/// <summary>
/// Internal convert method to convert byte array to compressed byte array
/// </summary>
/// <param name="data_in">Uncompressed data array</param>
/// <param name="type">Format type, DEFLATE, GZIP, ZLIB</param>
/// <param name="options">Compression options</param>
/// <returns>Compressed data array</returns>
public static byte[] compress(byte[] data_in, ZopfliFormat type, ZopfliOptions options)
{
IntPtr result = IntPtr.Zero;
UIntPtr result_size = UIntPtr.Zero;
try
{
// Get image data length
UIntPtr data_size = (UIntPtr)data_in.Length;
// Compress the data via native methods
if (Environment.Is64BitProcess)
{
ZopfliCompressor64.ZopfliCompress(ref options, type, data_in, data_in.Length, ref result, ref result_size);
}
else
{
ZopfliCompressor32.ZopfliCompress(ref options, type, data_in, data_in.Length, ref result, ref result_size);
}
// Copy data back to managed memory and return
return(NativeUtilities.GetDataFromUnmanagedMemory(result, (int)result_size));
}
catch
{
throw;
}
finally
{
// Free unmanaged memory
Marshal.FreeHGlobal(result);
}
}
/// <summary>
/// Internal convert method to convert byte array to compressed byte array
/// </summary>
/// <param name="data_in">Uncompressed data array</param>
/// <param name="options">Zopfli PNG compression options</param>
/// <returns></returns>
public static byte[] compress(byte[] data_in, ZopfliPNGOptions options)
{
IntPtr result = IntPtr.Zero;
int error = 0;
try
{
// Get image data length
UIntPtr data_size = (UIntPtr)data_in.Length;
// Compress the data via native methods
if (Environment.Is64BitProcess)
{
error = ZopfliPNGCompressor64.ZopfliPNGExternalOptimize(data_in, data_in.Length, ref result);
}
else
{
error = ZopfliPNGCompressor32.ZopfliPNGExternalOptimize(data_in, data_in.Length, ref result);
}
// Copy data back to managed memory and return
return(NativeUtilities.GetDataFromUnmanagedMemory(result, error));
}
catch
{
if (result == IntPtr.Zero && error > 0)
{
throw new ZopfliPNGException(error);
}
throw;
}
finally
{
// Free unmanaged memory
Marshal.FreeHGlobal(result);
}
}