home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Collection of Internet
/
Collection of Internet.iso
/
protocol
/
standard
/
network
/
utf
/
utf.c
< prev
Wrap
Text File
|
1993-07-14
|
12KB
|
384 lines
/*
* Copyright (C) 1992, Metis Technology, Inc.
*
* @(#)utf.c 1.4 11/2/92
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the Metis Library General Public License as
* published by Metis Technology, Inc.; either version 2, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Metis Library General Public License for more details.
*
* In order to receive a copy of the Metis Library General Public License,
* write to Metis Technology, Inc., 358 Windsor St, Cambridge, MA 02141, USA.
* This license may also be retrieved by anonymous FTP from the file
* "pub/LibraryPublicLicense" on the host METIS.COM [140.186.33.40].
*
*
* Universal Character Set (UCS) Transformation Format (UTF) Utilities
*
* This file contains four functions which support conversion to and from
* DIS10646-1.2:1992(E) UCS-2 and UCS-4 character code representations
* and the UTF multi-octet format. The detailed algorithm is specified in
* ANNEX F of the above standard.
*
* The four functions defined below are:
*
* int UCS2ToUTF ( UTFCHAR * utf_str,
* UCS2CHAR * ucs_str,
* int utf_str_size )
*
* int UTFToUCS2 ( UCS2CHAR * ucs_str,
* UTFCHAR * utf_str,
* int ucs_str_size )
*
* int UCS4ToUTF ( UTFCHAR * utf_str,
* UCS4CHAR * ucs_str,
* int utf_str_size )
*
* int UTFToUCS4 ( UCS4CHAR * ucs_str,
* UTFCHAR * utf_str,
* int ucs_str_size )
*
*
* For each function, the first argument represents a target buffer whose
* size is specified by the third argument. This size is not in bytes
* but in element units according to the element type; e.g., bytes for
* UTFCHAR, shorts for UCS2CHAR, and longs for UCS4CHAR (these types are
* defined below).
*
* The source string pointed at by the second argument of each function
* is transformed and copied into the target buffer. The number of elements
* consumed from the source string is returned. In the case of UTFToUCS2,
* if an invalid UCS-2 code value would be produced from the UTF string
* data, i.e., a UTF string encoding a value outside the UCS-2 encoding
* space, then the transformation is terminated and a -1 value is returned
* indicating an error.
*
* If the target buffer is consumed prior to exhausting the source string,
* transformation will be terminated. In every case, except the condition
* specified above for UTFToUCS2, the target buffer is null-terminated
* at the termination of transformation. Therefore, the size of the target
* buffer should be adequate to store the transformed data plus a null
* terminator (of the appropriate width, depending on the target type).
*
* If the target buffer was not large enough to hold one target element,
* then none of the source is consumed, and a null terminator is placed
* at the beginning of the target buffer. In this case, a 0 value is
* returned indicating that none of the source was consumed.
*
* Notes:
*
* 1. Performance might be marginally improved by unrolling a few loops.
*
* 2. Interoperability between the UTF produced by this code has not
* been tested against another UTF implementation.
*
* 3. Upper bounds on target buffer sizes are as follows:
*
* UCS2ToUTF Length ( ucs_str ) * 3 + 1
* UTFToUCS2 Length ( utf_str ) + 1
*
* UCS4ToUTF Length ( ucs_str ) * 5 + 1
* UTFToUCS4 Length ( utf_str ) + 1
*
* Length(x) returns the number of elements (not bytes) in x. The
* result is the number of elements that the target buffer should be
* able to hold. Room for the null terminator is included in these bounds.
*
* 4. Please report any bugs or suggestions to Glenn Adams, <glenn@metis.com>.
