1/* 2 * Copyright (c) 2010 Mans Rullgard 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#include <stdio.h> 22#include "libavutil/avstring.h" 23#include "libavutil/md5.h" 24#include "libavutil/mem.h" 25#include "libavutil/error.h" 26#include "avformat.h" 27#include "avio.h" 28#include "url.h" 29 30struct MD5Context { 31 struct AVMD5 *md5; 32}; 33 34static int md5_open(URLContext *h, const char *filename, int flags) 35{ 36 struct MD5Context *c = h->priv_data; 37 38 if (!(flags & AVIO_FLAG_WRITE)) 39 return AVERROR(EINVAL); 40 41 c->md5 = av_md5_alloc(); 42 if (!c->md5) 43 return AVERROR(ENOMEM); 44 av_md5_init(c->md5); 45 46 return 0; 47} 48 49static int md5_write(URLContext *h, const unsigned char *buf, int size) 50{ 51 struct MD5Context *c = h->priv_data; 52 av_md5_update(c->md5, buf, size); 53 return size; 54} 55 56static int md5_close(URLContext *h) 57{ 58 struct MD5Context *c = h->priv_data; 59 const char *filename = h->filename; 60 uint8_t md5[16], buf[64]; 61 URLContext *out; 62 int i, err = 0; 63 64 av_md5_final(c->md5, md5); 65 for (i = 0; i < sizeof(md5); i++) 66 snprintf(buf + i*2, 3, "%02x", md5[i]); 67 buf[i*2] = '\n'; 68 69 av_strstart(filename, "md5:", &filename); 70 71 if (*filename) { 72 err = ffurl_open(&out, filename, AVIO_FLAG_WRITE, 73 &h->interrupt_callback, NULL); 74 if (err) 75 return err; 76 err = ffurl_write(out, buf, i*2+1); 77 ffurl_close(out); 78 } else { 79 if (fwrite(buf, 1, i*2+1, stdout) < i*2+1) 80 err = AVERROR(errno); 81 } 82 83 av_freep(&c->md5); 84 85 return err; 86} 87 88 89URLProtocol ff_md5_protocol = { 90 .name = "md5", 91 .url_open = md5_open, 92 .url_write = md5_write, 93 .url_close = md5_close, 94 .priv_data_size = sizeof(struct MD5Context), 95}; 96