394 lines
17 KiB
C
394 lines
17 KiB
C
/*
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******************************************************************************
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* *
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* Copyright (C) 1999-2009, 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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#include "unicode/ures.h"
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#include "udataswp.h"
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/**
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* Numeric constants for internal-only types of resource items.
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* These must use different numeric values than UResType constants
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* because they are used together.
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* Internal types are never returned by ures_getType().
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*/
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typedef enum {
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/** Include a negative value so that the compiler uses the same int type as for UResType. */
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URES_INTERNAL_NONE=-1,
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/** Resource type constant for tables with 32-bit count, key offsets and values. */
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URES_TABLE32=4,
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/**
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* Resource type constant for tables with 16-bit count, key offsets and values.
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* All values are URES_STRING_V2 strings.
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*/
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URES_TABLE16=5,
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/** Resource type constant for 16-bit Unicode strings in formatVersion 2. */
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URES_STRING_V2=6,
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/**
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* Resource type constant for arrays with 16-bit count and values.
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* All values are URES_STRING_V2 strings.
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*/
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URES_ARRAY16=9
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} UResInternalType;
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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) ((UResType)((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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#define URES_IS_ARRAY(type) ((type)==URES_ARRAY || (type)==URES_ARRAY16)
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#define URES_IS_TABLE(type) ((type)==URES_TABLE || (type)==URES_TABLE16 || (type)==URES_TABLE32)
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#define URES_IS_CONTAINER(type) (URES_IS_TABLE(type) || URES_IS_ARRAY(type))
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#define URES_MAKE_RESOURCE(type, offset) (((Resource)(type)<<28)|(Resource)(offset))
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#define URES_MAKE_EMPTY_RESOURCE(type) ((Resource)(type)<<28)
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/* indexes[] value names; indexes are generally 32-bit (Resource) indexes */
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enum {
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URES_INDEX_LENGTH, /* [0] contains URES_INDEX_TOP==the length of indexes[];
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* formatVersion==1: all bits contain the length of indexes[]
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* but the length is much less than 0xff;
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* formatVersion>1:
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* only bits 7..0 contain the length of indexes[],
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* bits 31..8 are reserved and set to 0 */
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URES_INDEX_KEYS_TOP, /* [1] contains the top of the key strings, */
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/* same as the bottom of resources or UTF-16 strings, rounded up */
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URES_INDEX_RESOURCES_TOP, /* [2] contains the top of all resources */
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URES_INDEX_BUNDLE_TOP, /* [3] contains the top of the bundle, */
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/* in case it were ever different from [2] */
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URES_INDEX_MAX_TABLE_LENGTH,/* [4] max. length of any table */
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URES_INDEX_ATTRIBUTES, /* [5] attributes bit set, see URES_ATT_* (new in formatVersion 1.2) */
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URES_INDEX_16BIT_TOP, /* [6] top of the 16-bit units (UTF-16 string v2 UChars, URES_TABLE16, URES_ARRAY16),
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* rounded up (new in formatVersion 2.0, ICU 4.4) */
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URES_INDEX_POOL_CHECKSUM, /* [7] checksum of the pool bundle (new in formatVersion 2.0, ICU 4.4) */
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URES_INDEX_TOP
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};
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/*
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* Nofallback attribute, attribute bit 0 in indexes[URES_INDEX_ATTRIBUTES].
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* New in formatVersion 1.2 (ICU 3.6).
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*
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* If set, then this resource bundle is a standalone bundle.
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* If not set, then the bundle participates in locale fallback, eventually
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* all the way to the root bundle.
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* If indexes[] is missing or too short, then the attribute cannot be determined
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* reliably. Dependency checking should ignore such bundles, and loading should
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* use fallbacks.
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*/
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#define URES_ATT_NO_FALLBACK 1
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/*
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* Attributes for bundles that are, or use, a pool bundle.
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* A pool bundle provides key strings that are shared among several other bundles
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* to reduce their total size.
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* New in formatVersion 2 (ICU 4.4).
