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ultimatepp/bazaar/plugin/gdal/port/cpl_recode_stub.cpp
cxl 23ff1e7e82 .gdal moved to bazaar 
git-svn-id: svn://ultimatepp.org/upp/trunk@9273 f0d560ea-af0d-0410-9eb7-867de7ffcac7
2015-12-07 13:36:24 +00:00

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/**********************************************************************
* $Id: cpl_recode_stub.cpp 29121 2015-05-02 22:53:48Z rouault $
*
* Name: cpl_recode_stub.cpp
* Project: CPL - Common Portability Library
* Purpose: Character set recoding and char/wchar_t conversions, stub
* implementation to be used if iconv() functionality is not
* available.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
* The bulk of this code is derived from the utf.c module from FLTK. It
* was originally downloaded from:
* http://svn.easysw.com/public/fltk/fltk/trunk/src/utf.c
*
**********************************************************************
* Copyright (c) 2008, Frank Warmerdam
* Copyright 2006 by Bill Spitzak and others.
* Copyright (c) 2009-2014, Even Rouault <even dot rouault at mines-paris dot org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
**********************************************************************/
#include "cpl_string.h"
CPL_CVSID("$Id: cpl_recode_stub.cpp 29121 2015-05-02 22:53:48Z rouault $");
#ifdef CPL_RECODE_STUB
static unsigned utf8decode(const char* p, const char* end, int* len);
static unsigned utf8towc(const char* src, unsigned srclen,
wchar_t* dst, unsigned dstlen);
static unsigned utf8toa(const char* src, unsigned srclen,
char* dst, unsigned dstlen);
static unsigned utf8fromwc(char* dst, unsigned dstlen,
const wchar_t* src, unsigned srclen);
static unsigned utf8froma(char* dst, unsigned dstlen,
const char* src, unsigned srclen);
static int utf8test(const char* src, unsigned srclen);
#ifdef _WIN32
#include <windows.h>
#include <winnls.h>
static char* CPLWin32Recode( const char* src,
unsigned src_code_page, unsigned dst_code_page );
#endif
#ifdef FUTURE_NEEDS
static const char* utf8fwd(const char* p, const char* start, const char* end);
static const char* utf8back(const char* p, const char* start, const char*end);
static int utf8encode(unsigned ucs, char* buf);
static int utf8bytes(unsigned ucs);
#endif /* def FUTURE_NEEDS */
/************************************************************************/
/* ==================================================================== */
/* Stub Implementation not depending on iconv() or WIN32 API. */
/* ==================================================================== */
/************************************************************************/
static int bHaveWarned1 = FALSE;
static int bHaveWarned2 = FALSE;
static int bHaveWarned3 = FALSE;
static int bHaveWarned4 = FALSE;
static int bHaveWarned5 = FALSE;
static int bHaveWarned6 = FALSE;
/************************************************************************/
/* CPLClearRecodeStubWarningFlags() */
/************************************************************************/
void CPLClearRecodeStubWarningFlags()
{
bHaveWarned1 = FALSE;
bHaveWarned2 = FALSE;
bHaveWarned3 = FALSE;
bHaveWarned4 = FALSE;
bHaveWarned5 = FALSE;
bHaveWarned6 = FALSE;
}
/************************************************************************/
/* CPLRecodeStub() */
/************************************************************************/
/**
* Convert a string from a source encoding to a destination encoding.
*
* The only guaranteed supported encodings are CPL_ENC_UTF8, CPL_ENC_ASCII
* and CPL_ENC_ISO8859_1. Currently, the following conversions are supported :
* <ul>
* <li>CPL_ENC_ASCII -> CPL_ENC_UTF8 or CPL_ENC_ISO8859_1 (no conversion in fact)</li>
* <li>CPL_ENC_ISO8859_1 -> CPL_ENC_UTF8</li>
* <li>CPL_ENC_UTF8 -> CPL_ENC_ISO8859_1</li>
* </ul>
*
* If an error occurs an error may, or may not be posted with CPLError().
*
* @param pszSource a NULL terminated string.
* @param pszSrcEncoding the source encoding.
* @param pszDstEncoding the destination encoding.
*
* @return a NULL terminated string which should be freed with CPLFree().
*/
char *CPLRecodeStub( const char *pszSource,
const char *pszSrcEncoding,
const char *pszDstEncoding )
{
/* -------------------------------------------------------------------- */
/* If the source or destination is current locale(), we change */
/* it to ISO8859-1 since our stub implementation does not */
/* attempt to address locales properly. */
/* -------------------------------------------------------------------- */
if( pszSrcEncoding[0] == '\0' )
pszSrcEncoding = CPL_ENC_ISO8859_1;
if( pszDstEncoding[0] == '\0' )
pszDstEncoding = CPL_ENC_ISO8859_1;
/* -------------------------------------------------------------------- */
/* ISO8859 to UTF8 */
/* -------------------------------------------------------------------- */
if( strcmp(pszSrcEncoding,CPL_ENC_ISO8859_1) == 0
&& strcmp(pszDstEncoding,CPL_ENC_UTF8) == 0 )
{
int nCharCount = strlen(pszSource);
char *pszResult = (char *) CPLCalloc(1,nCharCount*2+1);
utf8froma( pszResult, nCharCount*2+1, pszSource, nCharCount );
return pszResult;
}
/* -------------------------------------------------------------------- */
/* UTF8 to ISO8859 */
/* -------------------------------------------------------------------- */
if( strcmp(pszSrcEncoding,CPL_ENC_UTF8) == 0
&& strcmp(pszDstEncoding,CPL_ENC_ISO8859_1) == 0 )
{
int nCharCount = strlen(pszSource);
char *pszResult = (char *) CPLCalloc(1,nCharCount+1);
utf8toa( pszSource, nCharCount, pszResult, nCharCount+1 );
return pszResult;
}
#ifdef _WIN32
/* ---------------------------------------------------------------------*/
/* CPXXX to UTF8 */
/* ---------------------------------------------------------------------*/
if( strncmp(pszSrcEncoding,"CP",2) == 0
&& strcmp(pszDstEncoding,CPL_ENC_UTF8) == 0 )
