1 files changed, 47 insertions, 0 deletions
diff --git a/zap/source/any/str/utf8dec.c b/zap/source/any/str/utf8dec.c
new file mode 100644
index 0000000..add8697
--- /dev/null
+++ b/zap/source/any/str/utf8dec.c
@@ -0,0 +1,47 @@
+/*
+ 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/str.h>
+
+void zap_utf8dec(zap_i02 * dest,zap_i8 const * src) {
+ for (;;++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;
+ }
+}