/*******************************************************************************
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* Copyright 2011-2013 Sergey Tarasevich
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*******************************************************************************/
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package com.nostra13.universalimageloader.cache.disc.naming;
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import com.nostra13.universalimageloader.utils.L;
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import java.math.BigInteger;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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/**
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* Names image file as MD5 hash of image URI
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*
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* @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
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* @since 1.4.0
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*/
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public class Md5FileNameGenerator implements FileNameGenerator {
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private static final String HASH_ALGORITHM = "MD5";
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private static final int RADIX = 10 + 26; // 10 digits + 26 letters
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@Override
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public String generate(String imageUri) {
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byte[] md5 = getMD5(imageUri.getBytes());
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BigInteger bi = new BigInteger(md5).abs();
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return bi.toString(RADIX);
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}
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private byte[] getMD5(byte[] data) {
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byte[] hash = null;
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try {
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MessageDigest digest = MessageDigest.getInstance(HASH_ALGORITHM);
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digest.update(data);
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hash = digest.digest();
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} catch (NoSuchAlgorithmException e) {
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L.e(e);
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}
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return hash;
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}
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}
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