{
int nCode = atoi( pszSrcEncoding + 2 );
if( nCode > 0 ) {
return CPLWin32Recode( pszSource, nCode, CP_UTF8 );
}
else if( EQUAL(pszSrcEncoding, "CP_OEMCP") )
return CPLWin32Recode( pszSource, CP_OEMCP, CP_UTF8 );
}
/* ---------------------------------------------------------------------*/
/* UTF8 to CPXXX */
/* ---------------------------------------------------------------------*/
if( strcmp(pszSrcEncoding,CPL_ENC_UTF8) == 0
&& strncmp(pszDstEncoding,"CP",2) == 0 )
{
int nCode = atoi( pszDstEncoding + 2 );
if( nCode > 0 ) {
return CPLWin32Recode( pszSource, CP_UTF8, nCode );
}
}
#endif
/* -------------------------------------------------------------------- */
/* Anything else to UTF-8 is treated as ISO8859-1 to UTF-8 with */
/* a one-time warning. */
/* -------------------------------------------------------------------- */
if( strcmp(pszDstEncoding,CPL_ENC_UTF8) == 0 )
{
int nCharCount = strlen(pszSource);
char *pszResult = (char *) CPLCalloc(1,nCharCount*2+1);
if( !bHaveWarned1 )
{
bHaveWarned1 = 1;
CPLError( CE_Warning, CPLE_AppDefined,
"Recode from %s to UTF-8 not supported, treated as ISO8859-1 to UTF-8.",
pszSrcEncoding );
}
utf8froma( pszResult, nCharCount*2+1, pszSource, nCharCount );
return pszResult;
}
/* -------------------------------------------------------------------- */
/* UTF-8 to anything else is treated as UTF-8 to ISO-8859-1 */
/* with a warning. */
/* -------------------------------------------------------------------- */
if( strcmp(pszSrcEncoding,CPL_ENC_UTF8) == 0
&& strcmp(pszDstEncoding,CPL_ENC_ISO8859_1) == 0 )
{
int nCharCount = strlen(pszSource);
char *pszResult = (char *) CPLCalloc(1,nCharCount+1);
if( !bHaveWarned2 )
{
bHaveWarned2 = 1;
CPLError( CE_Warning, CPLE_AppDefined,
"Recode from UTF-8 to %s not supported, treated as UTF-8 to ISO8859-1.",
pszDstEncoding );
}
utf8toa( pszSource, nCharCount, pszResult, nCharCount+1 );
return pszResult;
}
/* -------------------------------------------------------------------- */
/* Everything else is treated as a no-op with a warning. */
/* -------------------------------------------------------------------- */
{
if( !bHaveWarned3 )
{
bHaveWarned3 = 1;
CPLError( CE_Warning, CPLE_AppDefined,
"Recode from %s to %s not supported, no change applied.",
pszSrcEncoding, pszDstEncoding );
}
return CPLStrdup(pszSource);
}
}
/************************************************************************/
/* CPLRecodeFromWCharStub() */
/************************************************************************/
/**
* Convert wchar_t string to UTF-8.
*
* Convert a wchar_t string into a multibyte utf-8 string. The only
* guaranteed supported source encoding is CPL_ENC_UCS2, and the only
* guaranteed supported destination encodings are CPL_ENC_UTF8, CPL_ENC_ASCII
* and CPL_ENC_ISO8859_1. In some cases (ie. using iconv()) other encodings
* may also be supported.
*
* Note that the wchar_t type varies in size on different systems. On
* win32 it is normally 2 bytes, and on unix 4 bytes.
*
* If an error occurs an error may, or may not be posted with CPLError().
*
* @param pwszSource the source wchar_t string, terminated with a 0 wchar_t.
* @param pszSrcEncoding the source encoding, typically CPL_ENC_UCS2.
* @param pszDstEncoding the destination encoding, typically CPL_ENC_UTF8.
*
* @return a zero terminated multi-byte string which should be freed with
* CPLFree(), or NULL if an error occurs.
*/
char *CPLRecodeFromWCharStub( const wchar_t *pwszSource,
const char *pszSrcEncoding,
const char *pszDstEncoding )
{
/* -------------------------------------------------------------------- */
/* We try to avoid changes of character set. We are just */
/* providing for unicode to unicode. */
/* -------------------------------------------------------------------- */
if( strcmp(pszSrcEncoding,"WCHAR_T") != 0 &&
strcmp(pszSrcEncoding,CPL_ENC_UTF8) != 0
&& strcmp(pszSrcEncoding,CPL_ENC_UTF16) != 0
&& strcmp(pszSrcEncoding,CPL_ENC_UCS2) != 0
&& strcmp(pszSrcEncoding,CPL_ENC_UCS4) != 0 )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Stub recoding implementation does not support\n"
"CPLRecodeFromWCharStub(...,%s,%s)",
pszSrcEncoding, pszDstEncoding );
return NULL;
}
/* -------------------------------------------------------------------- */
/* What is the source length. */
/* -------------------------------------------------------------------- */
int nSrcLen = 0;
while( pwszSource[nSrcLen] != 0 )
nSrcLen++;
/* -------------------------------------------------------------------- */
/* Allocate destination buffer plenty big. */
/* -------------------------------------------------------------------- */
char *pszResult;
int nDstBufSize, nDstLen;
nDstBufSize = nSrcLen * 4 + 1;
pszResult = (char *) CPLMalloc(nDstBufSize); // nearly worst case.
if (nSrcLen == 0)
{
pszResult[0] = '\0';
return pszResult;
}
/* -------------------------------------------------------------------- */
/* Convert, and confirm we had enough space. */
/* -------------------------------------------------------------------- */
nDstLen = utf8fromwc( pszResult, nDstBufSize, pwszSource, nSrcLen );
if( nDstLen >= nDstBufSize )
{
CPLAssert( FALSE ); // too small!
return NULL;
}
/* -------------------------------------------------------------------- */
/* If something other than UTF-8 was requested, recode now. */
/* -------------------------------------------------------------------- */
if( strcmp(pszDstEncoding,CPL_ENC_UTF8) == 0 )
return pszResult;
char *pszFinalResult =
CPLRecodeStub( pszResult, CPL_ENC_UTF8, pszDstEncoding );
CPLFree( pszResult );
return pszFinalResult;
}
/************************************************************************/
/* CPLRecodeToWCharStub() */
/************************************************************************/
/**
* Convert UTF-8 string to a wchar_t string.
