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office-gobmx/sal/textenc/tcvtutf7.c
Jens-Heiner Rechtien cbb45b7e6d INTEGRATION: CWS warnings01 (1.5.12); FILE MERGED 
2005/11/07 12:11:30 sb 1.5.12.1: #i53898# Made code warning-free (additional -W switches for GCC).
2006-06-20 03:38:15 +00:00

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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: tcvtutf7.c,v $
*
* $Revision: 1.6 $
*
* last change: $Author: hr $ $Date: 2006-06-20 04:38:15 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library 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 GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
#ifndef INCLUDED_RTL_TEXTENC_TENCHELP_H
#include "tenchelp.h"
#endif
#ifndef INCLUDED_RTL_TEXTENC_UNICHARS_H
#include "unichars.h"
#endif
#ifndef _RTL_ALLOC_H
#include "rtl/alloc.h"
#endif
#ifndef _RTL_TEXTCVT_H
#include "rtl/textcvt.h"
#endif
/* ======================================================================= */
static sal_uChar const aImplBase64Tab[64] =
{
/* A-Z */
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,
/* a-z */
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,
/* 0-9,+,/ */
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
0x38, 0x39, 0x2B, 0x2F
};
/* Index in Base64Tab or 0xFF, when is a invalid character */
static sal_uChar const aImplBase64IndexTab[128] =
{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 0x00-0x07 */
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 0x08-0x0F */
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 0x10-0x17 */
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 0x18-0x1F */
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 0x20-0x27 !"#$%&' */
0xFF, 0xFF, 0xFF, 62, 0xFF, 0xFF, 0xFF, 63, /* 0x28-0x2F ()*+,-./ */
52, 53, 54, 55, 56, 57, 58, 59, /* 0x30-0x37 01234567 */
60, 61, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 0x38-0x3F 89:;<=>? */
0xFF, 0, 1, 2, 3, 4, 5, 6, /* 0x40-0x47 @ABCDEFG */
7, 8, 9, 10, 11, 12, 13, 14, /* 0x48-0x4F HIJKLMNO */
15, 16, 17, 18, 19, 20, 21, 22, /* 0x50-0x57 PQRSTUVW */
23, 24, 25, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 0x58-0x5F XYZ[\]^_ */
0xFF, 26, 27, 28, 29, 30, 31, 32, /* 0x60-0x67 `abcdefg */
33, 34, 35, 36, 37, 38, 39, 40, /* 0x68-0x6F hijklmno */
41, 42, 43, 44, 45, 46, 47, 48, /* 0x70-0x77 pqrstuvw */
49, 50, 51, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF /* 0x78-0x7F xyz{|}~ */
};
static sal_uChar const aImplMustShiftTab[128] =
{
1, 1, 1, 1, 1, 1, 1, 1, /* 0x00-0x07 */
1, 0, 0, 1, 0, 1, 1, 1, /* 0x08-0x0F 0x09 == HTAB, 0x0A == LF 0x0C == CR */
1, 1, 1, 1, 1, 1, 1, 1, /* 0x10-0x17 */
1, 1, 1, 1, 1, 1, 1, 1, /* 0x18-0x1F */
0, 1, 1, 1, 1, 1, 1, 0, /* 0x20-0x27 !"#$%&' */
0, 0, 1, 1, 0, 1, 0, 0, /* 0x28-0x2F ()*+,-./ */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x30-0x37 01234567 */
0, 0, 0, 1, 1, 1, 1, 0, /* 0x38-0x3F 89:;<=>? */
1, 0, 0, 0, 0, 0, 0, 0, /* 0x40-0x47 @ABCDEFG */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x48-0x4F HIJKLMNO */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x50-0x57 PQRSTUVW */
