The Tor Browser: intl/icu/source/common/ucnv_bld.cpp@b8a032363ba2 (annotated)

intl/icu/source/common/ucnv_bld.cpp@b8a032363ba2 (annotated)

intl/icu/source/common/ucnv_bld.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
  ********************************************************************
  * COPYRIGHT:
  * Copyright (c) 1996-2013, International Business Machines Corporation and
  * others. All Rights Reserved.
  ********************************************************************
  *
  *  uconv_bld.cpp:
  *
  *  Defines functions that are used in the creation/initialization/deletion
  *  of converters and related structures.
  *  uses uconv_io.h routines to access disk information
  *  is used by ucnv.h to implement public API create/delete/flushCache routines
  * Modification History:
  *
  *   Date        Name        Description
  *
  *   06/20/2000  helena      OS/400 port changes; mostly typecast.
  *   06/29/2000  helena      Major rewrite of the callback interface.
 */
 #include "unicode/utypes.h"
 #if !UCONFIG_NO_CONVERSION
 #include "unicode/putil.h"
 #include "unicode/udata.h"
 #include "unicode/ucnv.h"
 #include "unicode/uloc.h"
 #include "mutex.h"
 #include "putilimp.h"
 #include "uassert.h"
 #include "utracimp.h"
 #include "ucnv_io.h"
 #include "ucnv_bld.h"
 #include "ucnvmbcs.h"
 #include "ucnv_ext.h"
 #include "ucnv_cnv.h"
 #include "ucnv_imp.h"
 #include "uhash.h"
 #include "umutex.h"
 #include "cstring.h"
 #include "cmemory.h"
 #include "ucln_cmn.h"
 #include "ustr_cnv.h"
 #if 0
 #include <stdio.h>
 extern void UCNV_DEBUG_LOG(char *what, char *who, void *p, int l);
 #define UCNV_DEBUG_LOG(x,y,z) UCNV_DEBUG_LOG(x,y,z,__LINE__)
 #else
 # define UCNV_DEBUG_LOG(x,y,z)
 #endif
 static const UConverterSharedData * const
 converterData[UCNV_NUMBER_OF_SUPPORTED_CONVERTER_TYPES]={
     NULL, NULL,
 #if UCONFIG_NO_LEGACY_CONVERSION
     NULL,
 #else
     &_MBCSData,
 #endif
     &_Latin1Data,
     &_UTF8Data, &_UTF16BEData, &_UTF16LEData, &_UTF32BEData, &_UTF32LEData,
     NULL,
 #if UCONFIG_NO_LEGACY_CONVERSION
     NULL,
     NULL, NULL, NULL, NULL, NULL, NULL,
     NULL, NULL, NULL, NULL, NULL, NULL,
     NULL,
 #else
     &_ISO2022Data,
     &_LMBCSData1,&_LMBCSData2, &_LMBCSData3, &_LMBCSData4, &_LMBCSData5, &_LMBCSData6,
     &_LMBCSData8,&_LMBCSData11,&_LMBCSData16,&_LMBCSData17,&_LMBCSData18,&_LMBCSData19,
     &_HZData,
 #endif
     &_SCSUData,
 #if UCONFIG_NO_LEGACY_CONVERSION
     NULL,
 #else
     &_ISCIIData,
 #endif
     &_ASCIIData,
     &_UTF7Data, &_Bocu1Data, &_UTF16Data, &_UTF32Data, &_CESU8Data, &_IMAPData,
 #if UCONFIG_NO_LEGACY_CONVERSION
     NULL,
 #else
     &_CompoundTextData
 #endif
 };
 /* Please keep this in binary sorted order for getAlgorithmicTypeFromName.
    Also the name should be in lower case and all spaces, dashes and underscores
    removed
 */
 static struct {
   const char *name;
   const UConverterType type;
 } const cnvNameType[] = {
   { "bocu1", UCNV_BOCU1 },
   { "cesu8", UCNV_CESU8 },
 #if !UCONFIG_NO_LEGACY_CONVERSION
   { "hz",UCNV_HZ },
 #endif
   { "imapmailboxname", UCNV_IMAP_MAILBOX },
 #if !UCONFIG_NO_LEGACY_CONVERSION
   { "iscii", UCNV_ISCII },
   { "iso2022", UCNV_ISO_2022 },
 #endif
   { "iso88591", UCNV_LATIN_1 },
 #if !UCONFIG_NO_LEGACY_CONVERSION
   { "lmbcs1", UCNV_LMBCS_1 },
   { "lmbcs11",UCNV_LMBCS_11 },
   { "lmbcs16",UCNV_LMBCS_16 },
   { "lmbcs17",UCNV_LMBCS_17 },
   { "lmbcs18",UCNV_LMBCS_18 },
   { "lmbcs19",UCNV_LMBCS_19 },
   { "lmbcs2", UCNV_LMBCS_2 },
   { "lmbcs3", UCNV_LMBCS_3 },
   { "lmbcs4", UCNV_LMBCS_4 },
   { "lmbcs5", UCNV_LMBCS_5 },
   { "lmbcs6", UCNV_LMBCS_6 },
   { "lmbcs8", UCNV_LMBCS_8 },
 #endif
   { "scsu", UCNV_SCSU },
   { "usascii", UCNV_US_ASCII },
   { "utf16", UCNV_UTF16 },
   { "utf16be", UCNV_UTF16_BigEndian },
   { "utf16le", UCNV_UTF16_LittleEndian },
 #if U_IS_BIG_ENDIAN
   { "utf16oppositeendian", UCNV_UTF16_LittleEndian },
   { "utf16platformendian", UCNV_UTF16_BigEndian },
 #else
   { "utf16oppositeendian", UCNV_UTF16_BigEndian},
   { "utf16platformendian", UCNV_UTF16_LittleEndian },
 #endif
   { "utf32", UCNV_UTF32 },
   { "utf32be", UCNV_UTF32_BigEndian },
   { "utf32le", UCNV_UTF32_LittleEndian },
 #if U_IS_BIG_ENDIAN
   { "utf32oppositeendian", UCNV_UTF32_LittleEndian },
   { "utf32platformendian", UCNV_UTF32_BigEndian },
 #else
   { "utf32oppositeendian", UCNV_UTF32_BigEndian },
   { "utf32platformendian", UCNV_UTF32_LittleEndian },
 #endif
   { "utf7", UCNV_UTF7 },
   { "utf8", UCNV_UTF8 },
   { "x11compoundtext", UCNV_COMPOUND_TEXT}
 };
 /*initializes some global variables */
 static UHashtable *SHARED_DATA_HASHTABLE = NULL;
 static UMutex cnvCacheMutex = U_MUTEX_INITIALIZER;  /* Mutex for synchronizing cnv cache access. */
                                                     /*  Note:  the global mutex is used for      */
                                                     /*         reference count updates.          */
 static const char **gAvailableConverters = NULL;
 static uint16_t gAvailableConverterCount = 0;
 static icu::UInitOnce gAvailableConvertersInitOnce = U_INITONCE_INITIALIZER;
 #if !U_CHARSET_IS_UTF8
 /* This contains the resolved converter name. So no further alias lookup is needed again. */
 static char gDefaultConverterNameBuffer[UCNV_MAX_CONVERTER_NAME_LENGTH + 1]; /* +1 for NULL */
 static const char *gDefaultConverterName = NULL;
 /*
 If the default converter is an algorithmic converter, this is the cached value.
 We don't cache a full UConverter and clone it because ucnv_clone doesn't have
 less overhead than an algorithmic open. We don't cache non-algorithmic converters
 because ucnv_flushCache must be able to unload the default converter and its table.
 */
 static const UConverterSharedData *gDefaultAlgorithmicSharedData = NULL;
 /* Does gDefaultConverterName have a converter option and require extra parsing? */
 static UBool gDefaultConverterContainsOption;
 #endif  /* !U_CHARSET_IS_UTF8 */
 static const char DATA_TYPE[] = "cnv";
 /* ucnv_flushAvailableConverterCache. This is only called from ucnv_cleanup().
  *                       If it is ever to be called from elsewhere, synchronization
  *                       will need to be considered.
