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Add tests for BigInt unmarshalling

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Checks little & big endian w.r.t. padding.
This commit is contained in:
Mark Spanbroek 2023-10-30 13:06:44 +01:00
parent 5f7ba18f2e
commit cd93aebbff
1 changed files with 34 additions and 0 deletions
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34
tests/math_bigints/t_io_bigints.nim
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@ -120,4 +120,38 @@ proc main() =
let hex = y.toHex()
check: pHex == hex
suite "IO Marshalling - BigInt" & " [" & $WordBitWidth & "-bit words]":
test "unmarshalling byte array":
block: # Big-Endian with byte padding
let bytes = [0x12'u8, 0x34'u8, 0x56'u8]
let x = BigInt[256].unmarshal(bytes, bigEndian)
check x.toHex() == "0x0000000000000000000000000000000000000000000000000000000000123456"
block: # Big-Endian with bit padding
let bytes = [0x12'u8, 0x34'u8, 0x56'u8]
let x = BigInt[254].unmarshal(bytes, bigEndian)
check x.toHex() == "0x0000000000000000000000000000000000000000000000000000000000123456"
block: # Big-Endian without padding
var bytes: array[32, byte]
bytes[^3..^1] = [0x12'u8, 0x34'u8, 0x56'u8]
let x = BigInt[256].unmarshal(bytes, bigEndian)
check x.toHex() == "0x0000000000000000000000000000000000000000000000000000000000123456"
block: # Little-Endian with byte padding
let bytes = [0x12'u8, 0x34'u8, 0x56'u8]
let x = BigInt[256].unmarshal(bytes, littleEndian)
check x.toHex() == "0x0000000000000000000000000000000000000000000000000000000000563412"
block: # Little-Endian with bit padding
let bytes = [0x12'u8, 0x34'u8, 0x56'u8]
let x = BigInt[254].unmarshal(bytes, littleEndian)
check x.toHex() == "0x0000000000000000000000000000000000000000000000000000000000563412"
block: # Little-Endian without padding
var bytes: array[32, byte]
bytes[^3..^1] = [0x12'u8, 0x34'u8, 0x56'u8]
let x = BigInt[256].unmarshal(bytes, littleEndian)
check x.toHex() == "0x5634120000000000000000000000000000000000000000000000000000000000"
main()