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mime.c
2059 lines (1752 loc) · 53.6 KB
/
mime.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2020, 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.haxx.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.
*
***************************************************************************/
#include "curl_setup.h"
#include <curl/curl.h>
#include "mime.h"
#include "non-ascii.h"
#include "warnless.h"
#include "urldata.h"
#include "sendf.h"
#if (!defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_MIME)) || \
!defined(CURL_DISABLE_SMTP) || !defined(CURL_DISABLE_IMAP)
#if defined(HAVE_LIBGEN_H) && defined(HAVE_BASENAME)
#include <libgen.h>
#endif
#include "rand.h"
#include "slist.h"
#include "strcase.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
#ifdef WIN32
# ifndef R_OK
# define R_OK 4
# endif
#endif
#define READ_ERROR ((size_t) -1)
#define STOP_FILLING ((size_t) -2)
static size_t mime_subparts_read(char *buffer, size_t size, size_t nitems,
void *instream, bool *hasread);
/* Encoders. */
static size_t encoder_nop_read(char *buffer, size_t size, bool ateof,
curl_mimepart *part);
static curl_off_t encoder_nop_size(curl_mimepart *part);
static size_t encoder_7bit_read(char *buffer, size_t size, bool ateof,
curl_mimepart *part);
static size_t encoder_base64_read(char *buffer, size_t size, bool ateof,
curl_mimepart *part);
static curl_off_t encoder_base64_size(curl_mimepart *part);
static size_t encoder_qp_read(char *buffer, size_t size, bool ateof,
curl_mimepart *part);
static curl_off_t encoder_qp_size(curl_mimepart *part);
static const struct mime_encoder encoders[] = {
{"binary", encoder_nop_read, encoder_nop_size},
{"8bit", encoder_nop_read, encoder_nop_size},
{"7bit", encoder_7bit_read, encoder_nop_size},
{"base64", encoder_base64_read, encoder_base64_size},
{"quoted-printable", encoder_qp_read, encoder_qp_size},
{ZERO_NULL, ZERO_NULL, ZERO_NULL}
};
/* Base64 encoding table */
static const char base64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/* Quoted-printable character class table.
*
* We cannot rely on ctype functions since quoted-printable input data
* is assumed to be ascii-compatible, even on non-ascii platforms. */
#define QP_OK 1 /* Can be represented by itself. */
#define QP_SP 2 /* Space or tab. */
#define QP_CR 3 /* Carriage return. */
#define QP_LF 4 /* Line-feed. */
static const unsigned char qp_class[] = {
0, 0, 0, 0, 0, 0, 0, 0, /* 00 - 07 */
0, QP_SP, QP_LF, 0, 0, QP_CR, 0, 0, /* 08 - 0F */
0, 0, 0, 0, 0, 0, 0, 0, /* 10 - 17 */
0, 0, 0, 0, 0, 0, 0, 0, /* 18 - 1F */
QP_SP, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, /* 20 - 27 */
QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, /* 28 - 2F */
QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, /* 30 - 37 */
QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, 0 , QP_OK, QP_OK, /* 38 - 3F */
QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, /* 40 - 47 */
QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, /* 48 - 4F */
QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, /* 50 - 57 */
QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, /* 58 - 5F */
QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, /* 60 - 67 */
QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, /* 68 - 6F */
QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, /* 70 - 77 */
QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, QP_OK, 0, /* 78 - 7F */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 80 - 8F */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 90 - 9F */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* A0 - AF */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* B0 - BF */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* C0 - CF */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* D0 - DF */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* E0 - EF */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 /* F0 - FF */
};
/* Binary --> hexadecimal ASCII table. */
static const char aschex[] =
"\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x41\x42\x43\x44\x45\x46";
#ifndef __VMS
#define filesize(name, stat_data) (stat_data.st_size)
#define fopen_read fopen
#else
#include <fabdef.h>
/*
* get_vms_file_size does what it takes to get the real size of the file
*
* For fixed files, find out the size of the EOF block and adjust.
*
* For all others, have to read the entire file in, discarding the contents.
* Most posted text files will be small, and binary files like zlib archives
* and CD/DVD images should be either a STREAM_LF format or a fixed format.