0, 0, 0, 1, 1, 1, 1, 1, /* 0x58-0x5F XYZ[\]^_ */
1, 0, 0, 0, 0, 0, 0, 0, /* 0x60-0x67 `abcdefg */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x68-0x6F hijklmno */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x70-0x77 pqrstuvw */
0, 0, 0, 1, 1, 1, 1, 1 /* 0x78-0x7F xyz{|}~ */
};
/* + */
#define IMPL_SHIFT_IN_CHAR 0x2B
/* - */
#define IMPL_SHIFT_OUT_CHAR 0x2D
/* ----------------------------------------------------------------------- */
typedef struct
{
int mbShifted;
int mbFirst;
int mbWroteOne;
sal_uInt32 mnBitBuffer;
sal_uInt32 mnBufferBits;
} ImplUTF7ToUCContextData;
/* ----------------------------------------------------------------------- */
void* ImplUTF7CreateUTF7TextToUnicodeContext( void )
{
ImplUTF7ToUCContextData* pContextData;
pContextData = (ImplUTF7ToUCContextData*)rtl_allocateMemory( sizeof( ImplUTF7ToUCContextData ) );
pContextData->mbShifted = sal_False;
pContextData->mbFirst = sal_False;
pContextData->mbWroteOne = sal_False;
pContextData->mnBitBuffer = 0;
pContextData->mnBufferBits = 0;
return (void*)pContextData;
}
/* ----------------------------------------------------------------------- */
void ImplUTF7DestroyTextToUnicodeContext( void* pContext )
{
rtl_freeMemory( pContext );
}
/* ----------------------------------------------------------------------- */
void ImplUTF7ResetTextToUnicodeContext( void* pContext )
{
ImplUTF7ToUCContextData* pContextData = (ImplUTF7ToUCContextData*)pContext;
pContextData->mbShifted = sal_False;
pContextData->mbFirst = sal_False;
pContextData->mbWroteOne = sal_False;
pContextData->mnBitBuffer = 0;
pContextData->mnBufferBits = 0;
}
/* ----------------------------------------------------------------------- */
sal_Size ImplUTF7ToUnicode( const ImplTextConverterData* pData, void* pContext,
const sal_Char* pSrcBuf, sal_Size nSrcBytes,
sal_Unicode* pDestBuf, sal_Size nDestChars,
sal_uInt32 nFlags, sal_uInt32* pInfo,
sal_Size* pSrcCvtBytes )
{
ImplUTF7ToUCContextData* pContextData = (ImplUTF7ToUCContextData*)pContext;
sal_uChar c ='\0';
sal_uChar nBase64Value = 0;
int bEnd = sal_False;
int bShifted;
int bFirst;
int bWroteOne;
int bBase64End;
sal_uInt32 nBitBuffer;
sal_uInt32 nBitBufferTemp;
sal_uInt32 nBufferBits;
sal_Unicode* pEndDestBuf;
const sal_Char* pEndSrcBuf;
(void) pData; /* unused */
/* !!! Implementation not finnished !!!
if ( pContextData )
{
bShifted = pContextData->mbShifted;
bFirst = pContextData->mbFirst;
bWroteOne = pContextData->mbWroteOne;
nBitBuffer = pContextData->mnBitBuffer;
nBufferBits = pContextData->mnBufferBits;
}
else
*/
{
bShifted = sal_False;
bFirst = sal_False;
bWroteOne = sal_False;
nBitBuffer = 0;
nBufferBits = 0;
}
*pInfo = 0;
pEndDestBuf = pDestBuf+nDestChars;
pEndSrcBuf = pSrcBuf+nSrcBytes;
do
{
if ( pSrcBuf < pEndSrcBuf )
{
c = (sal_uChar)*pSrcBuf;
/* End, when not a base64 character */
bBase64End = sal_False;
if ( c <= 0x7F )
{
nBase64Value = aImplBase64IndexTab[c];
if ( nBase64Value == 0xFF )
bBase64End = sal_True;
}
}
else
{
bEnd = sal_True;
bBase64End = sal_True;
}
if ( bShifted )
{
if ( bBase64End )
{
bShifted = sal_False;
/* If the character causing us to drop out was SHIFT_IN */
