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| -rw-r--r-- | intl/icu/source/common/ucnv_bld.h | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/intl/icu/source/common/ucnv_bld.h b/intl/icu/source/common/ucnv_bld.h new file mode 100644 index 0000000000..43e6c09ac0 --- /dev/null +++ b/intl/icu/source/common/ucnv_bld.h @@ -0,0 +1,296 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +********************************************************************** +* Copyright (C) 1999-2015 International Business Machines +* Corporation and others. All Rights Reserved. +********************************************************************** +* +* +* ucnv_bld.h: +* Contains internal data structure definitions +* Created by Bertrand A. Damiba +* +* Change history: +* +* 06/29/2000 helena Major rewrite of the callback APIs. +*/ + +#ifndef UCNV_BLD_H +#define UCNV_BLD_H + +#include "unicode/utypes.h" + +#if !UCONFIG_NO_CONVERSION + +#include "unicode/ucnv.h" +#include "unicode/ucnv_err.h" +#include "unicode/utf16.h" +#include "ucnv_cnv.h" +#include "ucnvmbcs.h" +#include "ucnv_ext.h" +#include "udataswp.h" + +/* size of the overflow buffers in UConverter, enough for escaping callbacks */ +#define UCNV_ERROR_BUFFER_LENGTH 32 + +/* at most 4 bytes per substitution character (part of .cnv file format! see UConverterStaticData) */ +#define UCNV_MAX_SUBCHAR_LEN 4 + +/* at most 8 bytes per character in toUBytes[] (UTF-8 uses up to 6) */ +#define UCNV_MAX_CHAR_LEN 8 + +/* converter options bits */ +#define UCNV_OPTION_VERSION 0xf +#define UCNV_OPTION_SWAP_LFNL 0x10 + +#define UCNV_GET_VERSION(cnv) ((cnv)->options&UCNV_OPTION_VERSION) + +U_CDECL_BEGIN /* We must declare the following as 'extern "C"' so that if ucnv + itself is compiled under C++, the linkage of the funcptrs will + work. + */ + +union UConverterTable { + UConverterMBCSTable mbcs; +}; + +typedef union UConverterTable UConverterTable; + +struct UConverterImpl; +typedef struct UConverterImpl UConverterImpl; + +/** values for the unicodeMask */ +#define UCNV_HAS_SUPPLEMENTARY 1 +#define UCNV_HAS_SURROGATES 2 + +typedef struct UConverterStaticData { /* +offset: size */ + uint32_t structSize; /* +0: 4 Size of this structure */ + + char name + [UCNV_MAX_CONVERTER_NAME_LENGTH]; /* +4: 60 internal name of the converter- invariant chars */ + + int32_t codepage; /* +64: 4 codepage # (now IBM-$codepage) */ + + int8_t platform; /* +68: 1 platform of the converter (only IBM now) */ + int8_t conversionType; /* +69: 1 conversion type */ + + int8_t minBytesPerChar; /* +70: 1 Minimum # bytes per char in this codepage */ + int8_t maxBytesPerChar; /* +71: 1 Maximum # bytes output per UChar in this codepage */ + + uint8_t subChar[UCNV_MAX_SUBCHAR_LEN]; /* +72: 4 [note: 4 and 8 byte boundary] */ + int8_t subCharLen; /* +76: 1 */ + + uint8_t hasToUnicodeFallback; /* +77: 1 UBool needs to be changed to UBool to be consistent across platform */ + uint8_t hasFromUnicodeFallback; /* +78: 1 */ + uint8_t unicodeMask; /* +79: 1 bit 0: has supplementary bit 1: has single surrogates */ + uint8_t subChar1; /* +80: 1 single-byte substitution character for IBM MBCS (0 if none) */ + uint8_t reserved[19]; /* +81: 19 to round out the structure */ + /* total size: 100 */ +} UConverterStaticData; + +/* + * Defines the UConverterSharedData struct, + * the immutable, shared part of UConverter. + */ +struct UConverterSharedData { + uint32_t structSize; /* Size of this structure */ + uint32_t referenceCounter; /* used to count number of clients, unused for static/immutable SharedData */ + + const void *dataMemory; /* from