mirror of
https://codeberg.org/grunfink/snac2.git
synced 2024-11-15 01:55:03 +00:00
420 lines
9.4 KiB
C
420 lines
9.4 KiB
C
/* copyright (c) 2022 - 2023 grunfink / MIT license */
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#ifndef _XS_ENCDEC_H
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#define _XS_ENCDEC_H
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xs_str *xs_hex_enc(const xs_val *data, int size);
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xs_val *xs_hex_dec(const xs_str *hex, int *size);
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int xs_is_hex(const char *str);
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xs_str *xs_base32_enc(const xs_val *data, int sz);
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xs_str *xs_base32hex_enc(const xs_val *data, int sz);
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xs_val *xs_base32_dec(const xs_str *data, int *size);
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xs_val *xs_base32hex_dec(const xs_str *data, int *size);
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xs_str *xs_base64_enc(const xs_val *data, int sz);
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xs_val *xs_base64_dec(const xs_str *data, int *size);
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int xs_is_base64(const char *str);
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xs_str *xs_utf8_enc(xs_str *str, unsigned int cpoint);
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#ifdef XS_IMPLEMENTATION
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/** hex **/
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xs_str *xs_hex_enc(const xs_val *data, int size)
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/* returns an hexdump of data */
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{
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xs_str *s;
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char *p;
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int n;
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p = s = xs_realloc(NULL, _xs_blk_size(size * 2 + 1));
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for (n = 0; n < size; n++) {
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snprintf(p, 3, "%02x", (unsigned char)data[n]);
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p += 2;
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}
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*p = '\0';
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return s;
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}
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xs_val *xs_hex_dec(const xs_str *hex, int *size)
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/* decodes an hexdump into data */
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{
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int sz = strlen(hex);
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xs_val *s = NULL;
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char *p;
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int n;
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if (sz % 2)
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return NULL;
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p = s = xs_realloc(NULL, _xs_blk_size(sz / 2 + 1));
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for (n = 0; n < sz; n += 2) {
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int i;
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if (sscanf(&hex[n], "%02x", &i) == 0) {
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/* decoding error */
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return xs_free(s);
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}
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else
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*p = i;
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p++;
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}
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*p = '\0';
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*size = sz / 2;
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return s;
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}
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int xs_is_hex(const char *str)
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/* returns 1 if str is an hex string */
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{
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while (*str) {
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if (strchr("0123456789abcdefABCDEF", *str++) == NULL)
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return 0;
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}
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return 1;
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}
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/** base32 */
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static char *xs_b32_tbl = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"234567=";
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static char *xs_b32hex_tbl = "0123456789"
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"ABCDEFGHIJKLMNOPQRSTUV=";
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/*
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00000|00011|11111|12222|22223|33333|33444|44444
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*/
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xs_str *xs_base32_enc_tbl(const xs_val *data, int sz, const char *b32_tbl)
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/* encodes data to base32 using a table */
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{
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xs_str *s = xs_str_new(NULL);
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unsigned char *p;
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int n;
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p = (unsigned char *)data;
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for (n = 0; n < sz; n += 5) {
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int l = sz - n;
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char enc[9] = "========";
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enc[0] = b32_tbl[(p[n] >> 3) & 0x1f];
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if (l > 1) {
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enc[1] = b32_tbl[(p[n] << 2 | p[n + 1] >> 6) & 0x1f];
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enc[2] = b32_tbl[(p[n + 1] >> 1) & 0x1f];
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if (l > 2) {
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enc[3] = b32_tbl[(p[n + 1] << 4 | p[n + 2] >> 4) & 0x1f];
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if (l > 3) {
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enc[4] = b32_tbl[(p[n + 2] << 1 | p[n + 3] >> 7) & 0x1f];
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enc[5] = b32_tbl[(p[n + 3] >> 2) & 0x1f];
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if (l > 4) {
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enc[6] = b32_tbl[(p[n + 3] << 3 | p[n + 4] >> 5) & 0x1f];
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enc[7] = b32_tbl[(p[n + 4]) & 0x1f];
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}
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else
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enc[6] = b32_tbl[(p[n + 3] << 3) & 0x1f];
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}
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else
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enc[4] = b32_tbl[(p[n + 2] << 1) & 0x1f];
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}
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else
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enc[3] = b32_tbl[(p[n + 1] << 4) & 0x1f];
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}
