/*----------------------------------------------------------------------*
* *
* checkCommonData Validate the format of a common data file. *
* Fill in the virtual function ptr based on TOC type *
* If the data is invalid, close the UDataMemory *
* and set the appropriate error code. *
* *
*----------------------------------------------------------------------*/
U_CFUNC void udata_checkCommonData(UDataMemory *udm, UErrorCode *err) {
if (U_FAILURE(*err)) {
return;
}
if(udm==NULL || udm->pHeader==NULL) {
*err=U_INVALID_FORMAT_ERROR;
} else if(!(udm->pHeader->dataHeader.magic1==0xda &&
udm->pHeader->dataHeader.magic2==0x27 &&
udm->pHeader->info.isBigEndian==U_IS_BIG_ENDIAN &&
udm->pHeader->info.charsetFamily==U_CHARSET_FAMILY)
) {
/* header not valid */
*err=U_INVALID_FORMAT_ERROR;
}
else if (udm->pHeader->info.dataFormat[0]==0x43 &&
udm->pHeader->info.dataFormat[1]==0x6d &&
udm->pHeader->info.dataFormat[2]==0x6e &&
udm->pHeader->info.dataFormat[3]==0x44 &&
udm->pHeader->info.formatVersion[0]==1
) {
/* dataFormat="CmnD" */
udm->vFuncs = &CmnDFuncs;
udm->toc=(const char *)udm->pHeader+udata_getHeaderSize(udm->pHeader);
}
else if(udm->pHeader->info.dataFormat[0]==0x54 &&
udm->pHeader->info.dataFormat[1]==0x6f &&
udm->pHeader->info.dataFormat[2]==0x43 &&
udm->pHeader->info.dataFormat[3]==0x50 &&
udm->pHeader->info.formatVersion[0]==1
) {
/* dataFormat="ToCP" */
udm->vFuncs = &ToCPFuncs;
udm->toc=(const char *)udm->pHeader+udata_getHeaderSize(udm->pHeader);
}
else {
/* dataFormat not recognized */
*err=U_INVALID_FORMAT_ERROR;
}
if (U_FAILURE(*err)) {
/* If the data is no good and we memory-mapped it ourselves,
* close the memory mapping so it doesn't leak. Note that this has
* no effect on non-memory mapped data, other than clearing fields in udm.
*/
udata_close(udm);
}
}
U_CAPI const void * U_EXPORT2
udata_getMemory(UDataMemory *pData) {
if(pData!=NULL && pData->pHeader!=NULL) {
return (char *)(pData->pHeader)+udata_getHeaderSize(pData->pHeader);
} else {
return NULL;
}
}
/**
* Get the length of the data item if possible.
* The length may be up to 15 bytes larger than the actual data.
*
* TODO Consider making this function public.
* It would have to return the actual length in more cases.
* For example, the length of the last item in a .dat package could be
* computed from the size of the whole .dat package minus the offset of the
* last item.
* The size of a file that was directly memory-mapped could be determined
* using some system API.
*
* In order to get perfect values for all data items, we may have to add a
* length field to UDataInfo, but that complicates data generation
* and may be overkill.
*
* @param pData The data item.
* @return the length of the data item, or -1 if not known
* @internal Currently used only in cintltst/udatatst.c
*/
U_CAPI int32_t U_EXPORT2
udata_getLength(const UDataMemory *pData) {
if(pData!=NULL && pData->pHeader!=NULL && pData->length>=0) {
/*
* subtract the header size,
* return only the size of the actual data starting at udata_getMemory()
*/
return pData->length-udata_getHeaderSize(pData->pHeader);
} else {
return -1;
}
}
