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scuffed-code/icu4c/source/common/udata.c

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/*
******************************************************************************
*
* Copyright (C) 1999-2001, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************
* file name: udata.c
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 1999oct25
* created by: Markus W. Scherer
*/
#include "unicode/utypes.h"
#include "unicode/putil.h"
#include "umutex.h"
#include "cmemory.h"
#include "cstring.h"
#include "unicode/udata.h"
#include "unicode/uversion.h"
#include "uhash.h"
#include "ucln_cmn.h"
#include "udatamem.h"
#include "umapfile.h"
#include "ucmndata.h"
/***********************************************************************
*
* Notes on the organization of the ICU data implementation
*
* All of the public API is defined in udata.h
*
* The implementation is split into several files...
*
* - udata.c (this file) contains higher level code that knows about
* the search paths for locating data, caching opened data, etc.
*
* - umapfile.c contains the low level platform-specific code for actually loading
* (memory mapping, file reading, whatever) data into memory.
*
* - ucmndata.c deals with the tables of contents of ICU data items within
* an ICU common format data file. The implementation includes
* an abstract interface and support for multiple TOC formats.
* All knowledge of any specific TOC format is encapsulated here.
*
* - udatamem.c has code for managing UDataMemory structs. These are little
* descriptor objects for blocks of memory holding ICU data of
* various types.
*/
/* configuration ---------------------------------------------------------- */
/* If you are excruciatingly bored turn this on .. */
/* #define UDATA_DEBUG 1 */
#if defined(UDATA_DEBUG)
# include <stdio.h>
#endif
/***********************************************************************
*
* static (Global) data
*
************************************************************************/
static UDataMemory *gCommonICUData = NULL; /* Pointer to the common ICU data. */
/* May be updated once, if we started with */
/* a stub or subset library. */
static UDataMemory *gStubICUData = NULL; /* If gCommonICUData does get updated, remember */
/* the original one so that it can be cleaned */
/* up when ICU is shut down. */
static UHashtable *gCommonDataCache = NULL; /* Global hash table of opened ICU data files. */
UBool
udata_cleanup()
{
if (gCommonDataCache) { /* Delete the cache of user data mappings. */
uhash_close(gCommonDataCache); /* Table owns the contents, and will delete them. */
gCommonDataCache = NULL; /* Cleanup is not thread safe. */
}
if (gCommonICUData != NULL) {
udata_close(gCommonICUData); /* Clean up common ICU Data */
gCommonICUData = NULL;
}
if (gStubICUData != NULL) {
udata_close(gStubICUData); /* Clean up the stub ICU Data */
gStubICUData = NULL;
}
return TRUE; /* Everything was cleaned up */
}
/*
* setCommonICUData. Set a UDataMemory to be the global ICU Data
*/
static void
setCommonICUData(UDataMemory *pData, /* The new common data. Belongs to caller, we copy it. */
UDataMemory *oldData, /* Old ICUData ptr. Overwrite of this value is ok, */
/* of any others is not. */
UBool warn, /* If true, set USING_DEFAULT warning if ICUData was */
/* changed by another thread before we got to it. */
UErrorCode *pErr)
{
UDataMemory *newCommonData = UDataMemory_createNewInstance(pErr);
if (U_FAILURE(*pErr)) {
return;
}
/* For the assignment, other threads must cleanly see either the old */
/* or the new, not some partially initialized new. The old can not be */
/* deleted - someone may still have a pointer to it lying around in */
/* their locals. */
UDatamemory_assign(newCommonData, pData);
umtx_lock(NULL);
if (gCommonICUData==oldData) {
gStubICUData = gCommonICUData; /* remember the old Common Data, so it can be cleaned up. */
gCommonICUData = newCommonData;
}
else {
if (warn==TRUE) {
*pErr = U_USING_DEFAULT_WARNING;
}
uprv_free(newCommonData);
}
umtx_unlock(NULL);
return;
}
static char *
strcpy_returnEnd(char *dest, const char *src) {
while((*dest=*src)!=0) {
++dest;
++src;
}
return dest;
}
/*------------------------------------------------------------------------------
*
* computeDirPath given a user-supplied path of an item to be opened,
* compute and return
* - the full directory path to be used
* when opening the file.
* - Pointer to null at end of above returned path
*
* Parameters:
* path: input path. Buffer is not altered.
* pathBuffer: Output buffer. Any contents are overwritten.
