182 lines
7.4 KiB
C
182 lines
7.4 KiB
C
/*
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******************************************************************************
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* *
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* Copyright (C) 1999-2002, 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: uresdata.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: 1999dec08
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* created by: Markus W. Scherer
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* 06/24/02 weiv Added support for resource sharing
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*/
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#ifndef __RESDATA_H__
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#define __RESDATA_H__
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#include "unicode/utypes.h"
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#include "unicode/udata.h"
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/*
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* A Resource is a 32-bit value that has 2 bit fields:
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* 31..28 4-bit type, see enum below
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* 27..0 28-bit four-byte-offset or value according to the type
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*/
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typedef uint32_t Resource;
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#define RES_BOGUS 0xffffffff
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#define RES_GET_TYPE(res) ((res)>>28UL)
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#define RES_GET_OFFSET(res) ((res)&0x0fffffff)
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#define RES_GET_POINTER(pRoot, res) ((pRoot)+RES_GET_OFFSET(res))
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/* get signed and unsigned integer values directly from the Resource handle */
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#define RES_GET_INT(res) (((int32_t)((res)<<4L))>>4L)
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#define RES_GET_UINT(res) ((res)&0x0fffffff)
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/*
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* File format for .res resource bundle files (formatVersion=1)
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*
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* An ICU4C resource bundle file (.res) is a binary, memory-mappable file
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* with nested, hierarchical data structures.
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* It physically contains the following:
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*
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* Resource root; -- 32-bit Resource item, root item for this bundle's tree;
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* currently, the root item must be a table resource item
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* char keys[]; -- up to 65k of characters for key strings,
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* which consist of invariant characters (ASCII/EBCDIC) and are NUL-terminated;
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* padded to multiple of 4 bytes for 4-alignment of the following data
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* data; -- data directly and indirectly indexed by the root item;
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* the structure is determined by walking the tree
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*
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* Each resource bundle item has a 32-bit Resource handle (see typedef above)
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* which contains the item type number in its upper 4 bits (31..28) and either
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* an offset or a direct value in its lower 28 bits (27..0).
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* The order of items is undefined and only determined by walking the tree.
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* Leaves of the tree may be stored first or last or anywhere in between,
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* and it is in theory possible to have unreferenced holes in the file.
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*
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* Direct values:
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* - Empty Unicode strings have an offset value of 0 in the Resource handle itself.
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* - Integer values are 28-bit values stored in the Resource handle itself;
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* the interpretation of unsigned vs. signed integers is up to the application.
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*
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* All other types and values use 28-bit offsets to point to the item's data.
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* The offset is an index to the first 32-bit word of the value, relative to the
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* start of the resource data (i.e., the root item handle is at offset 0).
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* To get byte offsets, the offset is multiplied by 4 (or shifted left by 2 bits).
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* All resource item values are 4-aligned.
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*
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* The structures (memory layouts) for the values for each item type are listed
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* in the table above.
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*
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* Nested, hierarchical structures: -------------
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*
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* Table items contain key-value pairs where the keys are 16-bit offsets to char * key strings.
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* Key string offsets are also relative to the start of the resource data (of the root handle),
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* i.e., the first string has an offset of 4 (after the 4-byte root handle).
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*
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* The values of these pairs are Resource handles.
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*
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* Array items are simple vectors of Resource handles.
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*
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* An alias item is special (and new in ICU 2.4): --------------
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*
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* Its memory layout is just like for a UnicodeString, but at runtime it resolves to
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* another resource bundle's item according to the path in the string.
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* This is used to share items across bundles that are in different lookup/fallback
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* chains (e.g., large collation data among zh_TW and zh_HK).
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* This saves space (for large items) and maintenance effort (less duplication of data).
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*
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* --------------------------------------------------------------------------
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*
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* Resource types:
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*
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* Most resources have their values stored at four-byte offsets from the start
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* of the resource data. These values are at least 4-aligned.
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* Some resource values are stored directly in the offset field of the Resource itself.
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* See UResType in unicode/ures.h for enumeration constants for Resource types.
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*
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* Type Name Memory layout of values
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* (in parentheses: scalar, non-offset values)
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*
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* 0 Unicode String: int32_t length, UChar[length], (UChar)0, (padding)
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* or (empty string ("") if offset==0)
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* 1 Binary: int32_t length, uint8_t[length], (padding)
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* - this value should be 32-aligned -
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* 2 Table: uint16_t count, uint16_t keyStringOffsets[count], (uint16_t padding), Resource[count]
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* 3 Alias: (physically same value layout as string, new in ICU 2.4)
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*
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* 7 Integer: (28-bit offset is integer value)
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* 8 Array: int32_t count, Resource[count]
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*
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* 14 Integer Vector: int32_t length, int32_t[length]
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* 15 Reserved: This value denotes special purpose resources and is for internal use.
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*
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* Note that there are 3 types with data vector values:
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* - Vectors of 8-bit bytes stored as type Binary.
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* - Vectors of 16-bit words stored as type Unicode String
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* (no value restrictions, all values 0..ffff allowed!).
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* - Vectors of 32-bit words stored as type Integer Vector.
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*/
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/*
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* Structure for a single, memory-mapped ResourceBundle.
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*/
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typedef struct {
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UDataMemory *data;
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Resource *pRoot;
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Resource rootRes;
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} ResourceData;
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/*
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* Load a resource bundle file.
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* The ResourceData structure must be allocated externally.
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*/
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U_CFUNC UBool
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res_load(ResourceData *pResData,
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const char *path, const char *name, UErrorCode *errorCode);
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/*
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* Release a resource bundle file.
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* This does not release the ResourceData structure itself.
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*/
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U_CFUNC void
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res_unload(ResourceData *pResData);
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/*
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* Return a pointer to a zero-terminated, const UChar* string
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* and set its length in *pLength.
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* Returns NULL if not found.
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*/
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U_CFUNC const UChar *
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res_getString(const ResourceData *pResData, const Resource res, int32_t *pLength);
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U_CFUNC const UChar *
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res_getAlias(const ResourceData *pResData, const Resource res, int32_t *pLength);
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U_CFUNC const uint8_t *
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res_getBinary(const ResourceData *pResData, const Resource res, int32_t *pLength);
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U_CFUNC const int32_t *
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res_getIntVector(const ResourceData *pResData, const Resource res, int32_t *pLength);
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U_CFUNC Resource
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res_getResource(const ResourceData *pResData, const char *key);
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U_CFUNC int32_t
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res_countArrayItems(const ResourceData *pResData, const Resource res);
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U_CFUNC int32_t res_getTableSize(const ResourceData *pResData, Resource table);
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U_CFUNC Resource res_getArrayItem(const ResourceData *pResData, Resource array, const int32_t indexS);
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U_CFUNC Resource res_getTableItemByIndex(const ResourceData *pResData, Resource table, int32_t indexS, const char ** key);
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U_CFUNC Resource res_getTableItemByKey(const ResourceData *pResData, Resource table, int32_t *indexS, const char* * key);
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U_CFUNC Resource res_findResource(const ResourceData *pResData, Resource r, const char** path, const char** key);
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#endif
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