417 lines
15 KiB
C
417 lines
15 KiB
C
/*
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******************************************************************************
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*
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* Copyright (C) 1999-2012, 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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* file name: udata.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 1999oct25
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* created by: Markus W. Scherer
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*/
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#ifndef __UDATA_H__
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#define __UDATA_H__
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#include "unicode/utypes.h"
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#include "unicode/localpointer.h"
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U_CDECL_BEGIN
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/**
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* \file
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* \brief C API: Data loading interface
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*
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* <h2>Information about data loading interface</h2>
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*
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* This API is used to find and efficiently load data for ICU and applications
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* using ICU. It provides an abstract interface that specifies a data type and
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* name to find and load the data. Normally this API is used by other ICU APIs
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* to load required data out of the ICU data library, but it can be used to
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* load data out of other places.
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*
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* See the User Guide Data Management chapter.
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*/
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#ifndef U_HIDE_INTERNAL_API
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/**
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* Character used to separate package names from tree names
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* @internal ICU 3.0
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*/
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#define U_TREE_SEPARATOR '-'
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/**
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* String used to separate package names from tree names
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* @internal ICU 3.0
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*/
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#define U_TREE_SEPARATOR_STRING "-"
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/**
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* Character used to separate parts of entry names
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* @internal ICU 3.0
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*/
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#define U_TREE_ENTRY_SEP_CHAR '/'
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/**
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* String used to separate parts of entry names
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* @internal ICU 3.0
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*/
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#define U_TREE_ENTRY_SEP_STRING "/"
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/**
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* Alias for standard ICU data
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* @internal ICU 3.0
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*/
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#define U_ICUDATA_ALIAS "ICUDATA"
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#endif /* U_HIDE_INTERNAL_API */
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/**
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* UDataInfo contains the properties about the requested data.
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* This is meta data.
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*
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* <p>This structure may grow in the future, indicated by the
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* <code>size</code> field.</p>
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*
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* <p>The platform data property fields help determine if a data
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* file can be efficiently used on a given machine.
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* The particular fields are of importance only if the data
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* is affected by the properties - if there is integer data
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* with word sizes > 1 byte, char* text, or UChar* text.</p>
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*
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* <p>The implementation for the <code>udata_open[Choice]()</code>
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* functions may reject data based on the value in <code>isBigEndian</code>.
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* No other field is used by the <code>udata</code> API implementation.</p>
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*
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* <p>The <code>dataFormat</code> may be used to identify
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* the kind of data, e.g. a converter table.</p>
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*
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* <p>The <code>formatVersion</code> field should be used to
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* make sure that the format can be interpreted.
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* I may be a good idea to check only for the one or two highest
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* of the version elements to allow the data memory to
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* get more or somewhat rearranged contents, for as long
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* as the using code can still interpret the older contents.</p>
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*
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* <p>The <code>dataVersion</code> field is intended to be a
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* common place to store the source version of the data;
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* for data from the Unicode character database, this could
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* reflect the Unicode version.</p>
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* @stable ICU 2.0
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*/
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typedef struct {
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/** sizeof(UDataInfo)
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* @stable ICU 2.0 */
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uint16_t size;
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/** unused, set to 0
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* @stable ICU 2.0*/
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uint16_t reservedWord;
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/* platform data properties */
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/** 0 for little-endian machine, 1 for big-endian
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* @stable ICU 2.0 */
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uint8_t isBigEndian;
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/** see U_CHARSET_FAMILY values in utypes.h
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* @stable ICU 2.0*/
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uint8_t charsetFamily;
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/** sizeof(UChar), one of { 1, 2, 4 }
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* @stable ICU 2.0*/
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uint8_t sizeofUChar;
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/** unused, set to 0
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* @stable ICU 2.0*/
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uint8_t reservedByte;
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/** data format identifier
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* @stable ICU 2.0*/
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uint8_t dataFormat[4];
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/** versions: [0] major [1] minor [2] milli [3] micro
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* @stable ICU 2.0*/
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uint8_t formatVersion[4];
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/** versions: [0] major [1] minor [2] milli [3] micro
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* @stable ICU 2.0*/
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uint8_t dataVersion[4];
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} UDataInfo;
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/* API for reading data -----------------------------------------------------*/
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/**
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* Forward declaration of the data memory type.
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* @stable ICU 2.0
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*/
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typedef struct UDataMemory UDataMemory;
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/**
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* Callback function for udata_openChoice().
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* @param context parameter passed into <code>udata_openChoice()</code>.
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* @param type The type of the data as passed into <code>udata_openChoice()</code>.
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* It may be <code>NULL</code>.
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* @param name The name of the data as passed into <code>udata_openChoice()</code>.
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* @param pInfo A pointer to the <code>UDataInfo</code> structure
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* of data that has been loaded and will be returned
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* by <code>udata_openChoice()</code> if this function
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* returns <code>TRUE</code>.