*
* Returns:
* Pointer to null termination in returned pathBuffer.
*
* TODO: This works the way ICU historically has, but the
* whole data fallback search path is so complicated that
* proabably almost no one will ever really understand it,
* the potential for confusion is large. (It's not just
* this one function, but the whole scheme.)
*
*------------------------------------------------------------------------------*/
char *
uprv_computeDirPath(const char *path, char *pathBuffer) {
char *finalSlash; /* Ptr to last dir separator in input path, or null if none. */
int pathLen; /* Length of the returned directory path */
finalSlash = 0;
if (path != 0) {
finalSlash = uprv_strrchr(path, U_FILE_SEP_CHAR);
}
*pathBuffer = 0;
if (finalSlash == 0) {
/* No user-supplied path.
* Copy the ICU_DATA path to the path buffer and return that*/
const char *icuDataDir;
icuDataDir=u_getDataDirectory();
if(icuDataDir!=NULL && *icuDataDir!=0) {
return strcpy_returnEnd(pathBuffer, icuDataDir);
} else {
/* there is no icuDataDir either. Just return the empty pathBuffer. */
return pathBuffer;
}
}
/* User supplied path did contain a directory portion.
* Copy it to the output path buffer */
pathLen = finalSlash - path + 1;
uprv_memcpy(pathBuffer, path, pathLen);
*(pathBuffer+pathLen) = 0;
return pathBuffer+pathLen;
}
static const char *
findBasename(const char *path) {
const char *basename=uprv_strrchr(path, U_FILE_SEP_CHAR);
if(basename==NULL) {
return path;
} else {
return basename+1;
}
}
/*----------------------------------------------------------------------*
* *
* Cache for common data *
* Functions for looking up or adding entries to a cache of *
* data that has been previously opened. Avoids a potentially *
* expensive operation of re-opening the data for subsequent *
* uses. *
* *
* Data remains cached for the duration of the process. *
* *
*----------------------------------------------------------------------*/
typedef struct DataCacheElement {
char *name;
UDataMemory *item;
} DataCacheElement;
/*
* Deleter function for DataCacheElements.
* udata cleanup function closes the hash table; hash table in turn calls back to
* here for each entry.
*/
static void U_EXPORT2 U_CALLCONV DataCacheElement_deleter(void *pDCEl) {
DataCacheElement *p = (DataCacheElement *)pDCEl;
udata_close(p->item); /* unmaps storage */
uprv_free(p->name); /* delete the hash key string. */
uprv_free(pDCEl); /* delete 'this' */
}
/* udata_getCacheHashTable()
* Get the hash table used to store the data cache entries.
* Lazy create it if it doesn't yet exist.
*/
static UHashtable *udata_getHashTable() {
UErrorCode err = U_ZERO_ERROR;
if (gCommonDataCache != NULL) {
return gCommonDataCache;
}
umtx_lock(NULL);
if (gCommonDataCache == NULL) {
gCommonDataCache = uhash_open(uhash_hashChars, uhash_compareChars, &err);
uhash_setValueDeleter(gCommonDataCache, DataCacheElement_deleter);
}
umtx_unlock(NULL);
if (U_FAILURE(err)) {
return NULL; /* TODO: handle this error better. */
}
return gCommonDataCache;
}
static UDataMemory *udata_findCachedData(const char *path)
{
UHashtable *htable;
UDataMemory *retVal = NULL;
DataCacheElement *el;
const char *baseName;
baseName = findBasename(path); /* Cache remembers only the base name, not the full path. */
htable = udata_getHashTable();
umtx_lock(NULL);
el = (DataCacheElement *)uhash_get(htable, baseName);
umtx_unlock(NULL);
if (el != NULL) {
retVal = el->item;
}
return retVal;
}
static UDataMemory *udata_cacheDataItem(const char *path, UDataMemory *item, UErrorCode *pErr) {
DataCacheElement *newElement;
const char *baseName;
int nameLen;
UHashtable *htable;
UDataMemory *oldValue = NULL;
if (U_FAILURE(*pErr)) {
return NULL;
}
/* Create a new DataCacheElement - the thingy we store in the hash table -
* and copy the supplied path and UDataMemoryItems into it.
