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/*----------------------------------------------------------------------------*/
/* Xymon monitor library. */
/* */
/* This is a library module, part of libxymon. */
/* It contains routines for Base64 encoding and decoding. */
/* */
/* Copyright (C) 2002-2011 Henrik Storner <henrik@storner.dk> */
/* */
/* This program is released under the GNU General Public License (GPL), */
/* version 2. See the file "COPYING" for details. */
/* */
/*----------------------------------------------------------------------------*/
static char rcsid[] = "$Id: encoding.c 6712 2011-07-31 21:01:52Z storner $";
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include "libxymon.h"
static char b64chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
char *base64encode(unsigned char *buf)
{
unsigned char c0, c1, c2;
unsigned int n0, n1, n2, n3;
unsigned char *inp, *outp;
unsigned char *result;
result = malloc(4*(strlen(buf)/3 + 1) + 1);
inp = buf; outp=result;
while (strlen(inp) >= 3) {
c0 = *inp; c1 = *(inp+1); c2 = *(inp+2);
n0 = (c0 >> 2); /* 6 bits from c0 */
n1 = ((c0 & 3) << 4) + (c1 >> 4); /* 2 bits from c0, 4 bits from c1 */
n2 = ((c1 & 15) << 2) + (c2 >> 6); /* 4 bits from c1, 2 bits from c2 */
n3 = (c2 & 63); /* 6 bits from c2 */
*outp = b64chars[n0]; outp++;
*outp = b64chars[n1]; outp++;
*outp = b64chars[n2]; outp++;
*outp = b64chars[n3]; outp++;
inp += 3;
}
if (strlen(inp) == 1) {
c0 = *inp; c1 = 0;
n0 = (c0 >> 2); /* 6 bits from c0 */
n1 = ((c0 & 3) << 4) + (c1 >> 4); /* 2 bits from c0, 4 bits from c1 */
*outp = b64chars[n0]; outp++;
*outp = b64chars[n1]; outp++;
*outp = '='; outp++;
*outp = '='; outp++;
}
else if (strlen(inp) == 2) {
c0 = *inp; c1 = *(inp+1); c2 = 0;
n0 = (c0 >> 2); /* 6 bits from c0 */
n1 = ((c0 & 3) << 4) + (c1 >> 4); /* 2 bits from c0, 4 bits from c1 */
n2 = ((c1 & 15) << 2) + (c2 >> 6); /* 4 bits from c1, 2 bits from c2 */
*outp = b64chars[n0]; outp++;
*outp = b64chars[n1]; outp++;
*outp = b64chars[n2]; outp++;
*outp = '='; outp++;
}
*outp = '\0';
return result;
}
char *base64decode(unsigned char *buf)
{
static short bval[128] = { 0, };
static short bvalinit = 0;
int n0, n1, n2, n3;
unsigned char *inp, *outp;
unsigned char *result;
int bytesleft = strlen(buf);
if (!bvalinit) {
int i;
bvalinit = 1;
for (i=0; (i < strlen(b64chars)); i++) bval[(int)b64chars[i]] = i;
}
result = malloc(3*(bytesleft/4 + 1) + 1);
inp = buf; outp=result;
while (bytesleft >= 4) {
n0 = bval[*(inp+0)];
n1 = bval[*(inp+1)];
n2 = bval[*(inp+2)];
n3 = bval[*(inp+3)];
*(outp+0) = (n0 << 2) + (n1 >> 4); /* 6 bits from n0, 2 from n1 */
*(outp+1) = ((n1 & 0x0F) << 4) + (n2 >> 2); /* 4 bits from n1, 4 from n2 */
*(outp+2) = ((n2 & 0x03) << 6) + (n3); /* 2 bits from n2, 6 from n3 */
inp += 4;
bytesleft -= 4;
outp += 3;
}
*outp = '\0';
return result;
}
void getescapestring(char *msg, unsigned char **buf, int *buflen)
{
char *inp, *outp;
int outlen = 0;
inp = msg;
if (*inp == '\"') inp++; /* Skip the quote */
outp = *buf = malloc(strlen(msg)+1);
while (*inp && (*inp != '\"')) {
if (*inp == '\\') {
inp++;
if (*inp == 'r') {
*outp = '\r'; outlen++; inp++; outp++;
}
else if (*inp == 'n') {
*outp = '\n'; outlen++; inp++; outp++;
}
else if (*inp == 't') {
*outp = '\t'; outlen++; inp++; outp++;
}
else if (*inp == '\\') {
*outp = '\\'; outlen++; inp++; outp++;
}
else if (*inp == 'x') {
inp++;
if (isxdigit((int) *inp)) {
*outp = hexvalue(*inp);
inp++;
if (isxdigit((int) *inp)) {
*outp *= 16;
*outp += hexvalue(*inp);
inp++;
}
}
else {
errprintf("Invalid hex escape in '%s'\n", msg);
}
outlen++; outp++;
}
else {
errprintf("Unknown escape sequence \\%c in '%s'\n", *inp, msg);
}
}
else {
*outp = *inp;
outlen++;
inp++; outp++;
}
}
*outp = '\0';
if (buflen) *buflen = outlen;
}
unsigned char *nlencode(unsigned char *msg)
{
static unsigned char *buf = NULL;
static int bufsz = 0;
int maxneeded;
unsigned char *inp, *outp;
int n;
if (msg == NULL) msg = "";
maxneeded = 2*strlen(msg)+1;
if (buf == NULL) {
bufsz = maxneeded;
buf = (char *)malloc(bufsz);
}
else if (bufsz < maxneeded) {
bufsz = maxneeded;
buf = (char *)realloc(buf, bufsz);
}
inp = msg;
outp = buf;
while (*inp) {
n = strcspn(inp, "|\n\r\t\\");
if (n > 0) {
memcpy(outp, inp, n);
outp += n;
inp += n;
}
if (*inp) {
*outp = '\\'; outp++;
switch (*inp) {
case '|' : *outp = 'p'; outp++; break;
case '\n': *outp = 'n'; outp++; break;
case '\r': *outp = 'r'; outp++; break;
case '\t': *outp = 't'; outp++; break;
case '\\': *outp = '\\'; outp++; break;
}
inp++;
}
}
*outp = '\0';
return buf;
}
void nldecode(unsigned char *msg)
{
unsigned char *inp = msg;
unsigned char *outp = msg;
int n;
if ((msg == NULL) || (*msg == '\0')) return;
while (*inp) {
n = strcspn(inp, "\\");
if (n > 0) {
if (inp != outp) memmove(outp, inp, n);
inp += n;
outp += n;
}
/* *inp is either a backslash or a \0 */
if (*inp == '\\') {
inp++;
switch (*inp) {
case 'p': *outp = '|'; outp++; inp++; break;
case 'r': *outp = '\r'; outp++; inp++; break;
case 'n': *outp = '\n'; outp++; inp++; break;
case 't': *outp = '\t'; outp++; inp++; break;
case '\\': *outp = '\\'; outp++; inp++; break;
}
}
}
*outp = '\0';
}
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