*
*/
curl_off_t VmsRealFileSize(const char *name,
const struct_stat *stat_buf)
{
char buffer[8192];
curl_off_t count;
int ret_stat;
FILE * file;
file = fopen(name, FOPEN_READTEXT); /* VMS */
if(file == NULL)
return 0;
count = 0;
ret_stat = 1;
while(ret_stat > 0) {
ret_stat = fread(buffer, 1, sizeof(buffer), file);
if(ret_stat != 0)
count += ret_stat;
}
fclose(file);
return count;
}
/*
*
* VmsSpecialSize checks to see if the stat st_size can be trusted and
* if not to call a routine to get the correct size.
*
*/
static curl_off_t VmsSpecialSize(const char *name,
const struct_stat *stat_buf)
{
switch(stat_buf->st_fab_rfm) {
case FAB$C_VAR:
case FAB$C_VFC:
return VmsRealFileSize(name, stat_buf);
break;
default:
return stat_buf->st_size;
}
}
#define filesize(name, stat_data) VmsSpecialSize(name, &stat_data)
/*
* vmsfopenread
*
* For upload to work as expected on VMS, different optional
* parameters must be added to the fopen command based on
* record format of the file.
*
*/
static FILE * vmsfopenread(const char *file, const char *mode)
{
struct_stat statbuf;
int result;
result = stat(file, &statbuf);
switch(statbuf.st_fab_rfm) {
case FAB$C_VAR:
case FAB$C_VFC:
case FAB$C_STMCR:
return fopen(file, FOPEN_READTEXT); /* VMS */
break;
default:
return fopen(file, FOPEN_READTEXT, "rfm=stmlf", "ctx=stm");
}
}
#define fopen_read vmsfopenread
#endif
#ifndef HAVE_BASENAME
/*
(Quote from The Open Group Base Specifications Issue 6 IEEE Std 1003.1, 2004
Edition)
The basename() function shall take the pathname pointed to by path and
return a pointer to the final component of the pathname, deleting any
trailing '/' characters.
If the string pointed to by path consists entirely of the '/' character,
basename() shall return a pointer to the string "/". If the string pointed
to by path is exactly "//", it is implementation-defined whether '/' or "//"
is returned.
If path is a null pointer or points to an empty string, basename() shall
return a pointer to the string ".".
The basename() function may modify the string pointed to by path, and may
return a pointer to static storage that may then be overwritten by a
subsequent call to basename().
The basename() function need not be reentrant. A function that is not
required to be reentrant is not required to be thread-safe.
*/
static char *Curl_basename(char *path)
{
/* Ignore all the details above for now and make a quick and simple
implementation here */
char *s1;
char *s2;
s1 = strrchr(path, '/');
s2 = strrchr(path, '\\');
if(s1 && s2) {
path = (s1 > s2? s1 : s2) + 1;
}
else if(s1)
path = s1 + 1;
else if(s2)
path = s2 + 1;
return path;
}
#define basename(x) Curl_basename((x))
#endif
/* Set readback state. */
static void mimesetstate(struct mime_state *state,
enum mimestate tok, void *ptr)
{
state->state = tok;
state->ptr = ptr;
state->offset = 0;
}
/* Escape header string into allocated memory. */
static char *escape_string(const char *src)
{
size_t bytecount = 0;
size_t i;
char *dst;
for(i = 0; src[i]; i++)
if(src[i] == '"' || src[i] == '\\')
bytecount++;
bytecount += i;
dst = malloc(bytecount + 1);
if(!dst)
return NULL;
for(i = 0; *src; src++) {
if(*src == '"' || *src == '\\')
dst[i++] = '\\';
dst[i++] = *src;
}
dst[i] = '\0';
return dst;
}
/* Check if header matches. */
static char *match_header(struct curl_slist *hdr, const char *lbl, size_t len)
{
char *value = NULL;
if(strncasecompare(hdr->data, lbl, len) && hdr->data[len] == ':')
for(value = hdr->data + len + 1; *value == ' '; value++)
;
return value;
}
/* Get a header from an slist. */
static char *search_header(struct curl_slist *hdrlist, const char *hdr)
{
size_t len = strlen(hdr);
char *value = NULL;
for(; !value && hdrlist; hdrlist = hdrlist->next)
value = match_header(hdrlist, hdr, len);
