diff options
Diffstat (limited to 'intl/icu/source/common/uresdata.h')
| -rw-r--r-- | intl/icu/source/common/uresdata.h | 519 |
1 files changed, 519 insertions, 0 deletions
diff --git a/intl/icu/source/common/uresdata.h b/intl/icu/source/common/uresdata.h new file mode 100644 index 000000000..ae7d9a817 --- /dev/null +++ b/intl/icu/source/common/uresdata.h @@ -0,0 +1,519 @@ +// Copyright (C) 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +****************************************************************************** +* Copyright (C) 1999-2016, International Business Machines +* Corporation and others. All Rights Reserved. +****************************************************************************** +* file name: uresdata.h +* encoding: US-ASCII +* tab size: 8 (not used) +* indentation:4 +* +* created on: 1999dec08 +* created by: Markus W. Scherer +* 06/24/02 weiv Added support for resource sharing +*/ + +#ifndef __RESDATA_H__ +#define __RESDATA_H__ + +#include "unicode/utypes.h" +#include "unicode/udata.h" +#include "unicode/ures.h" +#include "putilimp.h" +#include "udataswp.h" + +/** + * Numeric constants for internal-only types of resource items. + * These must use different numeric values than UResType constants + * because they are used together. + * Internal types are never returned by ures_getType(). + */ +typedef enum { + /** Include a negative value so that the compiler uses the same int type as for UResType. */ + URES_INTERNAL_NONE=-1, + + /** Resource type constant for tables with 32-bit count, key offsets and values. */ + URES_TABLE32=4, + + /** + * Resource type constant for tables with 16-bit count, key offsets and values. + * All values are URES_STRING_V2 strings. + */ + URES_TABLE16=5, + + /** Resource type constant for 16-bit Unicode strings in formatVersion 2. */ + URES_STRING_V2=6, + + /** + * Resource type constant for arrays with 16-bit count and values. + * All values are URES_STRING_V2 strings. + */ + URES_ARRAY16=9 + + /* Resource type 15 is not defined but effectively used by RES_BOGUS=0xffffffff. */ +} UResInternalType; + +/* + * A Resource is a 32-bit value that has 2 bit fields: + * 31..28 4-bit type, see enum below + * 27..0 28-bit four-byte-offset or value according to the type + */ +typedef uint32_t Resource; + +#define RES_BOGUS 0xffffffff +#define RES_MAX_OFFSET 0x0fffffff + +#define RES_GET_TYPE(res) ((int32_t)((res)>>28UL)) +#define RES_GET_OFFSET(res) ((res)&0x0fffffff) +#define RES_GET_POINTER(pRoot, res) ((pRoot)+RES_GET_OFFSET(res)) + +/* get signed and unsigned integer values directly from the Resource handle */ +#if U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC +# define RES_GET_INT(res) (((int32_t)((res)<<4L))>>4L) +#else +# define RES_GET_INT(res) (int32_t)(((res)&0x08000000) ? (res)|0xf0000000 : (res)&0x07ffffff) +#endif + +#define RES_GET_UINT(res) ((res)&0x0fffffff) + +#define URES_IS_ARRAY(type) ((int32_t)(type)==URES_ARRAY || (int32_t)(type)==URES_ARRAY16) +#define URES_IS_TABLE(type) ((int32_t)(type)==URES_TABLE || (int32_t)(type)==URES_TABLE16 || (int32_t)(type)==URES_TABLE32) +#define URES_IS_CONTAINER(type) (URES_IS_TABLE(type) || URES_IS_ARRAY(type)) + +#define URES_MAKE_RESOURCE(type, offset) (((Resource)(type)<<28)|(Resource)(offset)) +#define URES_MAKE_EMPTY_RESOURCE(type) ((Resource)(type)<<28) + +/* indexes[] value names; indexes are generally 32-bit (Resource) indexes */ +enum { + /** + * [0] contains the length of indexes[] + * which is at most URES_INDEX_TOP of the latest format version + * + * formatVersion==1: all bits contain the length of indexes[] + * but the length is much less than 0xff; + * formatVersion>1: + * only bits 7..0 contain the length of indexes[], + * bits 31..8 are reserved and set to 0 + * formatVersion>=3: + * bits 31..8 poolStringIndexLimit bits 23..0 + */ + URES_INDEX_LENGTH, + /** + * [1] contains the top of the key strings, + * same as the bottom of resources or UTF-16 strings, rounded up + */ + URES_INDEX_KEYS_TOP, + /** [2] contains the top of all resources */ + URES_INDEX_RESOURCES_TOP, + /** + * [3] contains the top of the bundle, + * in case it were ever different from [2] + */ + URES_INDEX_BUNDLE_TOP, + /** [4] max. length of any table */ + URES_INDEX_MAX_TABLE_LENGTH, + /** + * [5] attributes bit set, see URES_ATT_* (new in formatVersion 