*
*/
typedef unsigned long CARD32;
typedef unsigned short CARD16;
typedef unsigned char CARD8;
typedef CARD16 UCS2CHAR;
typedef CARD32 UCS4CHAR;
typedef CARD8 UTFCHAR;
#define UCS_RANGE0 0x00000000
#define UCS_RANGE1 0x000000A0
#define UCS_RANGE2 0x00000100
#define UCS_RANGE3 0x00004016
#define UCS_RANGE4 0x00038E2E
#define UTF_RANGE0 0x00
#define UTF_RANGE1 0xA0
#define UTF_RANGE2 0xA1
#define UTF_RANGE3 0xF6
#define UTF_RANGE4 0xFC
static UTFCHAR T[] = {
0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40,
0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50,
0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60,
0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70,
0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0xa0, 0xa1,
0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9,
0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1,
0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9,
0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc1,
0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9,
0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1,
0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9,
0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1,
0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1,
0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9,
0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, 0x00, 0x01,
0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x7f,
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
};
static UTFCHAR U[] = {
0xbe, 0xbf, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5,
0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd,
0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5,
0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd,
0xde, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e,
0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26,
0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e,
0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46,
0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e,
0x4f, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56,
0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0xdf,
0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65,
0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d,
0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75,
0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d,
0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,
0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d,
0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,
0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d,
0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5,
0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,
0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5,
0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd,
};
int
UCS2ToUTF ( utf_str, ucs_str, utf_str_size )
UTFCHAR * utf_str;
UCS2CHAR * ucs_str;
int utf_str_size;
{
register UCS2CHAR *p;
register UTFCHAR *sp, *esp;
CARD32 ucs;
if ( ! utf_str || ! ucs_str || ! utf_str_size )
return 0;
sp = utf_str;
esp = & sp [ utf_str_size - 1 ];
for ( p = ucs_str; ucs = (CARD32) *p; p++ ) {
if ( ucs < UCS_RANGE1 ) {
if ( ( esp - sp ) < 1 )
break;
*sp++ = (UTFCHAR) ucs;
} else if ( ucs < UCS_RANGE2 ) {
if ( ( esp - sp ) < 2 )
break;
*sp++ = (UTFCHAR) 0xA0;
*sp++ = (UTFCHAR) ucs;
} else if ( ucs < UCS_RANGE3 ) {
register CARD32 y = ucs - 0x100;
register CARD32 d = 0xBE;
register int i;
if ( ( esp - sp ) < 2 )