/* or SHIFT_OUT, it may be a special escape for SHIFT_IN. */
/* The test for SHIFT_IN is not necessary, but allows */
/* an alternate form of UTF-7 where SHIFT_IN is escaped */
/* by SHIFT_IN. This only works for some values of */
/* SHIFT_IN. It is so implemented, because this comes */
/* from the officel unicode book (The Unicode Standard, */
/* Version 2.0) and so I think, that someone of the */
/* world has used this feature. */
if ( !bEnd )
{
if ( (c == IMPL_SHIFT_IN_CHAR) || (c == IMPL_SHIFT_OUT_CHAR) )
{
/* If no base64 character, and the terminating */
/* character of the shift sequence was the */
/* SHIFT_OUT_CHAR, then it't a special escape */
/* for SHIFT_IN_CHAR. */
if ( bFirst && (c == IMPL_SHIFT_OUT_CHAR) )
{
if ( pDestBuf >= pEndDestBuf )
{
*pInfo |= RTL_TEXTTOUNICODE_INFO_ERROR | RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOSMALL;
break;
}
*pDestBuf = IMPL_SHIFT_IN_CHAR;
pDestBuf++;
bWroteOne = sal_True;
}
/* Skip character */
pSrcBuf++;
if ( pSrcBuf < pEndSrcBuf )
c = (sal_uChar)*pSrcBuf;
else
bEnd = sal_True;
}
}
/* Empty sequence not allowed, so when we don't write one */
/* valid char, then the sequence is corrupt */
if ( !bWroteOne )
{
/* When no more bytes in the source buffer, then */
/* this buffer may be to small */
if ( bEnd )
*pInfo |= RTL_TEXTTOUNICODE_INFO_ERROR | RTL_TEXTTOUNICODE_INFO_SRCBUFFERTOSMALL;
else
{
*pInfo |= RTL_TEXTTOUNICODE_INFO_INVALID;
if ( (nFlags & RTL_TEXTTOUNICODE_FLAGS_INVALID_MASK) == RTL_TEXTTOUNICODE_FLAGS_INVALID_ERROR )
{
*pInfo |= RTL_TEXTTOUNICODE_INFO_ERROR;
break;
}
/* We insert here no default char, because I think */
/* this is better to ignore this */
}
}
}
else
{
/* Add 6 Bits from character to the bit buffer */
nBufferBits += 6;
nBitBuffer |= ((sal_uInt32)(nBase64Value & 0x3F)) << (32-nBufferBits);
bFirst = sal_False;
}
/* Extract as many full 16 bit characters as possible from the */
/* bit buffer. */
while ( (pDestBuf < pEndDestBuf) && (nBufferBits >= 16) )
{
nBitBufferTemp = nBitBuffer >> (32-16);
*pDestBuf = (sal_Unicode)((nBitBufferTemp) & 0xFFFF);
pDestBuf++;
nBitBuffer <<= 16;
nBufferBits -= 16;
bWroteOne = sal_True;
}
if ( nBufferBits >= 16 )
{
*pInfo |= RTL_TEXTTOUNICODE_INFO_ERROR | RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOSMALL;
break;
}
if ( bBase64End )
{
/* Sequence ended and we have some bits, then the */
/* sequence is corrupted */
if ( nBufferBits && nBitBuffer )
{
/* When no more bytes in the source buffer, then */
/* this buffer may be to small */
if ( bEnd )
*pInfo |= RTL_TEXTTOUNICODE_INFO_ERROR | RTL_TEXTTOUNICODE_INFO_SRCBUFFERTOSMALL;
else
{
*pInfo |= RTL_TEXTTOUNICODE_INFO_INVALID;
if ( (nFlags & RTL_TEXTTOUNICODE_FLAGS_INVALID_MASK) == RTL_TEXTTOUNICODE_FLAGS_INVALID_ERROR )
{
*pInfo |= RTL_TEXTTOUNICODE_INFO_ERROR;
break;
}
else if ( (nFlags & RTL_TEXTTOUNICODE_FLAGS_INVALID_MASK) != RTL_TEXTTOUNICODE_FLAGS_INVALID_IGNORE )
{
if ( pDestBuf >= pEndDestBuf )
{
*pInfo |= RTL_TEXTTOUNICODE_INFO_ERROR | RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOSMALL;
break;
}
*pDestBuf++
= RTL_TEXTENC_UNICODE_REPLACEMENT_CHARACTER;
