From 7d5f055547e70fa93ee9ac944e62f8d657b9dc55 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Fri, 19 Oct 2018 08:36:44 +0800
Subject: =?UTF-8?q?*=E4=BF=AE=E6=94=B9=E6=96=87=E4=BB=B6=E5=90=8D?=
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---
 src/libjin/Graphics/Font/je_decoder.cpp | 93 +++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 src/libjin/Graphics/Font/je_decoder.cpp

(limited to 'src/libjin/Graphics/Font/je_decoder.cpp')

diff --git a/src/libjin/Graphics/Font/je_decoder.cpp b/src/libjin/Graphics/Font/je_decoder.cpp
new file mode 100644
index 0000000..20695e7
--- /dev/null
+++ b/src/libjin/Graphics/Font/je_decoder.cpp
@@ -0,0 +1,93 @@
+#include <stdlib.h>
+#include <string.h>
+#include "je_decoder.h"
+
+namespace jin
+{
+	namespace graphics
+	{
+
+		/* utf8 byte string to unicode codepoint */
+		static const char *utf8toCodepoint(const char *p, unsigned *res) {
+			return nullptr;
+
+		}
+
+		/////////////////////////////////////////////////////////////////////////////
+		// decoders
+		/////////////////////////////////////////////////////////////////////////////
+
+		const void* Utf8::decode(const void* data, Codepoint* res) const
+		{
+			const char* p = (char*)data;
+			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;
+		}
+
+		const void* Utf8::next(const void* data) const
+		{
+			const char* p = (char*)data;
+			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:
+				return p + 1;
+			}
+			x = (*p & mask) << shift;
+			do {
+				if (*(++p) == '\0') {
+					return p;
+				}
+				shift -= 6;
+				x |= (*p & 0x3f) << shift;
+			} while (shift);
+			return p + 1;
+		}
+	/*
+		const void* Utf16::decode(const void* data, Codepoint* res) const
+		{
+			return nullptr;
+		}
+
+		const void* Utf16::next(const void* data) const
+		{
+			return nullptr;
+		}
+	*/
+		const void* Ascii::decode(const void* data, Codepoint* res) const
+		{
+			const char* p = (char*)data;
+			*res = *p;
+			return p + 1;
+		}
+
+		const void* Ascii::next(const void* data) const
+		{
+			const char* p = (char*)data;
+			return p + 1;
+		}
+
+	} // namespace graphics
+} // namespace jin
\ No newline at end of file
-- 
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