  */
 static void
 ucnv_flushAvailableConverterCache() {
     gAvailableConverterCount = 0;
     if (gAvailableConverters) {
         uprv_free((char **)gAvailableConverters);
         gAvailableConverters = NULL;
     }
     gAvailableConvertersInitOnce.reset();
 }
 /* ucnv_cleanup - delete all storage held by the converter cache, except any  */
 /*                in use by open converters.                                  */
 /*                Not thread safe.                                            */
 /*                Not supported API.                                          */
 static UBool U_CALLCONV ucnv_cleanup(void) {
     ucnv_flushCache();
     if (SHARED_DATA_HASHTABLE != NULL && uhash_count(SHARED_DATA_HASHTABLE) == 0) {
         uhash_close(SHARED_DATA_HASHTABLE);
         SHARED_DATA_HASHTABLE = NULL;
     }
     /* Isn't called from flushCache because other threads may have preexisting references to the table. */
     ucnv_flushAvailableConverterCache();
 #if !U_CHARSET_IS_UTF8
     gDefaultConverterName = NULL;
     gDefaultConverterNameBuffer[0] = 0;
     gDefaultConverterContainsOption = FALSE;
     gDefaultAlgorithmicSharedData = NULL;
 #endif
     return (SHARED_DATA_HASHTABLE == NULL);
 }
 static UBool U_CALLCONV
 isCnvAcceptable(void * /*context*/,
                 const char * /*type*/, const char * /*name*/,
                 const UDataInfo *pInfo) {
     return (UBool)(
         pInfo->size>=20 &&
         pInfo->isBigEndian==U_IS_BIG_ENDIAN &&
         pInfo->charsetFamily==U_CHARSET_FAMILY &&
         pInfo->sizeofUChar==U_SIZEOF_UCHAR &&
         pInfo->dataFormat[0]==0x63 &&   /* dataFormat="cnvt" */
         pInfo->dataFormat[1]==0x6e &&
         pInfo->dataFormat[2]==0x76 &&
         pInfo->dataFormat[3]==0x74 &&
         pInfo->formatVersion[0]==6);  /* Everything will be version 6 */
 }
 /**
  * Un flatten shared data from a UDATA..
  */
 static UConverterSharedData*
 ucnv_data_unFlattenClone(UConverterLoadArgs *pArgs, UDataMemory *pData, UErrorCode *status)
 {
     /* UDataInfo info; -- necessary only if some converters have different formatVersion */
     const uint8_t *raw = (const uint8_t *)udata_getMemory(pData);
     const UConverterStaticData *source = (const UConverterStaticData *) raw;
     UConverterSharedData *data;
     UConverterType type = (UConverterType)source->conversionType;
     if(U_FAILURE(*status))
         return NULL;
     if( (uint16_t)type >= UCNV_NUMBER_OF_SUPPORTED_CONVERTER_TYPES ||
         converterData[type] == NULL ||
         converterData[type]->referenceCounter != 1 ||
         source->structSize != sizeof(UConverterStaticData))
     {
         *status = U_INVALID_TABLE_FORMAT;
         return NULL;
     }
     data = (UConverterSharedData *)uprv_malloc(sizeof(UConverterSharedData));
     if(data == NULL) {
         *status = U_MEMORY_ALLOCATION_ERROR;
         return NULL;
     }
     /* copy initial values from the static structure for this type */
     uprv_memcpy(data, converterData[type], sizeof(UConverterSharedData));
 #if 0 /* made UConverterMBCSTable part of UConverterSharedData -- markus 20031107 */
     /*
      * It would be much more efficient if the table were a direct member, not a pointer.
      * However, that would add to the size of all UConverterSharedData objects
      * even if they do not use this table (especially algorithmic ones).
      * If this changes, then the static templates from converterData[type]
      * need more entries.
      *
      * In principle, it would be cleaner if the load() function below
      * allocated the table.
      */
     data->table = (UConverterTable *)uprv_malloc(sizeof(UConverterTable));
     if(data->table == NULL) {
         uprv_free(data);
         *status = U_MEMORY_ALLOCATION_ERROR;
         return NULL;
     }
     uprv_memset(data->table, 0, sizeof(UConverterTable));
 #endif
     data->staticData = source;
     data->sharedDataCached = FALSE;
     /* fill in fields from the loaded data */
     data->dataMemory = (void*)pData; /* for future use */
     if(data->impl->load != NULL) {
         data->impl->load(data, pArgs, raw + source->structSize, status);
         if(U_FAILURE(*status)) {
             uprv_free(data->table);
             uprv_free(data);
             return NULL;
         }
     }
     return data;
 }
 /*Takes an alias name gets an actual converter file name
  *goes to disk and opens it.
  *allocates the memory and returns a new UConverter object
  */
 static UConverterSharedData *createConverterFromFile(UConverterLoadArgs *pArgs, UErrorCode * err)
 {
     UDataMemory *data;
     UConverterSharedData *sharedData;
     UTRACE_ENTRY_OC(UTRACE_UCNV_LOAD);
     if (U_FAILURE (*err)) {
         UTRACE_EXIT_STATUS(*err);
         return NULL;
     }
     UTRACE_DATA2(UTRACE_OPEN_CLOSE, "load converter %s from package %s", pArgs->name, pArgs->pkg);
     data = udata_openChoice(pArgs->pkg, DATA_TYPE, pArgs->name, isCnvAcceptable, NULL, err);
     if(U_FAILURE(*err))
     {
         UTRACE_EXIT_STATUS(*err);
         return NULL;
     }
     sharedData = ucnv_data_unFlattenClone(pArgs, data, err);
     if(U_FAILURE(*err))
     {
         udata_close(data);
         UTRACE_EXIT_STATUS(*err);
         return NULL;
     }
     /*
      * TODO Store pkg in a field in the shared data so that delta-only converters
      * can load base converters from the same package.
      * If the pkg name is longer than the field, then either do not load the converter
      * in the first place, or just set the pkg field to "".
      */
     UTRACE_EXIT_PTR_STATUS(sharedData, *err);
     return sharedData;
 }
 /*returns a converter type from a string
  */
 static const UConverterSharedData *
 getAlgorithmicTypeFromName(const char *realName)
 {
     uint32_t mid, start, limit;
     uint32_t lastMid;
     int result;
     char strippedName[UCNV_MAX_CONVERTER_NAME_LENGTH];
     /* Lower case and remove ignoreable characters. */
     ucnv_io_stripForCompare(strippedName, realName);
     /* do a binary search for the alias */
     start = 0;
     limit = sizeof(cnvNameType)/sizeof(cnvNameType[0]);
     mid = limit;
     lastMid = UINT32_MAX;
     for (;;) {
         mid = (uint32_t)((start + limit) / 2);
         if (lastMid == mid) {   /* Have we moved? */
             break;  /* We haven't moved, and it wasn't found. */
         }
         lastMid = mid;
         result = uprv_strcmp(strippedName, cnvNameType[mid].name);
         if (result < 0) {
             limit = mid;
         } else if (result > 0) {
             start = mid;
         } else {
             return converterData[cnvNameType[mid].type];
         }
     }
     return NULL;
 }
 /*
 * Based on the number of known converters, this determines how many times larger
 * the shared data hash table should be. When on small platforms, or just a couple
 * of converters are used, this number should be 2. When memory is plentiful, or
 * when ucnv_countAvailable is ever used with a lot of available converters,
 * this should be 4.
 * Larger numbers reduce the number of hash collisions, but use more memory.