*
* Convert a 8bit, multi-byte per character input string into a wide
* character (wchar_t) string. The only guaranteed supported source encodings
* are CPL_ENC_UTF8, CPL_ENC_ASCII and CPL_ENC_ISO8869_1 (LATIN1). The only
* guaranteed supported destination encoding is CPL_ENC_UCS2. Other source
* and destination encodings may be supported depending on the underlying
* implementation.
*
* Note that the wchar_t type varies in size on different systems. On
* win32 it is normally 2 bytes, and on unix 4 bytes.
*
* If an error occurs an error may, or may not be posted with CPLError().
*
* @param pszSource input multi-byte character string.
* @param pszSrcEncoding source encoding, typically CPL_ENC_UTF8.
* @param pszDstEncoding destination encoding, typically CPL_ENC_UCS2.
*
* @return the zero terminated wchar_t string (to be freed with CPLFree()) or
* NULL on error.
*
* @since GDAL 1.6.0
*/
wchar_t *CPLRecodeToWCharStub( const char *pszSource,
const char *pszSrcEncoding,
const char *pszDstEncoding )
{
char *pszUTF8Source = (char *) pszSource;
if( strcmp(pszSrcEncoding,CPL_ENC_UTF8) != 0
&& strcmp(pszSrcEncoding,CPL_ENC_ASCII) != 0 )
{
pszUTF8Source = CPLRecodeStub( pszSource, pszSrcEncoding, CPL_ENC_UTF8 );
if( pszUTF8Source == NULL )
return NULL;
}
/* -------------------------------------------------------------------- */
/* We try to avoid changes of character set. We are just */
/* providing for unicode to unicode. */
/* -------------------------------------------------------------------- */
if( strcmp(pszDstEncoding,"WCHAR_T") != 0
&& strcmp(pszDstEncoding,CPL_ENC_UCS2) != 0
&& strcmp(pszDstEncoding,CPL_ENC_UCS4) != 0
&& strcmp(pszDstEncoding,CPL_ENC_UTF16) != 0 )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Stub recoding implementation does not support\n"
"CPLRecodeToWCharStub(...,%s,%s)",
pszSrcEncoding, pszDstEncoding );
return NULL;
}
/* -------------------------------------------------------------------- */
/* Do the UTF-8 to UCS-2 recoding. */
/* -------------------------------------------------------------------- */
int nSrcLen = strlen(pszUTF8Source);
wchar_t *pwszResult = (wchar_t *) CPLCalloc(sizeof(wchar_t),nSrcLen+1);
utf8towc( pszUTF8Source, nSrcLen, pwszResult, nSrcLen+1 );
if( pszUTF8Source != pszSource )
CPLFree( pszUTF8Source );
return pwszResult;
}
/************************************************************************/
/* CPLIsUTF8() */
/************************************************************************/
/**
* Test if a string is encoded as UTF-8.
*
* @param pabyData input string to test
* @param nLen length of the input string, or -1 if the function must compute
* the string length. In which case it must be null terminated.
* @return TRUE if the string is encoded as UTF-8. FALSE otherwise
*
* @since GDAL 1.7.0
*/
int CPLIsUTF8Stub(const char* pabyData, int nLen)
{
if (nLen < 0)
nLen = strlen(pabyData);
return utf8test(pabyData, (unsigned)nLen) != 0;
}
/************************************************************************/
/* ==================================================================== */
/* UTF.C code from FLTK with some modifications. */
/* ==================================================================== */
/************************************************************************/
/* Set to 1 to turn bad UTF8 bytes into ISO-8859-1. If this is to zero
they are instead turned into the Unicode REPLACEMENT CHARACTER, of
value 0xfffd.
If this is on utf8decode will correctly map most (perhaps all)
human-readable text that is in ISO-8859-1. This may allow you
to completely ignore character sets in your code because virtually
everything is either ISO-8859-1 or UTF-8.
*/
#define ERRORS_TO_ISO8859_1 1
/* Set to 1 to turn bad UTF8 bytes in the 0x80-0x9f range into the
Unicode index for Microsoft's CP1252 character set. You should
also set ERRORS_TO_ISO8859_1. With this a huge amount of more
available text (such as all web pages) are correctly converted
to Unicode.
*/
#define ERRORS_TO_CP1252 1
/* A number of Unicode code points are in fact illegal and should not
be produced by a UTF-8 converter. Turn this on will replace the
bytes in those encodings with errors. If you do this then converting
arbitrary 16-bit data to UTF-8 and then back is not an identity,
which will probably break a lot of software.
*/
#define STRICT_RFC3629 0
#if ERRORS_TO_CP1252
// Codes 0x80..0x9f from the Microsoft CP1252 character set, translated
// to Unicode:
static unsigned short cp1252[32] = {
0x20ac, 0x0081, 0x201a, 0x0192, 0x201e, 0x2026, 0x2020, 0x2021,
0x02c6, 0x2030, 0x0160, 0x2039, 0x0152, 0x008d, 0x017d, 0x008f,
0x0090, 0x2018, 0x2019, 0x201c, 0x201d, 0x2022, 0x2013, 0x2014,
0x02dc, 0x2122, 0x0161, 0x203a, 0x0153, 0x009d, 0x017e, 0x0178
};
#endif
/************************************************************************/
/* utf8decode() */
/************************************************************************/
/*
Decode a single UTF-8 encoded character starting at \e p. The
resulting Unicode value (in the range 0-0x10ffff) is returned,
and \e len is set the the number of bytes in the UTF-8 encoding
(adding \e len to \e p will point at the next character).
