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#ifndef HEADER_CURL_HTTP_CHUNKS_H
#define HEADER_CURL_HTTP_CHUNKS_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 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 https://curl.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.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#ifndef CURL_DISABLE_HTTP
#include "dynbuf.h"
struct connectdata;
/*
* The longest possible hexadecimal number we support in a chunked transfer.
* Neither RFC2616 nor the later HTTP specs define a maximum chunk size.
* For 64-bit curl_off_t we support 16 digits. For 32-bit, 8 digits.
*/
#define CHUNK_MAXNUM_LEN (SIZEOF_CURL_OFF_T * 2)
typedef enum {
/* await and buffer all hexadecimal digits until we get one that is not a
hexadecimal digit. When done, we go CHUNK_LF */
CHUNK_HEX,
/* wait for LF, ignore all else */
CHUNK_LF,
/* We eat the amount of data specified. When done, we move on to the
POST_CR state. */
CHUNK_DATA,
/* POSTLF should get a CR and then a LF and nothing else, then move back to
HEX as the CRLF combination marks the end of a chunk. A missing CR is no
big deal. */
CHUNK_POSTLF,
/* Used to mark that we are out of the game. NOTE: that there is a
'datasize' field in the struct that will tell how many bytes that were
not passed to the client in the end of the last buffer! */
CHUNK_STOP,
/* At this point optional trailer headers can be found, unless the next line
is CRLF */
CHUNK_TRAILER,
/* A trailer CR has been found - next state is CHUNK_TRAILER_POSTCR.
Next char must be a LF */
CHUNK_TRAILER_CR,
/* A trailer LF must be found now, otherwise CHUNKE_BAD_CHUNK will be
signalled If this is an empty trailer CHUNKE_STOP will be signalled.
Otherwise the trailer will be broadcasted via Curl_client_write() and the
next state will be CHUNK_TRAILER */
CHUNK_TRAILER_POSTCR,
/* Successfully de-chunked everything */
CHUNK_DONE,
/* Failed on seeing a bad or not correctly terminated chunk */
CHUNK_FAILED
} ChunkyState;
typedef enum {
CHUNKE_OK = 0,
CHUNKE_TOO_LONG_HEX = 1,
CHUNKE_ILLEGAL_HEX,
CHUNKE_BAD_CHUNK,
CHUNKE_BAD_ENCODING,
CHUNKE_OUT_OF_MEMORY,
CHUNKE_PASSTHRU_ERROR /* Curl_httpchunk_read() returns a CURLcode to use */
} CHUNKcode;
struct Curl_chunker {
curl_off_t datasize;
ChunkyState state;
CHUNKcode last_code;
struct dynbuf trailer; /* for chunked-encoded trailer */
unsigned char hexindex;
char hexbuffer[CHUNK_MAXNUM_LEN + 1]; /* +1 for null-terminator */
BIT(ignore_body); /* never write response body data */
};
/* The following functions are defined in http_chunks.c */
void Curl_httpchunk_init(struct Curl_easy *data, struct Curl_chunker *ch,
bool ignore_body);
void Curl_httpchunk_free(struct Curl_easy *data, struct Curl_chunker *ch);
void Curl_httpchunk_reset(struct Curl_easy *data, struct Curl_chunker *ch,
bool ignore_body);
/*
* Read BODY bytes in HTTP/1.1 chunked encoding from `buf` and return
* the amount of bytes consumed. The actual response bytes and trailer
* headers are written out to the client.
* On success, this will consume all bytes up to the end of the response,
* e.g. the last chunk, has been processed.
* @param data the transfer involved
* @param ch the chunker instance keeping state across calls
* @param buf the response data
* @param blen amount of bytes in `buf`
* @param pconsumed on successful return, the number of bytes in `buf`
* consumed
*
* This function always uses ASCII hex values to accommodate non-ASCII hosts.
* For example, 0x0d and 0x0a are used instead of '\r' and '\n'.
*/
CURLcode Curl_httpchunk_read(struct Curl_easy *data, struct Curl_chunker *ch,
char *buf, size_t blen, size_t *pconsumed);
/**
* @return TRUE iff chunked decoded has finished successfully.
*/
bool Curl_httpchunk_is_done(struct Curl_easy *data, struct Curl_chunker *ch);
extern const struct Curl_cwtype Curl_httpchunk_unencoder;
extern const struct Curl_crtype Curl_httpchunk_encoder;
/**
* Add a transfer-encoding "chunked" reader to the transfers reader stack
*/
CURLcode Curl_httpchunk_add_reader(struct Curl_easy *data);
#endif /* !CURL_DISABLE_HTTP */
#endif /* HEADER_CURL_HTTP_CHUNKS_H */
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