base64 impl now escapes dots. does not really respect buflen
This commit is contained in:
Erik Ekman
parent
82ac77da7e
commit
ba8f2cfac1
180
src/base64.c
180
src/base64.c
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@ -19,6 +19,7 @@
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#include <string.h>
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#include "encoding.h"
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#include "common.h"
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#include "base64.h"
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static const char cb64[] =
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@ -26,6 +27,11 @@ static const char cb64[] =
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static unsigned char rev64[128];
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static int reverse_init = 0;
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#define REV64(x) rev64[(int) (x)]
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#define MODE (cb64[62])
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#define P62 (cb64[62])
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#define P63 (cb64[63])
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static struct encoder base64_encoder =
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{
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"BASE64",
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@ -44,7 +50,136 @@ struct encoder
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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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return 0;
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}
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static void
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findesc(int *count, unsigned char *esc, char c1, char c2, char c3, char c4)
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{
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int min1 = 0;
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int min2 = 0;
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int num1 = 0xFF;
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int num2 = 0xFE;
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int i;
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/* check if no more escapes needed */
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if (count[62] == 0 && count[63] == 0) {
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esc[0] = P62;
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esc[1] = P62;
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return;
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}
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for (i = 0; i < 62; i++) {
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if (i == c1 || i == c2 || i == c3 || i == c4) {
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continue;
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}
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if (count[i] < num1) {
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min2 = min1;
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num2 = num1;
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min1 = i;
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num1 = count[i];
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} else if (count[i] < num2) {
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min2 = i;
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num2 = count[i];
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}
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}
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esc[0] = cb64[min1];
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esc[1] = cb64[min2];
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}
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static void
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escape_chars(char *buf, size_t buflen)
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{
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int counter[64];
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int escapes;
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int reset;
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int i;
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unsigned char temp[4096];
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unsigned char *r;
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unsigned char *w;
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unsigned char *e;
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unsigned char esc[2];
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memset(counter, 0, sizeof(counter));
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esc[0] = P62;
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esc[1] = P63;
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/* first, find the number of times each token is used */
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r = (unsigned char *) buf;
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w = temp;
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while (*r) {
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counter[REV64(*r)]++;
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*w++ = *r++;
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}
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/* check if work needed */
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if (counter[62] == 0 && counter[63] == 0)
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return;
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r = temp;
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w = (unsigned char *) buf;
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reset = 1;
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escapes = 0;
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/* check a block for esc chars */
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while (*r) {
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if (reset == 0 && escapes == 0 && (
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r[0] == esc[0] || r[1] == esc[0] ||r[2] == esc[0] ||r[2] == esc[0] ||
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r[0] == esc[1] || r[1] == esc[1] ||r[2] == esc[1] ||r[2] == esc[1])) {
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/* last set of escape chars were unused.
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* if we reset last escape switch then we dont have to switch now */
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/* change last ecape switch to 999 (RESET) */
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e[1] = MODE;
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e[2] = MODE;
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/* store default esc chars */
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esc[0] = P62;
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esc[1] = P63;
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reset = 1;
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}
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if (r[0] == esc[0] || r[1] == esc[0] ||r[2] == esc[0] ||r[2] == esc[0] ||
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r[0] == esc[1] || r[1] == esc[1] ||r[2] == esc[1] ||r[2] == esc[1]) {
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/* switch escape chars */
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escapes = 0;
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reset = 0;
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/* find 2 suitable escape chars */
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findesc(counter, esc, REV64(r[0]), REV64(r[1]), REV64(r[2]), REV64(r[3]));
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/* store escape switch position */
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e = w;
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/* write new escape chars */
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*w++ = MODE;
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*w++ = esc[0];
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*w++ = esc[1];
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}
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for (i = 0; i < 4; i++) {
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if (r[i])
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counter[REV64(r[i])]--;
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}
