161 lines
3.1 KiB
C++
161 lines
3.1 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 "FileReader.h"
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FileReader::FileReader(Pool &p, const char *fileName, int *status,
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int _bufferSize) : pool(p)
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{
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fp = 0;
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buffer = 0;
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*status = 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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*status = 1;
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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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*status = 1;
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}
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/* Fill the buffer, returning number of items read */
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int FileReader::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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int nread = fread(buffer, 1, bufferSize, fp);
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#else
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int 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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int FileReader::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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int FileReader::readU1(char *destp, int numItems)
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{
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return read1(destp, numItems);
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}
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#ifdef IS_LITTLE_ENDIAN
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#define flipU2(x) (((x) & 0xFF00) >> 8) | (((x) & 0x00FF) << 8)
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#else
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#define flipU2(x) (x)
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#endif
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int FileReader::readU2(uint16 *destp, int numItems)
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{
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if (!read1((char *) destp, numItems*2))
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return false;
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#ifdef IS_LITTLE_ENDIAN
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for (numItems--; numItems >= 0; numItems--)
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destp[numItems] = flipU2(destp[numItems]);
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#endif
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return true;
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}
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#ifdef IS_LITTLE_ENDIAN
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#define flipU4(x) (((x) >> 24) |\
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((((x) << 8) >> 24) << 8) |\
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((((x) << 16) >> 24) << 16) |\
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((x) << 24))
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#else
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#define flipU4(x) (x)
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#endif
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int FileReader::readU4(uint32 *destp, int numItems)
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{
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if (!read1((char *) destp, numItems*4))
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return false;
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#ifdef IS_LITTLE_ENDIAN
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for (numItems--; numItems >= 0; numItems--)
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destp[numItems] = flipU4(destp[numItems]);
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#endif
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return true;
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}
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FileReader::~FileReader()
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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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