1// © 2016 and later: Unicode, Inc. and others.
2// License & terms of use: http://www.unicode.org/copyright.html
3/*
4******************************************************************************
5*
6* Copyright (C) 1999-2011, International Business Machines
7* Corporation and others. All Rights Reserved.
8*
9******************************************************************************/
10
11
12/*----------------------------------------------------------------------------------
13 *
14 * UCommonData An abstract interface for dealing with ICU Common Data Files.
15 * ICU Common Data Files are a grouping of a number of individual
16 * data items (resources, converters, tables, anything) into a
17 * single file or dll. The combined format includes a table of
18 * contents for locating the individual items by name.
19 *
20 * Two formats for the table of contents are supported, which is
21 * why there is an abstract interface involved.
22 *
23 * These functions are part of the ICU internal implementation, and
24 * are not intended to be used directly by applications.
25 */
26
27#ifndef __UCMNDATA_H__
28#define __UCMNDATA_H__
29
30#include "unicode/udata.h"
31#include "umapfile.h"
32
33
34#define COMMON_DATA_NAME U_ICUDATA_NAME
35
36typedef struct {
37 uint16_t headerSize;
38 uint8_t magic1;
39 uint8_t magic2;
40} MappedData;
41
42
43typedef struct {
44 MappedData dataHeader;
45 UDataInfo info;
46} DataHeader;
47
48typedef struct {
49 uint32_t nameOffset;
50 uint32_t dataOffset;
51} UDataOffsetTOCEntry;
52
53typedef struct {
54 uint32_t count;
55 /**
56 * Variable-length array declared with length 1 to disable bounds checkers.
57 * The actual array length is in the count field.
58 */
59 UDataOffsetTOCEntry entry[1];
60} UDataOffsetTOC;
61
62/**
63 * Get the header size from a const DataHeader *udh.
64 * Handles opposite-endian data.
65 *
66 * @internal
67 */
68U_CFUNC uint16_t
69udata_getHeaderSize(const DataHeader *udh);
70
71/**
72 * Get the UDataInfo.size from a const UDataInfo *info.
73 * Handles opposite-endian data.
74 *
75 * @internal
76 */
77U_CFUNC uint16_t
78udata_getInfoSize(const UDataInfo *info);
79
80U_CDECL_BEGIN
81/*
82 * "Virtual" functions for data lookup.
83 * To call one, given a UDataMemory *p, the code looks like this:
84 * p->vFuncs.Lookup(p, tocEntryName, pErrorCode);
85 * (I sure do wish this was written in C++, not C)
86 */
87
88typedef const DataHeader *
89(U_CALLCONV * LookupFn)(const UDataMemory *pData,
90 const char *tocEntryName,
91 int32_t *pLength,
92 UErrorCode *pErrorCode);
93
94typedef uint32_t
95(U_CALLCONV * NumEntriesFn)(const UDataMemory *pData);
96
97U_CDECL_END
98
99typedef struct {
100 LookupFn Lookup;
101 NumEntriesFn NumEntries;
102} commonDataFuncs;
103
104
105/*
106 * Functions to check whether a UDataMemory refers to memory containing
107 * a recognizable header and table of contents a Common Data Format
108 *
109 * If a valid header and TOC are found,
110 * set the CommonDataFuncs function dispatch vector in the UDataMemory
111 * to point to the right functions for the TOC type.
112 * otherwise
113 * set an errorcode.
114 */
115U_CFUNC void udata_checkCommonData(UDataMemory *pData, UErrorCode *pErrorCode);
116
117#endif
118