 */
 #define UCNV_CACHE_LOAD_FACTOR 2
 /* Puts the shared data in the static hashtable SHARED_DATA_HASHTABLE */
 /*   Will always be called with the cnvCacheMutex alrady being held   */
 /*     by the calling function.                                       */
 /* Stores the shared data in the SHARED_DATA_HASHTABLE
  * @param data The shared data
  */
 static void
 ucnv_shareConverterData(UConverterSharedData * data)
 {
     UErrorCode err = U_ZERO_ERROR;
     /*Lazy evaluates the Hashtable itself */
     /*void *sanity = NULL;*/
     if (SHARED_DATA_HASHTABLE == NULL)
     {
         SHARED_DATA_HASHTABLE = uhash_openSize(uhash_hashChars, uhash_compareChars, NULL,
                             ucnv_io_countKnownConverters(&err)*UCNV_CACHE_LOAD_FACTOR,
                             &err);
         ucln_common_registerCleanup(UCLN_COMMON_UCNV, ucnv_cleanup);
         if (U_FAILURE(err))
             return;
     }
     /* ### check to see if the element is not already there! */
     /*
     sanity =   ucnv_getSharedConverterData (data->staticData->name);
     if(sanity != NULL)
     {
     UCNV_DEBUG_LOG("put:overwrite!",data->staticData->name,sanity);
     }
     UCNV_DEBUG_LOG("put:chk",data->staticData->name,sanity);
     */
     /* Mark it shared */
     data->sharedDataCached = TRUE;
     uhash_put(SHARED_DATA_HASHTABLE,
             (void*) data->staticData->name, /* Okay to cast away const as long as
             keyDeleter == NULL */
             data,
             &err);
     UCNV_DEBUG_LOG("put", data->staticData->name,data);
 }
 /*  Look up a converter name in the shared data cache.                    */
 /*    cnvCacheMutex must be held by the caller to protect the hash table. */
 /* gets the shared data from the SHARED_DATA_HASHTABLE (might return NULL if it isn't there)
  * @param name The name of the shared data
  * @return the shared data from the SHARED_DATA_HASHTABLE
  */
 static UConverterSharedData *
 ucnv_getSharedConverterData(const char *name)
 {
     /*special case when no Table has yet been created we return NULL */
     if (SHARED_DATA_HASHTABLE == NULL)
     {
         return NULL;
     }
     else
     {
         UConverterSharedData *rc;
         rc = (UConverterSharedData*)uhash_get(SHARED_DATA_HASHTABLE, name);
         UCNV_DEBUG_LOG("get",name,rc);
         return rc;
     }
 }
 /*frees the string of memory blocks associates with a sharedConverter
  *if and only if the referenceCounter == 0
  */
 /* Deletes (frees) the Shared data it's passed. first it checks the referenceCounter to
  * see if anyone is using it, if not it frees all the memory stemming from sharedConverterData and
  * returns TRUE,
  * otherwise returns FALSE
  * @param sharedConverterData The shared data
  * @return if not it frees all the memory stemming from sharedConverterData and
  * returns TRUE, otherwise returns FALSE
  */
 static UBool
 ucnv_deleteSharedConverterData(UConverterSharedData * deadSharedData)
 {
     UTRACE_ENTRY_OC(UTRACE_UCNV_UNLOAD);
     UTRACE_DATA2(UTRACE_OPEN_CLOSE, "unload converter %s shared data %p", deadSharedData->staticData->name, deadSharedData);
     if (deadSharedData->referenceCounter > 0) {
         UTRACE_EXIT_VALUE((int32_t)FALSE);
         return FALSE;
     }
     if (deadSharedData->impl->unload != NULL) {
         deadSharedData->impl->unload(deadSharedData);
     }
     if(deadSharedData->dataMemory != NULL)
     {
         UDataMemory *data = (UDataMemory*)deadSharedData->dataMemory;
         udata_close(data);
     }
     if(deadSharedData->table != NULL)
     {
         uprv_free(deadSharedData->table);
     }
 #if 0
     /* if the static data is actually owned by the shared data */
     /* enable if we ever have this situation. */
     if(deadSharedData->staticDataOwned == TRUE) /* see ucnv_bld.h */
     {
         uprv_free((void*)deadSharedData->staticData);
     }
 #endif
 #if 0
     /* Zap it ! */
     uprv_memset(deadSharedData->0, sizeof(*deadSharedData));
 #endif
     uprv_free(deadSharedData);
     UTRACE_EXIT_VALUE((int32_t)TRUE);
     return TRUE;
 }
 /**
  * Load a non-algorithmic converter.
  * If pkg==NULL, then this function must be called inside umtx_lock(&cnvCacheMutex).
  */
 UConverterSharedData *
 ucnv_load(UConverterLoadArgs *pArgs, UErrorCode *err) {
     UConverterSharedData *mySharedConverterData;
     if(err == NULL || U_FAILURE(*err)) {
         return NULL;
     }
     if(pArgs->pkg != NULL && *pArgs->pkg != 0) {
         /* application-provided converters are not currently cached */
         return createConverterFromFile(pArgs, err);
     }
     mySharedConverterData = ucnv_getSharedConverterData(pArgs->name);
     if (mySharedConverterData == NULL)
     {
         /*Not cached, we need to stream it in from file */
         mySharedConverterData = createConverterFromFile(pArgs, err);
         if (U_FAILURE (*err) || (mySharedConverterData == NULL))
         {
             return NULL;
         }
         else if (!pArgs->onlyTestIsLoadable)
         {
             /* share it with other library clients */
             ucnv_shareConverterData(mySharedConverterData);
         }
     }
     else
     {
         /* The data for this converter was already in the cache.            */
         /* Update the reference counter on the shared data: one more client */
         mySharedConverterData->referenceCounter++;
     }
     return mySharedConverterData;
 }
 /**
  * Unload a non-algorithmic converter.
  * It must be sharedData->referenceCounter != ~0
  * and this function must be called inside umtx_lock(&cnvCacheMutex).
  */
 U_CAPI void
 ucnv_unload(UConverterSharedData *sharedData) {
     if(sharedData != NULL) {
         if (sharedData->referenceCounter > 0) {
             sharedData->referenceCounter--;
         }
         if((sharedData->referenceCounter <= 0)&&(sharedData->sharedDataCached == FALSE)) {
             ucnv_deleteSharedConverterData(sharedData);
         }
     }
 }
 U_CFUNC void
 ucnv_unloadSharedDataIfReady(UConverterSharedData *sharedData)
 {
     /*
     Checking whether it's an algorithic converter is okay
     in multithreaded applications because the value never changes.
     Don't check referenceCounter for any other value.
     */
     if(sharedData != NULL && sharedData->referenceCounter != (uint32_t)~0) {
         umtx_lock(&cnvCacheMutex);
         ucnv_unload(sharedData);
         umtx_unlock(&cnvCacheMutex);
     }
 }
 U_CFUNC void
 ucnv_incrementRefCount(UConverterSharedData *sharedData)
 {
     /*
     Checking whether it's an algorithic converter is okay
     in multithreaded applications because the value never changes.
     Don't check referenceCounter for any other value.
     */
     if(sharedData != NULL && sharedData->referenceCounter != (uint32_t)~0) {
         umtx_lock(&cnvCacheMutex);
         sharedData->referenceCounter++;
         umtx_unlock(&cnvCacheMutex);
     }
 }
 /*
  * *pPieces must be initialized.
  * The name without options will be copied to pPieces->cnvName.
  * The locale and options will be copied to pPieces only if present in inName,
  * otherwise the existing values in pPieces remain.
  * *pArgs will be set to the pPieces values.