return value;
}
static char *strippath(const char *fullfile)
{
char *filename;
char *base;
filename = strdup(fullfile); /* duplicate since basename() may ruin the
buffer it works on */
if(!filename)
return NULL;
base = strdup(basename(filename));
free(filename); /* free temporary buffer */
return base; /* returns an allocated string or NULL ! */
}
/* Initialize data encoder state. */
static void cleanup_encoder_state(struct mime_encoder_state *p)
{
p->pos = 0;
p->bufbeg = 0;
p->bufend = 0;
}
/* Dummy encoder. This is used for 8bit and binary content encodings. */
static size_t encoder_nop_read(char *buffer, size_t size, bool ateof,
struct curl_mimepart *part)
{
struct mime_encoder_state *st = &part->encstate;
size_t insize = st->bufend - st->bufbeg;
(void) ateof;
if(!size)
return STOP_FILLING;
if(size > insize)
size = insize;
if(size)
memcpy(buffer, st->buf + st->bufbeg, size);
st->bufbeg += size;
return size;
}
static curl_off_t encoder_nop_size(curl_mimepart *part)
{
return part->datasize;
}
/* 7bit encoder: the encoder is just a data validity check. */
static size_t encoder_7bit_read(char *buffer, size_t size, bool ateof,
curl_mimepart *part)
{
struct mime_encoder_state *st = &part->encstate;
size_t cursize = st->bufend - st->bufbeg;
(void) ateof;
if(!size)
return STOP_FILLING;
if(size > cursize)
size = cursize;
for(cursize = 0; cursize < size; cursize++) {
*buffer = st->buf[st->bufbeg];
if(*buffer++ & 0x80)
return cursize? cursize: READ_ERROR;
st->bufbeg++;
}
return cursize;
}
/* Base64 content encoder. */
static size_t encoder_base64_read(char *buffer, size_t size, bool ateof,
curl_mimepart *part)
{
struct mime_encoder_state *st = &part->encstate;
size_t cursize = 0;
int i;
char *ptr = buffer;
while(st->bufbeg < st->bufend) {
/* Line full ? */
if(st->pos > MAX_ENCODED_LINE_LENGTH - 4) {
/* Yes, we need 2 characters for CRLF. */
if(size < 2) {
if(!cursize)
return STOP_FILLING;
break;
}
*ptr++ = '\r';
*ptr++ = '\n';
st->pos = 0;
cursize += 2;
size -= 2;
}
/* Be sure there is enough space and input data for a base64 group. */
if(size < 4) {
if(!cursize)
return STOP_FILLING;
break;
}
if(st->bufend - st->bufbeg < 3)
break;
/* Encode three bytes as four characters. */
i = st->buf[st->bufbeg++] & 0xFF;
i = (i << 8) | (st->buf[st->bufbeg++] & 0xFF);
i = (i << 8) | (st->buf[st->bufbeg++] & 0xFF);
*ptr++ = base64[(i >> 18) & 0x3F];
*ptr++ = base64[(i >> 12) & 0x3F];
*ptr++ = base64[(i >> 6) & 0x3F];
*ptr++ = base64[i & 0x3F];
cursize += 4;
st->pos += 4;
size -= 4;
}
/* If at eof, we have to flush the buffered data. */
if(ateof) {
if(size < 4) {
if(!cursize)
return STOP_FILLING;
}
else {
/* Buffered data size can only be 0, 1 or 2. */
ptr[2] = ptr[3] = '=';
i = 0;
switch(st->bufend - st->bufbeg) {
case 2:
i = (st->buf[st->bufbeg + 1] & 0xFF) << 8;
/* FALLTHROUGH */
case 1:
i |= (st->buf[st->bufbeg] & 0xFF) << 16;
ptr[0] = base64[(i >> 18) & 0x3F];
ptr[1] = base64[(i >> 12) & 0x3F];
if(++st->bufbeg != st->bufend) {
ptr[2] = base64[(i >> 6) & 0x3F];
st->bufbeg++;
}
cursize += 4;
st->pos += 4;
break;
}
}
}
#ifdef CURL_DOES_CONVERSIONS
/* This is now textual data, Convert character codes. */
if(part->easy && cursize) {
CURLcode result = Curl_convert_to_network(part->easy, buffer, cursize);
if(result)
return READ_ERROR;
}
#endif
return cursize;
}
static curl_off_t encoder_base64_size(curl_mimepart *part)
{
curl_off_t size = part->datasize;
if(size <= 0)
return size; /* Unknown size or no data. */
/* Compute base64 character count. */
size = 4 * (1 + (size - 1) / 3);
/* Effective character count must include CRLFs. */
return size + 2 * ((size - 1) / MAX_ENCODED_LINE_LENGTH);
}
/* Quoted-printable lookahead.
*
* Check if a CRLF or end of data is in input buffer at current position + n.