1.2) + * + * formatVersion>=3: + * bits 31..16 poolStringIndex16Limit + * bits 15..12 poolStringIndexLimit bits 27..24 + */ + URES_INDEX_ATTRIBUTES, + /** + * [6] top of the 16-bit units (UTF-16 string v2 UChars, URES_TABLE16, URES_ARRAY16), + * rounded up (new in formatVersion 2.0, ICU 4.4) + */ + URES_INDEX_16BIT_TOP, + /** [7] checksum of the pool bundle (new in formatVersion 2.0, ICU 4.4) */ + URES_INDEX_POOL_CHECKSUM, + URES_INDEX_TOP +}; + +/* + * Nofallback attribute, attribute bit 0 in indexes[URES_INDEX_ATTRIBUTES]. + * New in formatVersion 1.2 (ICU 3.6). + * + * If set, then this resource bundle is a standalone bundle. + * If not set, then the bundle participates in locale fallback, eventually + * all the way to the root bundle. + * If indexes[] is missing or too short, then the attribute cannot be determined + * reliably. Dependency checking should ignore such bundles, and loading should + * use fallbacks. + */ +#define URES_ATT_NO_FALLBACK 1 + +/* + * Attributes for bundles that are, or use, a pool bundle. + * A pool bundle provides key strings that are shared among several other bundles + * to reduce their total size. + * New in formatVersion 2 (ICU 4.4). + */ +#define URES_ATT_IS_POOL_BUNDLE 2 +#define URES_ATT_USES_POOL_BUNDLE 4 + +/* + * File format for .res resource bundle files + * + * ICU 56: New in formatVersion 3 compared with 2: ------------- + * + * Resource bundles can optionally use shared string-v2 values + * stored in the pool bundle. + * If so, then the indexes[] contain two new values + * in previously-unused bits of existing indexes[] slots: + * - poolStringIndexLimit: + * String-v2 offsets (in 32-bit Resource words) below this limit + * point to pool bundle string-v2 values. + * - poolStringIndex16Limit: + * Resource16 string-v2 offsets below this limit + * point to pool bundle string-v2 values. + * Guarantee: poolStringIndex16Limit <= poolStringIndexLimit + * + * The local bundle's poolStringIndexLimit is greater than + * any pool bundle string index used in the local bundle. + * The poolStringIndexLimit should not be greater than + * the maximum possible pool bundle string index. + * + * The maximum possible pool bundle string index is the index to the last non-NUL + * pool string character, due to suffix sharing. + * + * In the pool bundle, there is no structure that lists the strings. + * (The root resource is an empty Table.) + * If the strings need to be enumerated (as genrb --usePoolBundle does), + * then iterate through the pool bundle's 16-bit-units array from the beginning. + * Stop at the end of the array, or when an explicit or implicit string length + * would lead beyond the end of the array, + * or when an apparent string is not NUL-terminated. + * (Future genrb version might terminate the strings with + * what looks like a large explicit string length.) + * + * ICU 4.4: New in formatVersion 2 compared with 1.3: ------------- + * + * Three new resource types -- String-v2, Table16 and Array16 -- have their + * values stored in a new array of 16-bit units between the table key strings + * and the start of the other resources. + * + * genrb eliminates duplicates among Unicode string-v2 values. + * Multiple Unicode strings may use the same offset and string data, + * or a short string may point to the suffix of a longer string. ("Suffix sharing") + * For example, one string "abc" may be reused for another string "bc" by pointing + * to the second character. (Short strings-v2 are NUL-terminated + * and not preceded by an explicit length value.) + * + * It is allowed for all resource types to share values. + * The swapper code (ures_swap()) has been modified so that it swaps each item + * exactly once. + * + * A resource bundle may use a special pool bundle. Some or all of the table key strings + * of the using-bundle are omitted, and the key string offsets for such key strings refer + * to offsets in the pool bundle. + * The using-bundle's and the pool-bundle's indexes[URES_INDEX_POOL_CHECKSUM] values + * must match. + * Two bits in indexes[URES_INDEX_ATTRIBUTES] indicate whether a resource bundle + * is or uses a pool bundle. + * + * Table key strings must be compared in ASCII order, even if they are not + * stored in ASCII. + * + * New in formatVersion 1.3 compared with 1.2: ------------- + * + * genrb