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else
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enc[1] = b32_tbl[(p[n] << 2) & 0x1f];
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s = xs_str_cat(s, enc);
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}
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return s;
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}
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xs_str *xs_base32_enc(const xs_val *data, int sz)
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/* encodes data to base32 */
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{
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return xs_base32_enc_tbl(data, sz, xs_b32_tbl);
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}
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xs_str *xs_base32hex_enc(const xs_val *data, int sz)
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/* encodes data to base32 with HEX alphabet (RFC4648) */
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{
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return xs_base32_enc_tbl(data, sz, xs_b32hex_tbl);
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}
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xs_val *xs_base32_dec_tbl(const xs_str *data, int *size, const char *b32_tbl)
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/* decodes data from base32 using a table */
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{
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xs_val *s = NULL;
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int sz = 0;
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char *p;
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p = (char *)data;
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/* size of data must be a multiple of 8 */
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if (strlen(p) % 8)
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return NULL;
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for (p = (char *)data; *p; p += 8) {
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int cs[8];
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int n;
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unsigned char tmp[5];
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for (n = 0; n < 8; n++) {
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char *ss = strchr(b32_tbl, p[n]);
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if (ss == NULL) {
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/* not a base32 char */
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return xs_free(s);
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}
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cs[n] = ss - b32_tbl;
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}
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n = 0;
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/* #0 byte */
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tmp[n++] = cs[0] << 3 | cs[1] >> 2;
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if (cs[2] != 32) {
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/* #1 byte */
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tmp[n++] = (cs[1] & 0x3) << 6 | cs[2] << 1 | (cs[3] & 0x10) >> 4;
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if (cs[4] != 32) {
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/* #2 byte */
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tmp[n++] = (cs[3] & 0xf) << 4 | cs[4] >> 1;
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if (cs[5] != 32) {
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/* #3 byte */
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tmp[n++] = (cs[4] & 0x1) << 7 | cs[5] << 2 | cs[6] >> 3;
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if (cs[7] != 32) {
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/* #4 byte */
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tmp[n++] = (cs[6] & 0x7) << 5 | cs[7];
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}
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}
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}
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}
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/* must be done manually because data can be pure binary */
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s = xs_realloc(s, _xs_blk_size(sz + n));
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memcpy(s + sz, tmp, n);
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sz += n;
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}
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/* asciiz it to use it as a string */
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s = xs_realloc(s, _xs_blk_size(sz + 1));
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s[sz] = '\0';
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*size = sz;
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return s;
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}
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xs_val *xs_base32_dec(const xs_str *data, int *size)
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/* decodes data from base32 */
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{
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return xs_base32_dec_tbl(data, size, xs_b32_tbl);
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}
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xs_val *xs_base32hex_dec(const xs_str *data, int *size)
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/* decodes data from base32 with HEX alphabet (RFC4648) */
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{
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return xs_base32_dec_tbl(data, size, xs_b32hex_tbl);
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}
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/** base64 */
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static char *xs_b64_tbl = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/=";
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xs_str *xs_base64_enc_tbl(const xs_val *data, int sz, const char *b64_tbl)
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/* encodes data to base64 using a table */
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{
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xs_str *s;
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unsigned char *p;
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char *i;
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int bsz, n;
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bsz = ((sz + 3 - 1) / 3) * 4;
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i = s = xs_realloc(NULL, _xs_blk_size(bsz + 1));
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p = (unsigned char *)data;
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for (n = 0; n < sz; n += 3) {
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int l = sz - n;
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if (l == 1) {
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*i++ = b64_tbl[(p[n] >> 2) & 0x3f];
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*i++ = b64_tbl[(p[n] << 4) & 0x3f];
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*i++ = '=';
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*i++ = '=';
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}
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else
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if (l == 2) {
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*i++ = b64_tbl[(p[n] >> 2) & 0x3f];
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*i++ = b64_tbl[(p[n] << 4 | p[n + 1] >> 4) & 0x3f];
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*i++ = b64_tbl[(p[n + 1] << 2) & 0x3f];
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*i++ = '=';
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}
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else {