If \a p points at an illegal UTF-8 encoding, including one that
would go past \e end, or where a code is uses more bytes than
necessary, then *(unsigned char*)p is translated as though it is
in the Microsoft CP1252 character set and \e len is set to 1.
Treating errors this way allows this to decode almost any
ISO-8859-1 or CP1252 text that has been mistakenly placed where
UTF-8 is expected, and has proven very useful.
If you want errors to be converted to error characters (as the
standards recommend), adding a test to see if the length is
unexpectedly 1 will work:
\code
if (*p & 0x80) { // what should be a multibyte encoding
code = utf8decode(p,end,&len);
if (len<2) code = 0xFFFD; // Turn errors into REPLACEMENT CHARACTER
} else { // handle the 1-byte utf8 encoding:
code = *p;
len = 1;
}
\endcode
Direct testing for the 1-byte case (as shown above) will also
speed up the scanning of strings where the majority of characters
are ASCII.
*/
static unsigned utf8decode(const char* p, const char* end, int* len)
{
unsigned char c = *(unsigned char*)p;
if (c < 0x80) {
*len = 1;
return c;
#if ERRORS_TO_CP1252
} else if (c < 0xa0) {
*len = 1;
return cp1252[c-0x80];
#endif
} else if (c < 0xc2) {
goto FAIL;
}
if (p+1 >= end || (p[1]&0xc0) != 0x80) goto FAIL;
if (c < 0xe0) {
*len = 2;
return
((p[0] & 0x1f) << 6) +
((p[1] & 0x3f));
} else if (c == 0xe0) {
if (((unsigned char*)p)[1] < 0xa0) goto FAIL;
goto UTF8_3;
#if STRICT_RFC3629
} else if (c == 0xed) {
// RFC 3629 says surrogate chars are illegal.
if (((unsigned char*)p)[1] >= 0xa0) goto FAIL;
goto UTF8_3;
} else if (c == 0xef) {
// 0xfffe and 0xffff are also illegal characters
if (((unsigned char*)p)[1]==0xbf &&
((unsigned char*)p)[2]>=0xbe) goto FAIL;
goto UTF8_3;
#endif
} else if (c < 0xf0) {
UTF8_3:
if (p+2 >= end || (p[2]&0xc0) != 0x80) goto FAIL;
*len = 3;
return
((p[0] & 0x0f) << 12) +
((p[1] & 0x3f) << 6) +
((p[2] & 0x3f));
} else if (c == 0xf0) {
if (((unsigned char*)p)[1] < 0x90) goto FAIL;
goto UTF8_4;
} else if (c < 0xf4) {
UTF8_4:
if (p+3 >= end || (p[2]&0xc0) != 0x80 || (p[3]&0xc0) != 0x80) goto FAIL;
*len = 4;
#if STRICT_RFC3629
// RFC 3629 says all codes ending in fffe or ffff are illegal:
if ((p[1]&0xf)==0xf &&
((unsigned char*)p)[2] == 0xbf &&
((unsigned char*)p)[3] >= 0xbe) goto FAIL;
#endif
return
((p[0] & 0x07) << 18) +
((p[1] & 0x3f) << 12) +
((p[2] & 0x3f) << 6) +
((p[3] & 0x3f));
} else if (c == 0xf4) {
if (((unsigned char*)p)[1] > 0x8f) goto FAIL; // after 0x10ffff
goto UTF8_4;
} else {
FAIL:
*len = 1;
#if ERRORS_TO_ISO8859_1
return c;
#else
return 0xfffd; // Unicode REPLACEMENT CHARACTER
#endif
}
}
/************************************************************************/
/* utf8fwd() */
/************************************************************************/
/*
Move \a p forward until it points to the start of a UTF-8
character. If it already points at the start of one then it
is returned unchanged. Any UTF-8 errors are treated as though each
byte of the error is an individual character.
\e start is the start of the string and is used to limit the
backwards search for the start of a utf8 character.
\e end is the end of the string and is assummed to be a break
between characters. It is assummed to be greater than p.
This function is for moving a pointer that was jumped to the
middle of a string, such as when doing a binary search for
a position. You should use either this or utf8back() depending
on which direction your algorithim can handle the pointer
moving. Do not use this to scan strings, use utf8decode()
instead.
*/
#ifdef FUTURE_NEEDS
static const char* utf8fwd(const char* p, const char* start, const char* end)
{
const char* a;
int len;
// if we are not pointing at a continuation character, we are done:
if ((*p&0xc0) != 0x80) return p;
// search backwards for a 0xc0 starting the character:
for (a = p-1; ; --a) {
if (a < start) return p;
if (!(a[0]&0x80)) return p;
if ((a[0]&0x40)) break;
}
utf8decode(a,end,&len);
a += len;
if (a > p) return a;
return p;
}
#endif /* def FUTURE_NEEDS */
/************************************************************************/
/* utf8back() */
/************************************************************************/
/*
Move \a p backward until it points to the start of a UTF-8
character. If it already points at the start of one then it
is returned unchanged. Any UTF-8 errors are treated as though each
byte of the error is an individual character.
\e start is the start of the string and is used to limit the
backwards search for the start of a UTF-8 character.
\e end is the end of the string and is assummed to be a break
between characters. It is assummed to be greater than p.
If you wish to decrement a UTF-8 pointer, pass p-1 to this.