eliminates duplicates among key strings. + * Multiple table items may share one key string, or one item may point + * to the suffix of another's key string. ("Suffix sharing") + * For example, one key "abc" may be reused for another key "bc" by pointing + * to the second character. (Key strings are NUL-terminated.) + * + * ------------- + * + * An ICU4C resource bundle file (.res) is a binary, memory-mappable file + * with nested, hierarchical data structures. + * It physically contains the following: + * + * Resource root; -- 32-bit Resource item, root item for this bundle's tree; + * currently, the root item must be a table or table32 resource item + * int32_t indexes[indexes[0]]; -- array of indexes for friendly + * reading and swapping; see URES_INDEX_* above + * new in formatVersion 1.1 (ICU 2.8) + * char keys[]; -- characters for key strings + * (formatVersion 1.0: up to 65k of characters; 1.1: <2G) + * (minus the space for root and indexes[]), + * which consist of invariant characters (ASCII/EBCDIC) and are NUL-terminated; + * padded to multiple of 4 bytes for 4-alignment of the following data + * uint16_t 16BitUnits[]; -- resources that are stored entirely as sequences of 16-bit units + * (new in formatVersion 2/ICU 4.4) + * data is indexed by the offset values in 16-bit resource types, + * with offset 0 pointing to the beginning of this array; + * there is a 0 at offset 0, for empty resources; + * padded to multiple of 4 bytes for 4-alignment of the following data + * data; -- data directly and indirectly indexed by the root item; + * the structure is determined by walking the tree + * + * Each resource bundle item has a 32-bit Resource handle (see typedef above) + * which contains the item type number in its upper 4 bits (31..28) and either + * an offset or a direct value in its lower 28 bits (27..0). + * The order of items is undefined and only determined by walking the tree. + * Leaves of the tree may be stored first or last or anywhere in between, + * and it is in theory possible to have unreferenced holes in the file. + * + * 16-bit-unit values: + * Starting with formatVersion 2/ICU 4.4, some resources are stored in a special + * array of 16-bit units. Each resource value is a sequence of 16-bit units, + * with no per-resource padding to a 4-byte boundary. + * 16-bit container types (Table16 and Array16) contain Resource16 values + * which are offsets to String-v2 resources in the same 16-bit-units array. + * + * Direct values: + * - Empty Unicode strings have an offset value of 0 in the Resource handle itself. + * - Starting with formatVersion 2/ICU 4.4, an offset value of 0 for + * _any_ resource type indicates an empty value. + * - Integer values are 28-bit values stored in the Resource handle itself; + * the interpretation of unsigned vs. signed integers is up to the application. + * + * All other types and values use 28-bit offsets to point to the item's data. + * The offset is an index to the first 32-bit word of the value, relative to the + * start of the resource data (i.e., the root item handle is at offset 0). + * To get byte offsets, the offset is multiplied by 4 (or shifted left by 2 bits). + * All resource item values are 4-aligned. + * + * New in formatVersion 2/ICU 4.4: Some types use offsets into the 16-bit-units array, + * indexing 16-bit units in that array. + * + * The structures (memory layouts) for the values for each item type are listed + * in the table below. + * + * Nested, hierarchical structures: ------------- + * + * Table items contain key-value pairs where the keys are offsets to char * key strings. + * The values of these pairs are either Resource handles or + * offsets into the 16-bit-units array, depending on the table type. + * + * Array items are simple vectors of Resource handles, + * or of offsets into the 16-bit-units array, depending on the array type. + * + * Table key string offsets: ------- + * + * Key string offsets are relative to the start of the resource data (of the root handle), + * i.e., the first string has an offset of 4+sizeof(indexes). + * (After the 4-byte root handle and after the indexes array.) + * + * If the resource bundle uses a pool bundle, then some key strings are stored + * in the pool bundle rather than in the local bundle itself. + * - In a Table or Table16, the 