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/*
* Copyright (C) 2010 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 "Utils.h"
#include "SkUtils.h"
using namespace android;
bool AssetStreamAdaptor::rewind() {
off64_t pos = fAsset->seek(0, SEEK_SET);
if (pos == (off64_t)-1) {
SkDebugf("----- fAsset->seek(rewind) failed\n");
return false;
}
return true;
}
size_t AssetStreamAdaptor::getLength() const {
return fAsset->getLength();
}
bool AssetStreamAdaptor::isAtEnd() const {
return fAsset->getRemainingLength() == 0;
}
SkStreamRewindable* AssetStreamAdaptor::duplicate() const {
SkASSERT(false);
// Cannot create a duplicate, since each AssetStreamAdaptor
// would be modifying the Asset.
//return new AssetStreamAdaptor(fAsset);
return NULL;
}
size_t AssetStreamAdaptor::read(void* buffer, size_t size) {
ssize_t amount;
if (NULL == buffer) {
if (0 == size) {
return 0;
}
// asset->seek returns new total offset
// we want to return amount that was skipped
off64_t oldOffset = fAsset->seek(0, SEEK_CUR);
if (-1 == oldOffset) {
SkDebugf("---- fAsset->seek(oldOffset) failed\n");
return 0;
}
off64_t newOffset = fAsset->seek(size, SEEK_CUR);
if (-1 == newOffset) {
SkDebugf("---- fAsset->seek(%d) failed\n", size);
return 0;
}
amount = newOffset - oldOffset;
} else {
amount = fAsset->read(buffer, size);
if (amount <= 0) {
SkDebugf("---- fAsset->read(%d) returned %d\n", size, amount);
}
}
if (amount < 0) {
amount = 0;
}
return amount;
}
SkMemoryStream* android::CopyAssetToStream(Asset* asset) {
if (NULL == asset) {
return NULL;
}
off64_t size = asset->seek(0, SEEK_SET);
if ((off64_t)-1 == size) {
SkDebugf("---- copyAsset: asset rewind failed\n");
return NULL;
}
size = asset->getLength();
if (size <= 0) {
SkDebugf("---- copyAsset: asset->getLength() returned %d\n", size);
return NULL;
}
SkMemoryStream* stream = new SkMemoryStream(size);
void* data = const_cast<void*>(stream->getMemoryBase());
off64_t len = asset->read(data, size);
if (len != size) {
SkDebugf("---- copyAsset: asset->read(%d) returned %d\n", size, len);
delete stream;
stream = NULL;
}
return stream;
}
jobject android::nullObjectReturn(const char msg[]) {
if (msg) {
SkDebugf("--- %s\n", msg);
}
return NULL;
}
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