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