*/
newElement = uprv_malloc(sizeof(DataCacheElement));
if (newElement == NULL) {
*pErr = U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
newElement->item = UDataMemory_createNewInstance(pErr);
if (U_FAILURE(*pErr)) {
return NULL;
}
UDatamemory_assign(newElement->item, item);
baseName = findBasename(path);
nameLen = uprv_strlen(baseName);
newElement->name = uprv_malloc(nameLen+1);
if (newElement->name == NULL) {
*pErr = U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
uprv_strcpy(newElement->name, baseName);
/* Stick the new DataCacheElement into the hash table.
*/
htable = udata_getHashTable();
umtx_lock(NULL);
oldValue = uhash_get(htable, path);
if (oldValue != NULL) {
*pErr = U_USING_DEFAULT_WARNING; }
else {
uhash_put(
htable,
newElement->name, /* Key */
newElement, /* Value */
pErr);
}
umtx_unlock(NULL);
if (*pErr == U_USING_DEFAULT_WARNING || U_FAILURE(*pErr)) {
uprv_free(newElement->name);
uprv_free(newElement->item);
uprv_free(newElement);
return oldValue;
}
return newElement->item;
}
/*----------------------------------------------------------------------*
* *
* Add a static reference to the common data library *
* Unless overridden by an explicit u_setCommonData, this will be *
* our common data. *
* *
*----------------------------------------------------------------------*/
extern const DataHeader U_IMPORT U_ICUDATA_ENTRY_POINT;
/*----------------------------------------------------------------------*
* *
* openCommonData Attempt to open a common format (.dat) file *
* Map it into memory (if it's not there already) *
* and return a UDataMemory object for it. *
* *
* If the requested data is already open and cached *
* just return the cached UDataMem object. *
* *
*----------------------------------------------------------------------*/
static UDataMemory *
openCommonData(
const char *path, /* Path from OpenCHoice? */
UBool isICUData, /* ICU Data true if path == NULL */
UErrorCode *pErrorCode)
{
const char *inBasename;
char *basename, *suffix;
char pathBuffer[1024];
UDataMemory tData;
if (U_FAILURE(*pErrorCode)) {
return NULL;
}
UDataMemory_init(&tData);
if (isICUData) {
/* "mini-cache" for common ICU data */
if(gCommonICUData != NULL) {
return gCommonICUData;
}
tData.pHeader = &U_ICUDATA_ENTRY_POINT;
udata_checkCommonData(&tData, pErrorCode);
setCommonICUData(&tData, NULL, FALSE, pErrorCode);
return gCommonICUData;
}
/* request is NOT for ICU Data. */
/* Find the base name portion of the supplied path. */
/* inBasename will be left pointing somewhere within the original path string. */
inBasename=findBasename(path);
if(*inBasename==0) {
/* no basename. This will happen if the original path was a directory name, */
/* like "a/b/c/". (Fallback to separate files will still work.) */
*pErrorCode=U_FILE_ACCESS_ERROR;
return NULL;
}
/* Is the requested common data file already open and cached? */
/* Note that the cache is keyed by the base name only. The rest of the path, */
/* if any, is not considered. */
{
UDataMemory *dataToReturn = udata_findCachedData(inBasename);
if (dataToReturn != NULL) {
return dataToReturn;
}
}
/* Requested item is not in the cache.
* Hunt it down, trying all the fall back locations.
*/
/* try path/basename first, then basename only */
basename=uprv_computeDirPath(path, pathBuffer); /* pathBuffer = directory path */
suffix=strcpy_returnEnd(basename, inBasename); /* append the base name. */
uprv_strcpy(suffix, ".dat"); /* append ".dat" */
uprv_mapFile(&tData, pathBuffer);
if (!UDataMemory_isLoaded(&tData)) {
/* The data didn't open. Try again without the directory portion of the name */
if (basename!=pathBuffer) {
uprv_mapFile(&tData, basename);
}
}
if (!UDataMemory_isLoaded(&tData)) {
/* no common data */
*pErrorCode=U_FILE_ACCESS_ERROR;
return NULL;
}
/* we have mapped a file, check its header */
udata_checkCommonData(&tData, pErrorCode);
/* Cache the UDataMemory struct for this .dat file,
* so we won't need to hunt it down and map it again next time
* something is needed from it. */
return udata_cacheDataItem(inBasename, &tData, pErrorCode);
}
#ifdef OS390
# define MAX_STUB_ENTRIES 7
#else
# define MAX_STUB_ENTRIES 0
#endif
/*----------------------------------------------------------------------*
* *
* extendICUData If the full set of ICU data was not loaded at *
* program startup, load it now. This function will *
* be called when the lookup of an ICU data item in *
* the common ICU data fails. *
* *
* The parameter is the UDataMemory in which the *
* search for a requested item failed. *
* *
* return true if new data is loaded, false otherwise.*
* *
*----------------------------------------------------------------------*/
static UBool extendICUData(UDataMemory *failedData, UErrorCode *pErr)
{
/* If the data library that we are running with turns out to be the
* stub library (or, on the 390, the subset library), we will try to
* load a .dat file instead. The stub library has no entries in its
* TOC, which is how we identify it here.