*/
#ifdef FUTURE_NEEDS
static const char* utf8back(const char* p, const char* start, const char* end)
{
const char* a;
int len;
// if we are not pointing at a continuation character, we are done:
if ((*p&0xc0) != 0x80) return p;
// search backwards for a 0xc0 starting the character:
for (a = p-1; ; --a) {
if (a < start) return p;
if (!(a[0]&0x80)) return p;
if ((a[0]&0x40)) break;
}
utf8decode(a,end,&len);
if (a+len > p) return a;
return p;
}
#endif /* def FUTURE_NEEDS */
/************************************************************************/
/* utf8bytes() */
/************************************************************************/
/* Returns number of bytes that utf8encode() will use to encode the
character \a ucs. */
#ifdef FUTURE_NEEDS
static int utf8bytes(unsigned ucs) {
if (ucs < 0x000080U) {
return 1;
} else if (ucs < 0x000800U) {
return 2;
} else if (ucs < 0x010000U) {
return 3;
} else if (ucs < 0x10ffffU) {
return 4;
} else {
return 3; // length of the illegal character encoding
}
}
#endif /* def FUTURE_NEEDS */
/************************************************************************/
/* utf8encode() */
/************************************************************************/
/* Write the UTF-8 encoding of \e ucs into \e buf and return the
number of bytes written. Up to 4 bytes may be written. If you know
that \a ucs is less than 0x10000 then at most 3 bytes will be written.
If you wish to speed this up, remember that anything less than 0x80
is written as a single byte.
If ucs is greater than 0x10ffff this is an illegal character
according to RFC 3629. These are converted as though they are
0xFFFD (REPLACEMENT CHARACTER).
RFC 3629 also says many other values for \a ucs are illegal (in
the range 0xd800 to 0xdfff, or ending with 0xfffe or
0xffff). However I encode these as though they are legal, so that
utf8encode/utf8decode will be the identity for all codes between 0
and 0x10ffff.
*/
#ifdef FUTURE_NEEDS
static int utf8encode(unsigned ucs, char* buf) {
if (ucs < 0x000080U) {
buf[0] = ucs;
return 1;
} else if (ucs < 0x000800U) {
buf[0] = 0xc0 | (ucs >> 6);
buf[1] = 0x80 | (ucs & 0x3F);
return 2;
} else if (ucs < 0x010000U) {
buf[0] = 0xe0 | (ucs >> 12);
buf[1] = 0x80 | ((ucs >> 6) & 0x3F);
buf[2] = 0x80 | (ucs & 0x3F);
return 3;
} else if (ucs < 0x0010ffffU) {
buf[0] = 0xf0 | (ucs >> 18);
buf[1] = 0x80 | ((ucs >> 12) & 0x3F);
buf[2] = 0x80 | ((ucs >> 6) & 0x3F);
buf[3] = 0x80 | (ucs & 0x3F);
return 4;
} else {
// encode 0xfffd:
buf[0] = 0xefU;
buf[1] = 0xbfU;
buf[2] = 0xbdU;
return 3;
}
}
#endif /* def FUTURE_NEEDS */
/************************************************************************/
/* utf8towc() */
/************************************************************************/
/* Convert a UTF-8 sequence into an array of wchar_t. These
are used by some system calls, especially on Windows.
\a src points at the UTF-8, and \a srclen is the number of bytes to
convert.
\a dst points at an array to write, and \a dstlen is the number of
locations in this array. At most \a dstlen-1 words will be
written there, plus a 0 terminating word. Thus this function
will never overwrite the buffer and will always return a
zero-terminated string. If \a dstlen is zero then \a dst can be
null and no data is written, but the length is returned.
The return value is the number of words that \e would be written
to \a dst if it were long enough, not counting the terminating
zero. If the return value is greater or equal to \a dstlen it
indicates truncation, you can then allocate a new array of size
return+1 and call this again.
Errors in the UTF-8 are converted as though each byte in the
erroneous string is in the Microsoft CP1252 encoding. This allows
ISO-8859-1 text mistakenly identified as UTF-8 to be printed
correctly.
Notice that sizeof(wchar_t) is 2 on Windows and is 4 on Linux
and most other systems. Where wchar_t is 16 bits, Unicode
characters in the range 0x10000 to 0x10ffff are converted to
"surrogate pairs" which take two words each (this is called UTF-16
encoding). If wchar_t is 32 bits this rather nasty problem is
avoided.
*/
static unsigned utf8towc(const char* src, unsigned srclen,
wchar_t* dst, unsigned dstlen)
{
const char* p = src;
const char* e = src+srclen;
unsigned count = 0;
if (dstlen) for (;;) {
if (p >= e) {dst[count] = 0; return count;}
if (!(*p & 0x80)) { // ascii
dst[count] = *p++;
} else {
int len; unsigned ucs = utf8decode(p,e,&len);
p += len;
#ifdef _WIN32
if (ucs < 0x10000) {
dst[count] = (wchar_t)ucs;
} else {
// make a surrogate pair:
if (count+2 >= dstlen) {dst[count] = 0; count += 2; break;}
dst[count] = (wchar_t)((((ucs-0x10000u)>>10)&0x3ff) | 0xd800);
dst[++count] = (wchar_t)((ucs&0x3ff) | 0xdc00);
}
#else
dst[count] = (wchar_t)ucs;
#endif
}
if (++count == dstlen) {dst[count-1] = 0; break;}
}
// we filled dst, measure the rest:
while (p < e) {
if (!(*p & 0x80)) p++;
else {
#ifdef _WIN32
int len; unsigned ucs = utf8decode(p,e,&len);
p += len;
if (ucs >= 0x10000) ++count;
#else
int len; utf8decode(p,e,&len);
p += len;
#endif
}
++count;
}
return count;
}
/************************************************************************/
/* utf8toa() */
/************************************************************************/
/* Convert a UTF-8 sequence into an array of 1-byte characters.
If the UTF-8 decodes to a character greater than 0xff then it is
replaced with '?'.
Errors in the UTF-8 are converted as individual bytes, same as
utf8decode() does. This allows ISO-8859-1 text mistakenly identified
as UTF-8 to be printed correctly (and possibly CP1512 on Windows).
\a src points at the UTF-8, and \a srclen is the number of bytes to
convert.
Up to \a dstlen bytes are written to \a dst, including a null
terminator. The return value is the number of bytes that would be
written, not counting the null terminator. If greater or equal to
\a dstlen then if you malloc a new array of size n+1 you will have
the space needed for the entire string. If \a dstlen is zero then
nothing is written and this call just measures the storage space
needed.