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*i++ = b64_tbl[(p[n] >> 2) & 0x3f];
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*i++ = b64_tbl[(p[n] << 4 | p[n + 1] >> 4) & 0x3f];
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*i++ = b64_tbl[(p[n + 1] << 2 | p[n + 2] >> 6) & 0x3f];
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*i++ = b64_tbl[(p[n + 2]) & 0x3f];
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}
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}
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*i = '\0';
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return s;
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}
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xs_str *xs_base64_enc(const xs_val *data, int sz)
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/* encodes data to base64 */
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{
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return xs_base64_enc_tbl(data, sz, xs_b64_tbl);
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}
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xs_val *xs_base64_dec_tbl(const xs_str *data, int *size, const char *b64_tbl)
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/* decodes data from base64 using a table */
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{
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xs_val *s = NULL;
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int sz = 0;
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char *p;
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p = (char *)data;
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/* size of data must be a multiple of 4 */
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if (strlen(p) % 4)
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return NULL;
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for (p = (char *)data; *p; p += 4) {
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int cs[4];
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int n;
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unsigned char tmp[3];
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for (n = 0; n < 4; n++) {
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char *ss = strchr(b64_tbl, p[n]);
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if (ss == NULL) {
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/* not a base64 char */
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return xs_free(s);
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}
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cs[n] = ss - b64_tbl;
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}
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n = 0;
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/* first byte */
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tmp[n++] = cs[0] << 2 | ((cs[1] >> 4) & 0x0f);
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/* second byte */
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if (cs[2] != 64)
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tmp[n++] = cs[1] << 4 | ((cs[2] >> 2) & 0x3f);
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/* third byte */
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if (cs[3] != 64)
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tmp[n++] = cs[2] << 6 | (cs[3] & 0x3f);
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/* must be done manually because data can be pure binary */
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s = xs_realloc(s, _xs_blk_size(sz + n));
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memcpy(s + sz, tmp, n);
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sz += n;
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}
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/* asciiz it to use it as a string */
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s = xs_realloc(s, _xs_blk_size(sz + 1));
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s[sz] = '\0';
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*size = sz;
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return s;
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}
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xs_val *xs_base64_dec(const xs_str *data, int *size)
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/* decodes data from base64 */
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{
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return xs_base64_dec_tbl(data, size, xs_b64_tbl);
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}
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int xs_is_base64_tbl(const char *str, const char *b64_tbl)
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/* returns 1 if str is a base64 string, with table */
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{
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while (*str) {
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if (strchr(b64_tbl, *str++) == NULL)
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return 0;
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}
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return 1;
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}
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int xs_is_base64(const char *str)
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/* returns 1 if str is a base64 string */
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{
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return xs_is_base64_tbl(str, xs_b64_tbl);
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}
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/** utf-8 **/
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xs_str *xs_utf8_enc(xs_str *str, unsigned int cpoint)
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/* encodes an Unicode codepoint to utf8 */
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{
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unsigned char tmp[4];
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int n = 0;
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if (cpoint < 0x80)
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tmp[n++] = cpoint & 0xff;
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else
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if (cpoint < 0x800) {
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tmp[n++] = 0xc0 | (cpoint >> 6);
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tmp[n++] = 0x80 | (cpoint & 0x3f);
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}
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else
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if (cpoint < 0x10000) {
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tmp[n++] = 0xe0 | (cpoint >> 12);
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tmp[n++] = 0x80 | ((cpoint >> 6) & 0x3f);
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tmp[n++] = 0x80 | (cpoint & 0x3f);
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}
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else
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if (cpoint < 0x200000) {
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tmp[n++] = 0xf0 | (cpoint >> 18);
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tmp[n++] = 0x80 | ((cpoint >> 12) & 0x3f);
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tmp[n++] = 0x80 | ((cpoint >> 6) & 0x3f);
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tmp[n++] = 0x80 | (cpoint & 0x3f);
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}
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return xs_append_m(str, (char *)tmp, n);
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}
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#endif /* XS_IMPLEMENTATION */
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#endif /* _XS_ENCDEC_H */
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