{{
** Base64 decoding/encoding functions v0.1
** by Robert Quattlebaum <darco@deepdarc.com>
** PUBLIC DOMAIN
** 2008-04-18
** Converted to Spin2 by Terry E. Trapp, KE4PJW
** 2023-01-15
}}
PUB inplaceDecode(in_ptr) : rt | out_ptr,i,in,char,size
{{ Decodes a base64 encoded string in-place. Returns the size of the decoded data. }}
out_ptr:=in_ptr
size:=0
repeat
ifnot BYTE[in_ptr]
quit
repeat i from 0 to 3
char:=BYTE[in_ptr++]
'repeat while (char:=BYTE[in_ptr++])==" "
ifnot char
BYTE[@in][i]:="="
in_ptr--
quit
else
BYTE[@in][i]:=char
i:=base64_decode_4(@in,out_ptr)
out_ptr+=i
size+=i
debug(udec(size))
while char AND i==3
BYTE[out_ptr]:=0
debug(udec(size))
return (size)
pri base64_tlu(char) : rt | i
case char
"A".."Z": return (char-"A")
"a".."z": return (char-"a"+26)
"0".."9": return (char-"0"+52)
"+": return (62)
"/": return (63)
other: return (0)
PUB base64_decode_4(inptr,outptr) : rt | retVal,i,out
out:=0
retVal:=3
repeat i from 0 to 3
debug(udec(i))
if(BYTE[inptr][i]=="=")
case i
3: retVal:=2
2: retVal:=1
1: retVal:=0
0: retVal:=0
quit
out|= base64_tlu(BYTE[inptr][i])<<((3-i)*6)
if retVal
repeat i from 0 to retVal-1
BYTE[outptr][i]:=BYTE[@out][2-i]
return (retVal)
CON
{{
┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ TERMS OF USE: MIT License │
├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation │
│files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, │
│modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software│
│is furnished to do so, subject to the following conditions: │
│ │
│The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.│
│ │
│THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE │
│WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR │
│COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
│ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
}}
ke4pjw
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