1 files changed, 42 insertions, 0 deletions

diff --git a/utf16.cpp b/utf16.cpp
new file mode 100644
index 0000000..eedb521
--- /dev/null
+++ b/utf16.cpp
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdint.h>
+
+void bitprint( uint16_t u )
+{
+        for( int i = 15; i >= 0; i-- )
+                printf("%c", (u&(1<<i))?'1':'0');
+        printf("\n");
+}
+
+void bitprint( uint32_t u )
+{
+        for( int i = 31; i >= 0; i-- )
+                printf("%c", (u&(1<<i))?'1':'0');
+        printf("\n");
+}
+
+void utoutf16( uint32_t in, uint16_t &outHi, uint16_t &outLo )
+{
+        outHi = (((in-0x10000)>>10)&0x3FF)| 0xD800u;
+        outLo = ((in-0x10000)&0x3FF)| 0xDC00u;
+        printf("0x%X == 0x%X, 0x%X\n", in, outHi, outLo );
+}
+
+int32_t utf16tou( uint16_t hi, uint16_t lo )
+{
+        return (((uint32_t)hi&0x3FF)<<10 | lo&0x3FF)+0x10000;
+}
+
+int main()
+{
+        bitprint( 0xD800u );
+        bitprint( 0xDC00u );
+        uint16_t hi, lo;
+        utoutf16( 0x1D11E, hi, lo ); // Cat face with wry smile
+        utoutf16( 0x10FFFD, hi, lo ); // Cat face with wry smile
+        utoutf16( 0x1F63C, hi, lo ); // Cat face with wry smile
+        bitprint( hi );
+        bitprint( lo );
+        printf("0x%X\n", utf16tou( hi, lo ) );
+        return 0;
+}