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