FFmpeg/libavformat/md5proto.c
Martin Storsjö da18e918a4 md5: Allocate a normal private context for the opaque md5 context pointer
This avoids having to overestimate the md5 context size, which
isn't known beforehand, allowing us to use the new allocate functions
instead.

Signed-off-by: Martin Storsjö <martin@martin.st>
2012-10-11 23:35:29 +03:00

96 lines
2.5 KiB
C

/*
* Copyright (c) 2010 Mans Rullgard
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include "libavutil/avstring.h"
#include "libavutil/md5.h"
#include "libavutil/mem.h"
#include "libavutil/error.h"
#include "avformat.h"
#include "avio.h"
#include "url.h"
struct MD5Context {
struct AVMD5 *md5;
};
static int md5_open(URLContext *h, const char *filename, int flags)
{
struct MD5Context *c = h->priv_data;
if (!(flags & AVIO_FLAG_WRITE))
return AVERROR(EINVAL);
c->md5 = av_md5_alloc();
if (!c->md5)
return AVERROR(ENOMEM);
av_md5_init(c->md5);
return 0;
}
static int md5_write(URLContext *h, const unsigned char *buf, int size)
{
struct MD5Context *c = h->priv_data;
av_md5_update(c->md5, buf, size);
return size;
}
static int md5_close(URLContext *h)
{
struct MD5Context *c = h->priv_data;
const char *filename = h->filename;
uint8_t md5[16], buf[64];
URLContext *out;
int i, err = 0;
av_md5_final(c->md5, md5);
for (i = 0; i < sizeof(md5); i++)
snprintf(buf + i*2, 3, "%02x", md5[i]);
buf[i*2] = '\n';
av_strstart(filename, "md5:", &filename);
if (*filename) {
err = ffurl_open(&out, filename, AVIO_FLAG_WRITE,
&h->interrupt_callback, NULL);
if (err)
return err;
err = ffurl_write(out, buf, i*2+1);
ffurl_close(out);
} else {
if (fwrite(buf, 1, i*2+1, stdout) < i*2+1)
err = AVERROR(errno);
}
av_freep(&c->md5);
return err;
}
URLProtocol ff_md5_protocol = {
.name = "md5",
.url_open = md5_open,
.url_write = md5_write,
.url_close = md5_close,
.priv_data_size = sizeof(struct MD5Context),
};