136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 1998-1999, 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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* File ufile.c
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*
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* Modification History:
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*
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* Date Name Description
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* 11/19/98 stephen Creation.
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* 03/12/99 stephen Modified for new C API.
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* 12/01/99 weiv ufille_fill_uchar_buffer modified to be able to use invariant conversion
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*******************************************************************************
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*/
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#include <stdio.h>
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#include "ustdio.h"
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#include "ufile.h"
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#include "cmemory.h"
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#include "cstring.h"
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#define MIN(a,b) (a < b ? a : b)
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#define MAX(a,b) (a > b ? a : b)
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UFILE*
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u_finit(FileStream *f, const char *cp,
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UErrorCode *status)
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{
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UFILE *result = (UFILE*) uprv_malloc(sizeof(UFILE));
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if(result == 0) {
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*status = U_MEMORY_ALLOCATION_ERROR;
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return 0;
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}
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result->fFile = f;
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result->fOwnFile = FALSE;
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result->fUCPos = result->fUCBuffer;
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result->fUCLimit = result->fUCBuffer;
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if(cp == 0) { /* weiv: we're using the default converter*/
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result->fConverter = ucnv_open(0, status);
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if(U_FAILURE(*status) || result->fConverter == 0) {
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T_FileStream_close(result->fFile);
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uprv_free(result);
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return 0;
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}
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} else if (uprv_strlen(cp)>uprv_strlen("")) { /*weiv: we're specifying the converter*/
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result->fConverter = ucnv_open(cp, status);
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if(U_FAILURE(*status) || result->fConverter == 0) {
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T_FileStream_close(result->fFile);
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uprv_free(result);
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return 0;
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}
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} else { /*weiv: we'll go for invariant converter */
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result->fConverter = NULL;
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}
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return result;
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}
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void
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u_fclose(UFILE *file)
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{
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if(file->fOwnFile)
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T_FileStream_close(file->fFile);
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ucnv_close(file->fConverter);
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uprv_free(file);
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}
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/* private function used for buffering input */
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void
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ufile_fill_uchar_buffer(UFILE *f,
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UErrorCode *status)
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{
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const char *mySource;
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const char *mySourceEnd;
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UChar *myTarget;
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int32_t bufferSize;
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int32_t maxCPBytes;
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int32_t bytesRead;
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int32_t availLength;
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int32_t dataSize;
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if(U_FAILURE(*status)) return;
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/* shift the buffer if it isn't empty */
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dataSize = f->fUCLimit - f->fUCPos;
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if(dataSize != 0) {
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uprv_memmove(f->fUCBuffer,
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f->fUCPos,
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dataSize * sizeof(UChar));
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}
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/* record how much buffer space is available */
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availLength = UFILE_UCHARBUFFER_SIZE - dataSize;
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/* Determine the # of codepage bytes needed to fill our UChar buffer */
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maxCPBytes = availLength * (f->fConverter!=NULL?ucnv_getMaxCharSize(f->fConverter):1); /*weiv: Probably shoud #define it somewhere */
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/* Read in the data to convert */
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bytesRead = T_FileStream_read(f->fFile,f->fCharBuffer,
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MIN(maxCPBytes, UFILE_CHARBUFFER_SIZE));
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/* Set up conversion parameters */
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*status = U_ZERO_ERROR;
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mySource = f->fCharBuffer;
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mySourceEnd = f->fCharBuffer + bytesRead;
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myTarget = f->fUCBuffer + dataSize;
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bufferSize = UFILE_UCHARBUFFER_SIZE;
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if(f->fConverter != NULL) { /*weiv: we have a good converter, so we'll just use it */
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/* Perform the conversion */
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ucnv_toUnicode(f->fConverter,
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&myTarget,
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f->fUCBuffer + bufferSize,
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&mySource,
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mySourceEnd,
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NULL,
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TRUE,
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status);
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} else { /*weiv: we couldn't obtain a converter, so we'll go with invariant conversion */
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u_charsToUChars(mySource, myTarget, bytesRead);
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myTarget += bytesRead;
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}
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/* update the pointers into our array */
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f->fUCPos = f->fUCBuffer;
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f->fUCLimit = myTarget;
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}
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