668 lines
16 KiB
C++
668 lines
16 KiB
C++
/*
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* Automatic language and codepage detector
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*
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* Bob Powell, 2/97
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* Copyright (C) 1996, 1997, Microsoft Corp. All rights reserved.
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*
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* History: 1-Feb-97 BobP Created
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* 5-Aug-97 BobP Unicode support; Charmaps in data file.
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*/
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#include "private.h"
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/****************************************************************/
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Histogram::Histogram (const PFileHistogramSection pHS, const PHIdx pMap)
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: m_nDimensionality((UCHAR)pHS->m_dwDimensionality),
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m_nEdgeSize((UCHAR)pHS->m_dwEdgeSize),
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m_nCodePage((USHORT)pHS->m_dwCodePage),
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m_pMap(pMap),
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m_panElts((HElt *)&pHS[1]) // table follows header struct in the file
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{
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// #elements = #unique character values ^ #dimensions
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m_nElts = 1;
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for (UCHAR i = 0; i < m_nDimensionality; i++)
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m_nElts *= m_nEdgeSize;
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}
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DWORD
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Histogram::Validate (DWORD nBytes) const
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{
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if ( nBytes < m_nElts * sizeof(HElt) ||
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m_nDimensionality > 4 )
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{
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return ERROR_INTERNAL_DB_CORRUPTION;
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}
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return NO_ERROR;
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}
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Histogram::Histogram (const Histogram &H, const PHIdx pMap)
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: m_nDimensionality(H.m_nDimensionality),
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m_nEdgeSize(H.m_nEdgeSize),
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m_nCodePage(H.m_nCodePage),
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m_nElts(H.m_nElts),
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m_pMap(pMap),
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m_panElts(H.m_panElts)
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//
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// Clone a histogram but use a different Charmap.
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{
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}
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Histogram::~Histogram (void)
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//
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// The pointer members point to the mapped file and do not need to be freed.
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{
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}
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/****************************************************************/
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Language::Language (PLCDetect pL, int nLangID, int nCodePages, int nRangeID)
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: m_pLC(pL),
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m_nLangID(nLangID),
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m_nCodePages(nCodePages),
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m_nRangeID(nRangeID)
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{
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}
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Language7Bit::Language7Bit (PLCDetect pL, int nLangID, int nCodePages)
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: Language(pL, nLangID, nCodePages),
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m_pLangHistogram(NULL)
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{
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memset ((void *)m_ppCodePageHistogram, 0, sizeof(m_ppCodePageHistogram));
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}
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Language7Bit::~Language7Bit (void)
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{
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if (m_pLangHistogram)
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delete m_pLangHistogram;
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for (int i = 0; i < MAXSUBLANG; i++)
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if (m_ppCodePageHistogram[i])
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delete m_ppCodePageHistogram[i];
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}
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DWORD
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Language7Bit::AddHistogram (PFileHistogramSection pHS, DWORD nBytes, int nIdx)
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//
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// Add the raw histogram at *pHS in the mapped file to this language object.
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// The histograms must be for 7-bit detection.
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{
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DWORD hr = NO_ERROR;
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PHIdx pMap = m_pLC->GetMap( pHS->m_dwMappingID );
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if (nIdx == 0)
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{
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// The first histogram for a language is its language-detection table.
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if ( (m_pLangHistogram = new Histogram (pHS, pMap)) == NULL)
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return ERROR_OUTOFMEMORY;
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if ((hr = m_pLangHistogram->Validate (nBytes)) != NO_ERROR)
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return hr;
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}
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else
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{
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// Each subsequent histogram is a code page detection table.