  */
 static void
 parseConverterOptions(const char *inName,
                       UConverterNamePieces *pPieces,
                       UConverterLoadArgs *pArgs,
                       UErrorCode *err)
 {
     char *cnvName = pPieces->cnvName;
     char c;
     int32_t len = 0;
     pArgs->name=inName;
     pArgs->locale=pPieces->locale;
     pArgs->options=pPieces->options;
     /* copy the converter name itself to cnvName */
     while((c=*inName)!=0 && c!=UCNV_OPTION_SEP_CHAR) {
         if (++len>=UCNV_MAX_CONVERTER_NAME_LENGTH) {
             *err = U_ILLEGAL_ARGUMENT_ERROR;    /* bad name */
             pPieces->cnvName[0]=0;
             return;
         }
         *cnvName++=c;
         inName++;
     }
     *cnvName=0;
     pArgs->name=pPieces->cnvName;
     /* parse options. No more name copying should occur. */
     while((c=*inName)!=0) {
         if(c==UCNV_OPTION_SEP_CHAR) {
             ++inName;
         }
         /* inName is behind an option separator */
         if(uprv_strncmp(inName, "locale=", 7)==0) {
             /* do not modify locale itself in case we have multiple locale options */
             char *dest=pPieces->locale;
             /* copy the locale option value */
             inName+=7;
             len=0;
             while((c=*inName)!=0 && c!=UCNV_OPTION_SEP_CHAR) {
                 ++inName;
                 if(++len>=ULOC_FULLNAME_CAPACITY) {
                     *err=U_ILLEGAL_ARGUMENT_ERROR;    /* bad name */
                     pPieces->locale[0]=0;
                     return;
                 }
                 *dest++=c;
             }
             *dest=0;
         } else if(uprv_strncmp(inName, "version=", 8)==0) {
             /* copy the version option value into bits 3..0 of pPieces->options */
             inName+=8;
             c=*inName;
             if(c==0) {
                 pArgs->options=(pPieces->options&=~UCNV_OPTION_VERSION);
                 return;
             } else if((uint8_t)(c-'0')<10) {
                 pArgs->options=pPieces->options=(pPieces->options&~UCNV_OPTION_VERSION)|(uint32_t)(c-'0');
                 ++inName;
             }
         } else if(uprv_strncmp(inName, "swaplfnl", 8)==0) {
             inName+=8;
             pArgs->options=(pPieces->options|=UCNV_OPTION_SWAP_LFNL);
         /* add processing for new options here with another } else if(uprv_strncmp(inName, "option-name=", XX)==0) { */
         } else {
             /* ignore any other options until we define some */
             while(((c = *inName++) != 0) && (c != UCNV_OPTION_SEP_CHAR)) {
             }
             if(c==0) {
                 return;
             }
         }
     }
 }
 /*Logic determines if the converter is Algorithmic AND/OR cached
  *depending on that:
  * -we either go to get data from disk and cache it (Data=TRUE, Cached=False)
  * -Get it from a Hashtable (Data=X, Cached=TRUE)
  * -Call dataConverter initializer (Data=TRUE, Cached=TRUE)
  * -Call AlgorithmicConverter initializer (Data=FALSE, Cached=TRUE)
  */
 U_CFUNC UConverterSharedData *
 ucnv_loadSharedData(const char *converterName,
                     UConverterNamePieces *pPieces,
                     UConverterLoadArgs *pArgs,
                     UErrorCode * err) {
     UConverterNamePieces stackPieces;
     UConverterLoadArgs stackArgs;
     UConverterSharedData *mySharedConverterData = NULL;
     UErrorCode internalErrorCode = U_ZERO_ERROR;
     UBool mayContainOption = TRUE;
     UBool checkForAlgorithmic = TRUE;
     if (U_FAILURE (*err)) {
         return NULL;
     }
     if(pPieces == NULL) {
         if(pArgs != NULL) {
             /*
              * Bad: We may set pArgs pointers to stackPieces fields
              * which will be invalid after this function returns.
              */
             *err = U_INTERNAL_PROGRAM_ERROR;
             return NULL;
         }
         pPieces = &stackPieces;
     }
     if(pArgs == NULL) {
         uprv_memset(&stackArgs, 0, sizeof(stackArgs));
         stackArgs.size = (int32_t)sizeof(stackArgs);
         pArgs = &stackArgs;
     }
     pPieces->cnvName[0] = 0;
     pPieces->locale[0] = 0;
     pPieces->options = 0;
     pArgs->name = converterName;
     pArgs->locale = pPieces->locale;
     pArgs->options = pPieces->options;
     /* In case "name" is NULL we want to open the default converter. */
     if (converterName == NULL) {
 #if U_CHARSET_IS_UTF8
         pArgs->name = "UTF-8";
         return (UConverterSharedData *)converterData[UCNV_UTF8];
 #else
         /* Call ucnv_getDefaultName first to query the name from the OS. */
         pArgs->name = ucnv_getDefaultName();
         if (pArgs->name == NULL) {
             *err = U_MISSING_RESOURCE_ERROR;
             return NULL;
         }
         mySharedConverterData = (UConverterSharedData *)gDefaultAlgorithmicSharedData;
         checkForAlgorithmic = FALSE;
         mayContainOption = gDefaultConverterContainsOption;
         /* the default converter name is already canonical */
 #endif
     }
     else if(UCNV_FAST_IS_UTF8(converterName)) {
         /* fastpath for UTF-8 */
         pArgs->name = "UTF-8";
         return (UConverterSharedData *)converterData[UCNV_UTF8];
     }
     else {
         /* separate the converter name from the options */
         parseConverterOptions(converterName, pPieces, pArgs, err);
         if (U_FAILURE(*err)) {
             /* Very bad name used. */
             return NULL;
         }
         /* get the canonical converter name */
         pArgs->name = ucnv_io_getConverterName(pArgs->name, &mayContainOption, &internalErrorCode);
         if (U_FAILURE(internalErrorCode) || pArgs->name == NULL) {
             /*
             * set the input name in case the converter was added
             * without updating the alias table, or when there is no alias table
             */
             pArgs->name = pPieces->cnvName;
         } else if (internalErrorCode == U_AMBIGUOUS_ALIAS_WARNING) {
             *err = U_AMBIGUOUS_ALIAS_WARNING;
         }
     }
     /* separate the converter name from the options */
     if(mayContainOption && pArgs->name != pPieces->cnvName) {
         parseConverterOptions(pArgs->name, pPieces, pArgs, err);
     }
     /* get the shared data for an algorithmic converter, if it is one */
     if (checkForAlgorithmic) {
         mySharedConverterData = (UConverterSharedData *)getAlgorithmicTypeFromName(pArgs->name);
     }
     if (mySharedConverterData == NULL)
     {
         /* it is a data-based converter, get its shared data.               */
         /* Hold the cnvCacheMutex through the whole process of checking the */
         /*   converter data cache, and adding new entries to the cache      */
         /*   to prevent other threads from modifying the cache during the   */
         /*   process.                                                       */
         pArgs->nestedLoads=1;
         pArgs->pkg=NULL;
         umtx_lock(&cnvCacheMutex);
         mySharedConverterData = ucnv_load(pArgs, err);
         umtx_unlock(&cnvCacheMutex);
         if (U_FAILURE (*err) || (mySharedConverterData == NULL))
         {
             return NULL;
         }
     }
     return mySharedConverterData;
 }
 U_CAPI UConverter *
 ucnv_createConverter(UConverter *myUConverter, const char *converterName, UErrorCode * err)
 {
     UConverterNamePieces stackPieces;
     UConverterLoadArgs stackArgs=UCNV_LOAD_ARGS_INITIALIZER;
     UConverterSharedData *mySharedConverterData;
     UTRACE_ENTRY_OC(UTRACE_UCNV_OPEN);
     if(U_SUCCESS(*err)) {
         UTRACE_DATA1(UTRACE_OPEN_CLOSE, "open converter %s", converterName);
         mySharedConverterData = ucnv_loadSharedData(converterName, &stackPieces, &stackArgs, err);
         myUConverter = ucnv_createConverterFromSharedData(
             myUConverter, mySharedConverterData,
             &stackArgs,
             err);
         if(U_SUCCESS(*err)) {
             UTRACE_EXIT_PTR_STATUS(myUConverter, *err);
             return myUConverter;
         }
     }
     /* exit with error */
     UTRACE_EXIT_STATUS(*err);
     return NULL;
 }
 U_CFUNC UBool
 ucnv_canCreateConverter(const char *converterName, UErrorCode *err) {
     UConverter myUConverter;
     UConverterNamePieces stackPieces;
     UConverterLoadArgs stackArgs=UCNV_LOAD_ARGS_INITIALIZER;
     UConverterSharedData *mySharedConverterData;
     UTRACE_ENTRY_OC(UTRACE_UCNV_OPEN);
     if(U_SUCCESS(*err)) {
         UTRACE_DATA1(UTRACE_OPEN_CLOSE, "test if can open converter %s", converterName);
         stackArgs.onlyTestIsLoadable=TRUE;
         mySharedConverterData = ucnv_loadSharedData(converterName, &stackPieces, &stackArgs, err);
         ucnv_createConverterFromSharedData(
             &myUConverter, mySharedConverterData,
             &stackArgs,
             err);
         ucnv_unloadSharedDataIfReady(mySharedConverterData);
     }
     UTRACE_EXIT_STATUS(*err);
     return U_SUCCESS(*err);
 }
 UConverter *
 ucnv_createAlgorithmicConverter(UConverter *myUConverter,
                                 UConverterType type,
                                 const char *locale, uint32_t options,
                                 UErrorCode *err) {
     UConverter *cnv;
     const UConverterSharedData *sharedData;
     UConverterLoadArgs stackArgs=UCNV_LOAD_ARGS_INITIALIZER;
     UTRACE_ENTRY_OC(UTRACE_UCNV_OPEN_ALGORITHMIC);
     UTRACE_DATA1(UTRACE_OPEN_CLOSE, "open algorithmic converter type %d", (int32_t)type);
     if(type<0 || UCNV_NUMBER_OF_SUPPORTED_CONVERTER_TYPES<=type) {
         *err = U_ILLEGAL_ARGUMENT_ERROR;
         UTRACE_EXIT_STATUS(U_ILLEGAL_ARGUMENT_ERROR);
         return NULL;
     }
     sharedData = converterData[type];
     /*
     Checking whether it's an algorithic converter is okay
     in multithreaded applications because the value never changes.