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for (i = 0; i < 4; i++) {
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if (r[i] == P62) {
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r[i] = esc[0];
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escapes++;
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} else if (r[i] == P63) {
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r[i] = esc[1];
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escapes++;
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}
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}
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*w++ = *r++;
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*w++ = *r++;
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*w++ = *r++;
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*w++ = *r++;
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}
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}
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int
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@ -52,12 +187,21 @@ 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 c;
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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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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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/* how many chars can we encode within the buf */
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maxsize = 3 * (*buflen / 4 - 1) - 1;
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@ -82,6 +226,8 @@ base64_encode(char *buf, size_t *buflen, const void *data, size_t size)
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}
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*p = 0;
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escape_chars(buf, *buflen);
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/* store number of bytes from data that was used */
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*buflen = size;
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@ -89,7 +235,6 @@ base64_encode(char *buf, size_t *buflen, const void *data, size_t size)
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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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@ -123,6 +268,9 @@ base64_decode(void *buf, size_t *buflen, const char *str, size_t slen)
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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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unsigned char block[4];
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unsigned char prot62;
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unsigned char prot63;
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int len;
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int i;
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@ -142,10 +290,34 @@ base64_decode(void *buf, size_t *buflen, const char *str, size_t slen)
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if (*buflen < newsize) {
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slen = maxsize;
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}
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prot62 = P62;
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prot63 = P63;
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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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for (p = str; *p; p += 4) {
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if (*p == MODE) {
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p++;
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if (p[0] == MODE && p[1] == MODE) {
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/* reset escape chars */
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prot62 = P62;
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prot63 = P63;
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p += 2;
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} else {
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prot62 = *p++;
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prot63 = *p++;
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}
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}
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for (i = 0; i < 4; i++) {
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block[i] = p[i];
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if (prot62 == block[i]) {
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block[i] = P62;
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} else if (prot63 == block[i]) {
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block[i] = P63;
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}
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}
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len = decode_token(block, (unsigned char *) q, slen);
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q += len;
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slen -= 4;
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@ -31,6 +31,34 @@ static struct tuple
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} testpairs[] = {
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{ "iodinetestingtesting", "Aw8KAw4LDgvZDgLUz2rLC2rPBMC" },
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{ "abc123", "ywjJmtiZ" },
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{
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"\xFF\xEF\x7C\xEF\xAE\x78\xDF\x6D\x74\xCF\x2C\x70\xBE\xEB\x6C\xAE\xAA\x68"
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"\x9E\x69\x64\x8E\x28\x60\x7D\xE7\x5C\x6D\xA6\x58\x5D\x65\x54\x4D\x24\x50"
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"\x3C\xE3\x4C\x2C\xA2\x48\x1C\x61\x44\x0C\x20\x40\x3F\x3F\x3C\xEF\xAE\x78"
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"\xDF\x6D\x74\xCF\x2C\x70\xBE\xEB\x6C\xAE\xAA\x68\x9E\x69\x64\x8E\x28\x60"
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"\x7D\xE7\x5C\x6D\xA6\x58\x5D\x65\x54\x4D\x24\x50\x3C\xE3\x4C\x2C\xA2\x48"
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"\x1C\x61\x44\x0C\x20\x40\xFF\xEF\x7C\xEF\xAE\x78\xDF\x6D\x74\xCF\x2C\x70"
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"\xBE\xEB\x6C\xAE\xAA\x68\x9E\x69\x64\x8E\x28\x60\x7D\xE7\x5C\x6D\xA6\x58"
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"\x5D\x65\x54\x4D\x24\x50\x3C\xE3\x4C\x2C\xA2\x48\x1C\x61\x44\x0C\x20\x40",
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"9abba876543210-ZYXWVUTSRQPONMLKJIHGFEDCBAzyxwvutsrqponmlkjihgfe999dcbapZ"
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"776543210-ZYXWVUTSRQPONMLKJIHGFEDCBAzyxwvutsrqponmlkjihgfedcba9abba87654"
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"3210-ZYXWVUTSRQPONMLKJIHGFEDCBAzyxwvutsrqponmlkjihgfe999dcba"
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},
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{
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"\xFF\xEF\x7C\xEF\xAE\x78\xDF\x6D\x74\xCF\x2C\x70\xBE\xEB\x6C\xAE\xAA\x68"
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"\x9E\x69\x64\x8E\x28\x60\x7D\xE7\x5C\x6D\xA6\x58\x5D\x65\x54\x4D\x24\x50"
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"\x3C\xE3\x4C\x2C\xA2\x48\x1C\x61\x44\x0C\x20\x40\x3F\x3F\x3C\xEF\xAE\x78"
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"\xDF\x6D\x74\xCF\x2C\x70\xBE\xEB\x6C\xAE\xA1\x61\x91\x61\x61\x81\x28\x60"
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"\x7D\xE7\x5C\x6D\xA6\x58\x5D\x65\x54\x4D\x24\x50\x3C\xE3\x4C\x2C\xA2\x48"
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"\x1C\x61\x44\x0C\x20\x40\xFF\xEF\x7C\xEF\xAE\x78\xDF\x6D\x74\xCF\x2C\x70"
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"\xBE\xEB\x6C\xAE\xA1\x61\x91\x61\x61\x81\x28\x60\x7D\xE7\x5C\x6D\xA6\x58"
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"\x5D\x65\x54\x4D\x24\x50\x3C\xE3\x4C\x2C\xA2\x48\x1C\x61\x44\x0C\x20\x40",
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"9IJJI876543210-ZYXWVUTSRQPONMLK9LMJIHGFEDCBAzyxwvutsrqponmlkjihgfedcbapZ"
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"776543210-ZYXWVUTSRQfHKwfHGsHGFEDCBAzyxwvutsrqponmlkjihgfedcbaML87654321"
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"0-ZYXWVUTSRQfHKwfHGsHGFEDCBAzyxwvutsrqponmlkjihgfedcba"
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},
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{ NULL, NULL }
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};
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