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if (nIdx - 1 >= m_nCodePages)
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return ERROR_INTERNAL_DB_CORRUPTION;
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Histogram *pH;
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if ((pH = new Histogram (pHS, pMap)) == NULL)
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return ERROR_OUTOFMEMORY;
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if ((hr = pH->Validate (nBytes)) != NO_ERROR)
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return hr;
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m_ppCodePageHistogram[nIdx - 1] = pH;
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// Cache for the scoring vector math
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m_paHElt[nIdx - 1] = pH->Array();
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}
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return hr;
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}
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/****************************************************************/
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Language8Bit::Language8Bit (PLCDetect pL, int nLangID, int nCodePages)
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: Language(pL, nLangID, nCodePages)
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{
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memset ((void *)m_ppHistogram, 0, sizeof(m_ppHistogram));
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}
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Language8Bit::~Language8Bit (void)
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{
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for (int i = 0; i < MAXSUBLANG; i++)
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if (m_ppHistogram[i])
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delete m_ppHistogram[i];
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}
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DWORD
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Language8Bit::AddHistogram (PFileHistogramSection pHS, DWORD nBytes, int nIdx)
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//
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// Add the raw histogram at *pHS to this language object.
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// This language is known to use 8-bit detection.
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{
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DWORD hr = NO_ERROR;
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PHIdx pMap = m_pLC->GetMap( pHS->m_dwMappingID );
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// The histograms are the direct language-code page tables
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if (nIdx >= m_nCodePages)
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return ERROR_INTERNAL_DB_CORRUPTION;
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Histogram *pH;
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if ((pH = new Histogram (pHS, pMap)) == NULL)
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return ERROR_OUTOFMEMORY;
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if ((hr = pH->Validate (nBytes)) != NO_ERROR)
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return hr;
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m_ppHistogram[nIdx] = pH;
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return hr;
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}
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/****************************************************************/
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LanguageUnicode::LanguageUnicode (PLCDetect pL, int nLangID,
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int nSubLangs, int nRangeID)
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: Language(pL, nLangID, nSubLangs, nRangeID)
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{
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memset ((void *)m_ppSubLangHistogram, 0, sizeof(m_ppSubLangHistogram));
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}
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LanguageUnicode::~LanguageUnicode (void)
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{
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for (int i = 0; i < MAXSUBLANG; i++)
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if (m_ppSubLangHistogram[i])
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delete m_ppSubLangHistogram[i];
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}
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DWORD
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LanguageUnicode::AddHistogram (PFileHistogramSection pHS, DWORD nBytes, int nIdx)
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{
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DWORD hr = NO_ERROR;
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// All histograms for are sublanguage detection
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if (nIdx >= m_nSubLangs)
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return ERROR_INTERNAL_DB_CORRUPTION;
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// Get the custom charmap used for scoring this sublanguage group
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PHIdx pMap = m_pLC->GetMap( pHS->m_dwMappingID );
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Histogram *pH;
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if ((pH = new Histogram (pHS, pMap)) == NULL)
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return ERROR_OUTOFMEMORY;
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if ((hr = pH->Validate (nBytes)) != NO_ERROR)
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return hr;
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m_ppSubLangHistogram[nIdx] = pH;
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m_paHElt[nIdx] = pH->Array();
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return hr;
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}
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/****************************************************************/
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LCDetect::LCDetect (HMODULE hM)
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: m_hModule(hM),
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m_nCharmaps(0),
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m_n7BitLanguages(0),
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m_n8BitLanguages(0),
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m_nUnicodeLanguages(0),
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m_n7BitLangsRead(0),
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m_n8BitLangsRead(0),
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m_nUnicodeLangsRead(0),
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m_nMapsRead(0),
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m_nHistogramsRead(0),
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m_nScoreIdx(0),
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m_pp7BitLanguages(NULL),
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m_pp8BitLanguages(NULL),
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m_ppUnicodeLanguages(NULL),
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m_ppCharmaps(NULL),
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m_pv(NULL),
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m_hmap(0),
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m_hf(0),
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m_pHU27Bit(0)
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{
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}
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LCDetect::~LCDetect ()
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{
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delete m_pHU27Bit;
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for (unsigned int i = 0; i < m_n7BitLanguages; i++)
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delete m_pp7BitLanguages[i];
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delete m_pp7BitLanguages;
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for (i = 0; i < m_n8BitLanguages; i++)
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delete m_pp8BitLanguages[i];
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delete m_pp8BitLanguages;
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for (i = 0; i < m_nUnicodeLanguages; i++)
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delete m_ppUnicodeLanguages[i];
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delete m_ppUnicodeLanguages;
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for (i = 0; i < m_nCharmaps; i++)
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delete m_ppCharmaps[i];
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delete m_ppCharmaps;
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if (m_pv)
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UnmapViewOfFile (m_pv);
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CloseHandle (m_hmap);
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CloseHandle (m_hf);
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}
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DWORD
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LCDetect::Initialize7BitLanguage (PFileLanguageSection pLS, PLanguage *ppL)
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//
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// Set *ppL to the Language object created from this section.