     Don't check referenceCounter for any other value.
     */
     if(sharedData == NULL || sharedData->referenceCounter != (uint32_t)~0) {
         /* not a valid type, or not an algorithmic converter */
         *err = U_ILLEGAL_ARGUMENT_ERROR;
         UTRACE_EXIT_STATUS(U_ILLEGAL_ARGUMENT_ERROR);
         return NULL;
     }
     stackArgs.name = "";
     stackArgs.options = options;
     stackArgs.locale=locale;
     cnv = ucnv_createConverterFromSharedData(
             myUConverter, (UConverterSharedData *)sharedData,
             &stackArgs, err);
     UTRACE_EXIT_PTR_STATUS(cnv, *err);
     return cnv;
 }
 U_CFUNC UConverter*
 ucnv_createConverterFromPackage(const char *packageName, const char *converterName, UErrorCode * err)
 {
     UConverter *myUConverter;
     UConverterSharedData *mySharedConverterData;
     UConverterNamePieces stackPieces;
     UConverterLoadArgs stackArgs=UCNV_LOAD_ARGS_INITIALIZER;
     UTRACE_ENTRY_OC(UTRACE_UCNV_OPEN_PACKAGE);
     if(U_FAILURE(*err)) {
         UTRACE_EXIT_STATUS(*err);
         return NULL;
     }
     UTRACE_DATA2(UTRACE_OPEN_CLOSE, "open converter %s from package %s", converterName, packageName);
     /* first, get the options out of the converterName string */
     stackPieces.cnvName[0] = 0;
     stackPieces.locale[0] = 0;
     stackPieces.options = 0;
     parseConverterOptions(converterName, &stackPieces, &stackArgs, err);
     if (U_FAILURE(*err)) {
         /* Very bad name used. */
         UTRACE_EXIT_STATUS(*err);
         return NULL;
     }
     stackArgs.nestedLoads=1;
     stackArgs.pkg=packageName;
     /* open the data, unflatten the shared structure */
     mySharedConverterData = createConverterFromFile(&stackArgs, err);
     if (U_FAILURE(*err)) {
         UTRACE_EXIT_STATUS(*err);
         return NULL;
     }
     /* create the actual converter */
     myUConverter = ucnv_createConverterFromSharedData(NULL, mySharedConverterData, &stackArgs, err);
     if (U_FAILURE(*err)) {
         ucnv_close(myUConverter);
         UTRACE_EXIT_STATUS(*err);
         return NULL;
     }
     UTRACE_EXIT_PTR_STATUS(myUConverter, *err);
     return myUConverter;
 }
 U_CFUNC UConverter*
 ucnv_createConverterFromSharedData(UConverter *myUConverter,
                                    UConverterSharedData *mySharedConverterData,
                                    UConverterLoadArgs *pArgs,
                                    UErrorCode *err)
 {
     UBool isCopyLocal;
     if(U_FAILURE(*err)) {
         ucnv_unloadSharedDataIfReady(mySharedConverterData);
         return myUConverter;
     }
     if(myUConverter == NULL)
     {
         myUConverter = (UConverter *) uprv_malloc (sizeof (UConverter));
         if(myUConverter == NULL)
         {
             *err = U_MEMORY_ALLOCATION_ERROR;
             ucnv_unloadSharedDataIfReady(mySharedConverterData);
             return NULL;
         }
         isCopyLocal = FALSE;
     } else {
         isCopyLocal = TRUE;
     }
     /* initialize the converter */
     uprv_memset(myUConverter, 0, sizeof(UConverter));
     myUConverter->isCopyLocal = isCopyLocal;
     /*myUConverter->isExtraLocal = FALSE;*/ /* Set by the memset call */
     myUConverter->sharedData = mySharedConverterData;
     myUConverter->options = pArgs->options;
     if(!pArgs->onlyTestIsLoadable) {
         myUConverter->preFromUFirstCP = U_SENTINEL;
         myUConverter->fromCharErrorBehaviour = UCNV_TO_U_DEFAULT_CALLBACK;
         myUConverter->fromUCharErrorBehaviour = UCNV_FROM_U_DEFAULT_CALLBACK;
         myUConverter->toUnicodeStatus = mySharedConverterData->toUnicodeStatus;
         myUConverter->maxBytesPerUChar = mySharedConverterData->staticData->maxBytesPerChar;
         myUConverter->subChar1 = mySharedConverterData->staticData->subChar1;
         myUConverter->subCharLen = mySharedConverterData->staticData->subCharLen;
         myUConverter->subChars = (uint8_t *)myUConverter->subUChars;
         uprv_memcpy(myUConverter->subChars, mySharedConverterData->staticData->subChar, myUConverter->subCharLen);
         myUConverter->toUCallbackReason = UCNV_ILLEGAL; /* default reason to invoke (*fromCharErrorBehaviour) */
     }
     if(mySharedConverterData->impl->open != NULL) {
         mySharedConverterData->impl->open(myUConverter, pArgs, err);
         if(U_FAILURE(*err) && !pArgs->onlyTestIsLoadable) {
             /* don't ucnv_close() if onlyTestIsLoadable because not fully initialized */
             ucnv_close(myUConverter);
             return NULL;
         }
     }
     return myUConverter;
 }
 /*Frees all shared immutable objects that aren't referred to (reference count = 0)
  */
 U_CAPI int32_t U_EXPORT2
 ucnv_flushCache ()
 {
     UConverterSharedData *mySharedData = NULL;
     int32_t pos;
     int32_t tableDeletedNum = 0;
     const UHashElement *e;
     /*UErrorCode status = U_ILLEGAL_ARGUMENT_ERROR;*/
     int32_t i, remaining;
     UTRACE_ENTRY_OC(UTRACE_UCNV_FLUSH_CACHE);
     /* Close the default converter without creating a new one so that everything will be flushed. */
     u_flushDefaultConverter();
     /*if shared data hasn't even been lazy evaluated yet
     * return 0
     */
     if (SHARED_DATA_HASHTABLE == NULL) {
         UTRACE_EXIT_VALUE((int32_t)0);
         return 0;
     }
     /*creates an enumeration to iterate through every element in the
     * table
     *
     * Synchronization:  holding cnvCacheMutex will prevent any other thread from
     *                   accessing or modifying the hash table during the iteration.
     *                   The reference count of an entry may be decremented by
     *                   ucnv_close while the iteration is in process, but this is
     *                   benign.  It can't be incremented (in ucnv_createConverter())
     *                   because the sequence of looking up in the cache + incrementing
     *                   is protected by cnvCacheMutex.
     */
     umtx_lock(&cnvCacheMutex);
     /*
      * double loop: A delta/extension-only converter has a pointer to its base table's
      * shared data; the first iteration of the outer loop may see the delta converter
      * before the base converter, and unloading the delta converter may get the base
      * converter's reference counter down to 0.