udata_openChoice() - for cleanup */ + + const UConverterStaticData *staticData; /* pointer to the static (non changing) data. */ + + UBool sharedDataCached; /* true: shared data is in cache, don't destroy on ucnv_close() if 0 ref. false: shared data isn't in the cache, do attempt to clean it up if the ref is 0 */ + /** If false, then referenceCounter is not used. Must not change after initialization. */ + UBool isReferenceCounted; + + const UConverterImpl *impl; /* vtable-style struct of mostly function pointers */ + + /*initial values of some members of the mutable part of object */ + uint32_t toUnicodeStatus; + + /* + * Shared data structures currently come in two flavors: + * - readonly for built-in algorithmic converters + * - allocated for MBCS, with a pointer to an allocated UConverterTable + * which always has a UConverterMBCSTable + * + * To eliminate one allocation, I am making the UConverterMBCSTable + * a member of the shared data. + * + * markus 2003-nov-07 + */ + UConverterMBCSTable mbcs; +}; + +/** UConverterSharedData initializer for static, non-reference-counted converters. */ +#define UCNV_IMMUTABLE_SHARED_DATA_INITIALIZER(pStaticData, pImpl) \ + { \ + sizeof(UConverterSharedData), ~((uint32_t)0), \ + NULL, pStaticData, false, false, pImpl, \ + 0, UCNV_MBCS_TABLE_INITIALIZER \ + } + +/* Defines a UConverter, the lightweight mutable part the user sees */ + +struct UConverter { + /* + * Error function pointer called when conversion issues + * occur during a ucnv_fromUnicode call + */ + void (U_EXPORT2 *fromUCharErrorBehaviour) (const void *context, + UConverterFromUnicodeArgs *args, + const UChar *codeUnits, + int32_t length, + UChar32 codePoint, + UConverterCallbackReason reason, + UErrorCode *); + /* + * Error function pointer called when conversion issues + * occur during a ucnv_toUnicode call + */ + void (U_EXPORT2 *fromCharErrorBehaviour) (const void *context, + UConverterToUnicodeArgs *args, + const char *codeUnits, + int32_t length, + UConverterCallbackReason reason, + UErrorCode *); + + /* + * Pointer to additional data that depends on the converter type. + * Used by ISO 2022, SCSU, GB 18030 converters, possibly more. + */ + void *extraInfo; + + const void *fromUContext; + const void *toUContext; + + /* + * Pointer to charset bytes for substitution string if subCharLen>0, + * or pointer to Unicode string (UChar *) if subCharLen<0. + * subCharLen==0 is equivalent to using a skip callback. + * If the pointer is !=subUChars then it is allocated with + * UCNV_ERROR_BUFFER_LENGTH * U_SIZEOF_UCHAR bytes. + * The subUChars field is declared as UChar[] not uint8_t[] to + * guarantee alignment for UChars. + */ + uint8_t *subChars; + + UConverterSharedData *sharedData; /* Pointer to the shared immutable part of the converter object */ + + uint32_t options; /* options flags from UConverterOpen, may contain additional bits */ + + UBool sharedDataIsCached; /* true: shared data is in cache, don't destroy on ucnv_close() if 0 ref. false: shared data isn't in the cache, do attempt to clean it up if the ref is 0 */ + UBool isCopyLocal; /* true if UConverter is not owned and not released in ucnv_close() (stack-allocated, safeClone(), etc.) */ + UBool isExtraLocal; /* true if extraInfo is not owned and not released in ucnv_close() (stack-allocated, safeClone(), etc.) */ + + UBool useFallback; + int8_t toULength; /* number of bytes in toUBytes */ + uint8_t toUBytes[UCNV_MAX_CHAR_LEN-1];/* more "toU status"; keeps the bytes of the current character */ + uint32_t toUnicodeStatus; /* Used to internalize stream status