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/*
Copyright 2022-2023 Gabriel Jensen.
This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
If a copy of the MPL was not distributed with this file, You can obtain one at <https://mozilla.org/MPL/2.0>.
*/
#include <zap/mem.h>
void zap_utf8dec(zap_i02 * const _dest,zap_i8 const * const _src) {
zap_i02 * dest;
zap_i8 const * src;
for (dest = _dest,src = _src;;++dest) {
zap_i8 const oct = *src;
if (oct == 0x0u) {
break;
}
if (oct >= 0xF0u) { /* Four octets. */
zap_i02 chr = ((zap_i02)oct ^ 0xF0u) << 0x12u;
++src;
chr += ((zap_i02)*src ^ 0x80u) << 0xCu;
++src;
chr += ((zap_i02)*src ^ 0x80u) << 0x6u;
++src;
chr += (zap_i02)*src ^ 0x80u;
++src;
*dest = chr;
continue;
}
if (oct >= 0xE0u) { /* Three octets. */
zap_i02 chr = ((zap_i02)oct ^ 0xE0u) << 0xCu;
++src;
chr += ((zap_i02)*src ^ 0x80u) << 0x6u;
++src;
chr += (zap_i02)*src ^ 0x80u;
++src;
*dest = chr;
continue;
}
if (oct >= 0xC0u) { /* Two octets. */
zap_i02 chr = ((zap_i02)oct ^ 0xC0u) << 0x6u;
++src;
chr += (zap_i02)*src ^ 0x80u;
++src;
*dest = chr;
continue;
}
/* One octet. */
*dest = oct;
++src;
}
}
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