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Backport from xs.

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default 2023-05-09 14:23:30 +02:00
parent d562c3cfed
commit 28720d4a9d
2 changed files with 1 additions and 164 deletions
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163
xs_encdec.h
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@ -7,10 +7,6 @@
xs_str *xs_hex_enc(const xs_val *data, int size);
xs_val *xs_hex_dec(const xs_str *hex, int *size);
int xs_is_hex(const char *str);
xs_str *xs_base32_enc(const xs_val *data, int sz);
xs_str *xs_base32hex_enc(const xs_val *data, int sz);
xs_val *xs_base32_dec(const xs_str *data, int *size);
xs_val *xs_base32hex_dec(const xs_str *data, int *size);
xs_str *xs_base64_enc(const xs_val *data, int sz);
xs_val *xs_base64_dec(const xs_str *data, int *size);
int xs_is_base64(const char *str);
@ -84,165 +80,6 @@ int xs_is_hex(const char *str)
}
/** base32 */
static char *xs_b32_tbl = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"234567=";
static char *xs_b32hex_tbl = "0123456789"
"ABCDEFGHIJKLMNOPQRSTUV=";
/*
00000|00011|11111|12222|22223|33333|33444|44444
*/
xs_str *xs_base32_enc_tbl(const xs_val *data, int sz, const char *b32_tbl)
/* encodes data to base32 using a table */
{
xs_str *s = xs_str_new(NULL);
unsigned char *p;
int n;
p = (unsigned char *)data;
for (n = 0; n < sz; n += 5) {
int l = sz - n;
char enc[9] = "========";
enc[0] = b32_tbl[(p[n] >> 3) & 0x1f];
if (l > 1) {
enc[1] = b32_tbl[(p[n] << 2 | p[n + 1] >> 6) & 0x1f];
enc[2] = b32_tbl[(p[n + 1] >> 1) & 0x1f];
if (l > 2) {
enc[3] = b32_tbl[(p[n + 1] << 4 | p[n + 2] >> 4) & 0x1f];
if (l > 3) {
enc[4] = b32_tbl[(p[n + 2] << 1 | p[n + 3] >> 7) & 0x1f];
enc[5] = b32_tbl[(p[n + 3] >> 2) & 0x1f];
if (l > 4) {
enc[6] = b32_tbl[(p[n + 3] << 3 | p[n + 4] >> 5) & 0x1f];
enc[7] = b32_tbl[(p[n + 4]) & 0x1f];
}
else
enc[6] = b32_tbl[(p[n + 3] << 3) & 0x1f];
}
else
enc[4] = b32_tbl[(p[n + 2] << 1) & 0x1f];
}
else
enc[3] = b32_tbl[(p[n + 1] << 4) & 0x1f];
}
else
enc[1] = b32_tbl[(p[n] << 2) & 0x1f];
s = xs_str_cat(s, enc);
}
return s;
}
xs_str *xs_base32_enc(const xs_val *data, int sz)
/* encodes data to base32 */
{
return xs_base32_enc_tbl(data, sz, xs_b32_tbl);
}
xs_str *xs_base32hex_enc(const xs_val *data, int sz)
/* encodes data to base32 with HEX alphabet (RFC4648) */
{
return xs_base32_enc_tbl(data, sz, xs_b32hex_tbl);
}
xs_val *xs_base32_dec_tbl(const xs_str *data, int *size, const char *b32_tbl)
/* decodes data from base32 using a table */
{
xs_val *s = NULL;
int sz = 0;
char *p;
p = (char *)data;
/* size of data must be a multiple of 8 */
if (strlen(p) % 8)
return NULL;
for (p = (char *)data; *p; p += 8) {
int cs[8];
int n;
unsigned char tmp[5];
for (n = 0; n < 8; n++) {
char *ss = strchr(b32_tbl, p[n]);
if (ss == NULL) {
/* not a base32 char */
return xs_free(s);
}
cs[n] = ss - b32_tbl;
}
n = 0;
/* #0 byte */
tmp[n++] = cs[0] << 3 | cs[1] >> 2;
if (cs[2] != 32) {
/* #1 byte */
tmp[n++] = (cs[1] & 0x3) << 6 | cs[2] << 1 | (cs[3] & 0x10) >> 4;
if (cs[4] != 32) {
/* #2 byte */
tmp[n++] = (cs[3] & 0xf) << 4 | cs[4] >> 1;
if (cs[5] != 32) {
/* #3 byte */
tmp[n++] = (cs[4] & 0x1) << 7 | cs[5] << 2 | cs[6] >> 3;
if (cs[7] != 32) {
/* #4 byte */
tmp[n++] = (cs[6] & 0x7) << 5 | cs[7];
}
}
}
}
/* must be done manually because data can be pure binary */
s = xs_realloc(s, _xs_blk_size(sz + n));
memcpy(s + sz, tmp, n);
sz += n;
}
/* asciiz it to use it as a string */
s = xs_realloc(s, _xs_blk_size(sz + 1));
s[sz] = '\0';
*size = sz;
return s;
}
xs_val *xs_base32_dec(const xs_str *data, int *size)
/* decodes data from base32 */
{
return xs_base32_dec_tbl(data, size, xs_b32_tbl);
}
xs_val *xs_base32hex_dec(const xs_str *data, int *size)
/* decodes data from base32 with HEX alphabet (RFC4648) */
{
return xs_base32_dec_tbl(data, size, xs_b32hex_tbl);
}
/** base64 */
static char *xs_b64_tbl = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

2
xs_version.h
View file

@ -1 +1 @@
/* d8ec27efc55ba67403e88bfbe7d2ce9905364d6d */
/* 01bea7d4a0e631c0406b358dda9cc9409362c003 */