icuSources/common/ucnv_bld.h

   1 /*
   2 **********************************************************************
   3 *   Copyright (C) 1999-2004, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 **********************************************************************
   6 *
   7 *
   8 *  ucnv_bld.h:
   9 *  Contains internal data structure definitions
  10 * Created by Bertrand A. Damiba
  11 *
  12 *   Change history:
  13 *
  14 *   06/29/2000  helena      Major rewrite of the callback APIs.
  15 */
  16
  17 #ifndef UCNV_BLD_H
  18 #define UCNV_BLD_H
  19
  20 #include "unicode/utypes.h"
  21
  22 #if !UCONFIG_NO_CONVERSION
  23
  24 #include "unicode/ucnv.h"
  25 #include "unicode/ucnv_err.h"
  26 #include "ucnv_cnv.h"
  27 #include "ucnvmbcs.h"
  28 #include "ucnv_ext.h"
  29 #include "udataswp.h"
  30
  31 /* size of the overflow buffers in UConverter, enough for escaping callbacks */
  32 #define UCNV_ERROR_BUFFER_LENGTH 32
  33
  34 /* at most 4 bytes per substitution character (part of .cnv file format! see UConverterStaticData) */
  35 #define UCNV_MAX_SUBCHAR_LEN 4
  36
  37 /* at most 8 bytes per character in toUBytes[] (UTF-8 uses up to 6) */
  38 #define UCNV_MAX_CHAR_LEN 8
  39
  40 /* converter options bits */
  41 #define UCNV_OPTION_VERSION     0xf
  42 #define UCNV_OPTION_SWAP_LFNL   0x10
  43
  44
  45 U_CDECL_BEGIN /* We must declare the following as 'extern "C"' so that if ucnv
  46                  itself is compiled under C++, the linkage of the funcptrs will
  47                  work.
  48               */
  49
  50 union UConverterTable {
  51     UConverterMBCSTable mbcs;
  52 };
  53
  54 typedef union UConverterTable UConverterTable;
  55
  56 struct UConverterImpl;
  57 typedef struct UConverterImpl UConverterImpl;
  58
  59 /** values for the unicodeMask */
  60 #define UCNV_HAS_SUPPLEMENTARY 1
  61 #define UCNV_HAS_SURROGATES    2
  62
  63 typedef struct UConverterStaticData {   /* +offset: size */
  64     uint32_t structSize;                /* +0: 4 Size of this structure */
  65
  66     char name
  67       [UCNV_MAX_CONVERTER_NAME_LENGTH]; /* +4: 60  internal name of the converter- invariant chars */
  68
  69     int32_t codepage;               /* +64: 4 codepage # (now IBM-$codepage) */
  70
  71     int8_t platform;                /* +68: 1 platform of the converter (only IBM now) */
  72     int8_t conversionType;          /* +69: 1 conversion type */
  73
  74     int8_t minBytesPerChar;         /* +70: 1 Minimum # bytes per char in this codepage */
  75     int8_t maxBytesPerChar;         /* +71: 1 Maximum # bytes output per UChar in this codepage */
  76
  77     uint8_t subChar[UCNV_MAX_SUBCHAR_LEN]; /* +72: 4  [note:  4 and 8 byte boundary] */
  78     int8_t subCharLen;              /* +76: 1 */
  79
  80     uint8_t hasToUnicodeFallback;   /* +77: 1 UBool needs to be changed to UBool to be consistent across platform */
  81     uint8_t hasFromUnicodeFallback; /* +78: 1 */
  82     uint8_t unicodeMask;            /* +79: 1  bit 0: has supplementary  bit 1: has single surrogates */
  83     uint8_t subChar1;               /* +80: 1  single-byte substitution character for IBM MBCS (0 if none) */
  84     uint8_t reserved[19];           /* +81: 19 to round out the structure */
  85                                     /* total size: 100 */
  86 } UConverterStaticData;
  87
  88 /*
  89  * Defines the UConverterSharedData struct,
  90  * the immutable, shared part of UConverter.
  91  */
  92 struct UConverterSharedData {
  93     uint32_t structSize;            /* Size of this structure */
  94     uint32_t referenceCounter;      /* used to count number of clients, 0xffffffff for static SharedData */
  95
  96     const void *dataMemory;         /* from udata_openChoice() - for cleanup */
  97     void *table;                    /* Unused. This used to be a UConverterTable - Pointer to conversion data - see mbcs below */
  98
  99     const UConverterStaticData *staticData; /* pointer to the static (non changing) data. */
 100
 101     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 */
 102   /*UBool               staticDataOwned;   TRUE if static data owned by shared data & should be freed with it, NEVER true for udata() loaded statics. This ignored variable was removed to make space for sharedDataCached.   */
 103
 104     const UConverterImpl *impl;     /* vtable-style struct of mostly function pointers */
 105
 106     /*initial values of some members of the mutable part of object */
 107     uint32_t toUnicodeStatus;
 108
 109     /*
 110      * Shared data structures currently come in two flavors:
 111      * - readonly for built-in algorithmic converters
 112      * - allocated for MBCS, with a pointer to an allocated UConverterTable
 113      *   which always has a UConverterMBCSTable
 114      *
 115      * To eliminate one allocation, I am making the UConverterMBCSTable
 116      * a member of the shared data. It is the last member so that static
 117      * definitions of UConverterSharedData work as before.
 118      * The table field above also remains to avoid updating all static
 119      * definitions, but is now unused.
