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Add public-domain base64 code from github.com/OrangeTide/libcgi

This commit is contained in:
Brendan Shanks 2017-07-24 20:33:57 -07:00
parent c5c76dda60
commit 29183ac171
2 changed files with 131 additions and 0 deletions
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113
macssh/source/ssh/base64.c Normal file
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/* base64.c : base-64 / MIME encode/decode */
/* PUBLIC DOMAIN - Jon Mayo - November 13, 2003 */
/* $Id: base64.c 156 2007-07-12 23:29:10Z orange $ */
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <ctype.h>
#include "base64.h"
static const uint8_t base64enc_tab[64]= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const uint8_t base64dec_tab[256]= {
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255, 62,255,255,255, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255, 0,255,255,
255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,255,255,255,255,255,
255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
};
void base64encode(const unsigned char in[3], unsigned char out[4], int count)
{
out[0]=base64enc_tab[(in[0]>>2)];
out[1]=base64enc_tab[((in[0]&3)<<4)|(in[1]>>4)];
out[2]=count<2 ? '=' : base64enc_tab[((in[1]&15)<<2)|(in[2]>>6)];
out[3]=count<3 ? '=' : base64enc_tab[(in[2]&63)];
}
int base64decode(const char in[4], char out[3])
{
uint8_t v[4];
v[0]=base64dec_tab[(unsigned)in[0]];
v[1]=base64dec_tab[(unsigned)in[1]];
v[2]=base64dec_tab[(unsigned)in[2]];
v[3]=base64dec_tab[(unsigned)in[3]];
out[0]=(v[0]<<2)|(v[1]>>4);
out[1]=(v[1]<<4)|(v[2]>>2);
out[2]=(v[2]<<6)|(v[3]);
return (v[0]|v[1]|v[2]|v[3])!=255 ? in[3]=='=' ? in[2]=='=' ? 1 : 2 : 3 : 0;
}
/* decode a base64 string in one shot */
int base64_decode(size_t in_len, const char *in, size_t out_len, unsigned char *out) {
unsigned ii, io;
uint_least32_t v;
unsigned rem;
for(io=0,ii=0,v=0,rem=0;ii<in_len;ii++) {
unsigned char ch;
if(isspace(in[ii])) continue;
if(in[ii]=='=') break; /* stop at = */
ch=base64dec_tab[(unsigned)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;
}
int base64_encode(size_t in_len, const unsigned char *in, size_t out_len, char *out) {
unsigned ii, io;
uint_least32_t v;
unsigned rem;
for(io=0,ii=0,v=0,rem=0;ii<in_len;ii++) {
unsigned char ch;
ch=in[ii];
v=(v<<8)|ch;
rem+=8;
while(rem>=6) {
rem-=6;
if(io>=out_len) return -1; /* truncation is failure */
out[io++]=base64enc_tab[(v>>rem)&63];
}
}
if(rem) {
v<<=(6-rem);
if(io>=out_len) return -1; /* truncation is failure */
out[io++]=base64enc_tab[v&63];
}
while(io&3) {
if(io>=out_len) return -1; /* truncation is failure */
out[io++]='=';
}
if(io>=out_len) return -1; /* no room for null terminator */
out[io]=0;
return io;
}
/* vim: ts=4 sts=0 noet sw=4
*/

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macssh/source/ssh/base64.h Normal file
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/* base64.h : base-64 / MIME encode/decode */
/* PUBLIC DOMAIN - Jon Mayo - November 13, 2003 */
/* $Id: base64.h 128 2007-04-20 08:20:40Z orange $ */
#ifndef BASE64_H
#define BASE64_H
#include <stddef.h>
/* used to encode 3 bytes into 4 base64 digits */
void base64encode(const unsigned char in[3], unsigned char out[4], int count);
/* used to decode 4 base64 digits into 3 bytes */
int base64decode(const char in[4], char out[3]);
/* encode binary data into base64 digits with MIME style === pads */
int base64_encode(size_t in_len, const unsigned char *in, size_t out_len, char *out);
/* decode base64 digits with MIME style === pads into binary data */
int base64_decode(size_t in_len, const char *in, size_t out_len, unsigned char *out);
#endif /* BASE64_H */