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[LZ4] Fix incorrect block checksums in case of incompressible blocks

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This commit is contained in:
Timofey Solomko
2021-10-16 16:25:15 +03:00
parent 254fe0c848
commit be899bc355
1 changed files with 12 additions and 5 deletions
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Sources/LZ4/LZ4+Compress.swift
+12 -5
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@@ -86,6 +86,13 @@ extension LZ4: CompressionAlgorithm {
out.append(UInt8(truncatingIfNeeded: (blockSize & (0xFF << (i * 8))) >> (i * 8)))
}
out.append(contentsOf: blockData)
if blockChecksums {
let blockChecksum = XxHash32.hash(data: blockData)
for i: UInt32 in 0..<4 {
out.append(UInt8(truncatingIfNeeded: (blockChecksum & (0xFF << (i * 8))) >> (i * 8)))
}
}
} else {
if compressedBlock.count > 0x7FFFFFFF {
// TODO: In this case we cannot properly store uncompressed block, since either the highest bit of
@@ -97,12 +104,12 @@ extension LZ4: CompressionAlgorithm {
out.append(UInt8(truncatingIfNeeded: (blockSize & (0xFF << (i * 8))) >> (i * 8)))
}
out.append(contentsOf: compressedBlock)
}
if blockChecksums {
let blockChecksum = XxHash32.hash(data: Data(compressedBlock))
for i: UInt32 in 0..<4 {
out.append(UInt8(truncatingIfNeeded: (blockChecksum & (0xFF << (i * 8))) >> (i * 8)))
if blockChecksums {
let blockChecksum = XxHash32.hash(data: Data(compressedBlock))
for i: UInt32 in 0..<4 {
out.append(UInt8(truncatingIfNeeded: (blockChecksum & (0xFF << (i * 8))) >> (i * 8)))
}
}
}
}