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*/
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#define URES_ATT_IS_POOL_BUNDLE 2
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#define URES_ATT_USES_POOL_BUNDLE 4
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/*
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* File format for .res resource bundle files (formatVersion=2, ICU 4.4)
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*
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* New in formatVersion 2 compared with 1.3: -------------
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*
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* Three new resource types -- String-v2, Table16 and Array16 -- have their
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* values stored in a new array of 16-bit units between the table key strings
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* and the start of the other resources.
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*
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* genrb eliminates duplicates among Unicode string-v2 values.
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* Multiple Unicode strings may use the same offset and string data,
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* or a short string may point to the suffix of a longer string. ("Suffix sharing")
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* For example, one string "abc" may be reused for another string "bc" by pointing
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* to the second character. (Short strings-v2 are NUL-terminated
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* and not preceded by an explicit length value.)
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*
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* It is allowed for all resource types to share values.
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* The swapper code (ures_swap()) has been modified so that it swaps each item
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* exactly once.
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*
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* A resource bundle may use a special pool bundle. Some or all of the table key strings
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* of the using-bundle are omitted, and the key string offsets for such key strings refer
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* to offsets in the pool bundle.
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* The using-bundle's and the pool-bundle's indexes[URES_INDEX_POOL_CHECKSUM] values
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* must match.
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* Two bits in indexes[URES_INDEX_ATTRIBUTES] indicate whether a resource bundle
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* is or uses a pool bundle.
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*
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* Table key strings must be compared in ASCII order, even if they are not
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* stored in ASCII.
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*
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* New in formatVersion 1.3 compared with 1.2: -------------
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*
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* genrb eliminates duplicates among key strings.
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* Multiple table items may share one key string, or one item may point
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* to the suffix of another's key string. ("Suffix sharing")
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* For example, one key "abc" may be reused for another key "bc" by pointing
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* to the second character. (Key strings are NUL-terminated.)
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*
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* -------------
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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 or table32 resource item
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* int32_t indexes[indexes[0]]; -- array of indexes for friendly
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* reading and swapping; see URES_INDEX_* above
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* new in formatVersion 1.1 (ICU 2.8)
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* char keys[]; -- characters for key strings
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* (formatVersion 1.0: up to 65k of characters; 1.1: <2G)
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* (minus the space for root and indexes[]),
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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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* uint16_t 16BitUnits[]; -- resources that are stored entirely as sequences of 16-bit units
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* (new in formatVersion 2/ICU 4.4)
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* data is indexed by the offset values in 16-bit resource types,
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* with offset 0 pointing to the beginning of this array;
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* there is a 0 at offset 0, for empty resources;
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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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* 16-bit-unit values:
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* Starting with formatVersion 2/ICU 4.4, some resources are stored in a special
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* array of 16-bit units. Each resource value is a sequence of 16-bit units,
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* with no per-resource padding to a 4-byte boundary.
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* 16-bit container types (Table16 and Array16) contain Resource16 values
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* which are offsets to String-v2 resources in the same 16-bit-units array.
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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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* - Starting with formatVersion 2/ICU 4.4, an offset value of 0 for
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* _any_ resource type indicates an empty value.
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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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* New in formatVersion 2/ICU 4.4: Some types use offsets into the 16-bit-units array,
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* indexing 16-bit units in that array.
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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 below.
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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 offsets to char * key strings.
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* The values of these pairs are either Resource handles or
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* offsets into the 16-bit-units array, depending on the table type.
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*
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* Array items are simple vectors of Resource handles,
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* or of offsets into the 16-bit-units array, depending on the array type.
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*
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* Table key string offsets: -------
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*
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* Key string offsets are 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+sizeof(indexes).
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* (After the 4-byte root handle and after the indexes array.)
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*
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* If the resource bundle uses a pool bundle, then some key strings are stored
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* in the pool bundle rather than in the local bundle itself.
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* - In a Table or Table16, the 16-bit key string offset is local if it is
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* less than indexes[URES_INDEX_KEYS_TOP]<<2.
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* Otherwise, subtract indexes[URES_INDEX_KEYS_TOP]<<2 to get the offset into
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* the pool bundle key strings.
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* - In a Table32, the 32-bit key string offset is local if it is non-negative.
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* Otherwise, reset bit 31 to get the pool key string offset.