*/
UDataMemory *pData;
UDataMemory copyPData;
if (failedData->vFuncs->NumEntries(failedData) > MAX_STUB_ENTRIES) {
/* Not the stub. We can't extend. */
return FALSE;
}
/* See if we can explicitly open a .dat file for the ICUData. */
pData = openCommonData(
U_ICUDATA_NAME, /* "icudt20l" , for example. */
FALSE, /* Pretend we're not opening ICUData */
pErr);
/* How about if there is no pData, eh... */
UDataMemory_init(&copyPData);
if(pData != NULL) {
UDatamemory_assign(&copyPData, pData);
copyPData.map = 0; /* The mapping for this data is owned by the hash table */
copyPData.mapAddr = 0; /* which will unmap it when ICU is shut down. */
/* CommonICUData is also unmapped when ICU is shut down.*/
/* To avoid unmapping the data twice, zero out the map */
/* fields in the UDataMemory that we're assigning */
/* to CommonICUData. */
setCommonICUData(&copyPData, /* The new common data. */
failedData, /* Old ICUData ptr. Overwrite of this value is ok, */
FALSE, /* No warnings if write didn't happen */
pErr); /* setCommonICUData honors errors; NOP if error set */
}
return gCommonICUData != failedData; /* Return true if ICUData pointer was updated. */
/* (Could potentialy have been done by another thread racing */
/* us through here, but that's fine, we still return true */
/* so that current thread will also examine extended data. */
}
/*----------------------------------------------------------------------*
* *
* udata_setCommonData *
* *
*----------------------------------------------------------------------*/
U_CAPI void U_EXPORT2
udata_setCommonData(const void *data, UErrorCode *pErrorCode) {
UDataMemory dataMemory;
if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
return;
}
if(data==NULL) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return;
}
/* do we already have common ICU data set? */
if(gCommonICUData != NULL) {
*pErrorCode=U_USING_DEFAULT_ERROR;
return;
}
/* set the data pointer and test for validity */
UDataMemory_init(&dataMemory);
UDataMemory_setData(&dataMemory, data);
udata_checkCommonData(&dataMemory, pErrorCode);
if (U_FAILURE(*pErrorCode)) {return;}
/* we have good data */
/* Set it up as the ICU Common Data. */
setCommonICUData(&dataMemory, NULL, TRUE, pErrorCode);
}
/*---------------------------------------------------------------------------
*
* udata_setAppData
*
*---------------------------------------------------------------------------- */
U_CAPI void U_EXPORT2
udata_setAppData(const char *path, const void *data, UErrorCode *err)
{
UDataMemory udm;
if(err==NULL || U_FAILURE(*err)) {
return;
}
if(data==NULL) {
*err=U_ILLEGAL_ARGUMENT_ERROR;
return;
}
UDataMemory_init(&udm);
udm.pHeader = data;
udata_checkCommonData(&udm, err);
udata_cacheDataItem(path, &udm, err);
}
/*----------------------------------------------------------------------------*
* *
* checkDataItem Given a freshly located/loaded data item, either *
* an entry in a common file or a separately loaded file, *
* sanity check its header, and see if the data is *
* acceptable to the app. *
* If the data is good, create and return a UDataMemory *
* object that can be returned to the application. *
* Return NULL on any sort of failure. *
* *
*----------------------------------------------------------------------------*/
static UDataMemory *
checkDataItem
(
const DataHeader *pHeader, /* The data item to be checked. */
UDataMemoryIsAcceptable *isAcceptable, /* App's call-back function */
void *context, /* pass-thru param for above. */
const char *type, /* pass-thru param for above. */
const char *name, /* pass-thru param for above. */
UErrorCode *nonFatalErr, /* Error code if this data was not acceptable */
/* but openChoice should continue with */
/* trying to get data from fallback path. */
UErrorCode *fatalErr /* Bad error, caller should return immediately */
)
{
UDataMemory *rDataMem = NULL; /* the new UDataMemory, to be returned. */
if (U_FAILURE(*fatalErr)) {
return NULL;
}
if(pHeader->dataHeader.magic1==0xda &&
pHeader->dataHeader.magic2==0x27 &&
pHeader->info.isBigEndian==U_IS_BIG_ENDIAN &&
(isAcceptable==NULL || isAcceptable(context, type, name, &pHeader->info))
) {
rDataMem=UDataMemory_createNewInstance(fatalErr);
if (U_FAILURE(*fatalErr)) {
return NULL;
}
rDataMem->pHeader = pHeader;
} else {
/* the data is not acceptable, look further */
/* If we eventually find something good, this errorcode will be */
/* cleared out. */
*nonFatalErr=U_INVALID_FORMAT_ERROR;
}
return rDataMem;
}
/*
* A note on the ownership of Mapped Memory
*
* For common format files, ownership resides with the UDataMemory object
* that lives in the cache of opened common data. These UDataMemorys are private
* to the udata implementation, and are never seen directly by users.