      */
     i = 0;
     do {
         remaining = 0;
         pos = -1;
         while ((e = uhash_nextElement (SHARED_DATA_HASHTABLE, &pos)) != NULL)
         {
             mySharedData = (UConverterSharedData *) e->value.pointer;
             /*deletes only if reference counter == 0 */
             if (mySharedData->referenceCounter == 0)
             {
                 tableDeletedNum++;
                 UCNV_DEBUG_LOG("del",mySharedData->staticData->name,mySharedData);
                 uhash_removeElement(SHARED_DATA_HASHTABLE, e);
                 mySharedData->sharedDataCached = FALSE;
                 ucnv_deleteSharedConverterData (mySharedData);
             } else {
                 ++remaining;
             }
         }
     } while(++i == 1 && remaining > 0);
     umtx_unlock(&cnvCacheMutex);
     UTRACE_DATA1(UTRACE_INFO, "ucnv_flushCache() exits with %d converters remaining", remaining);
     UTRACE_EXIT_VALUE(tableDeletedNum);
     return tableDeletedNum;
 }
 /* available converters list --------------------------------------------------- */
 static void U_CALLCONV initAvailableConvertersList(UErrorCode &errCode) {
     U_ASSERT(gAvailableConverterCount == 0);
     U_ASSERT(gAvailableConverters == NULL);
     ucln_common_registerCleanup(UCLN_COMMON_UCNV, ucnv_cleanup);
     UEnumeration *allConvEnum = ucnv_openAllNames(&errCode);
     int32_t allConverterCount = uenum_count(allConvEnum, &errCode);
     if (U_FAILURE(errCode)) {
         return;
     }
     /* We can't have more than "*converterTable" converters to open */
     gAvailableConverters = (const char **) uprv_malloc(allConverterCount * sizeof(char*));
     if (!gAvailableConverters) {
         errCode = U_MEMORY_ALLOCATION_ERROR;
         return;
     }
     /* Open the default converter to make sure that it has first dibs in the hash table. */
     UErrorCode localStatus = U_ZERO_ERROR;
     UConverter tempConverter;
     ucnv_close(ucnv_createConverter(&tempConverter, NULL, &localStatus));
     gAvailableConverterCount = 0;
     for (int32_t idx = 0; idx < allConverterCount; idx++) {
         localStatus = U_ZERO_ERROR;
         const char *converterName = uenum_next(allConvEnum, NULL, &localStatus);
         if (ucnv_canCreateConverter(converterName, &localStatus)) {
             gAvailableConverters[gAvailableConverterCount++] = converterName;
         }
     }
     uenum_close(allConvEnum);
 }
 static UBool haveAvailableConverterList(UErrorCode *pErrorCode) {
     umtx_initOnce(gAvailableConvertersInitOnce, &initAvailableConvertersList, *pErrorCode);
     return U_SUCCESS(*pErrorCode);
 }
 U_CFUNC uint16_t
 ucnv_bld_countAvailableConverters(UErrorCode *pErrorCode) {
     if (haveAvailableConverterList(pErrorCode)) {
         return gAvailableConverterCount;
     }
     return 0;
 }
 U_CFUNC const char *
 ucnv_bld_getAvailableConverter(uint16_t n, UErrorCode *pErrorCode) {
     if (haveAvailableConverterList(pErrorCode)) {
         if (n < gAvailableConverterCount) {
             return gAvailableConverters[n];
         }
         *pErrorCode = U_INDEX_OUTOFBOUNDS_ERROR;
     }
     return NULL;
 }
 /* default converter name --------------------------------------------------- */
 #if !U_CHARSET_IS_UTF8
 /*
 Copy the canonical converter name.
 ucnv_getDefaultName must be thread safe, which can call this function.
 ucnv_setDefaultName calls this function and it doesn't have to be
 thread safe because there is no reliable/safe way to reset the
 converter in use in all threads. If you did reset the converter, you
 would not be sure that retrieving a default converter for one string
 would be the same type of default converter for a successive string.
 Since the name is a returned via ucnv_getDefaultName without copying,
 you shouldn't be modifying or deleting the string from a separate thread.
 */
 static inline void
 internalSetName(const char *name, UErrorCode *status) {
     UConverterNamePieces stackPieces;
     UConverterLoadArgs stackArgs=UCNV_LOAD_ARGS_INITIALIZER;
     int32_t length=(int32_t)(uprv_strlen(name));
     UBool containsOption = (UBool)(uprv_strchr(name, UCNV_OPTION_SEP_CHAR) != NULL);
     const UConverterSharedData *algorithmicSharedData;
     stackArgs.name = name;
     if(containsOption) {
         stackPieces.cnvName[0] = 0;
         stackPieces.locale[0] = 0;
         stackPieces.options = 0;
         parseConverterOptions(name, &stackPieces, &stackArgs, status);
         if(U_FAILURE(*status)) {
             return;
         }
     }
     algorithmicSharedData = getAlgorithmicTypeFromName(stackArgs.name);
     umtx_lock(&cnvCacheMutex);
     gDefaultAlgorithmicSharedData = algorithmicSharedData;
     gDefaultConverterContainsOption = containsOption;
     uprv_memcpy(gDefaultConverterNameBuffer, name, length);
     gDefaultConverterNameBuffer[length]=0;
     /* gDefaultConverterName MUST be the last global var set by this function.  */
     /*    It is the variable checked in ucnv_getDefaultName() to see if initialization is required. */
     //    But there is nothing here preventing that from being reordered, either by the compiler
     //             or hardware. I'm adding the mutex to ucnv_getDefaultName for now. UMTX_CHECK is not enough.
     //             -- Andy
     gDefaultConverterName = gDefaultConverterNameBuffer;
     ucln_common_registerCleanup(UCLN_COMMON_UCNV, ucnv_cleanup);
     umtx_unlock(&cnvCacheMutex);
 }
 #endif
 /*
  * In order to be really thread-safe, the get function would have to take
  * a buffer parameter and copy the current string inside a mutex block.
  * This implementation only tries to be really thread-safe while
  * setting the name.
  * It assumes that setting a pointer is atomic.
  */
 U_CAPI const char*  U_EXPORT2
 ucnv_getDefaultName() {
 #if U_CHARSET_IS_UTF8
     return "UTF-8";
 #else
     /* local variable to be thread-safe */
     const char *name;
     /*
     Concurrent calls to ucnv_getDefaultName must be thread safe,
     but ucnv_setDefaultName is not thread safe.
     */
     {
         icu::Mutex lock(&cnvCacheMutex);
         name = gDefaultConverterName;
     }
     if(name==NULL) {
         UErrorCode errorCode = U_ZERO_ERROR;
         UConverter *cnv = NULL;
         name = uprv_getDefaultCodepage();
         /* if the name is there, test it out and get the canonical name with options */
         if(name != NULL) {
             cnv = ucnv_open(name, &errorCode);
             if(U_SUCCESS(errorCode) && cnv != NULL) {
                 name = ucnv_getName(cnv, &errorCode);
             }
         }
         if(name == NULL || name[0] == 0
             || U_FAILURE(errorCode) || cnv == NULL
             || uprv_strlen(name)>=sizeof(gDefaultConverterNameBuffer))
         {
             /* Panic time, let's use a fallback. */
 #if (U_CHARSET_FAMILY == U_ASCII_FAMILY)
             name = "US-ASCII";
             /* there is no 'algorithmic' converter for EBCDIC */
 #elif U_PLATFORM == U_PF_OS390
             name = "ibm-1047_P100-1995" UCNV_SWAP_LFNL_OPTION_STRING;
 #else
             name = "ibm-37_P100-1995";
 #endif
         }
         internalSetName(name, &errorCode);
         /* The close may make the current name go away. */
         ucnv_close(cnv);
     }
     return name;
 #endif
 }
 #if U_CHARSET_IS_UTF8
 U_CAPI void U_EXPORT2 ucnv_setDefaultName(const char *) {}
 #else
 /*
 This function is not thread safe, and it can't be thread safe.
 See internalSetName or the API reference for details.