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{
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// nRecordCount is lang histogram (1) + # of code page histograms
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if ( m_n7BitLangsRead >= m_n7BitLanguages || pLS->m_dwRecordCount < 1)
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return ERROR_INTERNAL_DB_CORRUPTION;
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PLanguage7Bit pL = new Language7Bit (this, pLS->m_dwLangID, pLS->m_dwRecordCount - 1);
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if (pL == NULL)
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return ERROR_OUTOFMEMORY;
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// Each 7-bit lang uses one score index slot per code page.
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// The range starts with the 7-bit langs, since both the 8-bit
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// and Unicode langs follow it.
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if (m_n7BitLangsRead == 0 && m_nScoreIdx != 0)
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return ERROR_INTERNAL_DB_CORRUPTION;;
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pL->SetScoreIdx(m_nScoreIdx);
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m_nScoreIdx += pLS->m_dwRecordCount - 1; // skip 1st record (Language)
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m_pp7BitLanguages[ m_n7BitLangsRead++ ] = pL;
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*ppL = pL;
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return NO_ERROR;
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}
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DWORD
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LCDetect::Initialize8BitLanguage (PFileLanguageSection pLS, Language **ppL)
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//
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// Set *ppL to the Language object created from this section.
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{
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// nRecordCount is # of combined language / code page histograms
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if ( m_n8BitLangsRead >= m_n8BitLanguages || pLS->m_dwRecordCount < 1)
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return ERROR_INTERNAL_DB_CORRUPTION;
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PLanguage8Bit pL = new Language8Bit (this, pLS->m_dwLangID, pLS->m_dwRecordCount);
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if (pL == NULL)
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return ERROR_OUTOFMEMORY;
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// The 8-bit score indices follow the 7-bit languages
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// Each 8-bit lang uses a score index slot for each of its code pages,
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// since all the code pages are scored in the initial scoring pass.
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// The number of slots is the number of code page histograms, which is
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// one less than the number of records following this language.
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pL->SetScoreIdx(m_nScoreIdx);
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m_nScoreIdx += pLS->m_dwRecordCount;
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m_pp8BitLanguages[ m_n8BitLangsRead++ ] = pL;
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*ppL = pL;
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return NO_ERROR;
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}
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DWORD
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LCDetect::InitializeUnicodeLanguage (PFileLanguageSection pLS, Language **ppL)
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//
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// Set *ppL to the Language object created from this section.
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{
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// nRecordCount is # of sublanguage histograms
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if ( m_nUnicodeLangsRead >= m_nUnicodeLanguages ||
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pLS->m_dwUnicodeRangeID >= m_nUnicodeLanguages )
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{
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return ERROR_INTERNAL_DB_CORRUPTION;
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}
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PLanguageUnicode pL = new LanguageUnicode (this, pLS->m_dwLangID,
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pLS->m_dwRecordCount, pLS->m_dwUnicodeRangeID);
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if (pL == NULL)
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return ERROR_OUTOFMEMORY;
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// The Unicode score indices follow the 7-bit languages, and overlay the
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// 8-bit slots since they aren't used at the same time.