*
* The UDataMemory objects returned to users will have the address of some desired
* data within the mapped region, but they wont have the mapping info itself, and thus
* won't cause anything to be removed from memory when they are closed.
*
* For individual data files, the UDataMemory returned to the user holds the
* information necessary to unmap the data on close. If the user independently
* opens the same data file twice, two completely independent mappings will be made.
* (There is no cache of opened data items from individual files, only a cache of
* opened Common Data files, that is, files containing a collection of data items.)
*
* For common data passed in from the user via udata_setAppData() or
* udata_setCommonData(), ownership remains with the user.
*
* UDataMemory objects themselves, as opposed to the memory they describe,
* can be anywhere - heap, stack/local or global.
* They have a flag to indicate when they're heap allocated and thus
* must be deleted when closed.
*/
/*----------------------------------------------------------------------------*
* *
* main data loading functions *
* *
*----------------------------------------------------------------------------*/
static UDataMemory *
doOpenChoice(const char *path, const char *type, const char *name,
UDataMemoryIsAcceptable *isAcceptable, void *context,
UErrorCode *pErrorCode)
{
char pathBuffer[1024];
char tocEntryName[100];
UDataMemory dataMemory;
UDataMemory *pCommonData;
UDataMemory *pEntryData;
const DataHeader *pHeader;
const char *inBasename;
char *basename;
char *suffix;
UErrorCode errorCode=U_ZERO_ERROR;
UBool isICUData= (UBool)(path==NULL);
/* Make up a full mame by appending the type to the supplied
* name, assuming that a type was supplied.
*/
uprv_strcpy(tocEntryName, name);
if(type!=NULL && *type!=0) {
uprv_strcat(tocEntryName, ".");
uprv_strcat(tocEntryName, type);
}
/* try to get common data. The loop is for platforms such as the 390 that do
* not initially load the full set of ICU data. If the lookup of an ICU data item
* fails, the full (but slower to load) set is loaded, the and the loop repeats,
* trying the lookup again. Once the full set of ICU data is loaded, the loop wont
* repeat because the full set will be checked the first time through.
*
* The loop also handles the fallback to a .dat file if the application linked
* to the stub data library rather than a real library.
*/
for (;;) {
pCommonData=openCommonData(path, isICUData, &errorCode);
if(U_SUCCESS(errorCode)) {
/* look up the data piece in the common data */
pHeader=pCommonData->vFuncs->Lookup(pCommonData, tocEntryName, &errorCode);
if(pHeader!=NULL) {
pEntryData = checkDataItem(pHeader, isAcceptable, context, type, name, &errorCode, pErrorCode);
if (U_FAILURE(*pErrorCode)) {
return NULL;
}
if (pEntryData != NULL) {
return pEntryData;
}
}
}
/* Data wasn't found. If we were looking for an ICUData item and there is
* more data available, load it and try again,
* otherwise break out of this loop. */
if (!(isICUData && extendICUData(pCommonData, &errorCode))) {
break;
}
};
/* the data was not found in the common data, look further, */
/* try to get an individual data file */
basename=uprv_computeDirPath(path, pathBuffer);
if(isICUData) {
inBasename=COMMON_DATA_NAME;
} else {
inBasename=findBasename(path);
}
#ifdef UDATA_DEBUG
fprintf(stderr, "looking for ind. file\n");
#endif
/* try path+basename+"_"+entryName first */
if(*inBasename!=0) {
suffix=strcpy_returnEnd(basename, inBasename);
*suffix++='_';
uprv_strcpy(suffix, tocEntryName);
if( uprv_mapFile(&dataMemory, pathBuffer) ||
(basename!=pathBuffer && uprv_mapFile(&dataMemory, basename)))
{
/* We mapped a file. Check out its contents. */
pEntryData = checkDataItem(dataMemory.pHeader, isAcceptable, context, type, name, &errorCode, pErrorCode);
if (pEntryData != NULL)
{
/* Got good data.
