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34 lines
1.2 KiB
34 lines
1.2 KiB
.TH scan_base64 3 |
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.SH NAME |
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scan_base64 \- decode base64 encoded data |
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.SH SYNTAX |
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.B #include <textcode.h> |
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size_t \fBscan_base64\fP(const char *\fIsrc\fR,char *\fIdest\fR,size_t* \fIdestlen\fR); |
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.SH DESCRIPTION |
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scan_base64 decodes base64 encoded data from src into dest. |
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It will stop when it encountes any non-valid input characters. |
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It will then write the number of decoded bytes in dest into *destlen, |
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and return the number of bytes decoded from src. |
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Note that real world base64 encoded data is sometimes permitted to |
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contain whitespace characters or new lines. This function will not allow |
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those and return the decoded data until then. |
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base64 works by taking 3 bytes of binary input and converting them into |
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4 bytes of printable ASCII. If the input ends in the middle of a base64 |
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4-byte-tuple, scan_base64 will disregard it. |
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Many base64 variants demand padding in the last block. Some don't. This |
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implementation will consume padding if it is there, but will not |
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complain if it is not. |
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.SH "RETURN VALUE" |
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scan_base64 returns the number of bytes successfully scanned and |
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processed from src. |
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.SH EXAMPLES |
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scan_base64("Zm5vcmQ=",buf,&i) -> return 8, i=5, buf="fnord" |
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.SH "SEE ALSO" |
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scan_xlong(3), scan_8long(3), fmt_ulong(3)
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