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This commit is contained in:
Erik Ekman 2007-06-10 23:13:07 +00:00
parent ba8f2cfac1
commit 331e1ab247
1 changed files with 15 additions and 8 deletions
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23
src/base64.c
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@ -59,15 +59,15 @@ findesc(int *count, unsigned char *esc, char c1, char c2, char c3, char c4)
int min1 = 0; int min1 = 0;
int min2 = 0; int min2 = 0;
int num1 = 0xFF; int num1 = 0xFF; /* a very big number */
int num2 = 0xFE; int num2 = 0xFE; /* a nearly as big number */
int i; int i;
/* check if no more escapes needed */ /* check if no more escapes needed */
if (count[62] == 0 && count[63] == 0) { if (count[62] == 0 && count[63] == 0) {
esc[0] = P62; esc[0] = MODE;
esc[1] = P62; esc[1] = MODE;
return; return;
} }
@ -130,9 +130,9 @@ escape_chars(char *buf, size_t buflen)
r[0] == esc[0] || r[1] == esc[0] ||r[2] == esc[0] ||r[2] == esc[0] || r[0] == esc[0] || r[1] == esc[0] ||r[2] == esc[0] ||r[2] == esc[0] ||
r[0] == esc[1] || r[1] == esc[1] ||r[2] == esc[1] ||r[2] == esc[1])) { r[0] == esc[1] || r[1] == esc[1] ||r[2] == esc[1] ||r[2] == esc[1])) {
/* last set of escape chars were unused. /* last set of escape chars were unused.
* if we reset last escape switch then we dont have to switch now */ * if we reset last escape switch then maybe we dont have to switch now */
/* change last ecape switch to 999 (RESET) */ /* change the latest escape switch to 999 (RESET) */
e[1] = MODE; e[1] = MODE;
e[2] = MODE; e[2] = MODE;
@ -142,6 +142,8 @@ escape_chars(char *buf, size_t buflen)
reset = 1; reset = 1;
} }
/* these two if blocks can not be combined because a block can contain both
* char 9 and/or . and the current escape chars. */
if (r[0] == esc[0] || r[1] == esc[0] ||r[2] == esc[0] ||r[2] == esc[0] || if (r[0] == esc[0] || r[1] == esc[0] ||r[2] == esc[0] ||r[2] == esc[0] ||
r[0] == esc[1] || r[1] == esc[1] ||r[2] == esc[1] ||r[2] == esc[1]) { r[0] == esc[1] || r[1] == esc[1] ||r[2] == esc[1] ||r[2] == esc[1]) {
/* switch escape chars */ /* switch escape chars */
@ -160,11 +162,13 @@ escape_chars(char *buf, size_t buflen)
*w++ = esc[1]; *w++ = esc[1];
} }
/* update counter on remaining chars */
for (i = 0; i < 4; i++) { for (i = 0; i < 4; i++) {
if (r[i]) if (r[i])
counter[REV64(r[i])]--; counter[REV64(r[i])]--;
} }
/* do the escaping */
for (i = 0; i < 4; i++) { for (i = 0; i < 4; i++) {
if (r[i] == P62) { if (r[i] == P62) {
r[i] = esc[0]; r[i] = esc[0];
@ -175,6 +179,7 @@ escape_chars(char *buf, size_t buflen)
} }
} }
/* copy back to buf */
*w++ = *r++; *w++ = *r++;
*w++ = *r++; *w++ = *r++;
*w++ = *r++; *w++ = *r++;
@ -296,6 +301,7 @@ base64_decode(void *buf, size_t *buflen, const char *str, size_t slen)
q = buf; q = buf;
for (p = str; *p; p += 4) { for (p = str; *p; p += 4) {
/* handle escape instructions */
if (*p == MODE) { if (*p == MODE) {
p++; p++;
if (p[0] == MODE && p[1] == MODE) { if (p[0] == MODE && p[1] == MODE) {
@ -309,6 +315,7 @@ base64_decode(void *buf, size_t *buflen, const char *str, size_t slen)
prot63 = *p++; prot63 = *p++;
} }
} }
/* since the str is const, we unescape in another buf */
for (i = 0; i < 4; i++) { for (i = 0; i < 4; i++) {
block[i] = p[i]; block[i] = p[i];
if (prot62 == block[i]) { if (prot62 == block[i]) {