v4k-git-backup/engine/split/3rd_base64.h

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2024-03-26 16:15:02 +00:00
// base64 de/encoder. Based on code by Jon Mayo - November 13, 2003 (PUBLIC DOMAIN).
// - rlyeh, public domain
#ifndef BASE64_H
#define BASE64_H
unsigned base64_bounds(unsigned size);
char* base64_encode(const void *inp, unsigned inlen); // free() after use
char* base64_decode(const char *inp, unsigned inlen); // array_free() after use
#endif
#ifdef BASE64_C
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stddef.h>
#include <ctype.h>
#define BASE64_ENCODE_OUT_SIZE(s) ((unsigned int)((((s) + 2) / 3) * 4 + 1))
#define BASE64_DECODE_OUT_SIZE(s) ((unsigned int)(((s) / 4) * 3))
unsigned base64_bounds(unsigned size) {
return BASE64_ENCODE_OUT_SIZE(size);
}
char* base64_encode(const void *inp, unsigned inlen) { // free() after use
unsigned outlen = base64_bounds(inlen);
char *out_ = MALLOC(outlen);
out_[outlen] = 0;
uint_least32_t v;
unsigned ii, io, rem;
char *out = (char *)out_;
const unsigned char *in = (const unsigned char *)inp;
const uint8_t base64enc_tab[]= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
for(io = 0, ii = 0, v = 0, rem = 0; ii < inlen; ii ++) {
unsigned char ch;
ch = in[ii];
v = (v << 8) | ch;
rem += 8;
while (rem >= 6) {
rem -= 6;
if (io >= outlen)
return (FREE(out_), NULL); /* truncation is failure */
out[io ++] = base64enc_tab[(v >> rem) & 63];
}
}
if (rem) {
v <<= (6 - rem);
if (io >= outlen)
return (FREE(out_), NULL); /* truncation is failure */
out[io ++] = base64enc_tab[v & 63];
}
while(io&3) {
if(io>=outlen) return (FREE(out_), NULL); /* truncation is failure */
out[io++]='=';
}
if(io>=outlen) return (FREE(out_), NULL); /* no room for null terminator */
out[io]=0;
return out_;
}
#ifdef array_resize
array(char) base64_decode(const char *inp, unsigned inlen) { // array_free() after use
#if 0
unsigned long outlen = BASE64_DECODE_OUT_SIZE(inlen);
array(char) out_ = 0; array_resize(out_, outlen+1);
if( base64_decodex((const unsigned char *)inp, (unsigned long)inlen, (unsigned char *)out_, &outlen) != CRYPT_OK ) {
array_free(out_);
return 0;
}
array_resize(out_, outlen);
out_[outlen] = 0;
return out_;
#else
unsigned outlen = BASE64_DECODE_OUT_SIZE(inlen);
array(char) out_ = 0; array_resize(out_, outlen);
// based on code by Jon Mayo - November 13, 2003 (PUBLIC DOMAIN)
uint_least32_t v;
unsigned ii, io, rem;
char *out = (char *)out_;
const unsigned char *in = (const unsigned char *)inp;
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, 254, 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 };
for (io = 0, ii = 0,v = 0, rem = 0; ii < inlen; ii ++) {
unsigned char ch;
if (isspace(in[ii]))
continue;
if ((in[ii]=='=') || (!in[ii]))
break; /* stop at = or null character*/
ch = base64dec_tab[(unsigned char)in[ii]];
if (ch == 255)
break; /* stop at a parse error */
v = (v<<6) | ch;
rem += 6;
if (rem >= 8) {
rem -= 8;
if (io >= outlen)
return (array_free(out_), NULL); /* truncation is failure */
out[io ++] = (v >> rem) & 255;
}
}
if (rem >= 8) {
rem -= 8;
if (io >= outlen)
return (array_free(out_), NULL); /* truncation is failure */
out[io ++] = (v >> rem) & 255;
}
return (array_resize(out_, io), out_);
#endif
}
#endif // array_resize
#endif // BASE64_C