* Return -1 if more data needed, 1 if CRLF or end of data, else 0.
*/
static int qp_lookahead_eol(struct mime_encoder_state *st, int ateof, size_t n)
{
n += st->bufbeg;
if(n >= st->bufend && ateof)
return 1;
if(n + 2 > st->bufend)
return ateof? 0: -1;
if(qp_class[st->buf[n] & 0xFF] == QP_CR &&
qp_class[st->buf[n + 1] & 0xFF] == QP_LF)
return 1;
return 0;
}
/* Quoted-printable encoder. */
static size_t encoder_qp_read(char *buffer, size_t size, bool ateof,
curl_mimepart *part)
{
struct mime_encoder_state *st = &part->encstate;
char *ptr = buffer;
size_t cursize = 0;
int softlinebreak;
char buf[4];
/* On all platforms, input is supposed to be ASCII compatible: for this
reason, we use hexadecimal ASCII codes in this function rather than
character constants that can be interpreted as non-ascii on some
platforms. Preserve ASCII encoding on output too. */
while(st->bufbeg < st->bufend) {
size_t len = 1;
size_t consumed = 1;
int i = st->buf[st->bufbeg];
buf[0] = (char) i;
buf[1] = aschex[(i >> 4) & 0xF];
buf[2] = aschex[i & 0xF];
switch(qp_class[st->buf[st->bufbeg] & 0xFF]) {
case QP_OK: /* Not a special character. */
break;
case QP_SP: /* Space or tab. */
/* Spacing must be escaped if followed by CRLF. */
switch(qp_lookahead_eol(st, ateof, 1)) {
case -1: /* More input data needed. */
return cursize;
case 0: /* No encoding needed. */
break;
default: /* CRLF after space or tab. */
buf[0] = '\x3D'; /* '=' */
len = 3;
break;
}
break;
case QP_CR: /* Carriage return. */
/* If followed by a line-feed, output the CRLF pair.
Else escape it. */
switch(qp_lookahead_eol(st, ateof, 0)) {
case -1: /* Need more data. */
return cursize;
case 1: /* CRLF found. */
buf[len++] = '\x0A'; /* Append '\n'. */
consumed = 2;
break;
default: /* Not followed by LF: escape. */
buf[0] = '\x3D'; /* '=' */
len = 3;
break;
}
break;
default: /* Character must be escaped. */
buf[0] = '\x3D'; /* '=' */
len = 3;
break;
}
/* Be sure the encoded character fits within maximum line length. */
if(buf[len - 1] != '\x0A') { /* '\n' */
softlinebreak = st->pos + len > MAX_ENCODED_LINE_LENGTH;
if(!softlinebreak && st->pos + len == MAX_ENCODED_LINE_LENGTH) {
/* We may use the current line only if end of data or followed by
a CRLF. */
switch(qp_lookahead_eol(st, ateof, consumed)) {
case -1: /* Need more data. */
return cursize;
case 0: /* Not followed by a CRLF. */
softlinebreak = 1;
break;
}
}
if(softlinebreak) {
strcpy(buf, "\x3D\x0D\x0A"); /* "=\r\n" */
len = 3;
consumed = 0;
}
}
/* If the output buffer would overflow, do not store. */
if(len > size) {
if(!cursize)
return STOP_FILLING;
break;
}
/* Append to output buffer. */
memcpy(ptr, buf, len);
cursize += len;
ptr += len;
size -= len;
st->pos += len;
if(buf[len - 1] == '\x0A') /* '\n' */
st->pos = 0;
st->bufbeg += consumed;
}
return cursize;
}
static curl_off_t encoder_qp_size(curl_mimepart *part)
{
/* Determining the size can only be done by reading the data: unless the
data size is 0, we return it as unknown (-1). */
return part->datasize? -1: 0;
}
/* In-memory data callbacks. */
/* Argument is a pointer to the mime part. */
static size_t mime_mem_read(char *buffer, size_t size, size_t nitems,
