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112 lines
2.3 KiB
C++
112 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "DiskFileReader.h"
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#include "ErrorHandling.h"
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DiskFileReader::DiskFileReader(Pool &p, const char *fileName,
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Int32 _bufferSize) : FileReader(p)
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{
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fp = 0;
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buffer = 0;
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#ifdef NO_NSPR
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if (!(fp = fopen(fileName, "rb"))) {
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#else
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if (!(fp = PR_Open(fileName, PR_RDONLY, 0))) {
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#endif
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verifyError(VerifyError::noClassDefFound);
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return;
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}
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bufferSize = _bufferSize;
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eofReached = false;
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buffer = new (pool) char[bufferSize];
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if (!fillBuf())
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verifyError(VerifyError::noClassDefFound);
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}
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/* Fill the buffer, returning number of items read */
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Int32 DiskFileReader::fillBuf()
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{
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if (eofReached)
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return 0;
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#ifdef NO_NSPR
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Int32 nread = fread(buffer, 1, bufferSize, fp);
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#else
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Int32 nread = PR_Read(fp, buffer, bufferSize);
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#endif
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if (nread < bufferSize) {
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eofReached = true;
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if (fp)
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#ifdef NO_NSPR
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fclose(fp);
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#else
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PR_Close(fp);
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#endif
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fp = 0;
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}
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curp = buffer;
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limit = buffer+nread;
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return nread;
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}
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bool DiskFileReader::read1(char *destp, int size)
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{
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while (curp+size > limit) {
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int nread = (limit-curp);
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memcpy(destp, curp, nread);
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size -= nread;
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destp += nread;
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if (fillBuf() <= 0)
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return false;
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}
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memcpy(destp, curp, size);
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curp += size;
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return true;
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}
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DiskFileReader::~DiskFileReader()
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{
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if (fp)
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#ifdef NO_NSPR
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fclose(fp);
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#else
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PR_Close(fp);
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#endif
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}
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