information */ + int32_t mode; + uint32_t fromUnicodeStatus; + + /* + * More fromUnicode() status. Serves 3 purposes: + * - keeps a lead surrogate between buffers (similar to toUBytes[]) + * - keeps a lead surrogate at the end of the stream, + * which the framework handles as truncated input + * - if the fromUnicode() implementation returns to the framework + * (ucnv.c ucnv_fromUnicode()), then the framework calls the callback + * for this code point + */ + UChar32 fromUChar32; + + /* + * value for ucnv_getMaxCharSize() + * + * usually simply copied from the static data, but ucnvmbcs.c modifies + * the value depending on the converter type and options + */ + int8_t maxBytesPerUChar; + + int8_t subCharLen; /* length of the codepage specific character sequence */ + int8_t invalidCharLength; + int8_t charErrorBufferLength; /* number of valid bytes in charErrorBuffer */ + + int8_t invalidUCharLength; + int8_t UCharErrorBufferLength; /* number of valid UChars in charErrorBuffer */ + + uint8_t subChar1; /* single-byte substitution character if different from subChar */ + UBool useSubChar1; + char invalidCharBuffer[UCNV_MAX_CHAR_LEN]; /* bytes from last error/callback situation */ + uint8_t charErrorBuffer[UCNV_ERROR_BUFFER_LENGTH]; /* codepage output from Error functions */ + UChar subUChars[UCNV_MAX_SUBCHAR_LEN/U_SIZEOF_UCHAR]; /* see subChars documentation */ + + UChar invalidUCharBuffer[U16_MAX_LENGTH]; /* UChars from last error/callback situation */ + UChar UCharErrorBuffer[UCNV_ERROR_BUFFER_LENGTH]; /* unicode output from Error functions */ + + /* fields for conversion extension */ + + /* store previous UChars/chars to continue partial matches */ + UChar32 preFromUFirstCP; /* >=0: partial match */ + UChar preFromU[UCNV_EXT_MAX_UCHARS]; + char preToU[UCNV_EXT_MAX_BYTES]; + int8_t preFromULength, preToULength; /* negative: replay */ + int8_t preToUFirstLength; /* length of first character */ + + /* new fields for ICU 4.0 */ + UConverterCallbackReason toUCallbackReason; /* (*fromCharErrorBehaviour) reason, set when error is detected */ +}; + +U_CDECL_END /* end of UConverter */ + +#define CONVERTER_FILE_EXTENSION ".cnv" + + +/** + * Return the number of all converter names. + * @param pErrorCode The error code + * @return the number of all converter names + */ +U_CFUNC uint16_t +ucnv_bld_countAvailableConverters(UErrorCode *pErrorCode); + +/** + * Return the (n)th converter name in mixed case, or NULL + * if there is none (typically, if the data cannot be loaded). + * 0<=index<ucnv_io_countAvailableConverters(). + * @param n The number specifies which converter name to get + * @param pErrorCode The error code + * @return the (n)th converter name in mixed case, or NULL if there is none. + */ +U_CFUNC const char * +ucnv_bld_getAvailableConverter(uint16_t n, UErrorCode *pErrorCode); + +/** + * Load a non-algorithmic converter. + * If pkg==NULL, then this function must be called inside umtx_lock(&cnvCacheMutex). + */ +U_CAPI UConverterSharedData * +ucnv_load(UConverterLoadArgs *pArgs, UErrorCode *err); + +/** + * Unload a non-algorithmic converter. + * It must be sharedData->isReferenceCounted + * and this function must be called inside umtx_lock(&cnvCacheMutex). + */ +U_CAPI void +ucnv_unload(UConverterSharedData *sharedData); + +/** + * Swap ICU .cnv conversion tables. See udataswp.h. + * @internal + */ +U_CAPI int32_t U_EXPORT2 +ucnv_swap(const UDataSwapper *ds, + const void *inData, int32_t length, void *outData, + UErrorCode *pErrorCode); + +U_CAPI void U_EXPORT2 +ucnv_enableCleanup(void); + +#endif + +#endif /* _UCNV_BLD */ |