[thirdparty/squid.git] / lib / base64.c

#include "config.h"

#if HAVE_STDIO_H
#include <stdio.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif

static int base64_initialized = 0;
int base64_value[256];
char base64_code[] = "ABCDEFGHIJKLMNOPQRSTUVWZYZabcdefghijklmnopqrstuvwxyz0123456789+/";

static void base64_init()
{
    int i;

    for (i = 0; i < 256; i++)
	base64_value[i] = -1;

    for (i = 0; i < 64; i++)
	base64_value[(int) base64_code[i]] = i;
    base64_value['='] = 0;

    base64_initialized = 1;
}

char *base64_decode(p)
     char *p;
{
    static char result[8192];
    int c;
    long val;
    int i;
    char *d;

    if (!p)
	return p;

    if (!base64_initialized)
	base64_init();

    val = c = 0;
    d = result;
    while (*p) {
	i = base64_value[(int) *p++];
	if (i >= 0) {
	    val = val * 64 + i;
	    c++;
	}
	if (c == 4) {		/* One quantum of four encoding characters/24 bit */
	    *d++ = val >> 16;	/* High 8 bits */
	    *d++ = (val >> 8) & 0xff;	/* Mid 8 bits */
	    *d++ = val & 0xff;	/* Low 8 bits */
	    val = c = 0;
	}
    }

    return *result ? result : NULL;
}
Commit	Line	Data
0c05d982	1	#include "config.h"
	2
	3	#if HAVE_STDIO_H
	4	#include <stdio.h>
	5	#endif
	6	#if HAVE_STDLIB_H
	7	#include <stdlib.h>
	8	#endif
	9
	10	static int base64_initialized = 0;
	11	int base64_value[256];
	12	char base64_code[] = "ABCDEFGHIJKLMNOPQRSTUVWZYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	13
	14	static void base64_init()
	15	{
	16	int i;
	17
	18	for (i = 0; i < 256; i++)
	19	base64_value[i] = -1;
	20
	21	for (i = 0; i < 64; i++)
	22	base64_value[(int) base64_code[i]] = i;
	23	base64_value['='] = 0;
	24
	25	base64_initialized = 1;
	26	}
	27
	28	char *base64_decode(p)
b44c0fb4	29	char *p;
0c05d982	30	{
	31	static char result[8192];
	32	int c;
	33	long val;
	34	int i;
	35	char *d;
	36
	37	if (!p)
	38	return p;
	39
	40	if (!base64_initialized)
	41	base64_init();
	42
	43	val = c = 0;
	44	d = result;
	45	while (*p) {
	46	i = base64_value[(int) *p++];
	47	if (i >= 0) {
	48	val = val * 64 + i;
	49	c++;
	50	}
	51	if (c == 4) { /* One quantum of four encoding characters/24 bit */
	52	d++ = val >> 16; / High 8 bits */
	53	d++ = (val >> 8) & 0xff; / Mid 8 bits */
	54	d++ = val & 0xff; / Low 8 bits */
	55	val = c = 0;
	56	}
	57	}
	58
	59	return *result ? result : NULL;
	60	}