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/*
Copyright 2022 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/priv.h>
#include <zap/mem.h>
void zap_utf8dec(zap_chr8 const * const _in,zap_chr20 * const _out) {
zap_chr8 const * in = _in;
zap_chr20 * out = _out;
for (;;++out) {
zap_chr8 const oct = *in;
if (oct >= 0xF0u) { /* Four octets. */
zap_chr20 chr = ((zap_chr20)oct ^ 0xF0u) << 0x12u;
++in;
chr += ((zap_chr20)*in ^ 0x80u) << 0xCu;
++in;
chr += ((zap_chr20)*in ^ 0x80u) << 0x6u;
++in;
chr += (zap_chr20)*in ^ 0x80u;
++in;
*out = chr;
continue;
}
if (oct >= 0xE0u) { /* Three octets. */
zap_chr20 chr = ((zap_chr20)oct ^ 0xE0u) << 0xCu;
++in;
chr += ((zap_chr20)*in ^ 0x80u) << 0x6u;
++in;
chr += (zap_chr20)*in ^ 0x80u;
++in;
*out = chr;
continue;
}
if (oct >= 0xC0u) { /* Two octets. */
zap_chr20 chr = ((zap_chr20)oct ^ 0xC0u) << 0x6u;
++in;
chr += (zap_chr20)*in ^ 0x80u;
++in;
*out = chr;
continue;
}
/* One octet. */
*out = oct;
++in;
if (oct == 0x0u) {break;}
}
}
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