74 lines
2.5 KiB
C++
Vendored
74 lines
2.5 KiB
C++
Vendored
/*
|
|
* Copyright (C) 2017 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 <stdint.h>
|
|
#include <memory.h>
|
|
|
|
#include "oboe_common_FixedBlockAdapter_android.h"
|
|
|
|
#include "oboe_common_FixedBlockReader_android.h"
|
|
|
|
|
|
FixedBlockReader::FixedBlockReader(FixedBlockProcessor &fixedBlockProcessor)
|
|
: FixedBlockAdapter(fixedBlockProcessor) {
|
|
mPosition = mSize;
|
|
}
|
|
|
|
int32_t FixedBlockReader::open(int32_t bytesPerFixedBlock) {
|
|
int32_t result = FixedBlockAdapter::open(bytesPerFixedBlock);
|
|
mPosition = 0;
|
|
mValid = 0;
|
|
return result;
|
|
}
|
|
|
|
int32_t FixedBlockReader::readFromStorage(uint8_t *buffer, int32_t numBytes) {
|
|
int32_t bytesToRead = numBytes;
|
|
int32_t dataAvailable = mValid - mPosition;
|
|
if (bytesToRead > dataAvailable) {
|
|
bytesToRead = dataAvailable;
|
|
}
|
|
memcpy(buffer, mStorage.get() + mPosition, bytesToRead);
|
|
mPosition += bytesToRead;
|
|
return bytesToRead;
|
|
}
|
|
|
|
int32_t FixedBlockReader::read(uint8_t *buffer, int32_t numBytes) {
|
|
int32_t bytesRead;
|
|
int32_t bytesLeft = numBytes;
|
|
while(bytesLeft > 0) {
|
|
if (mPosition < mValid) {
|
|
// Use up bytes currently in storage.
|
|
bytesRead = readFromStorage(buffer, bytesLeft);
|
|
buffer += bytesRead;
|
|
bytesLeft -= bytesRead;
|
|
} else if (bytesLeft >= mSize) {
|
|
// Nothing in storage. Read through if enough for a complete block.
|
|
bytesRead = mFixedBlockProcessor.onProcessFixedBlock(buffer, mSize);
|
|
if (bytesRead < 0) return bytesRead;
|
|
buffer += bytesRead;
|
|
bytesLeft -= bytesRead;
|
|
} else {
|
|
// Just need a partial block so we have to reload storage.
|
|
bytesRead = mFixedBlockProcessor.onProcessFixedBlock(mStorage.get(), mSize);
|
|
if (bytesRead < 0) return bytesRead;
|
|
mPosition = 0;
|
|
mValid = bytesRead;
|
|
if (bytesRead == 0) break;
|
|
}
|
|
}
|
|
return numBytes - bytesLeft;
|
|
}
|