+static int
+decode_ccs_conversion (int conv_type, int code_point)
+{
+ if ( conv_type == CONVERSION_IDENTICAL )
+ {
+ return code_point;
+ }
+ if ( conv_type == CONVERSION_94x60 )
+ {
+ int row = code_point >> 8;
+ int cell = code_point & 255;
+
+ if (row < 16 + 32)
+ return -1;
+ else if (row < 16 + 32 + 30)
+ return (row - (16 + 32)) * 94 + cell - 33;
+ else if (row < 18 + 32 + 30)
+ return -1;
+ else if (row < 18 + 32 + 60)
+ return (row - (18 + 32)) * 94 + cell - 33;
+ }
+ else if ( conv_type == CONVERSION_94x94x60 )
+ {
+ int plane = code_point >> 16;
+ int row = (code_point >> 8) & 255;
+ int cell = code_point & 255;
+
+ if (row < 16 + 32)
+ return -1;
+ else if (row < 16 + 32 + 30)
+ return
+ (plane - 33) * 94 * 60
+ + (row - (16 + 32)) * 94
+ + cell - 33;
+ else if (row < 18 + 32 + 30)
+ return -1;
+ else if (row < 18 + 32 + 60)
+ return
+ (plane - 33) * 94 * 60
+ + (row - (18 + 32)) * 94
+ + cell - 33;
+ }
+ else if ( conv_type == CONVERSION_BIG5_1 )
+ {
+ unsigned int I
+ = (((code_point >> 8) & 0x7F) - 33) * 94
+ + (( code_point & 0x7F) - 33);
+ unsigned char b1 = I / (0xFF - 0xA1 + 0x7F - 0x40) + 0xA1;
+ unsigned char b2 = I % (0xFF - 0xA1 + 0x7F - 0x40);
+
+ b2 += b2 < 0x3F ? 0x40 : 0x62;
+ return (b1 << 8) | b2;
+ }
+ else if ( conv_type == CONVERSION_BIG5_2 )
+ {
+ unsigned int I
+ = (((code_point >> 8) & 0x7F) - 33) * 94
+ + (( code_point & 0x7F) - 33)
+ + BIG5_SAME_ROW * (0xC9 - 0xA1);
+ unsigned char b1 = I / (0xFF - 0xA1 + 0x7F - 0x40) + 0xA1;
+ unsigned char b2 = I % (0xFF - 0xA1 + 0x7F - 0x40);
+
+ b2 += b2 < 0x3F ? 0x40 : 0x62;
+ return (b1 << 8) | b2;
+ }
+ return -1;
+}
+