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Backport from xs.

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default 2022-09-30 10:03:35 +02:00
parent a52840414d
commit bb9992a1a9
1 changed files with 24 additions and 14 deletions
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38
xs_encdec.h
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@ -35,10 +35,13 @@ d_char *xs_hex_dec(const char *hex)
/* decodes an hexdump into data */ /* decodes an hexdump into data */
{ {
int sz = strlen(hex); int sz = strlen(hex);
d_char *s; d_char *s = NULL;
char *p; char *p;
int n; int n;
if (sz % 2)
return s;
p = s = calloc(sz / 2, 1); p = s = calloc(sz / 2, 1);
for (n = 0; n < sz; n += 2) { for (n = 0; n < sz; n += 2) {
@ -63,34 +66,37 @@ d_char *xs_base64_enc(const char *data, int sz)
{ {
d_char *s; d_char *s;
unsigned char *p; unsigned char *p;
int n; char *i;
int bsz, n;
static char *b64_tbl = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" static char *b64_tbl = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz" "abcdefghijklmnopqrstuvwxyz"
"0123456789+/"; "0123456789+/";
s = xs_str_new(NULL); bsz = ((sz + 3 - 1) / 3) * 4;
i = s = calloc(bsz + 1, 1);
p = (unsigned char *)data; p = (unsigned char *)data;
for (n = 0; n < sz; n += 3) { for (n = 0; n < sz; n += 3) {
int l = sz - n; int l = sz - n;
if (l == 1) { if (l == 1) {
s = xs_append_m(s, &b64_tbl[(p[n] >> 2) & 0x3f], 1); *i++ = b64_tbl[(p[n] >> 2) & 0x3f];
s = xs_append_m(s, &b64_tbl[(p[n] << 4) & 0x3f], 1); *i++ = b64_tbl[(p[n] << 4) & 0x3f];
s = xs_append_m(s, "==", 2); *i++ = '=';
*i++ = '=';
} }
else else
if (l == 2) { if (l == 2) {
s = xs_append_m(s, &b64_tbl[(p[n] >> 2) & 0x3f], 1); *i++ = b64_tbl[(p[n] >> 2) & 0x3f];
s = xs_append_m(s, &b64_tbl[(p[n] << 4 | p[n + 1] >> 4) & 0x3f], 1); *i++ = b64_tbl[(p[n] << 4 | p[n + 1] >> 4) & 0x3f];
s = xs_append_m(s, &b64_tbl[(p[n + 1] << 2) & 0x3f], 1); *i++ = b64_tbl[(p[n + 1] << 2) & 0x3f];
s = xs_append_m(s, "=", 1); *i++ = '=';
} }
else { else {
s = xs_append_m(s, &b64_tbl[(p[n] >> 2) & 0x3f], 1); *i++ = b64_tbl[(p[n] >> 2) & 0x3f];
s = xs_append_m(s, &b64_tbl[(p[n] << 4 | p[n + 1] >> 4) & 0x3f], 1); *i++ = b64_tbl[(p[n] << 4 | p[n + 1] >> 4) & 0x3f];
s = xs_append_m(s, &b64_tbl[(p[n + 1] << 2 | p[n + 2] >> 6) & 0x3f], 1); *i++ = b64_tbl[(p[n + 1] << 2 | p[n + 2] >> 6) & 0x3f];
s = xs_append_m(s, &b64_tbl[(p[n + 2]) & 0x3f], 1); *i++ = b64_tbl[(p[n + 2]) & 0x3f];
} }
} }
@ -110,6 +116,10 @@ d_char *xs_base64_dec(const char *data, int *size)
p = (char *)data; p = (char *)data;
/* size of data must be a multiple of 4 */
if (strlen(p) % 4)
return s;
for (p = (char *)data; *p; p += 4) { for (p = (char *)data; *p; p += 4) {
int cs[4]; int cs[4];
int n; int n;