*/
static unsigned utf8toa(const char* src, unsigned srclen,
char* dst, unsigned dstlen)
{
const char* p = src;
const char* e = src+srclen;
unsigned count = 0;
if (dstlen) for (;;) {
unsigned char c;
if (p >= e) {dst[count] = 0; return count;}
c = *(unsigned char*)p;
if (c < 0xC2) { // ascii or bad code
dst[count] = c;
p++;
} else {
int len; unsigned ucs = utf8decode(p,e,&len);
p += len;
if (ucs < 0x100) dst[count] = (char)ucs;
else
{
if (!bHaveWarned4)
{
bHaveWarned4 = TRUE;
CPLError(CE_Warning, CPLE_AppDefined,
"One or several characters couldn't be converted correctly from UTF-8 to ISO-8859-1.\n"
"This warning will not be emitted anymore.");
}
dst[count] = '?';
}
}
if (++count >= dstlen) {dst[count-1] = 0; break;}
}
// we filled dst, measure the rest:
while (p < e) {
if (!(*p & 0x80)) p++;
else {
int len;
utf8decode(p,e,&len);
p += len;
}
++count;
}
return count;
}
/************************************************************************/
/* utf8fromwc() */
/************************************************************************/
/* Turn "wide characters" as returned by some system calls
(especially on Windows) into UTF-8.
Up to \a dstlen bytes are written to \a dst, including a null
terminator. The return value is the number of bytes that would be
written, not counting the null terminator. If greater or equal to
\a dstlen then if you malloc a new array of size n+1 you will have
the space needed for the entire string. If \a dstlen is zero then
nothing is written and this call just measures the storage space
needed.
\a srclen is the number of words in \a src to convert. On Windows
this is not necessairly the number of characters, due to there
possibly being "surrogate pairs" in the UTF-16 encoding used.
On Unix wchar_t is 32 bits and each location is a character.
On Unix if a src word is greater than 0x10ffff then this is an
illegal character according to RFC 3629. These are converted as
though they are 0xFFFD (REPLACEMENT CHARACTER). Characters in the
range 0xd800 to 0xdfff, or ending with 0xfffe or 0xffff are also
illegal according to RFC 3629. However I encode these as though
they are legal, so that utf8towc will return the original data.
On Windows "surrogate pairs" are converted to a single character
and UTF-8 encoded (as 4 bytes). Mismatched halves of surrogate
pairs are converted as though they are individual characters.
*/
static unsigned utf8fromwc(char* dst, unsigned dstlen,
const wchar_t* src, unsigned srclen) {
unsigned i = 0;
unsigned count = 0;
if (dstlen) for (;;) {
unsigned ucs;
if (i >= srclen) {dst[count] = 0; return count;}
ucs = src[i++];
if (ucs < 0x80U) {
dst[count++] = (char)ucs;
if (count >= dstlen) {dst[count-1] = 0; break;}
} else if (ucs < 0x800U) { // 2 bytes
if (count+2 >= dstlen) {dst[count] = 0; count += 2; break;}
dst[count++] = 0xc0 | (char)(ucs >> 6);
dst[count++] = 0x80 | (char)(ucs & 0x3F);
#ifdef _WIN32
} else if (ucs >= 0xd800 && ucs <= 0xdbff && i < srclen &&
src[i] >= 0xdc00 && src[i] <= 0xdfff) {
// surrogate pair
unsigned ucs2 = src[i++];
ucs = 0x10000U + ((ucs&0x3ff)<<10) + (ucs2&0x3ff);
// all surrogate pairs turn into 4-byte utf8
#else
} else if (ucs >= 0x10000) {
if (ucs > 0x10ffff) {
ucs = 0xfffd;
goto J1;
}
#endif
if (count+4 >= dstlen) {dst[count] = 0; count += 4; break;}
dst[count++] = 0xf0 | (char)(ucs >> 18);
dst[count++] = 0x80 | (char)((ucs >> 12) & 0x3F);
dst[count++] = 0x80 | (char)((ucs >> 6) & 0x3F);
dst[count++] = 0x80 | (char)(ucs & 0x3F);
} else {
#ifndef _WIN32
J1:
#endif
// all others are 3 bytes:
if (count+3 >= dstlen) {dst[count] = 0; count += 3; break;}
dst[count++] = 0xe0 | (char)(ucs >> 12);
dst[count++] = 0x80 | (char)((ucs >> 6) & 0x3F);
dst[count++] = 0x80 | (char)(ucs & 0x3F);
}
}
// we filled dst, measure the rest:
while (i < srclen) {
unsigned ucs = src[i++];
if (ucs < 0x80U) {
count++;
} else if (ucs < 0x800U) { // 2 bytes
count += 2;
#ifdef _WIN32
} else if (ucs >= 0xd800 && ucs <= 0xdbff && i < srclen-1 &&
src[i+1] >= 0xdc00 && src[i+1] <= 0xdfff) {
// surrogate pair
++i;
#else
} else if (ucs >= 0x10000 && ucs <= 0x10ffff) {
#endif
count += 4;
} else {
count += 3;
}
}
return count;
}
/************************************************************************/
/* utf8froma() */
/************************************************************************/
/* Convert an ISO-8859-1 (ie normal c-string) byte stream to UTF-8.
It is possible this should convert Microsoft's CP1252 to UTF-8
instead. This would translate the codes in the range 0x80-0x9f
to different characters. Currently it does not do this.
Up to \a dstlen bytes are written to \a dst, including a null
terminator. The return value is the number of bytes that would be
written, not counting the null terminator. If greater or equal to
\a dstlen then if you malloc a new array of size n+1 you will have
the space needed for the entire string. If \a dstlen is zero then
nothing is written and this call just measures the storage space
needed.
\a srclen is the number of bytes in \a src to convert.
If the return value equals \a srclen then this indicates that
no conversion is necessary, as only ASCII characters are in the
string.