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if (m_nUnicodeLangsRead == 0 && GetN8BitLanguages() > 0)
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m_nScoreIdx = Get8BitLanguage(0)->GetScoreIdx();
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// Each Unicode entry uses exactly one score index. SBCS subdetection
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// (Latin group) uses the slots for the corresponding 7-bit languages,
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// and Unicode subdetection (CJK) uses the slots already defined for the
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// Unicode sub-languages.
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pL->SetScoreIdx(m_nScoreIdx);
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m_nScoreIdx++;
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// For Unicode, the range ID is used as the Language array index.
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m_ppUnicodeLanguages[ pLS->m_dwUnicodeRangeID ] = pL;
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m_nUnicodeLangsRead++;
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*ppL = pL;
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return NO_ERROR;
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}
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DWORD
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LCDetect::LoadLanguageSection (void *pv, int nSectionSize, PLanguage *ppL)
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//
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// A language section begins the definition of data for a language.
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// Each language has exactly one of these records. One or more
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// histogram sections follow each language, and are always associated
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// with the language of the preceding language section.
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//
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// Set *ppL to the Language object created from this section.
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{
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DWORD hr = NO_ERROR;
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PFileLanguageSection pLS;
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pLS = (PFileLanguageSection)&((char *)pv)[sizeof(FileSection)];
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switch ( pLS->m_dwDetectionType ) {
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case DETECT_7BIT:
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hr = Initialize7BitLanguage (pLS, ppL);
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break;
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case DETECT_8BIT:
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hr = Initialize8BitLanguage (pLS, ppL);
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break;
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case DETECT_UNICODE:
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hr = InitializeUnicodeLanguage (pLS, ppL);
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break;
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}
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return hr;
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}
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DWORD
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LCDetect::LoadHistogramSection (void *pv, int nSectionSize, Language *pL)
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{
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PFileHistogramSection pHS;
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pHS = (PFileHistogramSection)&((char *)pv)[sizeof(FileSection)];
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int nBytes = nSectionSize - sizeof(FileSection) - sizeof(*pHS);
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return pL->AddHistogram ( pHS, nBytes, m_nHistogramsRead++);
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}
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DWORD
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LCDetect::LoadMapSection (void *pv, int nSectionSize)
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{
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PFileMapSection pMS;
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pMS = (PFileMapSection)&((char *)pv)[sizeof(FileSection)];
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int nBytes = nSectionSize - sizeof(FileSection) - sizeof(*pMS);
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if (m_nMapsRead >= m_nCharmaps)
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return ERROR_INTERNAL_DB_CORRUPTION;
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PCharmap pM = new Charmap (pMS);
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if (pM == NULL)
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return ERROR_OUTOFMEMORY;
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m_ppCharmaps[ m_nMapsRead++ ] = pM;
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return NO_ERROR;
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}
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DWORD
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LCDetect::BuildState (DWORD nFileSize)
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//
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// Build the detection structures from the mapped training file image at *m_pv
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{
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PLanguage pL;
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PFileHeader pFH;
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PFileSection pFS;
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DWORD hr = NO_ERROR;
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// Validate header
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pFH = (PFileHeader) m_pv;