16-bit key string offset is local if it is + * less than indexes[URES_INDEX_KEYS_TOP]<<2. + * Otherwise, subtract indexes[URES_INDEX_KEYS_TOP]<<2 to get the offset into + * the pool bundle key strings. + * - In a Table32, the 32-bit key string offset is local if it is non-negative. + * Otherwise, reset bit 31 to get the pool key string offset. + * + * Unlike the local offset, the pool key offset is relative to + * the start of the key strings, not to the start of the bundle. + * + * An alias item is special (and new in ICU 2.4): -------------- + * + * Its memory layout is just like for a UnicodeString, but at runtime it resolves to + * another resource bundle's item according to the path in the string. + * This is used to share items across bundles that are in different lookup/fallback + * chains (e.g., large collation data among zh_TW and zh_HK). + * This saves space (for large items) and maintenance effort (less duplication of data). + * + * -------------------------------------------------------------------------- + * + * Resource types: + * + * Most resources have their values stored at four-byte offsets from the start + * of the resource data. These values are at least 4-aligned. + * Some resource values are stored directly in the offset field of the Resource itself. + * See UResType in unicode/ures.h for enumeration constants for Resource types. + * + * Some resources have their values stored as sequences of 16-bit units, + * at 2-byte offsets from the start of a contiguous 16-bit-unit array between + * the table key strings and the other resources. (new in formatVersion 2/ICU 4.4) + * At offset 0 of that array is a 16-bit zero value for empty 16-bit resources. + * + * Resource16 values in Table16 and Array16 are 16-bit offsets to String-v2 + * resources, with the offsets relative to the start of the 16-bit-units array. + * Starting with formatVersion 3/ICU 56, if offset<poolStringIndex16Limit + * then use the pool bundle's 16-bit-units array, + * otherwise subtract that limit and use the local 16-bit-units array. + * + * Type Name Memory layout of values + * (in parentheses: scalar, non-offset values) + * + * 0 Unicode String: int32_t length, UChar[length], (UChar)0, (padding) + * or (empty string ("") if offset==0) + * 1 Binary: int32_t length, uint8_t[length], (padding) + * - the start of the bytes is 16-aligned - + * 2 Table: uint16_t count, uint16_t keyStringOffsets[count], (uint16_t padding), Resource[count] + * 3 Alias: (physically same value layout as string, new in ICU 2.4) + * 4 Table32: int32_t count, int32_t keyStringOffsets[count], Resource[count] + * (new in formatVersion 1.1/ICU 2.8) + * 5 Table16: uint16_t count, uint16_t keyStringOffsets[count], Resource16[count] + * (stored in the 16-bit-units array; new in formatVersion 2/ICU 4.4) + * 6 Unicode String-v2:UChar[length], (UChar)0; length determined by the first UChar: + * - if first is not a trail surrogate, then the length is implicit + * and u_strlen() needs to be called + * - if first<0xdfef then length=first&0x3ff (and skip first) + * - if first<0xdfff then length=((first-0xdfef)<<16) | second UChar + * - if first==0xdfff then length=((second UChar)<<16) | third UChar + * (stored in the 16-bit-units array; new in formatVersion 2/ICU 4.4) + * + * Starting with formatVersion 3/ICU 56, if offset<poolStringIndexLimit + * then use the pool bundle's 16-bit-units array, + * otherwise subtract that limit and use the local 16-bit-units array. + * (Note different limits for Resource16 vs. Resource.) + * + * 7 Integer: (28-bit offset is integer value) + * 8 Array: int32_t count, Resource[count] + * 9 Array16: uint16_t count, Resource16[count] + * (stored in the 16-bit-units array; new in formatVersion 2/ICU 4.4) + * 14 Integer Vector: int32_t length, int32_t[length] + * 15 Reserved: This value denotes special purpose resources and is for internal use. + * + * Note that there are 3 types with data vector values: + * - Vectors of 8-bit bytes stored as type Binary. + * - Vectors of 16-bit words stored as type Unicode String or Unicode String-v2 + * (no value restrictions, all values 0..ffff allowed!). + * - Vectors of 32-bit words stored as type Integer Vector. + */ + +/* + * Structure for a single, memory-mapped ResourceBundle. + */ +typedef struct ResourceData { + UDataMemory *data; + const int32_t *pRoot; + const uint16_t *p16BitUnits; + const char *poolBundleKeys; + Resource rootRes; + int32_t localKeyLimit; + const uint16_t *poolBundleStrings; + int32_t poolStringIndexLimit; + int32_t poolStringIndex16Limit; + UBool noFallback; /* see URES_ATT_NO_FALLBACK */ + UBool isPoolBundle; + UBool usesPoolBundle; + UBool useNativeStrcmp; +} ResourceData; + +/* + * Read a resource bundle from memory. + */ +U_INTERNAL void U_EXPORT2 +res_read(ResourceData *pResData, + const UDataInfo *pInfo, const void *inBytes, int32_t length, + UErrorCode *errorCode); + +/* + * Load a resource bundle file. + * The ResourceData structure must be allocated externally. + */ +U_CFUNC void +res_load(ResourceData *pResData, + const char *path, const char *name, UErrorCode *errorCode); + +/* + * Release a resource bundle file. + * This does not release the ResourceData structure itself. + */ +U_CFUNC void +res_unload(ResourceData *pResData); + +U_INTERNAL UResType U_EXPORT2 +res_getPublicType(Resource res); + +/* + * Return a pointer to a zero-terminated, const UChar* string + * and set its length in *pLength. + * Returns NULL if not found. + */ +U_INTERNAL const UChar * U_EXPORT2 +res_getString(const ResourceData *pResData, Resource res, int32_t *pLength); + +U_INTERNAL const UChar * U_EXPORT2 +res_getAlias(const ResourceData *pResData, Resource res, int32_t *pLength); + +U_INTERNAL const uint8_t * U_EXPORT2 +res_getBinary(const ResourceData *pResData, Resource res, int32_t *pLength); + +U_INTERNAL const int32_t * U_EXPORT2 +res_getIntVector(const ResourceData *pResData, Resource res, int32_t *pLength); + +U_INTERNAL Resource U_EXPORT2 +res_getResource(const ResourceData *pResData, const char *key); + +U_INTERNAL int32_t U_EXPORT2 +res_countArrayItems(const ResourceData *pResData, Resource res); + +U_INTERNAL Resource U_EXPORT2 +res_getArrayItem(const ResourceData *pResData, Resource array, int32_t indexS); + +U_INTERNAL Resource U_EXPORT2 +res_getTableItemByIndex(const ResourceData *pResData, Resource table, int32_t indexS, const char ** key); + +U_INTERNAL Resource U_EXPORT2 +res_getTableItemByKey(const ResourceData *pResData, Resource table, int32_t *indexS, const char* * key); + +/** + * Iterates over the path and stops when a scalar resource is found. + * Follows aliases. + * Modifies the contents of *path (replacing separators with NULs), + * and also moves *path forward while it finds items. + * + * @param path input: "CollationElements/Sequence" or "zoneStrings/3/2" etc.; + * output: points to the part that has not yet been processed + */ +U_CFUNC Resource res_findResource(const ResourceData *pResData, Resource r, + char** path, const char** key); + +#ifdef __cplusplus + +#include "resource.h" + +U_NAMESPACE_BEGIN + +class ResourceDataValue : public ResourceValue { +public: + ResourceDataValue() : pResData(NULL), res(URES_NONE) {} + virtual ~ResourceDataValue(); + + void setData(const ResourceData *data) { pResData = data; } + void setResource(Resource r) { res = r; } + + virtual UResType getType() const; + virtual const UChar *getString(int32_t &length, UErrorCode &errorCode) const; + virtual const UChar *getAliasString(int32_t &length, UErrorCode &errorCode) const; + virtual int32_t getInt(UErrorCode &errorCode) const; + virtual uint32_t getUInt(UErrorCode &errorCode) const; + virtual const int32_t *getIntVector(int32_t &length, UErrorCode &errorCode) const; + virtual const uint8_t *getBinary(int32_t &length, UErrorCode &errorCode) const; + virtual ResourceArray getArray(UErrorCode &errorCode) const; + virtual ResourceTable getTable(UErrorCode &errorCode) const; + virtual UBool isNoInheritanceMarker() const; + virtual int32_t getStringArray(UnicodeString *dest, int32_t capacity, + UErrorCode &errorCode) const; + virtual int32_t getStringArrayOrStringAsArray(UnicodeString *dest, int32_t capacity, + UErrorCode &errorCode) const; + virtual UnicodeString getStringOrFirstOfArray(UErrorCode &errorCode) const; + + const ResourceData *pResData; + +private: + Resource res; +}; + +U_NAMESPACE_END + +#endif /* __cplusplus */ + +/** + * Swap an ICU resource bundle. See udataswp.h. + * @internal + */ +U_CAPI int32_t U_EXPORT2 +ures_swap(const UDataSwapper *ds, + const void *inData, int32_t length, void *outData, + UErrorCode *pErrorCode); + +#endif |