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[wip] can use object of CatchableError for LeopardError with workaround

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Michael Bradley, Jr 2022-03-18 13:10:11 -05:00
parent 26135f37e3
commit 4d8964e554
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1 changed files with 13 additions and 14 deletions
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leopard.nim
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@ -47,20 +47,19 @@ type
LeopardNeedMoreData = wrapper.LeopardNeedMoreData
LeopardSuccess = wrapper.LeopardSuccess
# Regardless of comment above, if LeopardError is `object of CatchableError`
# there seems to be a weird edge case, possibly owing to the LeopardResult
# enum starting with a negative number, whereby there is a compile-time error
# on Linux and Windows (but not macOS) re: stew/results in the context of a
# nimbus-build-system project; that error is not encountered in a
# choosenim/nimble setup using Nim 1.2, 1.4, or 1.6.
LeopardError* = object # of CatchableError
LeopardError* = object of CatchableError
code*: LeopardResult
msg*: string
ParityData* = Data
ReedSolomonCode* = tuple[codeword, data, parity: uint] # symbol counts
# workaround for https://github.com/nim-lang/Nim/issues/19619
# necessary for use of nim-leopard in nimbus-build-system projects because nbs
# ships libbacktrace by default
proc `$`*(err: LeopardError): string {.noSideEffect.} =
$err
# https://github.com/catid/leopard/issues/12
# https://www.cs.cmu.edu/~guyb/realworld/reedsolomon/reed_solomon_codes.html
#
@ -70,12 +69,6 @@ type
# data symbols = 239
# parity symbols = 255 - 239 = 16
func isValid*(code: ReedSolomonCode): bool =
not ((code.codeword - code.data != code.parity) or
(code.parity > code.data) or (code.codeword < MinSymbols + 1) or
(code.data < MinSymbols) or (code.parity < MinSymbols) or
(code.codeword > MaxTotalSymbols))
proc RS*(codeword, data: Positive): ReedSolomonCode =
var
parity = codeword - data
@ -83,6 +76,12 @@ proc RS*(codeword, data: Positive): ReedSolomonCode =
if parity < 0: parity = 0
(codeword: codeword.uint, data: data.uint, parity: parity.uint)
func isValid*(code: ReedSolomonCode): bool =
not ((code.codeword - code.data != code.parity) or
(code.parity > code.data) or (code.codeword < MinSymbols + 1) or
(code.data < MinSymbols) or (code.parity < MinSymbols) or
(code.codeword > MaxTotalSymbols))
when (NimMajor, NimMinor, NimPatch) < (1, 4, 0):
const
header = "<stdlib.h>"