mirror of
https://github.com/playmusicexporter/playmusicexporter
synced 2024-05-17 07:16:42 +00:00
130 lines
3.7 KiB
Java
130 lines
3.7 KiB
Java
/*
|
|
* Copyright (c) 2015 David Schulte
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
package rc.jcg.superuser;
|
|
|
|
import java.util.ArrayList;
|
|
import java.util.List;
|
|
|
|
/**
|
|
* A dynamic growing byte buffer
|
|
*/
|
|
public class ByteBuffer {
|
|
private int mChunkSize = 4096;
|
|
private int mSize = 0;
|
|
private List<byte[]> mChunks = new ArrayList<>();
|
|
|
|
/**
|
|
* Creates a byte buffer
|
|
*/
|
|
public ByteBuffer() {
|
|
}
|
|
|
|
/**
|
|
* Creates a byte buffer
|
|
* @param chunkSize Sets the chunks size
|
|
*/
|
|
public ByteBuffer(int chunkSize) {
|
|
mChunkSize = chunkSize;
|
|
}
|
|
/**
|
|
* @return Returns the size of the buffer
|
|
*/
|
|
public long size() {
|
|
return mSize;
|
|
}
|
|
|
|
/**
|
|
* Clears the buffer
|
|
*/
|
|
public void clear() {
|
|
mSize = 0;
|
|
mChunks.clear();
|
|
}
|
|
|
|
/**
|
|
* Adds bytes to the buffer
|
|
* @param bytes The bytes to add
|
|
*/
|
|
public void append(byte[] bytes, int offset, int length) {
|
|
|
|
|
|
while(length > 0) {
|
|
int freeSpaceInEndChunk = mChunks.size() * mChunkSize - mSize;
|
|
int positionInEndChunk = mChunkSize - freeSpaceInEndChunk;
|
|
|
|
// Adds a new chunk
|
|
if (freeSpaceInEndChunk == 0) {
|
|
mChunks.add(new byte[mChunkSize]);
|
|
freeSpaceInEndChunk = mChunkSize;
|
|
positionInEndChunk = 0;
|
|
}
|
|
byte[] endChunk = mChunks.get(mChunks.size() - 1);
|
|
|
|
// We want to add more bytes the chunk can contain
|
|
if (length > freeSpaceInEndChunk) {
|
|
|
|
// Copies to end of chunk
|
|
System.arraycopy(bytes, offset, endChunk, positionInEndChunk, freeSpaceInEndChunk);
|
|
|
|
// Adds the size
|
|
mSize += freeSpaceInEndChunk;
|
|
offset += freeSpaceInEndChunk;
|
|
length -= freeSpaceInEndChunk;
|
|
} else {
|
|
// Copies the rest of the data
|
|
System.arraycopy(bytes, offset, endChunk, positionInEndChunk, length);
|
|
|
|
// Adds the size
|
|
mSize += length;
|
|
|
|
offset += length;
|
|
length = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return Returns the bytes as array
|
|
*/
|
|
public byte[] toByteArray() {
|
|
byte[] bytes = new byte[mSize];
|
|
|
|
int pos = 0;
|
|
|
|
// Copies all chunks
|
|
for(byte[] subBytes : mChunks) {
|
|
int chunkSize = mChunkSize;
|
|
// Last segment
|
|
if (pos + chunkSize > mSize)
|
|
chunkSize = mSize - pos;
|
|
|
|
// Copies the bytes
|
|
System.arraycopy(subBytes, 0, bytes, pos, chunkSize);
|
|
|
|
pos += chunkSize;
|
|
}
|
|
|
|
return bytes;
|
|
}
|
|
}
|