point optional trailer headers can be found, unless the next line
59 is CRLF */
60 CHUNK_TRAILER,
61
62 /* A trailer CR has been found - next state is CHUNK_TRAILER_POSTCR.
63 Next char must be a LF */
64 CHUNK_TRAILER_CR,
65
66 /* A trailer LF must be found now, otherwise CHUNKE_BAD_CHUNK will be
67 signalled If this is an empty trailer CHUNKE_STOP will be signalled.
68 Otherwise the trailer will be broadcasted via Curl_client_write() and the
69 next state will be CHUNK_TRAILER */
70 CHUNK_TRAILER_POSTCR
71} ChunkyState;
72
73typedef enum {
74 CHUNKE_STOP = -1,
75 CHUNKE_OK = 0,
76 CHUNKE_TOO_LONG_HEX = 1,
77 CHUNKE_ILLEGAL_HEX,
78 CHUNKE_BAD_CHUNK,
79 CHUNKE_BAD_ENCODING,
80 CHUNKE_OUT_OF_MEMORY,
81 CHUNKE_PASSTHRU_ERROR, /* Curl_httpchunk_read() returns a CURLcode to use */
82 CHUNKE_LAST
83} CHUNKcode;
84
85const char *Curl_chunked_strerror(CHUNKcode code);
86
87struct Curl_chunker {
88 curl_off_t datasize;
89 ChunkyState state;
90 unsigned char hexindex;
91 char hexbuffer[ CHUNK_MAXNUM_LEN + 1]; /* +1 for null-terminator */
92};
93
94/* The following functions are defined in http_chunks.c */
95void Curl_httpchunk_init(struct Curl_easy *data);
96CHUNKcode Curl_httpchunk_read(struct Curl_easy *data, char *datap,
97 ssize_t length, ssize_t *wrote,
98 CURLcode *passthru);
99
100#endif /* HEADER_CURL_HTTP_CHUNKS_H */
101