*/
static unsigned utf8froma(char* dst, unsigned dstlen,
const char* src, unsigned srclen) {
const char* p = src;
const char* e = src+srclen;
unsigned count = 0;
if (dstlen) for (;;) {
unsigned char ucs;
if (p >= e) {dst[count] = 0; return count;}
ucs = *(unsigned char*)p++;
if (ucs < 0x80U) {
dst[count++] = ucs;
if (count >= dstlen) {dst[count-1] = 0; break;}
} else { // 2 bytes (note that CP1252 translate could make 3 bytes!)
if (count+2 >= dstlen) {dst[count] = 0; count += 2; break;}
dst[count++] = 0xc0 | (ucs >> 6);
dst[count++] = 0x80 | (ucs & 0x3F);
}
}
// we filled dst, measure the rest:
while (p < e) {
unsigned char ucs = *(unsigned char*)p++;
if (ucs < 0x80U) {
count++;
} else {
count += 2;
}
}
return count;
}
#ifdef _WIN32
/************************************************************************/
/* CPLWin32Recode() */
/************************************************************************/
/* Convert an CODEPAGE (ie normal c-string) byte stream
to another CODEPAGE (ie normal c-string) byte stream.
\a src is target c-string byte stream (including a null terminator).
\a src_code_page is target c-string byte code page.
\a dst_code_page is destination c-string byte code page.
UTF7 65000
UTF8 65001
OEM-US 437
OEM-ALABIC 720
OEM-GREEK 737
OEM-BALTIC 775
OEM-MLATIN1 850
OEM-LATIN2 852
OEM-CYRILLIC 855
OEM-TURKISH 857
OEM-MLATIN1P 858
OEM-HEBREW 862
OEM-RUSSIAN 866
THAI 874
SJIS 932
GBK 936
KOREA 949
BIG5 950
EUROPE 1250
CYRILLIC 1251
LATIN1 1252
GREEK 1253
TURKISH 1254
HEBREW 1255
ARABIC 1256
BALTIC 1257
VIETNAM 1258
ISO-LATIN1 28591
ISO-LATIN2 28592
ISO-LATIN3 28593
ISO-BALTIC 28594
ISO-CYRILLIC 28595
ISO-ARABIC 28596
ISO-HEBREW 28598
ISO-TURKISH 28599
ISO-LATIN9 28605
ISO-2022-JP 50220
*/
char* CPLWin32Recode( const char* src, unsigned src_code_page, unsigned dst_code_page )
{
/* Convert from source code page to Unicode */
/* Compute the length in wide characters */
int wlen = MultiByteToWideChar( src_code_page, MB_ERR_INVALID_CHARS, src, -1, 0, 0 );
if (wlen == 0 && GetLastError() == ERROR_NO_UNICODE_TRANSLATION)
{
if (!bHaveWarned5)
{
bHaveWarned5 = TRUE;
CPLError(CE_Warning, CPLE_AppDefined,
"One or several characters could not be translated from CP%d. "
"This warning will not be emitted anymore.", src_code_page);
}
/* Retry now without MB_ERR_INVALID_CHARS flag */
wlen = MultiByteToWideChar( src_code_page, 0, src, -1, 0, 0 );
}
/* Do the actual conversion */
wchar_t* tbuf = (wchar_t*)CPLCalloc(sizeof(wchar_t),wlen+1);
tbuf[wlen] = 0;
MultiByteToWideChar( src_code_page, 0, src, -1, tbuf, wlen+1 );
/* Convert from Unicode to destination code page */
/* Compute the length in chars */
BOOL bUsedDefaultChar = FALSE;
int len;
if ( dst_code_page == CP_UTF7 || dst_code_page == CP_UTF8 )
len = WideCharToMultiByte( dst_code_page, 0, tbuf, -1, 0, 0, 0, NULL );
else
len = WideCharToMultiByte( dst_code_page, 0, tbuf, -1, 0, 0, 0, &bUsedDefaultChar );
if (bUsedDefaultChar)
{
if (!bHaveWarned6)
{
bHaveWarned6 = TRUE;
CPLError(CE_Warning, CPLE_AppDefined,
"One or several characters could not be translated to CP%d. "
"This warning will not be emitted anymore.", dst_code_page);
}
}
/* Do the actual conversion */
char* pszResult = (char*)CPLCalloc(sizeof(char),len+1);
WideCharToMultiByte( dst_code_page, 0, tbuf, -1, pszResult, len+1, 0, NULL );
pszResult[len] = 0;
/* Cleanup */
CPLFree(tbuf);
return pszResult;
}
#endif
/*
** For now we disable the rest which is locale() related. We may need
** parts of it later.
*/
#ifdef notdef
#ifdef _WIN32
# include <windows.h>
#endif
/*! Return true if the "locale" seems to indicate that UTF-8 encoding
is used. If true the utf8tomb and utf8frommb don't do anything
useful.
<i>It is highly recommended that you change your system so this
does return true.</i> On Windows this is done by setting the
"codepage" to CP_UTF8. On Unix this is done by setting $LC_CTYPE
to a string containing the letters "utf" or "UTF" in it, or by
deleting all $LC* and $LANG environment variables. In the future
it is likely that all non-Asian Unix systems will return true,
due to the compatability of UTF-8 with ISO-8859-1.
*/
int utf8locale(void) {
static int ret = 2;
if (ret == 2) {
#ifdef _WIN32
ret = GetACP() == CP_UTF8;
#else
char* s;
ret = 1; // assumme UTF-8 if no locale
if (((s = getenv("LC_CTYPE")) && *s) ||
((s = getenv("LC_ALL")) && *s) ||
((s = getenv("LANG")) && *s)) {
ret = (strstr(s,"utf") || strstr(s,"UTF"));
}
#endif
}
return ret;
}
/*! Convert the UTF-8 used by FLTK to the locale-specific encoding
used for filenames (and sometimes used for data in files).
Unfortunatley due to stupid design you will have to do this as
needed for filenames. This is a bug on both Unix and Windows.