 120      *
 121      * markus 2003-nov-07
 122      */
 123     UConverterMBCSTable mbcs;
 124 };
 125
 126 /* Defines a UConverter, the lightweight mutable part the user sees */
 127
 128 struct UConverter {
 129     /*
 130      * Error function pointer called when conversion issues
 131      * occur during a ucnv_fromUnicode call
 132      */
 133     void (U_EXPORT2 *fromUCharErrorBehaviour) (const void *context,
 134                                      UConverterFromUnicodeArgs *args,
 135                                      const UChar *codeUnits,
 136                                      int32_t length,
 137                                      UChar32 codePoint,
 138                                      UConverterCallbackReason reason,
 139                                      UErrorCode *);
 140     /*
 141      * Error function pointer called when conversion issues
 142      * occur during a ucnv_toUnicode call
 143      */
 144     void (U_EXPORT2 *fromCharErrorBehaviour) (const void *context,
 145                                     UConverterToUnicodeArgs *args,
 146                                     const char *codeUnits,
 147                                     int32_t length,
 148                                     UConverterCallbackReason reason,
 149                                     UErrorCode *);
 150
 151     /*
 152      * Pointer to additional data that depends on the converter type.
 153      * Used by ISO 2022, SCSU, GB 18030 converters, possibly more.
 154      */
 155     void *extraInfo;
 156
 157     const void *fromUContext;
 158     const void *toUContext;
 159
 160     UConverterSharedData *sharedData;   /* Pointer to the shared immutable part of the converter object */
 161
 162     uint32_t options; /* options flags from UConverterOpen, may contain additional bits */
 163
 164     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 */
 165     UBool isCopyLocal;  /* TRUE if UConverter is not owned and not released in ucnv_close() (stack-allocated, safeClone(), etc.) */
 166     UBool isExtraLocal; /* TRUE if extraInfo is not owned and not released in ucnv_close() (stack-allocated, safeClone(), etc.) */
 167
 168     UBool  useFallback;
 169     int8_t toULength;                   /* number of bytes in toUBytes */
 170     uint8_t toUBytes[UCNV_MAX_CHAR_LEN-1];/* more "toU status"; keeps the bytes of the current character */
 171     uint32_t toUnicodeStatus;           /* Used to internalize stream status information */
 172     int32_t mode;
 173     uint32_t fromUnicodeStatus;
 174
 175     /*
 176      * More fromUnicode() status. Serves 3 purposes:
 177      * - keeps a lead surrogate between buffers (similar to toUBytes[])
 178      * - keeps a lead surrogate at the end of the stream,
 179      *   which the framework handles as truncated input
 180      * - if the fromUnicode() implementation returns to the framework
 181      *   (ucnv.c ucnv_fromUnicode()), then the framework calls the callback
 182      *   for this code point
 183      */
 184     UChar32 fromUChar32;
 185
 186     /*
 187      * value for ucnv_getMaxCharSize()
 188      *
 189      * usually simply copied from the static data, but ucnvmbcs.c modifies
 190      * the value depending on the converter type and options
 191      */
 192     int8_t maxBytesPerUChar;
 193
 194     int8_t subCharLen;                  /* length of the codepage specific character sequence */
 195     int8_t invalidCharLength;
 196     int8_t charErrorBufferLength;       /* number of valid bytes in charErrorBuffer */
 197
 198     int8_t invalidUCharLength;
 199     int8_t UCharErrorBufferLength;      /* number of valid UChars in charErrorBuffer */
 200
 201     uint8_t subChar1;                                   /* single-byte substitution character if different from subChar */
 202     UBool useSubChar1;
 203     uint8_t subChar[UCNV_MAX_SUBCHAR_LEN];              /* codepage specific character sequence */
 204     char invalidCharBuffer[UCNV_MAX_CHAR_LEN];          /* bytes from last error/callback situation */
 205     uint8_t charErrorBuffer[UCNV_ERROR_BUFFER_LENGTH];  /* codepage output from Error functions */
 206
 207     UChar invalidUCharBuffer[U16_MAX_LENGTH];           /* UChars from last error/callback situation */
 208     UChar UCharErrorBuffer[UCNV_ERROR_BUFFER_LENGTH];   /* unicode output from Error functions */
 209
 210     /* fields for conversion extension */
 211
 212     /* store previous UChars/chars to continue partial matches */
 213     UChar32 preFromUFirstCP;                /* >=0: partial match */
 214     UChar preFromU[UCNV_EXT_MAX_UCHARS];
 215     char preToU[UCNV_EXT_MAX_BYTES];
 216     int8_t preFromULength, preToULength;    /* negative: replay */
 217     int8_t preToUFirstLength;               /* length of first character */
 218 };
 219
 220 U_CDECL_END /* end of UConverter */
 221
 222 #define CONVERTER_FILE_EXTENSION ".cnv"
 223
 224 /**
 225  * Load a non-algorithmic converter.
 226  * If pkg==NULL, then this function must be called inside umtx_lock(&cnvCacheMutex).
 227  */
 228 UConverterSharedData *
 229 ucnv_load(UConverterLoadArgs *pArgs, UErrorCode *err);
 230
 231 /**
 232  * Unload a non-algorithmic converter.
 233  * It must be sharedData->referenceCounter != ~0
 234  * and this function must be called inside umtx_lock(&cnvCacheMutex).
 235  */
 236 void
 237 ucnv_unload(UConverterSharedData *sharedData);
 238
 239 /**
 240  * Swap ICU .cnv conversion tables. See udataswp.h.
 241  * @internal
 242  */
 243 U_CAPI int32_t U_EXPORT2
 244 ucnv_swap(const UDataSwapper *ds,
 245           const void *inData, int32_t length, void *outData,
 246           UErrorCode *pErrorCode);
 247
 248 #endif
 249
 250 #endif /* _UCNV_BLD */