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Embedded WebSockets Experiment

Core/arch/iputil.c@0:6dee052a3fa4, 2011-07-26 (annotated)

User	Revision	Line number	New contents of line
nandgate	0:6dee052a3fa4	1	#include "iputil.h"
nandgate	0:6dee052a3fa4	2
nandgate	0:6dee052a3fa4	3	unsigned int base64enc_len(const char *str) {
nandgate	0:6dee052a3fa4	4	return (((strlen(str)-1)/3)+1)<<2;
nandgate	0:6dee052a3fa4	5	}
nandgate	0:6dee052a3fa4	6
nandgate	0:6dee052a3fa4	7	void base64enc(const char input, unsigned int length, char output) {
nandgate	0:6dee052a3fa4	8	static const char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
nandgate	0:6dee052a3fa4	9	unsigned int c, c1, c2, c3;
nandgate	0:6dee052a3fa4	10	for(unsigned int i = 0, j = 0; i<length; i+=3,j+=4) {
nandgate	0:6dee052a3fa4	11	c1 = ((((unsigned char)((unsigned char )&input[i]))));
nandgate	0:6dee052a3fa4	12	c2 = (length>i+1)?((((unsigned char)((unsigned char )&input[i+1])))):0;
nandgate	0:6dee052a3fa4	13	c3 = (length>i+2)?((((unsigned char)((unsigned char )&input[i+2])))):0;
nandgate	0:6dee052a3fa4	14
nandgate	0:6dee052a3fa4	15	c = ((c1 & 0xFC) >> 2);
nandgate	0:6dee052a3fa4	16	output[j+0] = base64[c];
nandgate	0:6dee052a3fa4	17	c = ((c1 & 0x03) << 4) \| ((c2 & 0xF0) >> 4);
nandgate	0:6dee052a3fa4	18	output[j+1] = base64[c];
nandgate	0:6dee052a3fa4	19	c = ((c2 & 0x0F) << 2) \| ((c3 & 0xC0) >> 6);
nandgate	0:6dee052a3fa4	20	output[j+2] = (length>i+1)?base64[c]:'=';
nandgate	0:6dee052a3fa4	21	c = (c3 & 0x3F);
nandgate	0:6dee052a3fa4	22	output[j+3] = (length>i+2)?base64[c]:'=';
nandgate	0:6dee052a3fa4	23	}
nandgate	0:6dee052a3fa4	24	output[(((length-1)/3)+1)<<2] = '\0';
nandgate	0:6dee052a3fa4	25	}