160 lines
4.8 KiB
C
160 lines
4.8 KiB
C
/*
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******************************************************************************
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*
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* Copyright (C) 1999-2010, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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******************************************************************************/
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/*----------------------------------------------------------------------------------
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*
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* UDataMemory A class-like struct that serves as a handle to a piece of memory
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* that contains some ICU data (resource, converters, whatever.)
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*
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* When an application opens ICU data (with udata_open, for example,
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* a UDataMemory * is returned.
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*
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*----------------------------------------------------------------------------------*/
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#include "unicode/utypes.h"
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#include "cmemory.h"
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#include "unicode/udata.h"
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#include "udatamem.h"
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U_CFUNC void UDataMemory_init(UDataMemory *This) {
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uprv_memset(This, 0, sizeof(UDataMemory));
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This->length=-1;
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}
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U_CFUNC void UDatamemory_assign(UDataMemory *dest, UDataMemory *source) {
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/* UDataMemory Assignment. Destination UDataMemory must be initialized first. */
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UBool mallocedFlag = dest->heapAllocated;
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uprv_memcpy(dest, source, sizeof(UDataMemory));
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dest->heapAllocated = mallocedFlag;
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}
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U_CFUNC UDataMemory *UDataMemory_createNewInstance(UErrorCode *pErr) {
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UDataMemory *This;
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if (U_FAILURE(*pErr)) {
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return NULL;
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}
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This = uprv_malloc(sizeof(UDataMemory));
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if (This == NULL) {
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*pErr = U_MEMORY_ALLOCATION_ERROR; }
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else {
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UDataMemory_init(This);
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This->heapAllocated = TRUE;
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}
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return This;
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}
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U_CFUNC const DataHeader *
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UDataMemory_normalizeDataPointer(const void *p) {
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/* allow the data to be optionally prepended with an alignment-forcing double value */
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const DataHeader *pdh = (const DataHeader *)p;
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if(pdh==NULL || (pdh->dataHeader.magic1==0xda && pdh->dataHeader.magic2==0x27)) {
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return pdh;
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} else {
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#ifdef OS400
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/*
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TODO: Fix this once the compiler implements this feature. Keep in sync with genccode.c
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This is here because this platform can't currently put
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const data into the read-only pages of an object or
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shared library (service program). Only strings are allowed in read-only
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pages, so we use char * strings to store the data.
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In order to prevent the beginning of the data from ever matching the
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magic numbers we must skip the initial double.
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[grhoten 4/24/2003]
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*/
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return (const DataHeader *)*((const void **)p+1);
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#else
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return (const DataHeader *)((const double *)p+1);
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#endif
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}
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}
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U_CFUNC void UDataMemory_setData (UDataMemory *This, const void *dataAddr) {
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This->pHeader = UDataMemory_normalizeDataPointer(dataAddr);
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}
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U_CAPI void U_EXPORT2
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udata_close(UDataMemory *pData) {
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if(pData!=NULL) {
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uprv_unmapFile(pData);
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if(pData->heapAllocated ) {
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uprv_free(pData);
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} else {
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UDataMemory_init(pData);
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}
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}
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}
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U_CAPI const void * U_EXPORT2
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udata_getMemory(UDataMemory *pData) {
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if(pData!=NULL && pData->pHeader!=NULL) {
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return (char *)(pData->pHeader)+udata_getHeaderSize(pData->pHeader);
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} else {
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return NULL;
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}
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}
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/**
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* Get the length of the data item if possible.
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* The length may be up to 15 bytes larger than the actual data.
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*
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* TODO Consider making this function public.
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* It would have to return the actual length in more cases.
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* For example, the length of the last item in a .dat package could be
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* computed from the size of the whole .dat package minus the offset of the
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* last item.
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* The size of a file that was directly memory-mapped could be determined
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* using some system API.
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*
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* In order to get perfect values for all data items, we may have to add a
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* length field to UDataInfo, but that complicates data generation
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* and may be overkill.
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*
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* @param pData The data item.
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* @return the length of the data item, or -1 if not known
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* @internal Currently used only in cintltst/udatatst.c
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*/
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U_CAPI int32_t U_EXPORT2
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udata_getLength(const UDataMemory *pData) {
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if(pData!=NULL && pData->pHeader!=NULL && pData->length>=0) {
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/*
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* subtract the header size,
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* return only the size of the actual data starting at udata_getMemory()
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*/
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return pData->length-udata_getHeaderSize(pData->pHeader);
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} else {
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return -1;
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}
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}
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/**
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* Get the memory including the data header.
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* Used in cintltst/udatatst.c
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* @internal
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*/
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U_CAPI const void * U_EXPORT2
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udata_getRawMemory(const UDataMemory *pData) {
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if(pData!=NULL && pData->pHeader!=NULL) {
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return pData->pHeader;
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} else {
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return NULL;
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}
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}
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U_CFUNC UBool UDataMemory_isLoaded(const UDataMemory *This) {
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return This->pHeader != NULL;
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}
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