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/*
* Copyright 2019 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 "aassetstreamadaptor.h"
#include <log/log.h>
AAssetStreamAdaptor::AAssetStreamAdaptor(AAsset* asset)
: mAAsset(asset)
{
}
bool AAssetStreamAdaptor::rewind() {
off64_t pos = AAsset_seek64(mAAsset, 0, SEEK_SET);
if (pos == (off64_t)-1) {
ALOGE("rewind failed!");
return false;
}
return true;
}
size_t AAssetStreamAdaptor::getLength() const {
return AAsset_getLength64(mAAsset);
}
bool AAssetStreamAdaptor::isAtEnd() const {
return AAsset_getRemainingLength64(mAAsset) == 0;
}
SkStreamRewindable* AAssetStreamAdaptor::onDuplicate() const {
// Cannot sensibly create a duplicate, since each AAssetStreamAdaptor
// would be modifying the same AAsset.
//return new AAssetStreamAdaptor(mAAsset);
return nullptr;
}
bool AAssetStreamAdaptor::hasPosition() const {
return AAsset_seek64(mAAsset, 0, SEEK_CUR) != -1;
}
size_t AAssetStreamAdaptor::getPosition() const {
const off64_t offset = AAsset_seek64(mAAsset, 0, SEEK_CUR);
if (offset == -1) {
ALOGE("getPosition failed!");
return 0;
}
return offset;
}
bool AAssetStreamAdaptor::seek(size_t position) {
if (AAsset_seek64(mAAsset, position, SEEK_SET) == -1) {
ALOGE("seek failed!");
return false;
}
return true;
}
bool AAssetStreamAdaptor::move(long offset) {
if (AAsset_seek64(mAAsset, offset, SEEK_CUR) == -1) {
ALOGE("move failed!");
return false;
}
return true;
}
size_t AAssetStreamAdaptor::read(void* buffer, size_t size) {
ssize_t amount;
if (!buffer) {
if (!size) {
return 0;
}
// asset->seek returns new total offset
// we want to return amount that was skipped
const off64_t oldOffset = AAsset_seek64(mAAsset, 0, SEEK_CUR);
if (oldOffset == -1) {
ALOGE("seek(oldOffset) failed!");
return 0;
}
const off64_t newOffset = AAsset_seek64(mAAsset, size, SEEK_CUR);
if (-1 == newOffset) {
ALOGE("seek(%zu) failed!", size);
return 0;
}
amount = newOffset - oldOffset;
} else {
amount = AAsset_read(mAAsset, buffer, size);
}
if (amount < 0) {
amount = 0;
}
return amount;
}
const void* AAssetStreamAdaptor::getMemoryBase() {
return AAsset_getBuffer(mAAsset);
}
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