 */
 U_CAPI void U_EXPORT2
 ucnv_setDefaultName(const char *converterName) {
     if(converterName==NULL) {
         /* reset to the default codepage */
         gDefaultConverterName=NULL;
     } else {
         UErrorCode errorCode = U_ZERO_ERROR;
         UConverter *cnv = NULL;
         const char *name = NULL;
         /* if the name is there, test it out and get the canonical name with options */
         cnv = ucnv_open(converterName, &errorCode);
         if(U_SUCCESS(errorCode) && cnv != NULL) {
             name = ucnv_getName(cnv, &errorCode);
         }
         if(U_SUCCESS(errorCode) && name!=NULL) {
             internalSetName(name, &errorCode);
         }
         /* else this converter is bad to use. Don't change it to a bad value. */
         /* The close may make the current name go away. */
         ucnv_close(cnv);
         /* reset the converter cache */
         u_flushDefaultConverter();
     }
 }
 #endif
 /* data swapping ------------------------------------------------------------ */
 /* most of this might belong more properly into ucnvmbcs.c, but that is so large */
 #if !UCONFIG_NO_LEGACY_CONVERSION
 U_CAPI int32_t U_EXPORT2
 ucnv_swap(const UDataSwapper *ds,
           const void *inData, int32_t length, void *outData,
           UErrorCode *pErrorCode) {
     const UDataInfo *pInfo;
     int32_t headerSize;
     const uint8_t *inBytes;
     uint8_t *outBytes;
     uint32_t offset, count, staticDataSize;
     int32_t size;
     const UConverterStaticData *inStaticData;
     UConverterStaticData *outStaticData;
     const _MBCSHeader *inMBCSHeader;
     _MBCSHeader *outMBCSHeader;
     _MBCSHeader mbcsHeader;
     uint32_t mbcsHeaderLength;
     UBool noFromU=FALSE;
     uint8_t outputType;
     int32_t maxFastUChar, mbcsIndexLength;
     const int32_t *inExtIndexes;
     int32_t extOffset;
     /* udata_swapDataHeader checks the arguments */
     headerSize=udata_swapDataHeader(ds, inData, length, outData, pErrorCode);
     if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
         return 0;
     }
     /* check data format and format version */
     pInfo=(const UDataInfo *)((const char *)inData+4);
     if(!(
         pInfo->dataFormat[0]==0x63 &&   /* dataFormat="cnvt" */
         pInfo->dataFormat[1]==0x6e &&
         pInfo->dataFormat[2]==0x76 &&
         pInfo->dataFormat[3]==0x74 &&
         pInfo->formatVersion[0]==6 &&
         pInfo->formatVersion[1]>=2
     )) {
         udata_printError(ds, "ucnv_swap(): data format %02x.%02x.%02x.%02x (format version %02x.%02x) is not recognized as an ICU .cnv conversion table\n",
                          pInfo->dataFormat[0], pInfo->dataFormat[1],
                          pInfo->dataFormat[2], pInfo->dataFormat[3],
                          pInfo->formatVersion[0], pInfo->formatVersion[1]);
         *pErrorCode=U_UNSUPPORTED_ERROR;
         return 0;
     }
     inBytes=(const uint8_t *)inData+headerSize;
     outBytes=(uint8_t *)outData+headerSize;
     /* read the initial UConverterStaticData structure after the UDataInfo header */
     inStaticData=(const UConverterStaticData *)inBytes;
     outStaticData=(UConverterStaticData *)outBytes;
     if(length<0) {
         staticDataSize=ds->readUInt32(inStaticData->structSize);
     } else {
         length-=headerSize;
         if( length<(int32_t)sizeof(UConverterStaticData) ||
             (uint32_t)length<(staticDataSize=ds->readUInt32(inStaticData->structSize))
         ) {
             udata_printError(ds, "ucnv_swap(): too few bytes (%d after header) for an ICU .cnv conversion table\n",
                              length);
             *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
             return 0;
         }
     }
     if(length>=0) {
         /* swap the static data */
         if(inStaticData!=outStaticData) {
             uprv_memcpy(outStaticData, inStaticData, staticDataSize);
         }
         ds->swapArray32(ds, &inStaticData->structSize, 4,
                            &outStaticData->structSize, pErrorCode);
         ds->swapArray32(ds, &inStaticData->codepage, 4,
                            &outStaticData->codepage, pErrorCode);
         ds->swapInvChars(ds, inStaticData->name, (int32_t)uprv_strlen(inStaticData->name),
                             outStaticData->name, pErrorCode);
         if(U_FAILURE(*pErrorCode)) {
             udata_printError(ds, "ucnv_swap(): error swapping converter name\n");
             return 0;
         }
     }
     inBytes+=staticDataSize;
     outBytes+=staticDataSize;
     if(length>=0) {
         length-=(int32_t)staticDataSize;
     }
     /* check for supported conversionType values */
     if(inStaticData->conversionType==UCNV_MBCS) {
         /* swap MBCS data */
         inMBCSHeader=(const _MBCSHeader *)inBytes;
         outMBCSHeader=(_MBCSHeader *)outBytes;
         if(0<=length && length<(int32_t)sizeof(_MBCSHeader)) {
             udata_printError(ds, "ucnv_swap(): too few bytes (%d after headers) for an ICU MBCS .cnv conversion table\n",
                                 length);
             *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
             return 0;
         }
         if(inMBCSHeader->version[0]==4 && inMBCSHeader->version[1]>=1) {
             mbcsHeaderLength=MBCS_HEADER_V4_LENGTH;
         } else if(inMBCSHeader->version[0]==5 && inMBCSHeader->version[1]>=3 &&
                   ((mbcsHeader.options=ds->readUInt32(inMBCSHeader->options))&
                    MBCS_OPT_UNKNOWN_INCOMPATIBLE_MASK)==0
         ) {
             mbcsHeaderLength=mbcsHeader.options&MBCS_OPT_LENGTH_MASK;
             noFromU=(UBool)((mbcsHeader.options&MBCS_OPT_NO_FROM_U)!=0);
         } else {
             udata_printError(ds, "ucnv_swap(): unsupported _MBCSHeader.version %d.%d\n",
                              inMBCSHeader->version[0], inMBCSHeader->version[1]);
             *pErrorCode=U_UNSUPPORTED_ERROR;
             return 0;
         }
         uprv_memcpy(mbcsHeader.version, inMBCSHeader->version, 4);
         mbcsHeader.countStates=         ds->readUInt32(inMBCSHeader->countStates);
         mbcsHeader.countToUFallbacks=   ds->readUInt32(inMBCSHeader->countToUFallbacks);
         mbcsHeader.offsetToUCodeUnits=  ds->readUInt32(inMBCSHeader->offsetToUCodeUnits);
         mbcsHeader.offsetFromUTable=    ds->readUInt32(inMBCSHeader->offsetFromUTable);
         mbcsHeader.offsetFromUBytes=    ds->readUInt32(inMBCSHeader->offsetFromUBytes);
         mbcsHeader.flags=               ds->readUInt32(inMBCSHeader->flags);
         mbcsHeader.fromUBytesLength=    ds->readUInt32(inMBCSHeader->fromUBytesLength);
         /* mbcsHeader.options have been read above */
         extOffset=(int32_t)(mbcsHeader.flags>>8);
         outputType=(uint8_t)mbcsHeader.flags;
         if(noFromU && outputType==MBCS_OUTPUT_1) {
             udata_printError(ds, "ucnv_swap(): unsupported combination of makeconv --small with SBCS\n");
             *pErrorCode=U_UNSUPPORTED_ERROR;
             return 0;
         }
         /* make sure that the output type is known */
         switch(outputType) {
         case MBCS_OUTPUT_1:
         case MBCS_OUTPUT_2:
         case MBCS_OUTPUT_3:
         case MBCS_OUTPUT_4:
         case MBCS_OUTPUT_3_EUC:
         case MBCS_OUTPUT_4_EUC:
         case MBCS_OUTPUT_2_SISO:
         case MBCS_OUTPUT_EXT_ONLY:
             /* OK */
             break;
         default:
             udata_printError(ds, "ucnv_swap(): unsupported MBCS output type 0x%x\n",
                              outputType);
             *pErrorCode=U_UNSUPPORTED_ERROR;
             return 0;
         }
         /* calculate the length of the MBCS data */
         /*
          * utf8Friendly MBCS files (mbcsHeader.version 4.3)
          * contain an additional mbcsIndex table:
          *   uint16_t[(maxFastUChar+1)>>6];
          * where maxFastUChar=((mbcsHeader.version[2]<<8)|0xff).
