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/*++
Copyright (c) 1991-2000, Microsoft Corporation All rights reserved.
Module Name:
utf.h
Abstract:
This file contains the header information for the UTF module of NLS.
Revision History:
02-06-96 JulieB Created.
--*/
//
// Constant Declarations.
//
#define ASCII 0x007f
#define SHIFT_IN '+' // beginning of a shift sequence
#define SHIFT_OUT '-' // end of a shift sequence
#define UTF8_2_MAX 0x07ff // max UTF8 2-byte sequence (32 * 64 = 2048)
#define UTF8_1ST_OF_2 0xc0 // 110x xxxx
#define UTF8_1ST_OF_3 0xe0 // 1110 xxxx
#define UTF8_1ST_OF_4 0xf0 // 1111 xxxx
#define UTF8_TRAIL 0x80 // 10xx xxxx
#define HIGHER_6_BIT(u) ((u) >> 12)
#define MIDDLE_6_BIT(u) (((u) & 0x0fc0) >> 6)
#define LOWER_6_BIT(u) ((u) & 0x003f)
#define BIT7(a) ((a) & 0x80)
#define BIT6(a) ((a) & 0x40)
#define HIGH_SURROGATE_START 0xd800
#define HIGH_SURROGATE_END 0xdbff
#define LOW_SURROGATE_START 0xdc00
#define LOW_SURROGATE_END 0xdfff
/////////////////////////
// //
// Unicode -> UTF-7 //
// //
/////////////////////////
//
// Convert one Unicode to 2 2/3 Base64 chars in a shifted sequence.
// Each char represents a 6-bit portion of the 16-bit Unicode char.
//
CONST char cBase64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" // A : 000000 .... 011001 ( 0 - 25)
"abcdefghijklmnopqrstuvwxyz" // a : 011010 .... 110011 (26 - 51)
"0123456789" // 0 : 110100 .... 111101 (52 - 61)
"+/"; // + : 111110, / : 111111 (62 - 63)
//
// To determine if an ASCII char needs to be shifted.
// 1 : to be shifted
// 0 : not to be shifted
//
CONST BOOLEAN fShiftChar[] ={ 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, // Null, Tab, LF, CR
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, // Space '() +,-./
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, // 0123456789: ?
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // ABCDEFGHIJKLMNO
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, // PQRSTUVWXYZ
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // abcdefghijklmno
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1 // pqrstuvwxyz
};
/////////////////////////
// //
// UTF-7 -> Unicode //
// //
/////////////////////////
//
// Convert a Base64 char in a shifted sequence to a 6-bit portion of a
// Unicode char.
// -1 means it is not a Base64
//
CONST char nBitBase64[] ={ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, // + /
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, // 0123456789
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // ABCDEFGHIJKLMNO
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, // PQRSTUVWXYZ
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // abcdefghijklmno
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 // pqrstuvwxyz
};
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