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if ( nFileSize < sizeof(*pFH) ||
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pFH->m_dwAppSig != APP_SIGNATURE ||
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pFH->m_dwVersion != APP_VERSION ||
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pFH->m_dwHdrSizeBytes >= nFileSize ||
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pFH->m_dwN7BitLanguages == 0 ||
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pFH->m_dwN8BitLanguages == 0 ||
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pFH->m_dwNUnicodeLanguages == 0 ||
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pFH->m_dwNCharmaps == 0 )
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{
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return ERROR_INTERNAL_DB_CORRUPTION;
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}
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// Allocate language pointer table per header
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m_n7BitLanguages = pFH->m_dwN7BitLanguages;
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m_pp7BitLanguages = new PLanguage7Bit [m_n7BitLanguages];
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m_n8BitLanguages = pFH->m_dwN8BitLanguages;
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m_pp8BitLanguages = new PLanguage8Bit [m_n8BitLanguages];
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m_nUnicodeLanguages = pFH->m_dwNUnicodeLanguages;
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m_ppUnicodeLanguages = new PLanguageUnicode [m_nUnicodeLanguages];
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m_nCharmaps = pFH->m_dwNCharmaps;
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m_ppCharmaps = new PCharmap [m_nCharmaps];
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if ( m_pp7BitLanguages == NULL ||
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m_pp8BitLanguages == NULL ||
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m_ppUnicodeLanguages == NULL ||
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m_ppCharmaps == NULL )
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{
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return ERROR_OUTOFMEMORY;
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}
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// Clear, because not all slots may be assigned
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memset (m_ppUnicodeLanguages, 0, sizeof(PLanguageUnicode) * m_nUnicodeLanguages);
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// Remember other header info
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m_LCDConfigureDefault.nMin7BitScore = pFH->m_dwMin7BitScore;
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m_LCDConfigureDefault.nMin8BitScore = pFH->m_dwMin8BitScore;
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m_LCDConfigureDefault.nMinUnicodeScore = pFH->m_dwMinUnicodeScore;
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m_LCDConfigureDefault.nRelativeThreshhold = pFH->m_dwRelativeThreshhold;
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m_LCDConfigureDefault.nDocPctThreshhold = pFH->m_dwDocPctThreshhold;
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m_LCDConfigureDefault.nChunkSize = pFH->m_dwChunkSize;
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// Position to first section
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pFS = (PFileSection) &((char *)m_pv)[pFH->m_dwHdrSizeBytes];
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// Read and process each file section
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while ( hr == NO_ERROR ) {
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// check alignment
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if (((DWORD_PTR)pFS & 3) != 0) {
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hr = ERROR_INTERNAL_DB_CORRUPTION;
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break;
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}
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// zero-length section marks end of data
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if (pFS->m_dwSizeBytes == 0)
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break;
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if ( &((char *)pFS)[pFS->m_dwSizeBytes] >= &((char *)m_pv)[nFileSize]) {
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hr = ERROR_INTERNAL_DB_CORRUPTION;
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break;
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}
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switch ( pFS->m_dwType ) {
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case SECTION_TYPE_LANGUAGE: // sets pL
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|
hr = LoadLanguageSection ((void*)pFS, pFS->m_dwSizeBytes, &pL);
|
|
m_nHistogramsRead = 0;
|
|
break;
|
|
|
|
case SECTION_TYPE_HISTOGRAM: // uses pL
|
|
hr = LoadHistogramSection ((void*)pFS, pFS->m_dwSizeBytes, pL);
|
|
break;
|
|
|
|
case SECTION_TYPE_MAP:
|
|
hr = LoadMapSection ((void*)pFS, pFS->m_dwSizeBytes);
|
|
break;
|
|
|
|
default: // ignore unrecognized sections
|
|
break;
|
|
}
|
|
|
|
pFS = (PFileSection) &((char *)pFS)[pFS->m_dwSizeBytes];
|
|
}
|
|
|
|
if (hr != NO_ERROR)
|
|
return hr;
|
|
|
|
if ( m_nMapsRead != m_nCharmaps )
|
|
return ERROR_INTERNAL_DB_CORRUPTION;
|
|
|
|
|
|
// Set up quick-reference arrays used by the scoring inner loops
|
|
|
|
for (unsigned int i = 0; i < GetN7BitLanguages(); i++)
|
|
m_paHElt7Bit[i] = Get7BitLanguage(i)->GetLangHistogram()->Array();
|
|
|
|
m_nHElt8Bit = 0;
|
|
for (i = 0; i < GetN8BitLanguages(); i++)
|
|
{
|
|
PLanguage8Bit pL = Get8BitLanguage(i);
|
|
|
|
for (int j = 0; j < pL->NCodePages(); j++)
|
|
m_paHElt8Bit[m_nHElt8Bit++] = pL->GetHistogram(j)->Array();
|
|
}
|
|
|
|
// Set up the Histogram used for ScoreVectorW() for scoring Unicode
|
|
// text for 7-bit language detection. Clone the first 7-bit language
|
|
// histogram and replace its map with CHARMAP_U27BIT.
