public async Task CompressedAppendToNonEmptyStreamAndDecompress()
{
var sourceStr1 = "TEST this is TEST";
var sourceStr2 = "THIS IS another TEST";
var utils = new CompressionUtils();
using (var source1 = GetStreamWithContents(sourceStr1))
using (var source2 = GetStreamWithContents(sourceStr2))
using (var target = new MemoryStream())
{
var chunk1Position = 0;
await utils.CopyWithCompression(source1, target);
var chunk2Position = target.Position;
await utils.CopyWithCompression(source2, target);
var decompressedBytes1 = (await utils.ReadWithDecompression(target, chunk1Position)).ToArray();
var decompressedStr1 = Encoding.GetString(decompressedBytes1);
var decompressedBytes2 = (await utils.ReadWithDecompression(target, chunk2Position)).ToArray();
var decompressedStr2 = Encoding.GetString(decompressedBytes2);
sourceStr1.Should().Be(decompressedStr1);
sourceStr2.Should().Be(decompressedStr2);
}
}
public async Task CompressedAppendToEmptyStreamAndDecompress()
{
var sourceStr = "TEST this is TEST";
var utils = new CompressionUtils();
using (var source = GetStreamWithContents(sourceStr))
using (var target = new MemoryStream())
{
await utils.CopyWithCompression(source, target);
var bytes = (await utils.ReadWithDecompression(target, 0)).ToArray();
var decompressedStr = Encoding.GetString(bytes);
sourceStr.Should().BeEquivalentTo(decompressedStr);
}
}
public async Task <List <Document> > GetChunk(long offset)
{
var compression = new CompressionUtils();
if (offset >= _file.Length)
{
// should NEVER happen
throw new InvalidOperationException("Specified position doesn't exist in data file");
}
using (var file = new FileStream(_filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
var segment = await compression.ReadWithDecompression(file, offset);
using (var ms = new MemoryStream(segment.Array, segment.Offset, segment.Count))
{
var batch = await DocumentSerializer.DeserializeBatch(ms).ConfigureAwait(false);
return(batch);
}
}
}
