/// <summary>
/// Decompresses the specified bytes using LZMA and the
/// <see cref="CompressionSettings"/> that have been used to originally compress the bytes.
/// </summary>
/// <param name="compressedBytes">The compressed <c>byte[]</c> array that you want to decompress.</param>
/// <param name="compressionSettings">The <see cref="CompressionSettings"/> that have been used to compress the bytes.</param>
/// <returns>The decompressed <c>bytes[]</c>.</returns>
public byte[] Decompress(byte[] compressedBytes, CompressionSettings compressionSettings)
{
if (ReferenceEquals(compressedBytes, null))
{
return(null);
}
if (compressedBytes.Length == 0)
{
return(Array.Empty <byte>());
}
byte[] decompressedBytes;
var decoder = new Decoder();
MemoryStream input = new MemoryStream(compressedBytes);
MemoryStream output = new MemoryStream(compressedBytes.Length / 2 * 3);
try
{
input.Seek(0, 0);
byte[] props = new byte[5];
if (input.Read(props, 0, 5) != 5)
{
throw new InvalidDataException($"{nameof(LzmaUtility)}: input LZMA data is too short. Returning null...");
}
long outSize = 0;
for (int i = 0; i < 8; i++)
{
int v = input.ReadByte();
if (v < 0)
{
throw new InvalidDataException($"{nameof(LzmaUtility)}: Can't read byte at {nameof(input)} position \"{input.Position}\"...");
}
outSize |= ((long)(byte)v) << (8 * i);
}
decoder.SetDecoderProperties(props);
long compressedSize = input.Length - input.Position;
decoder.Code(input, output, compressedSize, outSize, null);
decompressedBytes = output.ToArray();
}
catch (Exception e)
{
string msg = $"{nameof(LzmaUtility)}: Decompression failed; thrown exception: {e.ToString()}";
throw new InvalidDataException(msg);
}
finally
{
input.Dispose();
output.Dispose();
}
return(decompressedBytes);
}
/// <summary>
/// Compresses the specified bytes using LZMA.
/// </summary>
/// <returns>The compressed <c>byte[]</c> array.</returns>
/// <param name="bytes">The <c>byte[]</c> array to compress.</param>
/// <param name="compressionSettings">The desired <see cref="CompressionSettings"/>.</param>
public byte[] Compress(byte[] bytes, CompressionSettings compressionSettings)
{
if (ReferenceEquals(bytes, null))
{
return(null);
}
if (bytes.Length == 0)
{
return(Array.Empty <byte>());
}
byte[] compressedBytes;
var encoder = new Encoder();
encoder.SetCoderProperties(propIDs, compressionSettings.compressionLevel == CompressionLevel.Optimal ? propertiesOptimal : propertiesNormal);
MemoryStream input = new MemoryStream(bytes);
MemoryStream output = new MemoryStream(bytes.Length / 4 * 3);
try
{
encoder.WriteCoderProperties(output);
long size = input.Length;
for (int i = 0; i < 8; i++)
{
output.WriteByte((byte)(size >> (8 * i)));
}
encoder.Code(input, output, -1, -1, null);
compressedBytes = output.ToArray();
}
catch
{
compressedBytes = null;
}
finally
{
input.Dispose();
output.Dispose();
}
return(compressedBytes);
}
/// <summary>
/// Decompresses the specified bytes using <see cref="GZipStream"/> and the
/// <see cref="CompressionSettings"/> that have been used to originally compress the bytes.
/// </summary>
/// <param name="gzippedBytes">The gzipped <c>byte[]</c> array that you want to decompress.</param>
/// <param name="compressionSettings">The <see cref="CompressionSettings"/> that have been used to compress the bytes.</param>
/// <returns>The decompressed <c>bytes[]</c>.</returns>
public byte[] Decompress(byte[] gzippedBytes, CompressionSettings compressionSettings)
{
if (ReferenceEquals(gzippedBytes, null))
{
return(null);
}
if (gzippedBytes.Length == 0)
{
return(Array.Empty <byte>());
}
using MemoryStream input = new MemoryStream(gzippedBytes);
using MemoryStream output = new MemoryStream(gzippedBytes.Length / 2 * 3);
using GZipStream decompressionStream = new GZipStream(input, CompressionMode.Decompress);
decompressionStream.CopyTo(output, Math.Max(4096, compressionSettings.bufferSize));
decompressionStream.Flush();
return(output.ToArray());
}
/// <summary>
/// Compresses the specified bytes using <see cref="GZipStream"/> and the provided <see cref="CompressionSettings"/>.