          */
         maxFastUChar=0;
         mbcsIndexLength=0;
         if( outputType!=MBCS_OUTPUT_EXT_ONLY && outputType!=MBCS_OUTPUT_1 &&
             mbcsHeader.version[1]>=3 && (maxFastUChar=mbcsHeader.version[2])!=0
         ) {
             maxFastUChar=(maxFastUChar<<8)|0xff;
             mbcsIndexLength=((maxFastUChar+1)>>6)*2;  /* number of bytes */
         }
         if(extOffset==0) {
             size=(int32_t)(mbcsHeader.offsetFromUBytes+mbcsIndexLength);
             if(!noFromU) {
                 size+=(int32_t)mbcsHeader.fromUBytesLength;
             }
             /* avoid compiler warnings - not otherwise necessary, and the value does not matter */
             inExtIndexes=NULL;
         } else {
             /* there is extension data after the base data, see ucnv_ext.h */
             if(length>=0 && length<(extOffset+UCNV_EXT_INDEXES_MIN_LENGTH*4)) {
                 udata_printError(ds, "ucnv_swap(): too few bytes (%d after headers) for an ICU MBCS .cnv conversion table with extension data\n",
                                  length);
                 *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
                 return 0;
             }
             inExtIndexes=(const int32_t *)(inBytes+extOffset);
             size=extOffset+udata_readInt32(ds, inExtIndexes[UCNV_EXT_SIZE]);
         }
         if(length>=0) {
             if(length<size) {
                 udata_printError(ds, "ucnv_swap(): too few bytes (%d after headers) for an ICU MBCS .cnv conversion table\n",
                                  length);
                 *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
                 return 0;
             }
             /* copy the data for inaccessible bytes */
             if(inBytes!=outBytes) {
                 uprv_memcpy(outBytes, inBytes, size);
             }
             /* swap the MBCSHeader, except for the version field */
             count=mbcsHeaderLength*4;
             ds->swapArray32(ds, &inMBCSHeader->countStates, count-4,
                                &outMBCSHeader->countStates, pErrorCode);
             if(outputType==MBCS_OUTPUT_EXT_ONLY) {
                 /*
                  * extension-only file,
                  * contains a base name instead of normal base table data
                  */
                 /* swap the base name, between the header and the extension data */
                 const char *inBaseName=(const char *)inBytes+count;
                 char *outBaseName=(char *)outBytes+count;
                 ds->swapInvChars(ds, inBaseName, (int32_t)uprv_strlen(inBaseName),
                                     outBaseName, pErrorCode);
             } else {
                 /* normal file with base table data */
                 /* swap the state table, 1kB per state */
                 offset=count;
                 count=mbcsHeader.countStates*1024;
                 ds->swapArray32(ds, inBytes+offset, (int32_t)count,
                                    outBytes+offset, pErrorCode);
                 /* swap the toUFallbacks[] */
                 offset+=count;
                 count=mbcsHeader.countToUFallbacks*8;
                 ds->swapArray32(ds, inBytes+offset, (int32_t)count,
                                    outBytes+offset, pErrorCode);
                 /* swap the unicodeCodeUnits[] */
                 offset=mbcsHeader.offsetToUCodeUnits;
                 count=mbcsHeader.offsetFromUTable-offset;
                 ds->swapArray16(ds, inBytes+offset, (int32_t)count,
                                    outBytes+offset, pErrorCode);
                 /* offset to the stage 1 table, independent of the outputType */
                 offset=mbcsHeader.offsetFromUTable;
                 if(outputType==MBCS_OUTPUT_1) {
                     /* SBCS: swap the fromU tables, all 16 bits wide */
                     count=(mbcsHeader.offsetFromUBytes-offset)+mbcsHeader.fromUBytesLength;
                     ds->swapArray16(ds, inBytes+offset, (int32_t)count,
                                        outBytes+offset, pErrorCode);
                 } else {
                     /* otherwise: swap the stage tables separately */
                     /* stage 1 table: uint16_t[0x440 or 0x40] */
                     if(inStaticData->unicodeMask&UCNV_HAS_SUPPLEMENTARY) {
                         count=0x440*2; /* for all of Unicode */
                     } else {
                         count=0x40*2; /* only BMP */
                     }
                     ds->swapArray16(ds, inBytes+offset, (int32_t)count,
                                        outBytes+offset, pErrorCode);
                     /* stage 2 table: uint32_t[] */
                     offset+=count;
                     count=mbcsHeader.offsetFromUBytes-offset;
                     ds->swapArray32(ds, inBytes+offset, (int32_t)count,
                                        outBytes+offset, pErrorCode);
                     /* stage 3/result bytes: sometimes uint16_t[] or uint32_t[] */
                     offset=mbcsHeader.offsetFromUBytes;
                     count= noFromU ? 0 : mbcsHeader.fromUBytesLength;
                     switch(outputType) {
                     case MBCS_OUTPUT_2:
                     case MBCS_OUTPUT_3_EUC:
                     case MBCS_OUTPUT_2_SISO:
                         ds->swapArray16(ds, inBytes+offset, (int32_t)count,
                                            outBytes+offset, pErrorCode);
                         break;
                     case MBCS_OUTPUT_4:
                         ds->swapArray32(ds, inBytes+offset, (int32_t)count,
                                            outBytes+offset, pErrorCode);
                         break;
                     default:
                         /* just uint8_t[], nothing to swap */
                         break;
                     }
                     if(mbcsIndexLength!=0) {
                         offset+=count;
                         count=mbcsIndexLength;
                         ds->swapArray16(ds, inBytes+offset, (int32_t)count,
                                            outBytes+offset, pErrorCode);
                     }
                 }
             }
             if(extOffset!=0) {
                 /* swap the extension data */
                 inBytes+=extOffset;
                 outBytes+=extOffset;
                 /* swap toUTable[] */
                 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_TO_U_INDEX]);
                 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_TO_U_LENGTH]);
                 ds->swapArray32(ds, inBytes+offset, length*4, outBytes+offset, pErrorCode);
                 /* swap toUUChars[] */
                 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_TO_U_UCHARS_INDEX]);
                 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_TO_U_UCHARS_LENGTH]);
                 ds->swapArray16(ds, inBytes+offset, length*2, outBytes+offset, pErrorCode);
                 /* swap fromUTableUChars[] */
                 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_UCHARS_INDEX]);
                 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_LENGTH]);
                 ds->swapArray16(ds, inBytes+offset, length*2, outBytes+offset, pErrorCode);
                 /* swap fromUTableValues[] */
                 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_VALUES_INDEX]);
                 /* same length as for fromUTableUChars[] */
                 ds->swapArray32(ds, inBytes+offset, length*4, outBytes+offset, pErrorCode);
                 /* no need to swap fromUBytes[] */
                 /* swap fromUStage12[] */
                 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_STAGE_12_INDEX]);
                 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_STAGE_12_LENGTH]);
                 ds->swapArray16(ds, inBytes+offset, length*2, outBytes+offset, pErrorCode);
                 /* swap fromUStage3[] */
                 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_STAGE_3_INDEX]);
                 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_STAGE_3_LENGTH]);
                 ds->swapArray16(ds, inBytes+offset, length*2, outBytes+offset, pErrorCode);
                 /* swap fromUStage3b[] */
                 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_STAGE_3B_INDEX]);
                 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_STAGE_3B_LENGTH]);
                 ds->swapArray32(ds, inBytes+offset, length*4, outBytes+offset, pErrorCode);
                 /* swap indexes[] */
                 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_INDEXES_LENGTH]);
                 ds->swapArray32(ds, inBytes, length*4, outBytes, pErrorCode);
             }
         }
     } else {
         udata_printError(ds, "ucnv_swap(): unknown conversionType=%d!=UCNV_MBCS\n",
                          inStaticData->conversionType);
         *pErrorCode=U_UNSUPPORTED_ERROR;
         return 0;
     }
     return headerSize+(int32_t)staticDataSize+size;
 }
 #endif /* #if !UCONFIG_NO_LEGACY_CONVERSION */
 #endif

The Tor Browser / annotate

intl/icu/source/common/ucnv_bld.cpp@b8a032363ba2 (annotated)

intl/icu/source/common/ucnv_bld.cpp