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/*
* libmedia-thumbnail
*
* Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd. All rights reserved.
*
* Contact: Hyunjun Ko <zzoon.ko@samsung.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "md5.h"
#include <string.h>
#include <alloca.h>
#include <media-util-err.h>
static const char ACCEPTABLE_URI_CHARS[96] = {
/* ! " # $ % & ' ( ) * + , - . / */
0x00, 0x3F, 0x20, 0x20, 0x28, 0x00, 0x2C, 0x3F, 0x3F, 0x3F, 0x3F, 0x2A,
0x28, 0x3F, 0x3F, 0x1C,
/* 0 1 2 3 4 5 6 7 8 9 : ; < = > ? */
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x38, 0x20,
0x20, 0x2C, 0x20, 0x20,
/* @ A B C D E F G H I J K L M N O */
0x38, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F,
/* P Q R S T U V W X Y Z [ \ ] ^ _ */
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x20,
0x20, 0x20, 0x20, 0x3F,
/* ` a b c d e f g h i j k l m n o */
0x20, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F,
/* p q r s t u v w x y z { | } ~ DEL */
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x20,
0x20, 0x20, 0x3F, 0x20
};
char *_media_thumb_generate_hash_name(const char *file)
{
int n;
MD5_CTX ctx;
static char md5out[(2 * MD5_HASHBYTES) + 1];
unsigned char hash[MD5_HASHBYTES];
static const char hex[] = "0123456789abcdef";
char *uri;
char *t;
const unsigned char *c;
int length;
if (!file) {
return NULL;
}
length = 3 * strlen(file) + 9;
memset(md5out, 0, sizeof(md5out));
#define _check_uri_char(c) \
((c) >= 32 && (c) < 128 && (ACCEPTABLE_URI_CHARS[(c) - 32] & 0x08))
uri = alloca(length);
if (uri == NULL) {
return NULL;
}
strncpy(uri, "file://", length);
uri[length - 1] = '\0';
t = uri + sizeof("file://") - 1;
for (c = (const unsigned char *)file; *c != '\0'; c++) {
if (!_check_uri_char(*c)) {
*t++ = '%';
*t++ = hex[*c >> 4];
*t++ = hex[*c & 15];
} else {
*t++ = *c;
}
}
*t = '\0';
#undef _check_uri_char
memset(&ctx, 0x00, sizeof(MD5_CTX));
MD5Init(&ctx);
MD5Update(&ctx, (unsigned char const *)uri, (unsigned)strlen(uri));
MD5Final(hash, &ctx);
for (n = 0; n < MD5_HASHBYTES; n++) {
md5out[2 * n] = hex[hash[n] >> 4];
md5out[2 * n + 1] = hex[hash[n] & 0x0f];
}
md5out[2 * n] = '\0';
return md5out;
}
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