/*
* -----------------
* | 0 | 4 | blockNum
* | 4 | 4 | 0
* ---------------
* | 8 + N*8 + 0 | 4 | uncompressedSize
* | 8 + N*8 + 4 | 4 | compressedSize
* ---------------
* blockData
* ---------------
*/
public static int Encode(int blockSize, byte [] src, int srcOffset, int srcLength, byte [] dest, int destOffset, int destLength)
{
int blockNum = (src.Length + blockSize - 1) / blockSize;
int headerSize = 8 + blockNum * 8;
FastLoaderUtil.GetByteArrayFromInt(blockNum, dest, destOffset + 0);
FastLoaderUtil.GetByteArrayFromInt(0, dest, destOffset + 4);
int sizeSum = headerSize;
int currentDestOffset = destOffset + headerSize;
for (int i = 0; i < blockNum; ++i)
{
// write to data
int originSize = blockSize;
if (blockSize + (i * blockSize) > srcLength)
{
originSize = srcLength - (i * blockSize);
}
int compressedSize = LZ4Codec.Encode(src, srcOffset + (i * blockSize), originSize, dest,
currentDestOffset, destLength - currentDestOffset + destOffset);
// write to header block
FastLoaderUtil.GetByteArrayFromInt(originSize, dest, destOffset + 8 + (i * 8) + 0);
FastLoaderUtil.GetByteArrayFromInt(compressedSize, dest, destOffset + 8 + (i * 8) + 4);
currentDestOffset += compressedSize;
sizeSum += compressedSize;
}
return(sizeSum);
}
private void WriteTextureToStream(Stream stream, Texture2D texture, bool isCompress, int blockSize)
{
byte[] rawData = texture.GetRawTextureData();
byte[] writeData = null;
int writeDataSize = 0;
if (isCompress)
{
writeData = this.lz4Buffer;
writeDataSize = Lz4Util.Encode(blockSize, rawData, 0, rawData.Length, writeData, 0, writeData.Length);
Debug.Log("Write " + rawData.Length + "->" + writeDataSize);
}
else
{
writeData = rawData;
writeDataSize = rawData.Length;
}
byte[] fileData = new byte[writeDataSize + 32];
int flag = TextureLoaderUtil.GetFlagInt(isCompress, (texture.mipmapCount > 1), (texture.filterMode != FilterMode.Point));
// write header
System.Array.Copy(FastLoaderUtil.FastTextureHeader, 0, fileData, 0, FastLoaderUtil.FastTextureHeader.Length);
FastLoaderUtil.GetByteArrayFromInt(texture.width, fileData, 8);
FastLoaderUtil.GetByteArrayFromInt(texture.height, fileData, 12);
FastLoaderUtil.GetByteArrayFromInt((int)texture.format, fileData, 16);
FastLoaderUtil.GetByteArrayFromInt(flag, fileData, 20);
FastLoaderUtil.GetByteArrayFromInt(writeDataSize, fileData, 24);
FastLoaderUtil.GetByteArrayFromInt(rawData.Length, fileData, 28);
System.Array.Copy(writeData, 0, fileData, 32, writeDataSize);
stream.Write(fileData, 0, fileData.Length);
// calc crc32
byte[] crc32 = new byte[4];
FastLoaderUtil.GetByteArrayFromInt(Crc32.GetValue(fileData, 0, fileData.Length), crc32, 0);
stream.Write(crc32, 0, crc32.Length);
Debug.Log("format " + texture.format + "::" + (int)texture.format);
}
