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/******************************************************************************
*
* Project: Common Portability Library
* Purpose: Implementation of CPLKeywordParser - a class for parsing
* the keyword format used for files like QuickBird .RPB files.
* This is a slight variation on the NASAKeywordParser used for
* the PDS/ISIS2/ISIS3 formats.
* Author: Frank Warmerdam <warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 2008, Frank Warmerdam <warmerdam@pobox.com>
* Copyright (c) 2009-2010, 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.
****************************************************************************/
//! @cond Doxygen_Suppress
#include "cpl_port.h"
#include "cplkeywordparser.h"
#include <cctype>
#include <cstring>
#include <string>
#include "cpl_string.h"
#include "cpl_vsi.h"
/************************************************************************/
/* ==================================================================== */
/* CPLKeywordParser */
/* ==================================================================== */
/************************************************************************/
/************************************************************************/
/* CPLKeywordParser() */
/************************************************************************/
CPLKeywordParser::CPLKeywordParser() = default;
/************************************************************************/
/* ~CPLKeywordParser() */
/************************************************************************/
CPLKeywordParser::~CPLKeywordParser()
{
CSLDestroy(papszKeywordList);
papszKeywordList = nullptr;
}
/************************************************************************/
/* Ingest() */
/************************************************************************/
int CPLKeywordParser::Ingest(VSILFILE *fp)
{
/* -------------------------------------------------------------------- */
/* Read in buffer till we find END all on its own line. */
/* -------------------------------------------------------------------- */
for (; true;)
{
char szChunk[513] = {};
const size_t nBytesRead = VSIFReadL(szChunk, 1, 512, fp);
szChunk[nBytesRead] = '\0';
osHeaderText += szChunk;
if (nBytesRead < 512)
break;
const char *pszCheck = nullptr;
if (osHeaderText.size() > 520)
pszCheck = osHeaderText.c_str() + (osHeaderText.size() - 520);
else
pszCheck = szChunk;
if (strstr(pszCheck, "\r\nEND;\r\n") != nullptr ||
strstr(pszCheck, "\nEND;\n") != nullptr)
break;
}
pszHeaderNext = osHeaderText.c_str();
/* -------------------------------------------------------------------- */
/* Process name/value pairs, keeping track of a "path stack". */
/* -------------------------------------------------------------------- */
return ReadGroup("", 0);
}
/************************************************************************/
/* ReadGroup() */
/************************************************************************/
bool CPLKeywordParser::ReadGroup(const char *pszPathPrefix, int nRecLevel)
{
CPLString osName;
CPLString osValue;
// Arbitrary threshold to avoid stack overflow
if (nRecLevel == 100)
return false;
for (; true;)
{
if (!ReadPair(osName, osValue))
return false;
if (EQUAL(osName, "BEGIN_GROUP") || EQUAL(osName, "GROUP"))
{
if (!ReadGroup((CPLString(pszPathPrefix) + osValue + ".").c_str(),
nRecLevel + 1))
return false;
}
else if (STARTS_WITH_CI(osName, "END"))
{
return true;
}
else
{
osName = pszPathPrefix + osName;
papszKeywordList =
CSLSetNameValue(papszKeywordList, osName, osValue);
}
}
}
/************************************************************************/
/* ReadPair() */
/* */
/* Read a name/value pair from the input stream. Strip off */
/* white space, ignore comments, split on '='. */
/************************************************************************/
bool CPLKeywordParser::ReadPair(CPLString &osName, CPLString &osValue)
{
osName = "";
osValue = "";
if (!ReadWord(osName))
return false;
SkipWhite();
if (EQUAL(osName, "END"))
return TRUE;
if (*pszHeaderNext != '=')
{
// ISIS3 does not have anything after the end group/object keyword.
return EQUAL(osName, "End_Group") || EQUAL(osName, "End_Object");
}
pszHeaderNext++;
SkipWhite();
osValue = "";
// Handle value lists like: Name = (Red, Red)
// or list of lists like: TLCList = ( (0, 0.000000), (8299, 4.811014) );
if (*pszHeaderNext == '(')
{
CPLString osWord;
int nDepth = 0;
const char *pszLastPos = pszHeaderNext;
while (ReadWord(osWord) && pszLastPos != pszHeaderNext)
{
SkipWhite();
pszLastPos = pszHeaderNext;
osValue += osWord;
const char *pszIter = osWord.c_str();
bool bInQuote = false;
while (*pszIter != '\0')
{
if (*pszIter == '"')
bInQuote = !bInQuote;
else if (!bInQuote)
{
if (*pszIter == '(')
nDepth++;
else if (*pszIter == ')')
{
nDepth--;
if (nDepth == 0)
break;
}
}
pszIter++;
}
if (*pszIter == ')' && nDepth == 0)
break;
}
}
else // Handle more normal "single word" values.