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*
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* Unlike the local offset, the pool key offset is relative to
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* the start of the key strings, not to the start of the bundle.
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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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* Some resources have their values stored as sequences of 16-bit units,
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* at 2-byte offsets from the start of a contiguous 16-bit-unit array between
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* the table key strings and the other resources. (new in formatVersion 2/ICU 4.4)
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* At offset 0 of that array is a 16-bit zero value for empty 16-bit resources.
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* Resource16 values in Table16 and Array16 are 16-bit offsets to String-v2
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* resources, with the offsets relative to the start of the 16-bit-units array.
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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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* - the start of the bytes is 16-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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* 4 Table32: int32_t count, int32_t keyStringOffsets[count], Resource[count]
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* (new in formatVersion 1.1/ICU 2.8)
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* 5 Table16: uint16_t count, uint16_t keyStringOffsets[count], Resource16[count]
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* (stored in the 16-bit-units array; new in formatVersion 2/ICU 4.4)
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* 6 Unicode String-v2:UChar[length], (UChar)0; length determined by the first UChar:
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* - if first is not a trail surrogate, then the length is implicit
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* and u_strlen() needs to be called
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* - if first<0xdfef then length=first&0x3ff (and skip first)
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* - if first<0xdfff then length=((first-0xdfef)<<16) | second UChar
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* - if first==0xdfff then length=((second UChar)<<16) | third UChar
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* (stored in the 16-bit-units array; new in formatVersion 2/ICU 4.4)
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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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* 9 Array16: uint16_t count, Resource16[count]
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* (stored in the 16-bit-units array; new in formatVersion 2/ICU 4.4)
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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 or Unicode String-v2
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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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const int32_t *pRoot;
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const uint16_t *p16BitUnits;
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const char *poolBundleKeys;
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Resource rootRes;
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int32_t localKeyLimit;
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UBool noFallback; /* see URES_ATT_NO_FALLBACK */
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UBool isPoolBundle;
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UBool usesPoolBundle;
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UBool useNativeStrcmp;
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} ResourceData;
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/*
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* Read a resource bundle from memory.
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*/
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U_INTERNAL void U_EXPORT2
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res_read(ResourceData *pResData,
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const UDataInfo *pInfo, const void *inBytes, int32_t length,
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UErrorCode *errorCode);
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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 void
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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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U_INTERNAL UResType U_EXPORT2
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res_getPublicType(Resource res);
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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_INTERNAL const UChar * U_EXPORT2
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res_getString(const ResourceData *pResData, Resource res, int32_t *pLength);
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U_INTERNAL const UChar * U_EXPORT2
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res_getAlias(const ResourceData *pResData, Resource res, int32_t *pLength);
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U_INTERNAL const uint8_t * U_EXPORT2
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res_getBinary(const ResourceData *pResData, Resource res, int32_t *pLength);
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U_INTERNAL const int32_t * U_EXPORT2
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res_getIntVector(const ResourceData *pResData, Resource res, int32_t *pLength);
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U_INTERNAL Resource U_EXPORT2
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res_getResource(const ResourceData *pResData, const char *key);
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U_INTERNAL int32_t U_EXPORT2
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res_countArrayItems(const ResourceData *pResData, Resource res);
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U_INTERNAL Resource U_EXPORT2
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res_getArrayItem(const ResourceData *pResData, Resource array, int32_t indexS);
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U_INTERNAL Resource U_EXPORT2
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res_getTableItemByIndex(const ResourceData *pResData, Resource table, int32_t indexS, const char ** key);
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U_INTERNAL Resource U_EXPORT2
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res_getTableItemByKey(const ResourceData *pResData, Resource table, int32_t *indexS, const char* * key);
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/*
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* Modifies the contents of *path (replacing separators with NULs),
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* and also moves *path forward while it finds items.
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*/
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U_CFUNC Resource res_findResource(const ResourceData *pResData, Resource r, char** path, const char** key);
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/**
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* Swap an ICU resource bundle. See udataswp.h.
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* @internal
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*/
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U_CAPI int32_t U_EXPORT2
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ures_swap(const UDataSwapper *ds,
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const void *inData, int32_t length, void *outData,
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UErrorCode *pErrorCode);
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#endif
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