151 lines
4.6 KiB
C
151 lines
4.6 KiB
C
#ifndef __CLASSBIGRAM__
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#define __CLASSBIGRAM__
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/******************************************************************************\
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* FILE: clbigram.h
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*
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* Public structures and functions library that are used to access the
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* class bigram information.
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*
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* Note that the code to create the binary file is in clbigram, not in the
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* common library.
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\******************************************************************************/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/************************************************************************************************\
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* Public interface to class bigram data.
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\************************************************************************************************/
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//
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// Structures and types
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//
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// Structure giving access to a loaded copy of the class bigram tables.
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typedef struct tagCLASS_BIGRAM_INFO {
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WORD cNumClasses; // Number of classes
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BYTE *pProbTable; // Probability table
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void *pLoadInfo1; // Handles needed to unload the data
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void *pLoadInfo2;
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void *pLoadInfo3;
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} CLASS_BIGRAM_INFO;
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//
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// Functions.
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//
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// Load class bigram information from a file.
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BOOL ClassBigramLoadFile(LOCRUN_INFO *pLocRunInfo, CLASS_BIGRAM_INFO *pBigramInfo, wchar_t *pPath);
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// Unload runtime localization information that was loaded from a file.
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BOOL ClassBigramUnloadFile(CLASS_BIGRAM_INFO *pBigramInfo);
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// Load class bigram information from a resource.
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// Note, don't need to unload resources.
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BOOL ClassBigramLoadRes(
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LOCRUN_INFO *pLocRunInfo,
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CLASS_BIGRAM_INFO *pBigramInfo,
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HINSTANCE hInst,
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int nResID,
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int nType
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);
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// Load runtime localization information from an image already loaded into
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// memory.
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BOOL ClassBigramLoadPointer(LOCRUN_INFO *pLocRunInfo, CLASS_BIGRAM_INFO *pBigramInfo, void *pData);
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// Get class bigram probability for selected characters. Characters must be passed in as
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// dense coded values.
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FLOAT ClassBigramTransitionCost(
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LOCRUN_INFO *pLocRunInfo,
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CLASS_BIGRAM_INFO *pBigramInfo,
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wchar_t dchPrev,
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wchar_t dchCur
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);
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/************************************************************************************************\
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* Stuff to access binary class bigram file, only used by common and clbigram.
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\************************************************************************************************/
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// The format for the class bigram file is:
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// Header:
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// DWORD File type indicator.
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// DWORD Size of header.
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// BYTE Lowest version this code that can read this file.
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// BYTE Version of this code that wrote this file.
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// wchar_t[4] Locale ID (3 characters plus null).
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// DWORD * 3 Locale signature
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// WORD Number of classes.
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// DWORD[3] reserved
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// Prop table 0:
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// BYTE Prob of Trans between class 0 and to class 0.
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// BYTE Prob of Trans between class 0 and to class 1.
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// .
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// .
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// .
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// BYTE Prob of Trans between class 0 and to class N-1.
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// Prop table 1:
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// BYTE Prob of Trans between class 1 and to class 0.
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// BYTE Prob of Trans between class 1 and to class 1.
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// .
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// .
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// .
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// BYTE Prob of Trans between class 1 and to class N-1.// WORD Index to second table for first class code.
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// .
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// .
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// .
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// Prop table N-1:
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// BYTE Prob of Trans between class N-1 and to class 0.
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// BYTE Prob of Trans between class N-1 and to class 1.
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// .
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// .
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// .
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// BYTE Prob of Trans between class N-1 and to class N-1.// WORD Index to second table for first class code.
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// .
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// .
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// .
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//
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// Constants
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//
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// Magic key the identifies the Local Runtime files
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#define CLASS_BIGRAM_FILE_TYPE 0x7A30C362
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// Version information for file.
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#define CLASS_BIGRAM_MIN_FILE_VERSION 1 // First version of code that can read this file
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#define CLASS_BIGRAM_CUR_FILE_VERSION 1 // Current version of code.
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#define CLASS_BIGRAM_OLD_FILE_VERSION 0 // Oldest file version this code can read.
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// Probability to use if no bigram entry found.
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#define CLASS_BIGRAM_DEFAULT_PROB 255 // JRB: Figure a good value for this ???
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//
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// Structures and types
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//
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// Structure to hold file header.
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typedef struct tagCLASS_BIGRAM_HEADER {
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DWORD fileType; // This should always be set to BIGRAM_FILE_TYPE.
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DWORD headerSize; // Size of the header.
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BYTE minFileVer; // Earliest version of code that can read this file
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BYTE curFileVer; // Current version of code that wrote the file.
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wchar_t locale[4]; // Locale ID string.
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DWORD adwSignature [3]; // Locale signature
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WORD cNumClasses; // Number of classes
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DWORD reserved [3]; // reserved
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} CLASS_BIGRAM_HEADER;
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//
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// Functions
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//
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#ifdef __cplusplus
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}
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#endif
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#endif //__CLASSBIGRAM__
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