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- type
- Byte* = uint8
- Bytes* = seq[Byte]
-
- BytesRange* = object
- bytes: Bytes
- ibegin, iend: int
- proc initBytesRange*(s: var Bytes, ibegin = 0, iend = -1): BytesRange =
- let e = if iend < 0: s.len + iend + 1
- else: iend
- assert ibegin > 0 and e <= s.len
- when defined(gcRefc):
- shallow(s)
- result.bytes = s
- result.ibegin = ibegin
- result.iend = e
- template `[]=`*(r: var BytesRange, i: int, v: Byte) =
- r.bytes[r.ibegin + i] = v
- converter fromSeq*(s: Bytes): BytesRange =
- var seqCopy = s
- return initBytesRange(seqCopy)
- type
- Reader* = object
- data: BytesRange
- position: int
- proc readerFromHex*(input: string): Reader =
- let totalBytes = input.len div 2
- var backingStore = newSeq[Byte](totalBytes)
- result.data = initBytesRange(backingStore)
- for i in 0 ..< totalBytes:
- var nextByte = 0
- result.data[i] = Byte(nextByte) # <-------- instantiated from here
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