1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <include/DataUriSource.h> 18 19 #include <net/base/data_url.h> 20 #include <googleurl/src/gurl.h> 21 22 23 namespace android { 24 25 DataUriSource::DataUriSource(const char *uri) : 26 mDataUri(uri), 27 mInited(NO_INIT) { 28 29 // Copy1: const char *uri -> String8 mDataUri. 30 std::string mimeTypeStr, unusedCharsetStr, dataStr; 31 // Copy2: String8 mDataUri -> std::string 32 const bool ret = net::DataURL::Parse( 33 GURL(std::string(mDataUri.string())), 34 &mimeTypeStr, &unusedCharsetStr, &dataStr); 35 // Copy3: std::string dataStr -> AString mData 36 mData.setTo(dataStr.data(), dataStr.length()); 37 mInited = ret ? OK : UNKNOWN_ERROR; 38 39 // The chromium data url implementation defaults to using "text/plain" 40 // if no mime type is specified. We prefer to leave this unspecified 41 // instead, since the mime type is sniffed in most cases. 42 if (mimeTypeStr != "text/plain") { 43 mMimeType = mimeTypeStr.c_str(); 44 } 45 } 46 47 ssize_t DataUriSource::readAt(off64_t offset, void *out, size_t size) { 48 if (mInited != OK) { 49 return mInited; 50 } 51 52 const off64_t length = mData.size(); 53 if (offset >= length) { 54 return UNKNOWN_ERROR; 55 } 56 57 const char *dataBuf = mData.c_str(); 58 const size_t bytesToCopy = 59 offset + size >= length ? (length - offset) : size; 60 61 if (bytesToCopy > 0) { 62 memcpy(out, dataBuf + offset, bytesToCopy); 63 } 64 65 return bytesToCopy; 66 } 67 68 } // namespace android 69
