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Address review comments; Add documentation; Shared buffering mechanism for input and output streams

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This commit is contained in:
Zahary Karadjov 2020-04-29 21:19:18 +03:00
commit b24300bd3f
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GPG key ID: C8936F8A3073D609
24 changed files with 2396 additions and 1060 deletions
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16
tests/base64.nim
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@ -13,8 +13,6 @@ const
invalidChar = 255
paddingByte = byte('=')
template encodeSize(size: int): int = (size * 4 div 3) + 6
proc base64encode*(i: InputStream, o: OutputStream) =
var
n: uint32
@ -25,7 +23,7 @@ proc base64encode*(i: InputStream, o: OutputStream) =
n = exp
template outputChar(x: typed) =
o.append cb64[x and 63]
o.write cb64[x and 63]
while i.readable(3):
inputByte(b shl 16)
@ -43,12 +41,12 @@ proc base64encode*(i: InputStream, o: OutputStream) =
outputChar(n shr 18)
outputChar(n shr 12)
outputChar(n shr 6)
o.append paddingByte
o.write paddingByte
else:
outputChar(n shr 18)
outputChar(n shr 12)
o.append paddingByte
o.append paddingByte
o.write paddingByte
o.write paddingByte
proc initDecodeTable*(): array[256, char] =
# computes a decode table at compile time
@ -80,11 +78,11 @@ proc base64decode*(i: InputStream, o: OutputStream) =
raiseInvalidChar(c, i.pos - 1)
template outputChar(x: untyped) =
o.append char(x and 255)
o.write char(x and 255)
let inputLen = i.len
if inputLen != lengthUnknown:
o.prepareRunway decodeSize(inputLen)
if inputLen.isSome:
o.ensureRunway decodeSize(inputLen.get)
# hot loop: read 4 characters at at time
while i.readable(8):