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base64: decoding works

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Araq 2010-10-23 17:35:26 +02:00
commit 56e963b465
1 changed files with 6 additions and 20 deletions
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26
lib/pure/base64.nim
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@ -90,18 +90,11 @@ proc decode*(s: string): string =
inc(r, 3) inc(r, 3)
inc(i, 4) inc(i, 4)
else: break else: break
if i < s.len-2 and s[i+2] == '=': assert i == s.len
var a = s[i].decodeByte # adjust the length:
var b = s[i+1].decodeByte if i > 0 and s[i-1] == '=':
result[r] = chr(a shl 2 or ((b shr 4) and 3)) dec(r)
inc(r) if i > 1 and s[i-2] == '=': dec(r)
elif i < s.len-3 and s[i+3] == '=':
var a = s[i].decodeByte
var b = s[i+1].decodeByte
var c = s[i+2].decodeByte
result[r] = chr((a shl 2) or ((b shr 4) and 3))
result[r+1] = chr((b shl 4) or ((c shr 2) and 0xF))
inc(r, 2)
setLen(result, r) setLen(result, r)
when isMainModule: when isMainModule:
@ -118,12 +111,5 @@ when isMainModule:
const tests = ["", "abc", "xyz", "man", "leasure.", "sure.", "easure.", const tests = ["", "abc", "xyz", "man", "leasure.", "sure.", "easure.",
"asure.", longText] "asure.", longText]
for t in items(tests): for t in items(tests):
if decode(encode(t)) != t: assert decode(encode(t)) == t
echo "##", t, "##"
echo encode("Man is distinguished, not only by his reason, but by this" &
" singular passion from other animals, which is a lust of the mind, " &
"that by a perseverance of delight in the continued and indefatigable" &
" generation of knowledge, exceeds the short vehemence of any carnal" &
" pleasure.")