|
|
|
|
m_pHU27Bit = new Histogram ( *Get7BitLanguage(0)->GetLangHistogram(),
|
|
GetMap(CHARMAP_U27BIT));
|
|
|
|
return hr;
|
|
}
|
|
|
|
|
|
DWORD
|
|
LCDetect::LoadState (void)
|
|
//
|
|
// Overall initialization and state loading. Open the compiled training
|
|
// file from its fixed location in the System32 directory, and assemble
|
|
// in-memory detection tables from its contents.
|
|
{
|
|
DWORD hr = NO_ERROR;
|
|
DWORD nFileSize;
|
|
#define MODULENAMELEN 100
|
|
char szFilename[MODULENAMELEN+50], *p;
|
|
|
|
// Find out if NT or Windows
|
|
|
|
OSVERSIONINFOA OSVersionInfo;
|
|
int nOSWinNT = 0;
|
|
OSVersionInfo.dwOSVersionInfoSize = sizeof( OSVERSIONINFOA );
|
|
if ( GetVersionExA( &OSVersionInfo ) )
|
|
nOSWinNT = OSVersionInfo.dwPlatformId;
|
|
|
|
// Open the training data file,
|
|
// look in the directory that contains the DLL.
|
|
|
|
if (GetModuleFileNameA (m_hModule, szFilename, MODULENAMELEN) == 0)
|
|
return GetLastError();
|
|
|
|
if ( (p = strrchr (szFilename, '\\')) != NULL ||
|
|
(p = strrchr (szFilename, ':')) != NULL )
|
|
{
|
|
*++p = 0;
|
|
}
|
|
else
|
|
*szFilename = 0;
|
|
strcat (szFilename, DETECTION_DATA_FILENAME);
|
|
|
|
if ((m_hf = CreateFileA (szFilename, GENERIC_READ, FILE_SHARE_READ,
|
|
NULL, OPEN_EXISTING,
|
|
FILE_ATTRIBUTE_NORMAL, NULL)) == INVALID_HANDLE_VALUE)
|
|
{
|
|
return E_FAIL;
|
|
}
|
|
|
|
if ((nFileSize = GetFileSize (m_hf, NULL)) == 0xffffffff) {
|
|
hr = GetLastError();
|
|
CloseHandle (m_hf);
|
|
return hr;
|
|
}
|
|
|
|
// Virtual-map the file
|
|
|
|
if ( nOSWinNT == VER_PLATFORM_WIN32_NT )
|
|
m_hmap = CreateFileMapping (m_hf, NULL, PAGE_READONLY, 0, nFileSize, NULL);
|
|
else
|
|
m_hmap = CreateFileMappingA (m_hf, NULL, PAGE_READONLY, 0, nFileSize, NULL);
|
|
|
|
if (m_hmap == NULL) {
|
|
hr = GetLastError();
|
|
CloseHandle (m_hf);
|
|
return hr;
|
|
}
|
|
|
|
if ((m_pv = MapViewOfFile (m_hmap, FILE_MAP_READ, 0, 0, 0 )) == NULL) {
|
|
hr = GetLastError();
|
|
CloseHandle (m_hmap);
|
|
CloseHandle (m_hf);
|
|
return hr;
|
|
}
|
|
|
|
// Build the in-memory structures from the file
|
|
|
|
hr = BuildState (nFileSize);
|
|
|
|
return hr;
|
|
}
|
|
|
|
/****************************************************************/
|