base64.h File Reference

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Functions
int	base64_decode (size_t in_len, const char *in, size_t out_len, unsigned char *out)

Function Documentation

base64_decode()

int base64_decode	(	size_t	in_len,
		const char *	in,
		size_t	out_len,
		unsigned char *	out
	)

Definition at line 42 of file base64.c.

References base64dec_tab, and isspace.

Referenced by authBasic().

                                                                                                       {
    unsigned int ii, io;
    uint32_t v;
    unsigned int rem;

    for(io=0,ii=0,v=0,rem=0;ii<in_len;ii++) {
        unsigned char ch;
        if(isspace((int)in[ii])) continue;
        if(in[ii]=='=') break; /* stop at = */
        ch=base64dec_tab[(unsigned int)in[ii]];
        if(ch==255) break; /* stop at a parse error */
        v=(v<<6)|ch;
        rem+=6;
        if(rem>=8) {
            rem-=8;
            if(io>=out_len) return -1; /* truncation is failure */
            out[io++]=(v>>rem)&255;
        }
    }
    if(rem>=8) {
        rem-=8;
        if(io>=out_len) return -1; /* truncation is failure */
        out[io++]=(v>>rem)&255;
    }
    return io;
}

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