void *instream)
{
curl_mimepart *part = (curl_mimepart *) instream;
size_t sz = curlx_sotouz(part->datasize - part->state.offset);
(void) size; /* Always 1.*/
if(!nitems)
return STOP_FILLING;
if(sz > nitems)
sz = nitems;
if(sz)
memcpy(buffer, part->data + curlx_sotouz(part->state.offset), sz);
return sz;
}
static int mime_mem_seek(void *instream, curl_off_t offset, int whence)
{
curl_mimepart *part = (curl_mimepart *) instream;
switch(whence) {
case SEEK_CUR:
offset += part->state.offset;
break;
case SEEK_END:
offset += part->datasize;
break;
}
if(offset < 0 || offset > part->datasize)
return CURL_SEEKFUNC_FAIL;
part->state.offset = offset;
return CURL_SEEKFUNC_OK;
}
static void mime_mem_free(void *ptr)
{
Curl_safefree(((curl_mimepart *) ptr)->data);
}
/* Named file callbacks. */
/* Argument is a pointer to the mime part. */
static int mime_open_file(curl_mimepart *part)
{
/* Open a MIMEKIND_FILE part. */
if(part->fp)
return 0;
part->fp = fopen_read(part->data, "rb");
return part->fp? 0: -1;
}
static size_t mime_file_read(char *buffer, size_t size, size_t nitems,
void *instream)
{
curl_mimepart *part = (curl_mimepart *) instream;
if(!nitems)
return STOP_FILLING;
if(mime_open_file(part))
return READ_ERROR;
return fread(buffer, size, nitems, part->fp);
}
static int mime_file_seek(void *instream, curl_off_t offset, int whence)
{
curl_mimepart *part = (curl_mimepart *) instream;
if(whence == SEEK_SET && !offset && !part->fp)
return CURL_SEEKFUNC_OK; /* Not open: implicitly already at BOF. */
if(mime_open_file(part))
return CURL_SEEKFUNC_FAIL;
return fseek(part->fp, (long) offset, whence)?
CURL_SEEKFUNC_CANTSEEK: CURL_SEEKFUNC_OK;
}
static void mime_file_free(void *ptr)
{
curl_mimepart *part = (curl_mimepart *) ptr;
if(part->fp) {
fclose(part->fp);
part->fp = NULL;
}
Curl_safefree(part->data);
part->data = NULL;
}
/* Subparts callbacks. */
/* Argument is a pointer to the mime structure. */
/* Readback a byte string segment. */
static size_t readback_bytes(struct mime_state *state,
char *buffer, size_t bufsize,
const char *bytes, size_t numbytes,
const char *trail)
{
size_t sz;
size_t offset = curlx_sotouz(state->offset);
if(numbytes > offset) {
sz = numbytes - offset;
bytes += offset;
}
else {
size_t tsz = strlen(trail);
sz = offset - numbytes;
if(sz >= tsz)
return 0;
bytes = trail + sz;
sz = tsz - sz;
}
if(sz > bufsize)
sz = bufsize;
memcpy(buffer, bytes, sz);
state->offset += sz;
return sz;
}
/* Read a non-encoded part content. */
static size_t read_part_content(curl_mimepart *part,
char *buffer, size_t bufsize, bool *hasread)
{
size_t sz = 0;
switch(part->lastreadstatus) {
case 0:
case CURL_READFUNC_ABORT:
case CURL_READFUNC_PAUSE:
case READ_ERROR:
return part->lastreadstatus;
default:
break;
}
/* If we can determine we are at end of part data, spare a read. */
if(part->datasize != (curl_off_t) -1 &&
part->state.offset >= part->datasize) {
/* sz is already zero. */
}
else {
switch(part->kind) {
case MIMEKIND_MULTIPART:
/*
* Cannot be processed as other kinds since read function requires
* an additional parameter and is highly recursive.