}
}
}
nBitBuffer = 0;
nBufferBits = 0;
}
}
if ( !bEnd )
{
if ( !bShifted )
{
if ( c == IMPL_SHIFT_IN_CHAR )
{
bShifted = sal_True;
bFirst = sal_True;
bWroteOne = sal_False;
}
else
{
/* No direct encoded charcater, then the buffer is */
/* corrupt */
if ( c > 0x7F )
{
*pInfo |= RTL_TEXTTOUNICODE_INFO_INVALID;
if ( (nFlags & RTL_TEXTTOUNICODE_FLAGS_INVALID_MASK) == RTL_TEXTTOUNICODE_FLAGS_INVALID_ERROR )
{
*pInfo |= RTL_TEXTTOUNICODE_INFO_ERROR;
break;
}
else if ( (nFlags & RTL_TEXTTOUNICODE_FLAGS_INVALID_MASK) != RTL_TEXTTOUNICODE_FLAGS_INVALID_IGNORE )
{
if ( pDestBuf >= pEndDestBuf )
{
*pInfo |= RTL_TEXTTOUNICODE_INFO_ERROR | RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOSMALL;
break;
}
*pDestBuf++
= RTL_TEXTENC_UNICODE_REPLACEMENT_CHARACTER;
}
}
/* Write char to unicode buffer */
if ( pDestBuf >= pEndDestBuf )
{
*pInfo |= RTL_TEXTTOUNICODE_INFO_ERROR | RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOSMALL;
break;
}
*pDestBuf = c;
pDestBuf++;
}
}
pSrcBuf++;
}
}
while ( !bEnd );
if ( pContextData )
{
pContextData->mbShifted = bShifted;
pContextData->mbFirst = bFirst;
pContextData->mbWroteOne = bWroteOne;
pContextData->mnBitBuffer = nBitBuffer;
pContextData->mnBufferBits = nBufferBits;
}
*pSrcCvtBytes = nSrcBytes - (pEndSrcBuf-pSrcBuf);
return (nDestChars - (pEndDestBuf-pDestBuf));
}
/* ======================================================================= */
typedef struct
{
int mbShifted;
sal_uInt32 mnBitBuffer;
sal_uInt32 mnBufferBits;
} ImplUTF7FromUCContextData;
/* ----------------------------------------------------------------------- */
void* ImplUTF7CreateUnicodeToTextContext( void )
{
ImplUTF7FromUCContextData* pContextData;
pContextData = (ImplUTF7FromUCContextData*)rtl_allocateMemory( sizeof( ImplUTF7FromUCContextData ) );
pContextData->mbShifted = sal_False;
pContextData->mnBitBuffer = 0;
pContextData->mnBufferBits = 0;
return (void*)pContextData;
}
/* ----------------------------------------------------------------------- */
void ImplUTF7DestroyUnicodeToTextContext( void* pContext )
{
rtl_freeMemory( pContext );
}
/* ----------------------------------------------------------------------- */
void ImplUTF7ResetUnicodeToTextContext( void* pContext )
{
ImplUTF7FromUCContextData* pContextData = (ImplUTF7FromUCContextData*)pContext;
pContextData->mbShifted = sal_False;
pContextData->mnBitBuffer = 0;
pContextData->mnBufferBits = 0;
}
/* ----------------------------------------------------------------------- */
sal_Size ImplUnicodeToUTF7( const ImplTextConverterData* pData, void* pContext,
const sal_Unicode* pSrcBuf, sal_Size nSrcChars,
sal_Char* pDestBuf, sal_Size nDestBytes,
sal_uInt32 nFlags, sal_uInt32* pInfo,
sal_Size* pSrcCvtChars )
{
ImplUTF7FromUCContextData* pContextData = (ImplUTF7FromUCContextData*)pContext;
sal_Unicode c = '\0';
int bEnd = sal_False;
int bShifted;
int bNeedShift;
sal_uInt32 nBitBuffer;
sal_uInt32 nBitBufferTemp;
sal_uInt32 nBufferBits;
sal_Char* pEndDestBuf;
const sal_Unicode* pEndSrcBuf;
(void) pData; /* unused */
(void) nFlags; /* unused */
/* !!! Implementation not finnished !!!