/// </summary>
/// <returns>The gzipped <c>byte[]</c> array.</returns>
/// <param name="bytes">The <c>byte[]</c> array to compress.</param>
/// <param name="compressionSettings">The desired <see cref="CompressionSettings"/>.</param>
public byte[] Compress(byte[] bytes, CompressionSettings compressionSettings)
{
if (ReferenceEquals(bytes, null))
{
return(null);
}
if (bytes.Length == 0)
{
return(Array.Empty <byte>());
}
using MemoryStream input = new MemoryStream(bytes);
using MemoryStream output = new MemoryStream(bytes.Length / 4 * 3);
using GZipStream compressionStream = new GZipStream(output, compressionSettings.compressionLevel);
input.CopyTo(compressionStream, Math.Max(4096, compressionSettings.bufferSize));
compressionStream.Flush();
return(output.ToArray());
}
/// <summary>
/// Decompresses the specified bytes using <see cref="GZipStream"/> and the
/// <see cref="CompressionSettings"/> that have been used to originally compress the bytes.
/// </summary>
/// <param name="gzippedBytes">The gzipped <c>byte[]</c> array that you want to decompress.</param>
/// <param name="compressionSettings">The <see cref="CompressionSettings"/> that have been used to compress the bytes.</param>
/// <returns>The decompressed <c>bytes[]</c>.</returns>
public async Task <byte[]> Decompress(byte[] gzippedBytes, CompressionSettings compressionSettings)
{
if (ReferenceEquals(gzippedBytes, null))
{
return(null);
}
if (gzippedBytes.Length == 0)
{
return(Array.Empty <byte>());
}
await using MemoryStream input = new MemoryStream(gzippedBytes);
await using MemoryStream output = new MemoryStream(gzippedBytes.Length / 2 * 3);
await using GZipStream decompressionStream = new GZipStream(input, CompressionMode.Decompress);
await decompressionStream.CopyToAsync(output, Math.Max(4096, compressionSettings.bufferSize)).ConfigureAwait(false);
await decompressionStream.FlushAsync().ConfigureAwait(false);
return(output.ToArray());
}
/// <summary>
/// Compresses the specified bytes using <see cref="GZipStream"/> and the provided <see cref="CompressionSettings"/>.
/// </summary>
/// <returns>The gzipped <c>byte[]</c> array.</returns>
/// <param name="bytes">The <c>byte[]</c> array to compress.</param>
/// <param name="compressionSettings">The desired <see cref="CompressionSettings"/>.</param>
public async Task <byte[]> Compress(byte[] bytes, CompressionSettings compressionSettings)
{
if (ReferenceEquals(bytes, null))
{
return(null);
}
if (bytes.Length == 0)
{
return(Array.Empty <byte>());
}
await using MemoryStream input = new MemoryStream(bytes);
await using MemoryStream output = new MemoryStream(bytes.Length / 4 * 3);
await using GZipStream compressionStream = new GZipStream(output, compressionSettings.compressionLevel);
await input.CopyToAsync(compressionStream, Math.Max(4096, compressionSettings.bufferSize)).ConfigureAwait(false);
await compressionStream.FlushAsync().ConfigureAwait(false);
return(output.ToArray());
}
/// <summary>
/// Decompresses the specified bytes using LZMA and the
/// <see cref="CompressionSettings"/> that have been used to originally compress the bytes.
/// </summary>
/// <param name="compressedBytes">The compressed <c>byte[]</c> array that you want to decompress.</param>
/// <param name="compressionSettings">The <see cref="CompressionSettings"/> that have been used to compress the bytes.</param>
/// <returns>The decompressed <c>bytes[]</c>.</returns>
public Task <byte[]> Decompress(byte[] compressedBytes, CompressionSettings compressionSettings)
{
return(Task.Run(() => lzma.Decompress(compressedBytes, compressionSettings)));
}
/// <summary>
/// Compresses the specified bytes using LZMA.
/// </summary>
/// <returns>The compressed <c>byte[]</c> array.</returns>
/// <param name="bytes">The <c>byte[]</c> array to compress.</param>
/// <param name="compressionSettings">The desired <see cref="CompressionSettings"/>.</param>
public Task <byte[]> Compress(byte[] bytes, CompressionSettings compressionSettings)
{
return(Task.Run(() => lzma.Compress(bytes, compressionSettings)));
}