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* @return TRUE if the current data memory is acceptable
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* @stable ICU 2.0
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*/
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typedef UBool U_CALLCONV
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UDataMemoryIsAcceptable(void *context,
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const char *type, const char *name,
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const UDataInfo *pInfo);
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/**
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* Convenience function.
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* This function works the same as <code>udata_openChoice</code>
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* except that any data that matches the type and name
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* is assumed to be acceptable.
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* @param path Specifies an absolute path and/or a basename for the
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* finding of the data in the file system.
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* <code>NULL</code> for ICU data.
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* @param type A string that specifies the type of data to be loaded.
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* For example, resource bundles are loaded with type "res",
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* conversion tables with type "cnv".
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* This may be <code>NULL</code> or empty.
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* @param name A string that specifies the name of the data.
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* @param pErrorCode An ICU UErrorCode parameter. It must not be <code>NULL</code>.
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* @return A pointer (handle) to a data memory object, or <code>NULL</code>
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* if an error occurs. Call <code>udata_getMemory()</code>
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* to get a pointer to the actual data.
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*
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* @see udata_openChoice
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* @stable ICU 2.0
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*/
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U_STABLE UDataMemory * U_EXPORT2
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udata_open(const char *path, const char *type, const char *name,
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UErrorCode *pErrorCode);
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/**
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* Data loading function.
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* This function is used to find and load efficiently data for
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* ICU and applications using ICU.
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* It provides an abstract interface that allows to specify a data
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* type and name to find and load the data.
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*
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* <p>The implementation depends on platform properties and user preferences
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* and may involve loading shared libraries (DLLs), mapping
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* files into memory, or fopen()/fread() files.
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* It may also involve using static memory or database queries etc.
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* Several or all data items may be combined into one entity
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* (DLL, memory-mappable file).</p>
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*
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* <p>The data is always preceded by a header that includes
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* a <code>UDataInfo</code> structure.
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* The caller's <code>isAcceptable()</code> function is called to make
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* sure that the data is useful. It may be called several times if it
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* rejects the data and there is more than one location with data
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* matching the type and name.</p>
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*
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* <p>If <code>path==NULL</code>, then ICU data is loaded.
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* Otherwise, it is separated into a basename and a basename-less directory string.
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* The basename is used as the data package name, and the directory is
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* logically prepended to the ICU data directory string.</p>
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*
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* <p>For details about ICU data loading see the User Guide
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* Data Management chapter. (http://icu-project.org/userguide/icudata.html)</p>
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*
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* @param path Specifies an absolute path and/or a basename for the
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* finding of the data in the file system.
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* <code>NULL</code> for ICU data.
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* @param type A string that specifies the type of data to be loaded.
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* For example, resource bundles are loaded with type "res",
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* conversion tables with type "cnv".
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* This may be <code>NULL</code> or empty.
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* @param name A string that specifies the name of the data.
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* @param isAcceptable This function is called to verify that loaded data
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* is useful for the client code. If it returns FALSE
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* for all data items, then <code>udata_openChoice()</code>
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* will return with an error.
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* @param context Arbitrary parameter to be passed into isAcceptable.
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* @param pErrorCode An ICU UErrorCode parameter. It must not be <code>NULL</code>.
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* @return A pointer (handle) to a data memory object, or <code>NULL</code>
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* if an error occurs. Call <code>udata_getMemory()</code>
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* to get a pointer to the actual data.
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* @stable ICU 2.0
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*/
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U_STABLE UDataMemory * U_EXPORT2
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udata_openChoice(const char *path, const char *type, const char *name,
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UDataMemoryIsAcceptable *isAcceptable, void *context,
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UErrorCode *pErrorCode);
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/**
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* Close the data memory.
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* This function must be called to allow the system to
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* release resources associated with this data memory.
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* @param pData The pointer to data memory object
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* @stable ICU 2.0
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*/
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U_STABLE void U_EXPORT2
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udata_close(UDataMemory *pData);
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#if U_SHOW_CPLUSPLUS_API
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U_NAMESPACE_BEGIN
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/**
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* \class LocalUDataMemoryPointer
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* "Smart pointer" class, closes a UDataMemory via udata_close().
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* For most methods see the LocalPointerBase base class.
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*
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* @see LocalPointerBase
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* @see LocalPointer
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* @stable ICU 4.4
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*/
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U_DEFINE_LOCAL_OPEN_POINTER(LocalUDataMemoryPointer, UDataMemory, udata_close);
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U_NAMESPACE_END
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#endif
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/**
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* Get the pointer to the actual data inside the data memory.
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* The data is read-only.
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* @param pData The pointer to data memory object
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* @stable ICU 2.0
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*/
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U_STABLE const void * U_EXPORT2
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udata_getMemory(UDataMemory *pData);
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/**
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* Get the information from the data memory header.
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* This allows to get access to the header containing
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* platform data properties etc. which is not part of
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* the data itself and can therefore not be accessed
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* via the pointer that <code>udata_getMemory()</code> returns.