if ( pContextData )
{
bShifted = pContextData->mbShifted;
nBitBuffer = pContextData->mnBitBuffer;
nBufferBits = pContextData->mnBufferBits;
}
else
*/
{
bShifted = sal_False;
nBitBuffer = 0;
nBufferBits = 0;
}
*pInfo = 0;
pEndDestBuf = pDestBuf+nDestBytes;
pEndSrcBuf = pSrcBuf+nSrcChars;
do
{
if ( pSrcBuf < pEndSrcBuf )
{
c = *pSrcBuf;
bNeedShift = (c > 0x7F) || aImplMustShiftTab[c];
if ( bNeedShift && !bShifted )
{
if ( pDestBuf >= pEndDestBuf )
{
*pInfo |= RTL_UNICODETOTEXT_INFO_ERROR | RTL_UNICODETOTEXT_INFO_DESTBUFFERTOSMALL;
break;
}
*pDestBuf = IMPL_SHIFT_IN_CHAR;
pDestBuf++;
/* Special case handling for SHIFT_IN_CHAR */
if ( c == IMPL_SHIFT_IN_CHAR )
{
if ( pDestBuf >= pEndDestBuf )
{
*pInfo |= RTL_UNICODETOTEXT_INFO_ERROR | RTL_UNICODETOTEXT_INFO_DESTBUFFERTOSMALL;
break;
}
*pDestBuf = IMPL_SHIFT_OUT_CHAR;
pDestBuf++;
}
else
bShifted = sal_True;
}
}
else
{
bEnd = sal_True;
bNeedShift = sal_False;
}
if ( bShifted )
{
/* Write the character to the bit buffer, or pad the bit */
/* buffer out to a full base64 character */
if ( bNeedShift )
{
nBufferBits += 16;
nBitBuffer |= ((sal_uInt32)c) << (32-nBufferBits);
}
else
nBufferBits += (6-(nBufferBits%6))%6;
/* Flush out as many full base64 characters as possible */
while ( (pDestBuf < pEndDestBuf) && (nBufferBits >= 6) )
{
nBitBufferTemp = nBitBuffer >> (32-6);
*pDestBuf = aImplBase64Tab[nBitBufferTemp];
pDestBuf++;
nBitBuffer <<= 6;
nBufferBits -= 6;
}
if ( nBufferBits >= 6 )
{
*pInfo |= RTL_UNICODETOTEXT_INFO_ERROR | RTL_UNICODETOTEXT_INFO_DESTBUFFERTOSMALL;
break;
}
/* Write SHIFT_OUT_CHAR, when needed */
if ( !bNeedShift )
{
if ( pDestBuf >= pEndDestBuf )
{
*pInfo |= RTL_UNICODETOTEXT_INFO_ERROR | RTL_UNICODETOTEXT_INFO_DESTBUFFERTOSMALL;
break;
}
*pDestBuf = IMPL_SHIFT_OUT_CHAR;
pDestBuf++;
bShifted = sal_False;
}
}
if ( !bEnd )
{
/* Character can be directly endcoded */
if ( !bNeedShift )
{
if ( pDestBuf >= pEndDestBuf )
{
*pInfo |= RTL_UNICODETOTEXT_INFO_ERROR | RTL_UNICODETOTEXT_INFO_DESTBUFFERTOSMALL;
break;
}
*pDestBuf = (sal_Char)(sal_uChar)c;
pDestBuf++;
}
pSrcBuf++;
}
}
while ( !bEnd );
if ( pContextData )
{
pContextData->mbShifted = bShifted;
pContextData->mnBitBuffer = nBitBuffer;
pContextData->mnBufferBits = nBufferBits;
}
*pSrcCvtChars = nSrcChars - (pEndSrcBuf-pSrcBuf);
return (nDestBytes - (pEndDestBuf-pDestBuf));
}
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