Up to \a dstlen bytes are written to \a dst, including a null
terminator. The return value is the number of bytes that would be
written, not counting the null terminator. If greater or equal to
\a dstlen then if you malloc a new array of size n+1 you will have
the space needed for the entire string. If \a dstlen is zero then
nothing is written and this call just measures the storage space
needed.
If utf8locale() returns true then this does not change the data.
It is copied and truncated as necessary to
the destination buffer and \a srclen is always returned. */
unsigned utf8tomb(const char* src, unsigned srclen,
char* dst, unsigned dstlen)
{
if (!utf8locale()) {
#ifdef _WIN32
wchar_t lbuf[1024];
wchar_t* buf = lbuf;
unsigned length = utf8towc(src, srclen, buf, 1024);
unsigned ret;
if (length >= 1024) {
buf = (wchar_t*)(malloc((length+1)*sizeof(wchar_t)));
utf8towc(src, srclen, buf, length+1);
}
if (dstlen) {
// apparently this does not null-terminate, even though msdn
// documentation claims it does:
ret =
WideCharToMultiByte(GetACP(), 0, buf, length, dst, dstlen, 0, 0);
dst[ret] = 0;
}
// if it overflows or measuring length, get the actual length:
if (dstlen==0 || ret >= dstlen-1)
ret =
WideCharToMultiByte(GetACP(), 0, buf, length, 0, 0, 0, 0);
if (buf != lbuf) free((void*)buf);
return ret;
#else
wchar_t lbuf[1024];
wchar_t* buf = lbuf;
unsigned length = utf8towc(src, srclen, buf, 1024);
int ret;
if (length >= 1024) {
buf = (wchar_t*)(malloc((length+1)*sizeof(wchar_t)));
utf8towc(src, srclen, buf, length+1);
}
if (dstlen) {
ret = wcstombs(dst, buf, dstlen);
if (ret >= dstlen-1) ret = wcstombs(0,buf,0);
} else {
ret = wcstombs(0,buf,0);
}
if (buf != lbuf) free((void*)buf);
if (ret >= 0) return (unsigned)ret;
// on any errors we return the UTF-8 as raw text...
#endif
}
// identity transform:
if (srclen < dstlen) {
memcpy(dst, src, srclen);
dst[srclen] = 0;
} else {
memcpy(dst, src, dstlen-1);
dst[dstlen-1] = 0;
}
return srclen;
}
/*! Convert a filename from the locale-specific multibyte encoding
used by Windows to UTF-8 as used by FLTK.
Up to \a dstlen bytes are written to \a dst, including a null
terminator. The return value is the number of bytes that would be
written, not counting the null terminator. If greater or equal to
\a dstlen then if you malloc a new array of size n+1 you will have
the space needed for the entire string. If \a dstlen is zero then
nothing is written and this call just measures the storage space
needed.
On Unix or on Windows when a UTF-8 locale is in effect, this
does not change the data. It is copied and truncated as necessary to
the destination buffer and \a srclen is always returned.
You may also want to check if utf8test() returns non-zero, so that
the filesystem can store filenames in UTF-8 encoding regardless of
the locale.
*/
unsigned utf8frommb(char* dst, unsigned dstlen,
const char* src, unsigned srclen)
{
if (!utf8locale()) {
#ifdef _WIN32
wchar_t lbuf[1024];
wchar_t* buf = lbuf;
unsigned length;
unsigned ret;
length =
MultiByteToWideChar(GetACP(), 0, src, srclen, buf, 1024);
if (length >= 1024) {
length = MultiByteToWideChar(GetACP(), 0, src, srclen, 0, 0);
buf = (wchar_t*)(malloc(length*sizeof(wchar_t)));
MultiByteToWideChar(GetACP(), 0, src, srclen, buf, length);
}
ret = utf8fromwc(dst, dstlen, buf, length);
if (buf != lbuf) free((void*)buf);
return ret;
#else
wchar_t lbuf[1024];
wchar_t* buf = lbuf;
int length;
unsigned ret;
length = mbstowcs(buf, src, 1024);
if (length >= 1024) {
length = mbstowcs(0, src, 0)+1;
buf = (wchar_t*)(malloc(length*sizeof(unsigned short)));
mbstowcs(buf, src, length);
}
if (length >= 0) {
ret = utf8fromwc(dst, dstlen, buf, length);
if (buf != lbuf) free((void*)buf);
return ret;
}
// errors in conversion return the UTF-8 unchanged
#endif
}
// identity transform:
if (srclen < dstlen) {
memcpy(dst, src, srclen);
dst[srclen] = 0;
} else {
memcpy(dst, src, dstlen-1);
dst[dstlen-1] = 0;
}
return srclen;
}
#endif /* def notdef - disabled locale specific stuff */
/*! Examines the first \a srclen bytes in \a src and return a verdict
on whether it is UTF-8 or not.
- Returns 0 if there is any illegal UTF-8 sequences, using the
same rules as utf8decode(). Note that some UCS values considered
illegal by RFC 3629, such as 0xffff, are considered legal by this.
- Returns 1 if there are only single-byte characters (ie no bytes
have the high bit set). This is legal UTF-8, but also indicates
plain ASCII. It also returns 1 if \a srclen is zero.
- Returns 2 if there are only characters less than 0x800.
- Returns 3 if there are only characters less than 0x10000.
- Returns 4 if there are characters in the 0x10000 to 0x10ffff range.
Because there are many illegal sequences in UTF-8, it is almost
impossible for a string in another encoding to be confused with
UTF-8. This is very useful for transitioning Unix to UTF-8
filenames, you can simply test each filename with this to decide
if it is UTF-8 or in the locale encoding. My hope is that if
this is done we will be able to cleanly transition to a locale-less
encoding.
*/
static int utf8test(const char* src, unsigned srclen) {
int ret = 1;
const char* p = src;
const char* e = src+srclen;
while (p < e) {
if (*p & 0x80) {
int len; utf8decode(p,e,&len);
if (len < 2) return 0;
if (len > ret) ret = len;
p += len;
} else {
p++;
}
}
return ret;
}
#endif /* defined(CPL_RECODE_STUB) */
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