* Hand off ownership of the backing memory to the user's UDataMemory.
* and return it. */
pEntryData->mapAddr = dataMemory.mapAddr;
pEntryData->map = dataMemory.map;
return pEntryData;
}
/* the data is not acceptable, or some error occured. Either way, unmap the memory */
udata_close(&dataMemory);
/* If we had a nasty error, bail out completely. */
if (U_FAILURE(*pErrorCode)) {
return NULL;
}
/* Otherwise remember that we found data but didn't like it for some reason,
* and continue looking
*/
errorCode=U_INVALID_FORMAT_ERROR;
}
}
/* try path+entryName next */
uprv_strcpy(basename, tocEntryName);
if( uprv_mapFile(&dataMemory, pathBuffer) ||
(basename!=pathBuffer && uprv_mapFile(&dataMemory, basename)))
{
pEntryData = checkDataItem(dataMemory.pHeader, isAcceptable, context, type, name, &errorCode, pErrorCode);
if (pEntryData != NULL) {
/* Data is good.
* Hand off ownership of the backing memory to the user's UDataMemory.
* and return it. */
pEntryData->mapAddr = dataMemory.mapAddr;
pEntryData->map = dataMemory.map;
return pEntryData;
}
/* the data is not acceptable, or some error occured. Either way, unmap the memory */
udata_close(&dataMemory);
/* If we had a nasty error, bail out completely. */
if (U_FAILURE(*pErrorCode)) {
return NULL;
}
/* Otherwise remember that we found data but didn't like it for some reason */
errorCode=U_INVALID_FORMAT_ERROR;
}
/* data not found */
if(U_SUCCESS(*pErrorCode)) {
if(U_SUCCESS(errorCode)) {
/* file not found */
*pErrorCode=U_FILE_ACCESS_ERROR;
} else {
/* entry point not found or rejected */
*pErrorCode=errorCode;
}
}
return NULL;
}
/* API ---------------------------------------------------------------------- */
U_CAPI UDataMemory * U_EXPORT2
udata_open(const char *path, const char *type, const char *name,
UErrorCode *pErrorCode) {
#ifdef UDATA_DEBUG
fprintf(stderr, "udata_open(): Opening: %s . %s\n", name, type);
fflush(stderr);
#endif
if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
return NULL;
} else if(name==NULL || *name==0) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return NULL;
} else {
return doOpenChoice(path, type, name, NULL, NULL, pErrorCode);
}
}
U_CAPI UDataMemory * U_EXPORT2
udata_openChoice(const char *path, const char *type, const char *name,
UDataMemoryIsAcceptable *isAcceptable, void *context,
UErrorCode *pErrorCode) {
#ifdef UDATA_DEBUG
fprintf(stderr, "udata_openChoice(): Opening: %s . %s\n", name, type);fflush(stderr);
#endif
if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
return NULL;
} else if(name==NULL || *name==0 || isAcceptable==NULL) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return NULL;
} else {
return doOpenChoice(path, type, name, isAcceptable, context, pErrorCode);
}
}
U_CAPI void U_EXPORT2
udata_getInfo(UDataMemory *pData, UDataInfo *pInfo) {
if(pInfo!=NULL) {
if(pData!=NULL && pData->pHeader!=NULL) {
const UDataInfo *info=&pData->pHeader->info;
if(pInfo->size>info->size) {
pInfo->size=info->size;
}
uprv_memcpy((uint16_t *)pInfo+1, (uint16_t *)info+1, pInfo->size-2);
} else {
pInfo->size=0;
}
}
}
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