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allow 10-byte length prefixes #34

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Merged
tersec merged 1 commit into from
Feb 24, 2025
Merged

allow 10-byte length prefixes #34

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10 changes: 5 additions & 5 deletions snappy/codec.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -126,16 +126,16 @@ func maxCompressedLen*(inputLen: int): Opt[uint64] =
static: doAssert uint32.high.uint64 <= maxUncompressedLen.uint64
ok(maxCompressedLen(inputLen.uint32))

func uncompressedLen*(input: openArray[byte]): Opt[uint32] =
## Read the uncompressed length from a stream - at least the first 5
func uncompressedLen*(input: openArray[byte]): Opt[uint64] =
## Read the uncompressed length from a stream - at least the first 10
## bytes of the compressed input must be given
## `uint32` is used because the length may not fit in an `int`
## `uint64` is used because the length may not fit in an `int`
## on 32-bit machines.
let (lenU32, bytesRead) = fromBytes(uint32, input, Leb128)
let (lenU64, bytesRead) = fromBytes(uint64, input, Leb128)
if bytesRead <= 0:
err()
else:
ok(lenU32)
ok(lenU64)

func maxCompressedLenFramed*(inputLen: int64): uint64 =
## The maximum number of bytes a compressed framed snappy stream will occupy,
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