break;
*sp++ = (UTFCHAR) ( 0xA1 + y / d );
for ( i = 0; i < 1; i++ )
*sp++ = T [ ( y / ( d /= 0xBE ) ) % 0xBE ];
} else {
register CARD32 y = ucs - 0x4016;
register CARD32 d = 0xBE * 0xBE;
register int i;
if ( ( esp - sp ) < 3 )
break;
*sp++ = (UTFCHAR) ( 0xF6 + y / d );
for ( i = 0; i < 2; i++ )
*sp++ = T [ ( y / ( d /= 0xBE ) ) % 0xBE ];
}
}
*sp++ = (UTFCHAR) 0x00;
return (int) ( p - ucs_str );
}
int
UTFToUCS2 ( ucs_str, utf_str, ucs_str_size )
UCS2CHAR * ucs_str;
UTFCHAR * utf_str;
int ucs_str_size;
{
register UCS2CHAR *p, *ep;
register UTFCHAR *sp, utf;
CARD32 ucs;
if ( ! ucs_str || ! utf_str || ! ucs_str_size )
return 0;
p = ucs_str;
ep = & p [ ucs_str_size - 1 ];
for ( sp = utf_str; utf = *sp; sp++ ) {
if ( utf < UTF_RANGE1 )
ucs = (CARD32) utf;
else if ( utf < UTF_RANGE2 )
ucs = (CARD32) *++sp;
else if ( utf < UTF_RANGE3 )
ucs = (CARD32) ( utf - 0xA1 ) * 0xBE + U [ *++sp ] + 0x100;
else if ( utf < UTF_RANGE4 ) {
register int i;
ucs = (CARD32) ( utf - 0xF6 );
for ( i = 0; i < 2; i++ )
ucs = ucs * 0xBE + U [ *++sp ];
ucs += 0x4016;
} else {
register int i;
ucs = (CARD32) ( utf - 0xFC );
for ( i = 0; i < 4; i++ )
ucs = ucs * 0xBE + U [ *++sp ];
ucs += 0x38E2E;
}
if ( ( ep - p ) < 1 )
break;
if ( ucs > 0xffff )
return -1;
*p++ = ucs;
}
*p++ = (UCS2CHAR) 0x0000;
return (int) ( sp - utf_str );
}
int
UCS4ToUTF ( utf_str, ucs_str, utf_str_size )
UTFCHAR * utf_str;
UCS4CHAR * ucs_str;
int utf_str_size;
{
register UCS4CHAR *p;
register UTFCHAR *sp, *esp;
CARD32 ucs;
if ( ! utf_str || ! ucs_str || ! utf_str_size )
return 0;
sp = utf_str;
esp = & sp [ utf_str_size - 1 ];
for ( p = ucs_str; ucs = (CARD32) *p; p++ ) {
if ( ucs < UCS_RANGE1 ) {
if ( ( esp - sp ) < 1 )
break;
*sp++ = (UTFCHAR) ucs;
} else if ( ucs < UCS_RANGE2 ) {
if ( ( esp - sp ) < 2 )
break;
*sp++ = (UTFCHAR) 0xA0;
*sp++ = (UTFCHAR) ucs;
} else if ( ucs < UCS_RANGE3 ) {
register CARD32 y = ucs - 0x100;
register CARD32 d = 0xBE;
register int i;
if ( ( esp - sp ) < 2 )
break;
*sp++ = (UTFCHAR) ( 0xA1 + y / d );
for ( i = 0; i < 1; i++ )
*sp++ = T [ ( y / ( d /= 0xBE ) ) % 0xBE ];
} else if ( ucs < UCS_RANGE4 ) {
register CARD32 y = ucs - 0x4016;
register CARD32 d = 0xBE * 0xBE;
register int i;
if ( ( esp - sp ) < 3 )
break;
*sp++ = (UTFCHAR) ( 0xF6 + y / d );
for ( i = 0; i < 2; i++ )
*sp++ = T [ ( y / ( d /= 0xBE ) ) % 0xBE ];
} else {
register CARD32 y = ucs - 0x38E2E;
register CARD32 d = 0xBE * 0xBE * 0xBE * 0xBE;
register int i;
if ( ( esp - sp ) < 5 )
break;
*sp++ = (UTFCHAR) ( 0xFC + y / d );
for ( i = 0; i < 4; i++ )
*sp++ = T [ ( y / ( d /= 0xBE ) ) % 0xBE ];
}
}
*sp++ = (UTFCHAR) 0x00;
return (int) ( p - ucs_str );
}
int
UTFToUCS4 ( ucs_str, utf_str, ucs_str_size )
UCS4CHAR * ucs_str;
UTFCHAR * utf_str;
int ucs_str_size;
{
register UCS4CHAR *p, *ep;
register UTFCHAR *sp, utf;
CARD32 ucs;
if ( ! ucs_str || ! utf_str || ! ucs_str_size )
return 0;
p = ucs_str;
ep = & p [ ucs_str_size - 1 ];
for ( sp = utf_str; utf = *sp; sp++ ) {
if ( utf < UTF_RANGE1 )
ucs = (CARD32) utf;
else if ( utf < UTF_RANGE2 )
ucs = (CARD32) *++sp;
else if ( utf < UTF_RANGE3 )
ucs = (CARD32) ( utf - 0xA1 ) * 0xBE + U [ *++sp ] + 0x100;
else if ( utf < UTF_RANGE4 ) {
register int i;
ucs = (CARD32) ( utf - 0xF6 );
for ( i = 0; i < 2; i++ )
ucs = ucs * 0xBE + U [ *++sp ];
ucs += 0x4016;
} else {
register int i;
ucs = (CARD32) ( utf - 0xFC );
for ( i = 0; i < 4; i++ )
ucs = ucs * 0xBE + U [ *++sp ];
ucs += 0x38E2E;
}
if ( ( ep - p ) < 1 )
break;
*p++ = ucs;
}
*p++ = (UCS4CHAR) 0x0000;
return (int) ( sp - utf_str );
}