*/
sz = mime_subparts_read(buffer, 1, bufsize, part->arg, hasread);
break;
case MIMEKIND_FILE:
if(part->fp && feof(part->fp))
break; /* At EOF. */
/* FALLTHROUGH */
default:
if(part->readfunc) {
if(!(part->flags & MIME_FAST_READ)) {
if(*hasread)
return STOP_FILLING;
*hasread = TRUE;
}
sz = part->readfunc(buffer, 1, bufsize, part->arg);
}
break;
}
}
switch(sz) {
case STOP_FILLING:
break;
case 0:
case CURL_READFUNC_ABORT:
case CURL_READFUNC_PAUSE:
case READ_ERROR:
part->lastreadstatus = sz;
break;
default:
part->state.offset += sz;
part->lastreadstatus = sz;
break;
}
return sz;
}
/* Read and encode part content. */
static size_t read_encoded_part_content(curl_mimepart *part, char *buffer,
size_t bufsize, bool *hasread)
{
struct mime_encoder_state *st = &part->encstate;
size_t cursize = 0;
size_t sz;
bool ateof = FALSE;
for(;;) {
if(st->bufbeg < st->bufend || ateof) {
/* Encode buffered data. */
sz = part->encoder->encodefunc(buffer, bufsize, ateof, part);
switch(sz) {
case 0:
if(ateof)
return cursize;
break;
case READ_ERROR:
case STOP_FILLING:
return cursize? cursize: sz;
default:
cursize += sz;
buffer += sz;
bufsize -= sz;
continue;
}
}
/* We need more data in input buffer. */
if(st->bufbeg) {
size_t len = st->bufend - st->bufbeg;
if(len)
memmove(st->buf, st->buf + st->bufbeg, len);
st->bufbeg = 0;
st->bufend = len;
}
if(st->bufend >= sizeof(st->buf))
return cursize? cursize: READ_ERROR; /* Buffer full. */
sz = read_part_content(part, st->buf + st->bufend,
sizeof(st->buf) - st->bufend, hasread);
switch(sz) {
case 0:
ateof = TRUE;
break;
case CURL_READFUNC_ABORT:
case CURL_READFUNC_PAUSE:
case READ_ERROR:
case STOP_FILLING:
return cursize? cursize: sz;
default:
st->bufend += sz;
break;
}
}
/* NOTREACHED */
}
/* Readback a mime part. */
static size_t readback_part(curl_mimepart *part,
char *buffer, size_t bufsize, bool *hasread)
{
size_t cursize = 0;
#ifdef CURL_DOES_CONVERSIONS
char *convbuf = buffer;
#endif
/* Readback from part. */
while(bufsize) {
size_t sz = 0;
struct curl_slist *hdr = (struct curl_slist *) part->state.ptr;
switch(part->state.state) {
case MIMESTATE_BEGIN:
mimesetstate(&part->state,
(part->flags & MIME_BODY_ONLY)?
MIMESTATE_BODY: MIMESTATE_CURLHEADERS,
part->curlheaders);
break;
case MIMESTATE_USERHEADERS:
if(!hdr) {
mimesetstate(&part->state, MIMESTATE_EOH, NULL);
break;
}
if(match_header(hdr, "Content-Type", 12)) {
mimesetstate(&part->state, MIMESTATE_USERHEADERS, hdr->next);
break;
}
/* FALLTHROUGH */
case MIMESTATE_CURLHEADERS:
if(!hdr)
mimesetstate(&part->state, MIMESTATE_USERHEADERS, part->userheaders);
else {
sz = readback_bytes(&part->state, buffer, bufsize,
hdr->data, strlen(hdr->data), "\r\n");
if(!sz)
mimesetstate(&part->state, part->state.state, hdr->next);
}
break;
case MIMESTATE_EOH:
sz = readback_bytes(&part->state, buffer, bufsize, "\r\n", 2, "");
if(!sz)
mimesetstate(&part->state, MIMESTATE_BODY, NULL);
break;
case MIMESTATE_BODY:
#ifdef CURL_DOES_CONVERSIONS
if(part->easy && convbuf < buffer) {
CURLcode result = Curl_convert_to_network(part->easy, convbuf,
buffer - convbuf);
if(result)
return READ_ERROR;
convbuf = buffer;
}
#endif
cleanup_encoder_state(&part->encstate);
mimesetstate(&part->state, MIMESTATE_CONTENT, NULL);
break;
case MIMESTATE_CONTENT:
if(part->encoder)
sz = read_encoded_part_content(part, buffer, bufsize, hasread);
else
sz = read_part_content(part, buffer, bufsize, hasread);
switch(sz) {
case 0:
mimesetstate(&part->state, MIMESTATE_END, NULL);
/* Try sparing open file descriptors. */
if(part->kind == MIMEKIND_FILE && part->fp) {
fclose(part->fp);
part->fp = NULL;
}
/* FALLTHROUGH */
case CURL_READFUNC_ABORT:
case CURL_READFUNC_PAUSE:
case READ_ERROR:
case STOP_FILLING:
return cursize? cursize: sz;
}
break;
case MIMESTATE_END:
return cursize;
default:
break; /* Other values not in part state. */
}
/* Bump buffer and counters according to read size. */
cursize += sz;
buffer += sz;
bufsize -= sz;
}
#ifdef CURL_DOES_CONVERSIONS
if(part->easy && convbuf < buffer &&
part->state.state < MIMESTATE_BODY) {
CURLcode result = Curl_convert_to_network(part->easy, convbuf,
buffer - convbuf);
if(result)
return READ_ERROR;
}
#endif
return cursize;