static int mpjpeg_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret;
int size = parse_multipart_header(s);
if (size < 0)
return size;
ret = av_get_packet(s->pb, pkt, size);
if (ret < 0)
return ret;
// trailing empty line
avio_skip(s->pb, 2);
return 0;
}
static int mpjpeg_read_probe(AVProbeData *p)
{
AVIOContext *pb;
int ret = 0;
if (p->buf_size < 2 || p->buf[0] != '-' || p->buf[1] != '-')
return 0;
pb = avio_alloc_context(p->buf, p->buf_size, 0, NULL, NULL, NULL, NULL);
if (!pb)
return AVERROR(ENOMEM);
ret = (parse_multipart_header(pb, NULL)>0)?AVPROBE_SCORE_MAX:0;
av_free(pb);
return ret;
}
void request_parser::parse_multipart_content(request& req, const std::string& data)
{
std::string end = "\r\n\r\n";
std::string::size_type head_limit = data.find(end, 0);
if (head_limit == std::string::npos)
{
throw std::runtime_error("invalid part header");
}
std::string::size_type value_start = head_limit + end.size();
std::string value = data.substr(value_start, data.size() - value_start - 2);
multipart_header head = parse_multipart_header(req, data.substr(0, value_start));
if (head.filename.empty())
{
req.params.push_back(name_value(head.name, value));
}
else
{
req.uploads.push_back(multipart_content(head.name, head.filename, head.filetype, value));
}
}
static int mpjpeg_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int size;
int ret;
MPJPEGDemuxContext *mpjpeg = s->priv_data;
if (mpjpeg->boundary == NULL) {
uint8_t* boundary = NULL;
if (mpjpeg->strict_mime_boundary) {
boundary = mpjpeg_get_boundary(s->pb);
}
if (boundary != NULL) {
mpjpeg->boundary = boundary;
mpjpeg->searchstr = av_asprintf( "\r\n%s\r\n", boundary );
} else {
mpjpeg->boundary = av_strdup("--");
mpjpeg->searchstr = av_strdup("\r\n--");
}
if (!mpjpeg->boundary || !mpjpeg->searchstr) {
av_freep(&mpjpeg->boundary);
av_freep(&mpjpeg->searchstr);
return AVERROR(ENOMEM);
}
mpjpeg->searchstr_len = strlen(mpjpeg->searchstr);
}
ret = parse_multipart_header(s->pb, &size, mpjpeg->boundary, s);
if (ret < 0)
return ret;
if (size > 0) {
/* size has been provided to us in MIME header */
ret = av_get_packet(s->pb, pkt, size);
} else {
/* no size was given -- we read until the next boundary or end-of-file */
int remaining = 0, len;
const int read_chunk = 2048;
av_init_packet(pkt);
pkt->data = NULL;
pkt->size = 0;
pkt->pos = avio_tell(s->pb);
/* we may need to return as much as all we've read back to the buffer */
ffio_ensure_seekback(s->pb, read_chunk);
while ((ret = av_append_packet(s->pb, pkt, read_chunk - remaining)) >= 0) {
/* scan the new data */
char *start;
len = ret + remaining;
start = pkt->data + pkt->size - len;
do {
if (!memcmp(start, mpjpeg->searchstr, mpjpeg->searchstr_len)) {
// got the boundary! rewind the stream
avio_seek(s->pb, -(len-2), SEEK_CUR);
pkt->size -= (len-2);
return pkt->size;
}
len--;
start++;
} while (len >= mpjpeg->searchstr_len);
remaining = len;
}
/* error or EOF occurred */
if (ret == AVERROR_EOF) {
ret = pkt->size > 0 ? pkt->size : AVERROR_EOF;
} else {
av_packet_unref(pkt);
}
}
return ret;
}