141 lines
5.0 KiB
C
141 lines
5.0 KiB
C
// base64 de/encoder. Based on code by Jon Mayo - November 13, 2003 (PUBLIC DOMAIN).
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// - rlyeh, public domain
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#ifndef BASE64_H
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#define BASE64_H
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unsigned base64_bounds(unsigned size);
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char* base64_encode(const void *inp, unsigned inlen); // free() after use
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char* base64_decode(const char *inp, unsigned inlen); // array_free() after use
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#endif
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#ifdef BASE64_C
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <ctype.h>
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#define BASE64_ENCODE_OUT_SIZE(s) ((unsigned int)((((s) + 2) / 3) * 4 + 1))
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#define BASE64_DECODE_OUT_SIZE(s) ((unsigned int)(((s) / 4) * 3))
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unsigned base64_bounds(unsigned size) {
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return BASE64_ENCODE_OUT_SIZE(size);
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}
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char* base64_encode(const void *inp, unsigned inlen) { // free() after use
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unsigned outlen = base64_bounds(inlen);
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char *out_ = MALLOC(outlen);
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out_[outlen] = 0;
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uint_least32_t v;
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unsigned ii, io, rem;
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char *out = (char *)out_;
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const unsigned char *in = (const unsigned char *)inp;
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const uint8_t base64enc_tab[]= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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for(io = 0, ii = 0, v = 0, rem = 0; ii < inlen; ii ++) {
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unsigned char ch;
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ch = in[ii];
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v = (v << 8) | ch;
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rem += 8;
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while (rem >= 6) {
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rem -= 6;
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if (io >= outlen)
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return (FREE(out_), NULL); /* truncation is failure */
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out[io ++] = base64enc_tab[(v >> rem) & 63];
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}
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}
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if (rem) {
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v <<= (6 - rem);
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if (io >= outlen)
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return (FREE(out_), NULL); /* truncation is failure */
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out[io ++] = base64enc_tab[v & 63];
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}
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while(io&3) {
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if(io>=outlen) return (FREE(out_), NULL); /* truncation is failure */
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out[io++]='=';
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}
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if(io>=outlen) return (FREE(out_), NULL); /* no room for null terminator */
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out[io]=0;
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return out_;
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}
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#ifdef array_resize
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array(char) base64_decode(const char *inp, unsigned inlen) { // array_free() after use
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#if 0
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unsigned long outlen = BASE64_DECODE_OUT_SIZE(inlen);
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array(char) out_ = 0; array_resize(out_, outlen+1);
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if( base64_decodex((const unsigned char *)inp, (unsigned long)inlen, (unsigned char *)out_, &outlen) != CRYPT_OK ) {
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array_free(out_);
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return 0;
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}
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array_resize(out_, outlen);
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out_[outlen] = 0;
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return out_;
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#else
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unsigned outlen = BASE64_DECODE_OUT_SIZE(inlen);
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array(char) out_ = 0; array_resize(out_, outlen);
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// based on code by Jon Mayo - November 13, 2003 (PUBLIC DOMAIN)
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uint_least32_t v;
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unsigned ii, io, rem;
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char *out = (char *)out_;
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const unsigned char *in = (const unsigned char *)inp;
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const uint8_t base64dec_tab[256]= {
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
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255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
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7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
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255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
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37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
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49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255 };
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for (io = 0, ii = 0,v = 0, rem = 0; ii < inlen; ii ++) {
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unsigned char ch;
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if (isspace(in[ii]))
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continue;
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if ((in[ii]=='=') || (!in[ii]))
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break; /* stop at = or null character*/
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ch = base64dec_tab[(unsigned char)in[ii]];
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if (ch == 255)
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break; /* stop at a parse error */
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v = (v<<6) | ch;
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rem += 6;
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if (rem >= 8) {
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rem -= 8;
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if (io >= outlen)
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return (array_free(out_), NULL); /* truncation is failure */
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out[io ++] = (v >> rem) & 255;
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}
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}
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if (rem >= 8) {
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rem -= 8;
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if (io >= outlen)
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return (array_free(out_), NULL); /* truncation is failure */
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out[io ++] = (v >> rem) & 255;
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}
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return (array_resize(out_, io), out_);
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#endif
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}
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#endif // array_resize
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#endif // BASE64_C
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