{
// Special case to handle non-conformant IMD files generated by
// previous GDAL version where we omit to surround values that have
// spaces with double quotes.
// So we use a heuristics to handle things like:
// key = value with spaces without single or double quotes at
// beginning of value;[\r]\n
const char *pszNextLF = strchr(pszHeaderNext, '\n');
if (pszNextLF)
{
std::string osTxt(pszHeaderNext, pszNextLF - pszHeaderNext);
const auto nCRPos = osTxt.find('\r');
const auto nSemiColonPos = osTxt.find(';');
const auto nQuotePos = osTxt.find('\'');
const auto nDoubleQuotePos = osTxt.find('"');
const auto nLTPos = osTxt.find('<');
if (nSemiColonPos != std::string::npos &&
(nCRPos == std::string::npos || (nCRPos + 1 == osTxt.size())) &&
((nCRPos != std::string::npos &&
(nSemiColonPos + 1 == nCRPos)) ||
(nCRPos == std::string::npos &&
(nSemiColonPos + 1 == osTxt.size()))) &&
(nQuotePos == std::string::npos || nQuotePos != 0) &&
(nDoubleQuotePos == std::string::npos ||
nDoubleQuotePos != 0) &&
(nLTPos == std::string::npos ||
osTxt.find('>') == std::string::npos))
{
pszHeaderNext = pszNextLF;
osTxt.resize(nSemiColonPos);
osValue = osTxt;
while (!osValue.empty() && osValue.back() == ' ')
osValue.resize(osValue.size() - 1);
return true;
}
}
if (!ReadWord(osValue))
return false;
}
SkipWhite();
// No units keyword?
if (*pszHeaderNext != '<')
return true;
// Append units keyword. For lines that like like this:
// MAP_RESOLUTION = 4.0 <PIXEL/DEGREE>
CPLString osWord;
osValue += " ";
while (ReadWord(osWord))
{
SkipWhite();
osValue += osWord;
if (osWord.back() == '>')
break;
}
return true;
}
/************************************************************************/
/* ReadWord() */
/************************************************************************/
bool CPLKeywordParser::ReadWord(CPLString &osWord)
{
osWord = "";
SkipWhite();
if (*pszHeaderNext == '\0' || *pszHeaderNext == '=')
return false;
while (*pszHeaderNext != '\0' && *pszHeaderNext != '=' &&
*pszHeaderNext != ';' &&
!isspace(static_cast<unsigned char>(*pszHeaderNext)))
{
if (*pszHeaderNext == '"')
{
osWord += *(pszHeaderNext++);
while (*pszHeaderNext != '"')
{
if (*pszHeaderNext == '\0')
return false;
osWord += *(pszHeaderNext++);
}
osWord += *(pszHeaderNext++);
}
else if (*pszHeaderNext == '\'')
{
osWord += *(pszHeaderNext++);
while (*pszHeaderNext != '\'')
{
if (*pszHeaderNext == '\0')
return false;
osWord += *(pszHeaderNext++);
}
osWord += *(pszHeaderNext++);
}
else
{
osWord += *pszHeaderNext;
pszHeaderNext++;
}
}
if (*pszHeaderNext == ';')
pszHeaderNext++;
return true;
}
/************************************************************************/
/* SkipWhite() */
/************************************************************************/
void CPLKeywordParser::SkipWhite()
{
for (; true;)
{
// Skip white space (newline, space, tab, etc )
if (isspace(static_cast<unsigned char>(*pszHeaderNext)))
{
pszHeaderNext++;
continue;
}
// Skip C style comments
if (*pszHeaderNext == '/' && pszHeaderNext[1] == '*')
{
pszHeaderNext += 2;
while (*pszHeaderNext != '\0' &&
(*pszHeaderNext != '*' || pszHeaderNext[1] != '/'))
{
pszHeaderNext++;
}
if (*pszHeaderNext == '\0')
break;
pszHeaderNext += 2;
continue;
}
// Skip # style comments
if (*pszHeaderNext == '#')
{
pszHeaderNext += 1;
// consume till end of line.
while (*pszHeaderNext != '\0' && *pszHeaderNext != 10 &&
*pszHeaderNext != 13)
{
pszHeaderNext++;
}
continue;
}
// not white space, return.
return;
}
}
/************************************************************************/
/* GetKeyword() */
/************************************************************************/
const char *CPLKeywordParser::GetKeyword(const char *pszPath,
const char *pszDefault)
{
const char *pszResult = CSLFetchNameValue(papszKeywordList, pszPath);
if (pszResult == nullptr)
return pszDefault;
return pszResult;
}
//! @endcond
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