SDLPAL/adplug/binfile.cpp

/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * binfile.h - Binary file I/O
 * Copyright (C) 2002, 2003 Simon Peter <dn.tlp@gmx.net>
 */

#include <stdio.h>
#include <errno.h>

#include "binfile.h"

/***** binfbase *****/

binfbase::binfbase()
      : f(NULL) {
}

binfbase::~binfbase() {
   if (f != NULL) close();
}

void binfbase::close() {
   if (f != NULL) {
      if (fclose(f) == EOF) err |= Fatal;
      else f = NULL;
   } else
      err |= NotOpen;
}

void binfbase::seek(long pos, Offset offs) {
   int error = -1;

   if (f == NULL) {
      err |= NotOpen;
      return;
   }

   switch (offs) {
   case Set:
      error = fseek(f, pos, SEEK_SET);
      break;
   case Add:
      error = fseek(f, pos, SEEK_CUR);
      break;
   case End:
      error = fseek(f, pos, SEEK_END);
      break;
   }

   if (error == -1)
      err |= Fatal;
}

long binfbase::pos() {
   long pos;

   if (f == NULL) {
      err |= NotOpen;
      return 0;
   }

   pos = ftell(f);

   if (pos == -1) {
      err |= Fatal;
      return 0;
   } else
      return pos;
}

/***** binifstream *****/

binifstream::binifstream() {
}

binifstream::binifstream(const char *filename, const Mode mode) {
   open(filename, mode);
}

#if BINIO_ENABLE_STRING
binifstream::binifstream(const std::string &filename, const Mode mode) {
   open(filename, mode);
}
#endif

binifstream::~binifstream() {
}

void binifstream::open(const char *filename, const Mode mode) {
   f = fopen(filename, "rb");

   if (f == NULL)
      switch (errno) {
      case ENOENT:
         err |= NotFound;
         break;
      case EACCES:
         err |= Denied;
         break;
      default:
         err |= NotOpen;
         break;
      }
}

#if BINIO_ENABLE_STRING
void binifstream::open(const std::string &filename, const Mode mode) {
   open(filename.c_str(), mode);
}
#endif

binifstream::Byte binifstream::getByte() {
   int read;

   if (f != NULL) {
      read = fgetc(f);
      if (read == EOF) err |= Eof;
      return (Byte)read;
   } else {
      err |= NotOpen;
      return 0;
   }
}

/***** binofstream *****/

binofstream::binofstream() {
}

binofstream::binofstream(const char *filename, const Mode mode) {
   open(filename, mode);
}

#if BINIO_ENABLE_STRING
binofstream::binofstream(const std::string &filename, const Mode mode) {
   open(filename, mode);
}
#endif

binofstream::~binofstream() {
}

void binofstream::open(const char *filename, const Mode mode) {
   char modestr[] = "wb";

   // Check if append mode is desired
   if (mode & Append) modestr[0] = 'a';

   f = fopen(filename, modestr);

   if (f == NULL)
      switch (errno) {
      case EEXIST:
      case EACCES:
      case EROFS:
         err |= Denied;
         break;
      case ENOENT:
         err |= NotFound;
         break;
      default:
         err |= NotOpen;
         break;
      }
}

#if BINIO_ENABLE_STRING
void binofstream::open(const std::string &filename, const Mode mode) {
   open(filename.c_str(), mode);
}
#endif

void binofstream::putByte(Byte b) {
   if (f == NULL) {
      err |= NotOpen;
      return;
   }

   if (fputc(b, f) == EOF)
      err |= Fatal;
}

/***** binfstream *****/

binfstream::binfstream() {
}

binfstream::binfstream(const char *filename, const Mode mode) {
   open(filename, mode);
}

#if BINIO_ENABLE_STRING
binfstream::binfstream(const std::string &filename, const Mode mode) {
   open(filename, mode);
}
#endif

binfstream::~binfstream() {
}

void binfstream::open(const char *filename, const Mode mode) {
   char modestr[] = "w+b";	// Create & at beginning
   int	ferror = 0;

   // Apply desired mode
   if (mode & NoCreate) {
      if (!(mode & Append))
         modestr[0] = 'r';	// NoCreate & at beginning
   } else
      if (mode & Append)	// Create & append
         modestr[0] = 'a';

   f = fopen(filename, modestr);

   // NoCreate & append (emulated -- not possible with standard C fopen())
   if (f != NULL && (mode & Append) && (mode & NoCreate))
      ferror = fseek(f, 0, SEEK_END);

   if (f == NULL || ferror == -1) {
      switch (errno) {
      case EEXIST:
      case EACCES:
      case EROFS:
         err |= Denied;
         break;
      case ENOENT:
         err |= NotFound;
         break;
      default:
         err |= NotOpen;
         break;
      }
   }
}

#if BINIO_ENABLE_STRING
void binfstream::open(const std::string &filename, const Mode mode) {
   open(filename.c_str(), mode);
}
#endif