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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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 <include/DataUriSource.h>
#include <net/base/data_url.h>
#include <googleurl/src/gurl.h>
namespace android {
DataUriSource::DataUriSource(const char *uri) :
mDataUri(uri),
mInited(NO_INIT) {
// Copy1: const char *uri -> String8 mDataUri.
std::string mimeTypeStr, unusedCharsetStr, dataStr;
// Copy2: String8 mDataUri -> std::string
const bool ret = net::DataURL::Parse(
GURL(std::string(mDataUri.string())),
&mimeTypeStr, &unusedCharsetStr, &dataStr);
// Copy3: std::string dataStr -> AString mData
mData.setTo(dataStr.data(), dataStr.length());
mInited = ret ? OK : UNKNOWN_ERROR;
// The chromium data url implementation defaults to using "text/plain"
// if no mime type is specified. We prefer to leave this unspecified
// instead, since the mime type is sniffed in most cases.
if (mimeTypeStr != "text/plain") {
mMimeType = mimeTypeStr.c_str();
}
}
ssize_t DataUriSource::readAt(off64_t offset, void *out, size_t size) {
if (mInited != OK) {
return mInited;
}
const off64_t length = mData.size();
if (offset >= length) {
return UNKNOWN_ERROR;
}
const char *dataBuf = mData.c_str();
const size_t bytesToCopy =
offset + size >= length ? (length - offset) : size;
if (bytesToCopy > 0) {
memcpy(out, dataBuf + offset, bytesToCopy);
}
return bytesToCopy;
}
} // namespace android
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