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mime.h
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#ifndef HEADER_CURL_MIME_H
#define HEADER_CURL_MIME_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <[email protected]>, 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
*
***************************************************************************/
#include "curl_setup.h"
#define MIME_BOUNDARY_DASHES 24 /* leading boundary dashes */
#define MIME_RAND_BOUNDARY_CHARS 16 /* Nb. of random boundary chars. */
#define MAX_ENCODED_LINE_LENGTH 76 /* Maximum encoded line length. */
#define ENCODING_BUFFER_SIZE 256 /* Encoding temp buffers size. */
/* Part flags. */
#define MIME_USERHEADERS_OWNER (1 << 0)
#define MIME_BODY_ONLY (1 << 1)
#define MIME_FAST_READ (1 << 2)
#define FILE_CONTENTTYPE_DEFAULT "application/octet-stream"
#define MULTIPART_CONTENTTYPE_DEFAULT "multipart/mixed"
#define DISPOSITION_DEFAULT "attachment"
/* Part source kinds. */
enum mimekind {
MIMEKIND_NONE = 0, /* Part not set. */
MIMEKIND_DATA, /* Allocated mime data. */
MIMEKIND_FILE, /* Data from file. */
MIMEKIND_CALLBACK, /* Data from `read' callback. */
MIMEKIND_MULTIPART, /* Data is a mime subpart. */
MIMEKIND_LAST
};
/* Readback state tokens. */
enum mimestate {
MIMESTATE_BEGIN, /* Readback has not yet started. */
MIMESTATE_CURLHEADERS, /* In curl-generated headers. */
MIMESTATE_USERHEADERS, /* In caller's supplied headers. */
MIMESTATE_EOH, /* End of headers. */
MIMESTATE_BODY, /* Placeholder. */
MIMESTATE_BOUNDARY1, /* In boundary prefix. */
MIMESTATE_BOUNDARY2, /* In boundary. */
MIMESTATE_CONTENT, /* In content. */
MIMESTATE_END, /* End of part reached. */
MIMESTATE_LAST
};
/* Mime headers strategies. */
enum mimestrategy {
MIMESTRATEGY_MAIL, /* Mime mail. */
MIMESTRATEGY_FORM, /* HTTP post form. */
MIMESTRATEGY_LAST
};
/* Content transfer encoder. */
struct mime_encoder {
const char * name; /* Encoding name. */
size_t (*encodefunc)(char *buffer, size_t size, bool ateof,
curl_mimepart *part); /* Encoded read. */
curl_off_t (*sizefunc)(curl_mimepart *part); /* Encoded size. */
};
/* Content transfer encoder state. */
struct mime_encoder_state {
size_t pos; /* Position on output line. */
size_t bufbeg; /* Next data index in input buffer. */
size_t bufend; /* First unused byte index in input buffer. */
char buf[ENCODING_BUFFER_SIZE]; /* Input buffer. */
};
/* Mime readback state. */
struct mime_state {
enum mimestate state; /* Current state token. */
void *ptr; /* State-dependent pointer. */
curl_off_t offset; /* State-dependent offset. */
};
/* Boundary string length. */
#define MIME_BOUNDARY_LEN (MIME_BOUNDARY_DASHES + MIME_RAND_BOUNDARY_CHARS)
/* A mime multipart. */
struct curl_mime {
curl_mimepart *parent; /* Parent part. */
curl_mimepart *firstpart; /* First part. */
curl_mimepart *lastpart; /* Last part. */
char boundary[MIME_BOUNDARY_LEN + 1]; /* The part boundary. */
struct mime_state state; /* Current readback state. */
};
/* A mime part. */
struct curl_mimepart {
curl_mime *parent; /* Parent mime structure. */
curl_mimepart *nextpart; /* Forward linked list. */
enum mimekind kind; /* The part kind. */
unsigned int flags; /* Flags. */
char *data; /* Memory data or file name. */
curl_read_callback readfunc; /* Read function. */
curl_seek_callback seekfunc; /* Seek function. */
curl_free_callback freefunc; /* Argument free function. */
void *arg; /* Argument to callback functions. */
FILE *fp; /* File pointer. */
struct curl_slist *curlheaders; /* Part headers. */
struct curl_slist *userheaders; /* Part headers. */
char *mimetype; /* Part mime type. */
char *filename; /* Remote file name. */
char *name; /* Data name. */
curl_off_t datasize; /* Expected data size. */
struct mime_state state; /* Current readback state. */
const struct mime_encoder *encoder; /* Content data encoder. */
struct mime_encoder_state encstate; /* Data encoder state. */
size_t lastreadstatus; /* Last read callback returned status. */
};
CURLcode Curl_mime_add_header(struct curl_slist **slp, const char *fmt, ...);
#if !defined(CURL_DISABLE_MIME) && (!defined(CURL_DISABLE_HTTP) || \
!defined(CURL_DISABLE_SMTP) || \
!defined(CURL_DISABLE_IMAP))
/* Prototypes. */
void Curl_mime_initpart(struct curl_mimepart *part);
void Curl_mime_cleanpart(struct curl_mimepart *part);
CURLcode Curl_mime_duppart(struct Curl_easy *data,
struct curl_mimepart *dst,
const curl_mimepart *src);
CURLcode Curl_mime_set_subparts(struct curl_mimepart *part,
struct curl_mime *subparts,
int take_ownership);
CURLcode Curl_mime_prepare_headers(struct Curl_easy *data,
struct curl_mimepart *part,
const char *contenttype,
const char *disposition,
enum mimestrategy strategy);
curl_off_t Curl_mime_size(struct curl_mimepart *part);
size_t Curl_mime_read(char *buffer, size_t size, size_t nitems,
void *instream);
CURLcode Curl_mime_rewind(struct curl_mimepart *part);
const char *Curl_mime_contenttype(const char *filename);
void Curl_mime_unpause(struct curl_mimepart *part);
#else
/* if disabled */
#define Curl_mime_initpart(x)
#define Curl_mime_cleanpart(x)
#define Curl_mime_duppart(x,y,z) CURLE_OK /* Nothing to duplicate. Succeed */
#define Curl_mime_set_subparts(a,b,c) CURLE_NOT_BUILT_IN
#define Curl_mime_prepare_headers(a,b,c,d,e) CURLE_NOT_BUILT_IN
#define Curl_mime_size(x) (curl_off_t) -1
#define Curl_mime_read NULL
#define Curl_mime_rewind(x) ((void)x, CURLE_NOT_BUILT_IN)
#define Curl_mime_unpause(x)
#endif
#endif /* HEADER_CURL_MIME_H */