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*
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* @param pData pointer to the data memory object
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* @param pInfo pointer to a UDataInfo object;
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* its <code>size</code> field must be set correctly,
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* typically to <code>sizeof(UDataInfo)</code>.
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*
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* <code>*pInfo</code> will be filled with the UDataInfo structure
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* in the data memory object. If this structure is smaller than
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* <code>pInfo->size</code>, then the <code>size</code> will be
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* adjusted and only part of the structure will be filled.
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* @stable ICU 2.0
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*/
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U_STABLE void U_EXPORT2
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udata_getInfo(UDataMemory *pData, UDataInfo *pInfo);
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/**
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* This function bypasses the normal ICU data loading process and
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* allows you to force ICU's system data to come out of a user-specified
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* area in memory.
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*
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* The format of this data is that of the icu common data file, as is
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* generated by the pkgdata tool with mode=common or mode=dll.
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* You can read in a whole common mode file and pass the address to the start of the
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* data, or (with the appropriate link options) pass in the pointer to
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* the data that has been loaded from a dll by the operating system,
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* as shown in this code:
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*
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* extern const char U_IMPORT U_ICUDATA_ENTRY_POINT [];
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* // U_ICUDATA_ENTRY_POINT is same as entry point specified to pkgdata tool
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* UErrorCode status = U_ZERO_ERROR;
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*
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* udata_setCommonData(&U_ICUDATA_ENTRY_POINT, &status);
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*
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* It is important that the declaration be as above. The entry point
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* must not be declared as an extern void*.
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*
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* Starting with ICU 4.4, it is possible to set several data packages,
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* one per call to this function.
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* udata_open() will look for data in the multiple data packages in the order
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* in which they were set.
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* The position of the linked-in or default-name ICU .data package in the
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* search list depends on when the first data item is loaded that is not contained
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* in the already explicitly set packages.
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* If data was loaded implicitly before the first call to this function
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* (for example, via opening a converter, constructing a UnicodeString
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* from default-codepage data, using formatting or collation APIs, etc.),
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* then the default data will be first in the list.
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*
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* This function has no effect on application (non ICU) data. See udata_setAppData()
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* for similar functionality for application data.
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*
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* @param data pointer to ICU common data
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* @param err outgoing error status <code>U_USING_DEFAULT_WARNING, U_UNSUPPORTED_ERROR</code>
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* @stable ICU 2.0
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*/
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U_STABLE void U_EXPORT2
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udata_setCommonData(const void *data, UErrorCode *err);
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/**
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* This function bypasses the normal ICU data loading process for application-specific
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* data and allows you to force the it to come out of a user-specified
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* pointer.
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*
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* The format of this data is that of the icu common data file, like 'icudt26l.dat'
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* or the corresponding shared library (DLL) file.
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* The application must read in or otherwise construct an image of the data and then
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* pass the address of it to this function.
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*
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*
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* Warning: setAppData will set a U_USING_DEFAULT_WARNING code if
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* data with the specifed path that has already been opened, or
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* if setAppData with the same path has already been called.
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* Any such calls to setAppData will have no effect.
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*
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*
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* @param packageName the package name by which the application will refer
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* to (open) this data
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* @param data pointer to the data
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* @param err outgoing error status <code>U_USING_DEFAULT_WARNING, U_UNSUPPORTED_ERROR</code>
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* @see udata_setCommonData
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* @stable ICU 2.0
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*/
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U_STABLE void U_EXPORT2
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udata_setAppData(const char *packageName, const void *data, UErrorCode *err);
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/**
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* Possible settings for udata_setFileAccess()
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* @see udata_setFileAccess
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* @stable ICU 3.4
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*/
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typedef enum UDataFileAccess {
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/** ICU looks for data in single files first, then in packages. (default) @stable ICU 3.4 */
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UDATA_FILES_FIRST,
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/** An alias for the default access mode. @stable ICU 3.4 */
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UDATA_DEFAULT_ACCESS = UDATA_FILES_FIRST,
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/** ICU only loads data from packages, not from single files. @stable ICU 3.4 */
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UDATA_ONLY_PACKAGES,
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/** ICU loads data from packages first, and only from single files
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if the data cannot be found in a package. @stable ICU 3.4 */
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UDATA_PACKAGES_FIRST,
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/** ICU does not access the file system for data loading. @stable ICU 3.4 */
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UDATA_NO_FILES,
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/** Number of real UDataFileAccess values. @stable ICU 3.4 */
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UDATA_FILE_ACCESS_COUNT
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} UDataFileAccess;
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/**
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* This function may be called to control how ICU loads data. It must be called
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* before any ICU data is loaded, including application data loaded with
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* ures/ResourceBundle or udata APIs. This function is not multithread safe.
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* The results of calling it while other threads are loading data are undefined.
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* @param access The type of file access to be used
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* @param status Error code.
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* @see UDataFileAccess
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* @stable ICU 3.4
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*/
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U_STABLE void U_EXPORT2
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udata_setFileAccess(UDataFileAccess access, UErrorCode *status);
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U_CDECL_END
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#endif
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