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https://github.com/yarrick/iodine.git
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added base64 codec
This commit is contained in:
Erik Ekman
parent
1e7486bdd2
commit
7c53be08c0
3 changed files with 268 additions and 0 deletions
159
src/base64.c
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159
src/base64.c
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/*
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* Copyright (c) 2006-2007 Bjorn Andersson <flex@kryo.se>, Erik Ekman <yarrick@kryo.se>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "encoding.h"
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#include "base64.h"
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static const char cb64[] =
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"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-0123456789.";
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static unsigned char rev64[128];
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static int reverse_init = 0;
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static struct encoder base64_encoder =
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{
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"BASE64",
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base64_encode,
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base64_decode,
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base64_handles_dots,
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base64_handles_dots
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};
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struct encoder
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*get_base64_encoder()
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{
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return &base64_encoder;
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}
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int
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base64_handles_dots()
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{
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return 1;
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}
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int
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base64_encode(char *buf, size_t *buflen, const void *data, size_t size)
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{
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size_t newsize;
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size_t maxsize;
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unsigned char *s;
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unsigned char *p;
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unsigned char *q;
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int i;
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memset(buf, 0, *buflen);
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/* how many chars can we encode within the buf */
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maxsize = 3 * (*buflen / 4 - 1) - 1;
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/* how big will the encoded data be */
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newsize = 4 * (size / 3 + 1) + 1;
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/* if the buffer is too small, eat some of the data */
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if (*buflen < newsize) {
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size = maxsize;
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}
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p = s = (unsigned char *) buf;
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q = (unsigned char *)data;
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for(i=0;i<size;i+=3) {
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p[0] = cb64[((q[0] & 0xfc) >> 2)];
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p[1] = cb64[(((q[0] & 0x03) << 4) | ((q[1] & 0xf0) >> 4))];
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p[2] = (i+1 < size) ? cb64[((q[1] & 0x0f) << 2 ) | ((q[2] & 0xc0) >> 6)] : '\0';
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p[3] = (i+2 < size) ? cb64[(q[2] & 0x3f)] : '\0';
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q += 3;
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p += 4;
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}
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*p = 0;
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/* store number of bytes from data that was used */
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*buflen = size;
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return strlen(buf) - 1;
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}
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#define DECODE_ERROR 0xffffffff
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#define REV64(x) rev64[(int) (x)]
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static int
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decode_token(const unsigned char *t, unsigned char *data, size_t len)
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{
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if (len < 2)
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return 0;
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data[0] = ((REV64(t[0]) & 0x3f) << 2) |
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((REV64(t[1]) & 0x30) >> 4);
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if (len < 3)
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return 1;
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data[1] = ((REV64(t[1]) & 0x0f) << 4) |
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((REV64(t[2]) & 0x3c) >> 2);
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if (len < 4)
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return 2;
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data[2] = ((REV64(t[2]) & 0x03) << 6) |
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(REV64(t[3]) & 0x3f);
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return 3;
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}
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int
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base64_decode(void *buf, size_t *buflen, const char *str, size_t slen)
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{
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unsigned char *q;
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size_t newsize;
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size_t maxsize;
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const char *p;
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unsigned char c;
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int len;
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int i;
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if (!reverse_init) {
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for (i = 0; i < 64; i++) {
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c = cb64[i];
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rev64[(int) c] = i;
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}
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reverse_init = 1;
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}
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/* chars needed to decode slen */
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newsize = 3 * (slen / 4 + 1) + 1;
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/* encoded chars that fit in buf */
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maxsize = 4 * (*buflen / 3 + 1) + 1;
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/* if the buffer is too small, eat some of the data */
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if (*buflen < newsize) {
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slen = maxsize;
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}
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q = buf;
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for (p = str; *p && strchr(cb64, *p); p += 4) {
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len = decode_token((unsigned char *) p, (unsigned char *) q, slen);
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q += len;
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slen -= 4;
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if (len < 3)
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break;
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}
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*q = '\0';
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return q - (unsigned char *) buf;
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}
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25
src/base64.h
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25
src/base64.h
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@ -0,0 +1,25 @@
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/*
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* Copyright (c) 2006-2007 Bjorn Andersson <flex@kryo.se>, Erik Ekman <yarrick@kryo.se>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef __BASE64_H__
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#define __BASE64_H__
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struct encoder *get_base64_encoder(void);
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int base64_handles_dots();
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int base64_encode(char *, size_t *, const void *, size_t);
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int base64_decode(void *, size_t *, const char *, size_t);
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#endif
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84
tests/base64.c
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84
tests/base64.c
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@ -0,0 +1,84 @@
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/*
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* Copyright (c) 2006 Bjorn Andersson <flex@kryo.se>, Erik Ekman <yarrick@kryo.se>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <check.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "encoding.h"
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#include "base64.h"
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#include "test.h"
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static struct tuple
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{
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char *a;
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char *b;
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} testpairs[] = {
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{ "iodinetestingtesting", "Aw8KAw4LDgvZDgLUz2rLC2rPBMC" },
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{ "abc123", "ywjJmtiZ" },
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{ NULL, NULL }
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};
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START_TEST(test_base64_encode)
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{
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size_t len;
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char buf[4096];
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int val;
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int i;
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for (i = 0; testpairs[i].a != NULL; i++) {
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len = sizeof(buf);
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val = base64_encode(buf, &len, testpairs[i].a, strlen(testpairs[i].a));
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fail_unless(val > 0, strerror(errno));
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fail_unless(strcmp(buf, testpairs[i].b) == 0,
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va_str("'%s' != '%s'", buf, testpairs[i].b));
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}
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}
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END_TEST
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START_TEST(test_base64_decode)
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{
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size_t len;
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char buf[4096];
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int val;
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int i;
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for (i = 0; testpairs[i].a != NULL; i++) {
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len = sizeof(buf);
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val = base64_decode(buf, &len, testpairs[i].b, strlen(testpairs[i].b));
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fail_unless(val > 0, strerror(errno));
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fail_unless(buf != NULL, "buf == NULL");
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fail_unless(strcmp(buf, testpairs[i].a) == 0,
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va_str("'%s' != '%s'", buf, testpairs[i].a));
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}
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}
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END_TEST
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TCase *
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test_base64_create_tests()
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{
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TCase *tc;
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tc = tcase_create("Base64");
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tcase_add_test(tc, test_base64_encode);
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tcase_add_test(tc, test_base64_decode);
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return tc;
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}
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