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/******************************************************************************
*
* Project: OGR
* Purpose: Convenience function for parsing with Expat library
* Author: Even Rouault, even dot rouault at spatialys.com
*
******************************************************************************
* Copyright (c) 2009-2012, Even Rouault <even dot rouault at spatialys.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#ifdef HAVE_EXPAT
#include "cpl_port.h"
#include "cpl_conv.h"
#include "cpl_string.h"
#include "ogr_expat.h"
#include <cstddef>
#include <cstdlib>
#include "cpl_error.h"
constexpr size_t OGR_EXPAT_MAX_ALLOWED_ALLOC = 10000000;
static void *OGRExpatMalloc(size_t size) CPL_WARN_UNUSED_RESULT;
static void *OGRExpatRealloc(void *ptr, size_t size) CPL_WARN_UNUSED_RESULT;
/************************************************************************/
/* CanAlloc() */
/************************************************************************/
static bool CanAlloc(size_t size)
{
if (size < OGR_EXPAT_MAX_ALLOWED_ALLOC)
return true;
if (CPLTestBool(CPLGetConfigOption("OGR_EXPAT_UNLIMITED_MEM_ALLOC", "NO")))
return true;
CPLError(
CE_Failure, CPLE_OutOfMemory,
"Expat tried to malloc %d bytes. File probably corrupted. "
"This may also happen in case of a very big XML comment, in which case "
"you may define the OGR_EXPAT_UNLIMITED_MEM_ALLOC configuration "
"option to YES to remove that protection.",
static_cast<int>(size));
return false;
}
/************************************************************************/
/* OGRExpatMalloc() */
/************************************************************************/
static void *OGRExpatMalloc(size_t size)
{
if (CanAlloc(size))
return malloc(size);
return nullptr;
}
/************************************************************************/
/* OGRExpatRealloc() */
/************************************************************************/
// Caller must replace the pointer with the returned pointer.
static void *OGRExpatRealloc(void *ptr, size_t size)
{
if (CanAlloc(size))
return realloc(ptr, size);
return nullptr;
}
/************************************************************************/
/* FillWINDOWS1252() */
/************************************************************************/
static void FillWINDOWS1252(XML_Encoding *info)
{
// Map CP1252 bytes to Unicode values.
for (int i = 0; i < 0x80; ++i)
info->map[i] = i;
info->map[0x80] = 0x20AC;
info->map[0x81] = -1;
info->map[0x82] = 0x201A;
info->map[0x83] = 0x0192;
info->map[0x84] = 0x201E;
info->map[0x85] = 0x2026;
info->map[0x86] = 0x2020;
info->map[0x87] = 0x2021;
info->map[0x88] = 0x02C6;
info->map[0x89] = 0x2030;
info->map[0x8A] = 0x0160;
info->map[0x8B] = 0x2039;
info->map[0x8C] = 0x0152;
info->map[0x8D] = -1;
info->map[0x8E] = 0x017D;
info->map[0x8F] = -1;
info->map[0x90] = -1;
info->map[0x91] = 0x2018;
info->map[0x92] = 0x2019;
info->map[0x93] = 0x201C;
info->map[0x94] = 0x201D;
info->map[0x95] = 0x2022;
info->map[0x96] = 0x2013;
info->map[0x97] = 0x2014;
info->map[0x98] = 0x02DC;
info->map[0x99] = 0x2122;
info->map[0x9A] = 0x0161;
info->map[0x9B] = 0x203A;
info->map[0x9C] = 0x0153;
info->map[0x9D] = -1;
info->map[0x9E] = 0x017E;
info->map[0x9F] = 0x0178;
for (int i = 0xA0; i <= 0xFF; ++i)
info->map[i] = i;
}
/************************************************************************/
/* FillISO885915() */
/************************************************************************/
static void FillISO885915(XML_Encoding *info)
{
// Map ISO-8859-15 bytes to Unicode values.
// Generated by generate_encoding_table.c.
for (int i = 0x00; i < 0xA4; ++i)
info->map[i] = i;
info->map[0xA4] = 0x20AC;
info->map[0xA5] = 0xA5;
info->map[0xA6] = 0x0160;
info->map[0xA7] = 0xA7;
info->map[0xA8] = 0x0161;
for (int i = 0xA9; i < 0xB4; ++i)
info->map[i] = i;
info->map[0xB4] = 0x017D;
for (int i = 0xB5; i < 0xB8; ++i)
info->map[i] = i;
info->map[0xB8] = 0x017E;
for (int i = 0xB9; i < 0xBC; ++i)
info->map[i] = i;
info->map[0xBC] = 0x0152;
info->map[0xBD] = 0x0153;
info->map[0xBE] = 0x0178;
for (int i = 0xBF; i < 0x100; ++i)
info->map[i] = i;
}
/************************************************************************/
/* OGRExpatUnknownEncodingHandler() */
/************************************************************************/
static int
OGRExpatUnknownEncodingHandler(void * /* unused_encodingHandlerData */,
const XML_Char *name, XML_Encoding *info)
{
if (EQUAL(name, "WINDOWS-1252"))
FillWINDOWS1252(info);
else if (EQUAL(name, "ISO-8859-15"))
FillISO885915(info);
else
{
CPLDebug("OGR", "Unhandled encoding %s", name);
return XML_STATUS_ERROR;
}
info->data = nullptr;
info->convert = nullptr;
info->release = nullptr;
return XML_STATUS_OK;
}
/************************************************************************/
/* OGRCreateExpatXMLParser() */
/************************************************************************/
XML_Parser OGRCreateExpatXMLParser()
{
XML_Memory_Handling_Suite memsuite;
memsuite.malloc_fcn = OGRExpatMalloc;
memsuite.realloc_fcn = OGRExpatRealloc;
memsuite.free_fcn = free;
XML_Parser hParser = XML_ParserCreate_MM(nullptr, &memsuite, nullptr);
XML_SetUnknownEncodingHandler(hParser, OGRExpatUnknownEncodingHandler,
nullptr);
return hParser;
}
#endif // HAVE_EXPAT
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