1 /* 2 ****************************************************************************** 3 * 4 * Copyright (C) 1999-2003, International Business Machines 5 * Corporation and others. All Rights Reserved. 6 * 7 ******************************************************************************/ 8 9 10 /*---------------------------------------------------------------------------------- 11 * 12 * UCommonData An abstract interface for dealing with ICU Common Data Files. 13 * ICU Common Data Files are a grouping of a number of individual 14 * data items (resources, converters, tables, anything) into a 15 * single file or dll. The combined format includes a table of 16 * contents for locating the individual items by name. 17 * 18 * Two formats for the table of contents are supported, which is 19 * why there is an abstract inteface involved. 20 * 21 * These functions are part of the ICU internal implementation, and 22 * are not inteded to be used directly by applications. 23 */ 24 25 #ifndef __UCMNDATA_H__ 26 #define __UCMNDATA_H__ 27 28 #include "unicode/udata.h" 29 #include "umapfile.h" 30 31 32 #define COMMON_DATA_NAME U_ICUDATA_NAME 33 34 typedef struct { 35 uint16_t headerSize; 36 uint8_t magic1; 37 uint8_t magic2; 38 } MappedData; 39 40 41 typedef struct { 42 MappedData dataHeader; 43 UDataInfo info; 44 } DataHeader; 45 46 typedef struct { 47 uint32_t nameOffset; 48 uint32_t dataOffset; 49 } UDataOffsetTOCEntry; 50 51 typedef struct { 52 uint32_t count; 53 UDataOffsetTOCEntry entry[2]; /* Actual size of array is from count. */ 54 } UDataOffsetTOC; 55 56 /** 57 * Get the header size from a const DataHeader *udh. 58 * Handles opposite-endian data. 59 * 60 * @internal 61 */ 62 U_CFUNC uint16_t 63 udata_getHeaderSize(const DataHeader *udh); 64 65 /** 66 * Get the UDataInfo.size from a const UDataInfo *info. 67 * Handles opposite-endian data. 68 * 69 * @internal 70 */ 71 U_CFUNC uint16_t 72 udata_getInfoSize(const UDataInfo *info); 73 74 /* 75 * "Virtual" functions for data lookup. 76 * To call one, given a UDataMemory *p, the code looks like this: 77 * p->vFuncs.Lookup(p, tocEntryName, pErrorCode); 78 * (I sure do wish this was written in C++, not C) 79 */ 80 81 typedef const DataHeader * 82 (* LookupFn)(const UDataMemory *pData, 83 const char *tocEntryName, 84 int32_t *pLength, 85 UErrorCode *pErrorCode); 86 87 typedef uint32_t 88 (* NumEntriesFn)(const UDataMemory *pData); 89 90 typedef struct { 91 LookupFn Lookup; 92 NumEntriesFn NumEntries; 93 } commonDataFuncs; 94 95 96 /* 97 * Functions to check whether a UDataMemory refers to memory containing 98 * a recognizable header and table of contents a Common Data Format 99 * 100 * If a valid header and TOC are found, 101 * set the CommonDataFuncs function dispatch vector in the UDataMemory 102 * to point to the right functions for the TOC type. 103 * otherwise 104 * set an errorcode. 105 */ 106 void udata_checkCommonData(UDataMemory *pData, UErrorCode *pErrorCode); 107 108 109 #endif 110