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+/*
+******************************************************************************
+*
+* Copyright (C) 1999-2011, International Business Machines
+* Corporation and others. All Rights Reserved.
+*
+******************************************************************************/
+
+
+/*----------------------------------------------------------------------------------
+ *
+ * UCommonData An abstract interface for dealing with ICU Common Data Files.
+ * ICU Common Data Files are a grouping of a number of individual
+ * data items (resources, converters, tables, anything) into a
+ * single file or dll. The combined format includes a table of
+ * contents for locating the individual items by name.
+ *
+ * Two formats for the table of contents are supported, which is
+ * why there is an abstract inteface involved.
+ *
+ * These functions are part of the ICU internal implementation, and
+ * are not inteded to be used directly by applications.
+ */
+
+#ifndef __UCMNDATA_H__
+#define __UCMNDATA_H__
+
+#include "unicode/udata.h"
+#include "umapfile.h"
+
+
+#define COMMON_DATA_NAME U_ICUDATA_NAME
+
+typedef struct {
+ uint16_t headerSize;
+ uint8_t magic1;
+ uint8_t magic2;
+} MappedData;
+
+
+typedef struct {
+ MappedData dataHeader;
+ UDataInfo info;
+} DataHeader;
+
+typedef struct {
+ uint32_t nameOffset;
+ uint32_t dataOffset;
+} UDataOffsetTOCEntry;
+
+typedef struct {
+ uint32_t count;
+ UDataOffsetTOCEntry entry[2]; /* Actual size of array is from count. */
+} UDataOffsetTOC;
+
+/**
+ * Get the header size from a const DataHeader *udh.
+ * Handles opposite-endian data.
+ *
+ * @internal
+ */
+U_CFUNC uint16_t
+udata_getHeaderSize(const DataHeader *udh);
+
+/**
+ * Get the UDataInfo.size from a const UDataInfo *info.
+ * Handles opposite-endian data.
+ *
+ * @internal
+ */
+U_CFUNC uint16_t
+udata_getInfoSize(const UDataInfo *info);
+
+U_CDECL_BEGIN
+/*
+ * "Virtual" functions for data lookup.
+ * To call one, given a UDataMemory *p, the code looks like this:
+ * p->vFuncs.Lookup(p, tocEntryName, pErrorCode);
+ * (I sure do wish this was written in C++, not C)
+ */
+
+typedef const DataHeader *
+(U_CALLCONV * LookupFn)(const UDataMemory *pData,
+ const char *tocEntryName,
+ int32_t *pLength,
+ UErrorCode *pErrorCode);
+
+typedef uint32_t
+(U_CALLCONV * NumEntriesFn)(const UDataMemory *pData);
+
+U_CDECL_END
+
+typedef struct {
+ LookupFn Lookup;
+ NumEntriesFn NumEntries;
+} commonDataFuncs;
+
+
+/*
+ * Functions to check whether a UDataMemory refers to memory containing
+ * a recognizable header and table of contents a Common Data Format
+ *
+ * If a valid header and TOC are found,
+ * set the CommonDataFuncs function dispatch vector in the UDataMemory
+ * to point to the right functions for the TOC type.
+ * otherwise
+ * set an errorcode.
+ */
+U_CFUNC void udata_checkCommonData(UDataMemory *pData, UErrorCode *pErrorCode);
+
+#endif