/*
  * Copyright (c) 2010 Mans Rullgard
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg 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.
  *
  * FFmpeg 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 FFmpeg; 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_whitelist(&out, filename, AVIO_FLAG_WRITE,
                                    &h->interrupt_callback, NULL,

                                    h->protocol_whitelist, h->protocol_blacklist, h);

         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;
 }
 
 

 const URLProtocol ff_md5_protocol = {

     .name                = "md5",
     .url_open            = md5_open,
     .url_write           = md5_write,
     .url_close           = md5_close,

     .priv_data_size      = sizeof(struct MD5Context),

 };