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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
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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