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Copy pathStringCompression.cs
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126 lines (112 loc) · 5.65 KB
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using System.IO.Compression;
using System.Text;
namespace ptr727.Utilities;
// https://stackoverflow.com/questions/7343465/compression-decompression-string-with-c-sharp
/// <summary>
/// Provides string compression and decompression using Deflate algorithm.
/// </summary>
public static class StringCompression
{
/// <summary>
/// Compresses a string using Deflate compression and returns a Base64-encoded string.
/// </summary>
/// <param name="uncompressedString">The string to compress.</param>
/// <param name="compressionLevel">The compression level to use. Default is <see cref="CompressionLevel.Optimal"/>.</param>
/// <returns>A Base64-encoded compressed string.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="uncompressedString"/> is null.</exception>
public static string Compress(
string uncompressedString,
CompressionLevel compressionLevel = CompressionLevel.Optimal
)
{
ArgumentNullException.ThrowIfNull(uncompressedString);
using MemoryStream uncompressedStream = new(Encoding.UTF8.GetBytes(uncompressedString));
using MemoryStream compressedStream = new();
using (
DeflateStream compressorStream = new(
compressedStream,
compressionLevel,
leaveOpen: true
)
)
{
uncompressedStream.CopyTo(compressorStream);
}
byte[] compressedBytes = compressedStream.ToArray();
return Convert.ToBase64String(compressedBytes);
}
/// <summary>
/// Compresses a string asynchronously using Deflate compression and returns a Base64-encoded string.
/// </summary>
/// <param name="uncompressedString">The string to compress.</param>
/// <param name="compressionLevel">The compression level to use. Default is <see cref="CompressionLevel.Optimal"/>.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>A Base64-encoded compressed string.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="uncompressedString"/> is null.</exception>
public static async Task<string> CompressAsync(
string uncompressedString,
CompressionLevel compressionLevel = CompressionLevel.Optimal,
CancellationToken cancellationToken = default
)
{
ArgumentNullException.ThrowIfNull(uncompressedString);
using MemoryStream uncompressedStream = new(Encoding.UTF8.GetBytes(uncompressedString));
using MemoryStream compressedStream = new();
DeflateStream compressorStream = new(compressedStream, compressionLevel, leaveOpen: true);
await using (compressorStream.ConfigureAwait(false))
{
await uncompressedStream
.CopyToAsync(compressorStream, cancellationToken)
.ConfigureAwait(false);
}
byte[] compressedBytes = compressedStream.ToArray();
return Convert.ToBase64String(compressedBytes);
}
/// <summary>
/// Decompresses a Base64-encoded compressed string.
/// </summary>
/// <param name="compressedString">The Base64-encoded compressed string to decompress.</param>
/// <returns>The decompressed string.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="compressedString"/> is null.</exception>
/// <exception cref="FormatException">Thrown when <paramref name="compressedString"/> is not a valid Base64 string.</exception>
/// <exception cref="InvalidDataException">Thrown when the compressed data is invalid or corrupted.</exception>
public static string Decompress(string compressedString)
{
ArgumentNullException.ThrowIfNull(compressedString);
using MemoryStream compressedStream = new(Convert.FromBase64String(compressedString));
using MemoryStream decompressedStream = new();
using (DeflateStream decompressorStream = new(compressedStream, CompressionMode.Decompress))
{
decompressorStream.CopyTo(decompressedStream);
}
byte[] decompressedBytes = decompressedStream.ToArray();
return Encoding.UTF8.GetString(decompressedBytes);
}
/// <summary>
/// Decompresses a Base64-encoded compressed string asynchronously.
/// </summary>
/// <param name="compressedString">The Base64-encoded compressed string to decompress.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>The decompressed string.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="compressedString"/> is null.</exception>
/// <exception cref="FormatException">Thrown when <paramref name="compressedString"/> is not a valid Base64 string.</exception>
/// <exception cref="InvalidDataException">Thrown when the compressed data is invalid or corrupted.</exception>
public static async Task<string> DecompressAsync(
string compressedString,
CancellationToken cancellationToken = default
)
{
ArgumentNullException.ThrowIfNull(compressedString);
using MemoryStream compressedStream = new(Convert.FromBase64String(compressedString));
using MemoryStream decompressedStream = new();
DeflateStream decompressorStream = new(compressedStream, CompressionMode.Decompress);
await using (decompressorStream.ConfigureAwait(false))
{
await decompressorStream
.CopyToAsync(decompressedStream, cancellationToken)
.ConfigureAwait(false);
}
byte[] decompressedBytes = decompressedStream.ToArray();
return Encoding.UTF8.GetString(decompressedBytes);
}
}