rewrite text convertion

1 files changed, 63 insertions, 0 deletions

diff --git a/utf8.cpp b/utf8.cpp
new file mode 100644
index 0000000..026d16e
--- /dev/null
+++ b/utf8.cpp
@@ -0,0 +1,63 @@
+/*
+    Brainuino Aleph
+
+    Copyright (C) 2012  Dmitry Mikhirev
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "utf8.h"
+#include <string.h>
+
+utf8::utf8 (char* string)
+{
+  bytes = strlen(string);
+  _string = (char *)malloc(bytes + 1);
+  strcpy(_string, string);
+  chars = 0;
+  for (_index = 0; _index < bytes; _index++) {
+    if (_string[_index] & 0x80 == 0) {
+      chars++;
+    } else if (_string[_index] & 0x20 == 0) {
+      chars += 2;
+      _index++;
+    } else if (_string[_index] & 0x10 == 0) {
+      chars += 3;
+      _index += 2;
+    } else if (_string[_index] & 0x8 == 0) {
+      chars += 4;
+      _index += 3;
+    }
+  }
+  _index = 0;
+}
+
+int32_t utf8::get()
+{
+  int32_t code;
+  if (_string[_index] & 0x80 == 0) {
+    code = int32_t(_string[_index]);
+    _index++;
+  } else if (_string[_index] & 0x20 == 0) {
+    code = int32_t(_string[_index] & 0x1f) << 6 | int32_t(_string[_index+1] & 0x3f);
+    _index += 2;
+  } else if (_string[_index] & 0x10 == 0) {
+    code = int32_t(_string[_index] & 0xf) << 12 | int32_t(_string[_index+1] & 0x3f) << 6 | int32_t(_string[_index+2] & 0x3f);
+    _index += 3;
+  } else if (_string[_index] & 0x8 == 0) {
+    code = int32_t(_string[_index] & 0x7) << 18 | int32_t(_string[_index+1] & 0x3f) << 12 | int32_t(_string[_index+2] & 0x3f) << 6 | int32_t(_string[_index+3] & 0x3f);
+  }
+  if (_index > bytes) _index = 0;
+  return code;
+}