Base64 encode data: Difference between revisions
Content added Content deleted
(Add entry for SenseTalk) |
m (→{{header|REXX}}: fixed a typo, added whitespace.) |
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A much higher value for '''chunk''' could be used for modern systems or implementations. |
A much higher value for '''chunk''' could be used for modern systems or implementations. |
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<lang rexx>/*REXX program converts text (from a file or the C.L.) to a base64 text string. */ |
<lang rexx>/*REXX program converts text (from a file or the C.L.) to a base64 text string. */ |
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parse arg iFID @ /* |
parse arg iFID @ /*obtain optional arguments from the CL*/ |
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if iFID=='' | iFID=="," then iFID='favicon.ico' /*Not specified? Then use the default.*/ |
if iFID=='' | iFID=="," then iFID='favicon.ico' /*Not specified? Then use the default.*/ |
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chunk= |
chunk= 20000 /*# of bytes to read a file at one time*/ |
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/*If @ isn't a blank, then use CL text.*/ |
/*If @ isn't a blank, then use CL text.*/ |
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if @='' then do s=1 by chunk until y=='' /* " " is " " " " the file*/ |
if @='' then do s=1 by chunk until y=='' /* " " is " " " " the file*/ |
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y=charin(iFID, s, chunk) |
y= charin(iFID, s, chunk) /*read a chunk of the file, assign to Y*/ |
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@=@ || y |
@= @ || y /*append the chunk (Y) to the @ var*/ |
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end /*s*/ /* [↑] read a chunk of the file ──► @ */ |
end /*s*/ /* [↑] read a chunk of the file ──► @ */ |
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t=base64(@) |
t= base64(@) /*convert the @ string to base 64.*/ |
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say center(' input', 79, "─"); say @ /*show the header and the input text.*/ |
say center(' input', 79, "─"); say @ /*show the header and the input text.*/ |
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say center('base64', 79, "─"); say t /* " " " " " base64 " */ |
say center('base64', 79, "─"); say t /* " " " " " base64 " */ |
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do i=0 for 64 /*process each char in the Z string. */ |
do i=0 for 64 /*process each char in the Z string. */ |
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!.i=substr(z, i+1, 1) |
!.i= substr(z, i + 1, 1) /*assign a char of Z to a ! element*/ |
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end /*i*/ |
end /*i*/ |
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b=x2b( c2x(Q) )0000000000000000 |
b= x2b( c2x(Q) )0000000000000000 /*Q ──► binary, add some zero padding.*/ |
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L=length(Q) * 8 |
L= length(Q) * 8 /*compute Q's length (in bits). */ |
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do j=1 by 6 to L /*traipse through bit string by six. */ |
do j=1 by 6 to L /*traipse through bit string by six. */ |
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_=x2d( b2x( substr(b, j, 6) |
_= x2d( b2x( substr(b, j, 6) ) ) /*compute index into the BASE64 table. */ |
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$=$ || !._ |
$= $ || !._ /*append to $ (the output string). */ |
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end /*j*/ |
end /*j*/ |
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/* [↓] maybe append equal signs to $. */ |
/* [↓] maybe append equal signs to $. */ |
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