From 789895b4b9f99668b8b772f271d07d1ce3115742 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Fri, 5 Oct 2018 15:40:31 +0800
Subject: *update

---
 src/libjin/Graphics/Utf8.cpp | 68 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 src/libjin/Graphics/Utf8.cpp

(limited to 'src/libjin/Graphics/Utf8.cpp')

diff --git a/src/libjin/Graphics/Utf8.cpp b/src/libjin/Graphics/Utf8.cpp
new file mode 100644
index 0000000..1a79d43
--- /dev/null
+++ b/src/libjin/Graphics/Utf8.cpp
@@ -0,0 +1,68 @@
+#include <stdlib.h>
+#include <string.h>
+#include "Utf8.h"
+
+namespace jin
+{
+namespace graphics
+{
+
+    /* utf8 byte string to unicode codepoint */
+    static const char *utf8toCodepoint(const char *p, unsigned *res) {
+        unsigned x, mask, shift;
+        switch (*p & 0xf0) {
+        case 0xf0:  mask = 0x07;  shift = 18;   break;
+        case 0xe0:  mask = 0x0f;  shift = 12;   break;
+        case 0xc0:
+        case 0xd0:  mask = 0x1f;  shift = 6;   break;
+        default:
+            *res = *p;
+            return p + 1;
+        }
+        x = (*p & mask) << shift;
+        do {
+            if (*(++p) == '\0') {
+                *res = x;
+                return p;
+            }
+            shift -= 6;
+            x |= (*p & 0x3f) << shift;
+        } while (shift);
+        *res = x;
+        return p + 1;
+    }
+
+    Utf8::Utf8(const char* raw, unsigned int length)
+    {
+        _length = length;
+        _raw = (char*)calloc(1, length);
+        memcpy(_raw, raw, length);
+    }
+
+    Utf8::Iterator Utf8::getIterator()
+    {
+        return Iterator(*this);
+    }
+
+    Utf8::~Utf8()
+    {
+        free(_raw);
+        _raw = nullptr;
+        _length = 0;
+    }
+
+    Utf8::Iterator::Iterator(const Utf8& utf8)
+        : _utf8(utf8)
+    {
+        _p = utf8._raw;
+    }
+
+    Codepoint Utf8::Iterator::get()
+    {
+        Codepoint c; 
+        _p = utf8toCodepoint(_p, &c);
+        return c;
+    }
+
+}
+}
\ No newline at end of file
-- 
cgit v1.1-26-g67d0