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fight the code bloat in base64.nim

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Araq
2020-03-20 10:46:58 +01:00
parent 12ab5059a0
commit dae9865b14
1 changed files with 16 additions and 7 deletions
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23
lib/pure/base64.nim
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@@ -61,12 +61,21 @@
## * `md5 module<md5.html>`_ implements the MD5 checksum algorithm
## * `sha1 module<sha1.html>`_ implements a sha1 encoder and decoder
template cbBase(a, b): untyped = [
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', a, b]
let
cb64 = cbBase('+', '/')
cb64safe = cbBase('-', '_')
const
cb64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
cb64safe = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
invalidChar = 255
template encodeInternal(s: typed, alphabet: string): untyped =
template encodeInternal(s: typed, alphabet: ptr array[64, char]): untyped =
## encodes `s` into base64 representation.
proc encodeSize(size: int): int =
return (size * 4 div 3) + 6
@@ -139,8 +148,8 @@ proc encode*[T: SomeInteger|char](s: openArray[T], safe = false): string =
assert encode(['n', 'i', 'm']) == "bmlt"
assert encode(@['n', 'i', 'm']) == "bmlt"
assert encode([1, 2, 3, 4, 5]) == "AQIDBAU="
if safe: encodeInternal(s, cb64safe)
else: encodeInternal(s, cb64)
let lookupTable = if safe: unsafeAddr(cb64safe) else: unsafeAddr(cb64)
encodeInternal(s, lookupTable)
proc encode*(s: string, safe = false): string =
## Encodes ``s`` into base64 representation.
@@ -158,8 +167,8 @@ proc encode*(s: string, safe = false): string =
## * `decode proc<#decode,string>`_ for decoding a string
runnableExamples:
assert encode("Hello World") == "SGVsbG8gV29ybGQ="
if safe: encodeInternal(s, cb64safe)
else: encodeInternal(s, cb64)
let lookupTable = if safe: unsafeAddr(cb64safe) else: unsafeAddr(cb64)
encodeInternal(s, lookupTable)
proc encodeMIME*(s: string, lineLen = 75, newLine = "\r\n"): string =
## Encodes ``s`` into base64 representation as lines.