110 lines
2.9 KiB
C
110 lines
2.9 KiB
C
/*
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******************************************************************************
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*
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* Copyright (C) 1999-2003, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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******************************************************************************/
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/*----------------------------------------------------------------------------------
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*
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* UCommonData An abstract interface for dealing with ICU Common Data Files.
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* ICU Common Data Files are a grouping of a number of individual
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* data items (resources, converters, tables, anything) into a
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* single file or dll. The combined format includes a table of
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* contents for locating the individual items by name.
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*
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* Two formats for the table of contents are supported, which is
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* why there is an abstract inteface involved.
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*
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* These functions are part of the ICU internal implementation, and
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* are not inteded to be used directly by applications.
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*/
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#ifndef __UCMNDATA_H__
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#define __UCMNDATA_H__
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#include "unicode/udata.h"
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#include "umapfile.h"
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#define COMMON_DATA_NAME U_ICUDATA_NAME
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typedef struct {
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uint16_t headerSize;
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uint8_t magic1;
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uint8_t magic2;
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} MappedData;
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typedef struct {
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MappedData dataHeader;
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UDataInfo info;
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} DataHeader;
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typedef struct {
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uint32_t nameOffset;
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uint32_t dataOffset;
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} UDataOffsetTOCEntry;
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typedef struct {
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uint32_t count;
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UDataOffsetTOCEntry entry[2]; /* Actual size of array is from count. */
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} UDataOffsetTOC;
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/**
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* Get the header size from a const DataHeader *udh.
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* Handles opposite-endian data.
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*
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* @internal
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*/
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U_CFUNC uint16_t
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udata_getHeaderSize(const DataHeader *udh);
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/**
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* Get the UDataInfo.size from a const UDataInfo *info.
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* Handles opposite-endian data.
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*
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* @internal
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*/
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U_CFUNC uint16_t
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udata_getInfoSize(const UDataInfo *info);
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/*
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* "Virtual" functions for data lookup.
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* To call one, given a UDataMemory *p, the code looks like this:
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* p->vFuncs.Lookup(p, tocEntryName, pErrorCode);
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* (I sure do wish this was written in C++, not C)
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*/
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typedef const DataHeader *
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(* LookupFn)(const UDataMemory *pData,
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const char *tocEntryName,
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int32_t *pLength,
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UErrorCode *pErrorCode);
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typedef uint32_t
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(* NumEntriesFn)(const UDataMemory *pData);
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typedef struct {
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LookupFn Lookup;
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NumEntriesFn NumEntries;
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} commonDataFuncs;
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/*
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* Functions to check whether a UDataMemory refers to memory containing
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* a recognizable header and table of contents a Common Data Format
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*
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* If a valid header and TOC are found,
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* set the CommonDataFuncs function dispatch vector in the UDataMemory
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* to point to the right functions for the TOC type.
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* otherwise
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* set an errorcode.
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*/
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void udata_checkCommonData(UDataMemory *pData, UErrorCode *pErrorCode);
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#endif
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