Logo Search packages:      
Sourcecode: scummvm version File versions  Download package

zipreader.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program 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 General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */


#include "common/scummsys.h"
#include "zipreader.h"

ZipFile::ZipFile() {
      // Locate a zip file in cartridge memory space

//    consolePrintf("ZIP file check...");

      char *p = (char *) ZF_SEARCH_START;
      bool found = false;

      _zipFile = NULL;

      while ((p != (char *) ZF_SEARCH_END) && (!found)) {
            // Zip file header is: 0x504B0304

            if ( (*p == 0x50) && (*(p + 1) == 0x4B) && (*(p + 2) == 0x03) && (*(p + 3) == 0x04) ) {
                  // Found header!
                  found = true;
                  _zipFile = p;
            }

            if (!found) p += ZF_SEARCH_STRIDE;

      }

      if (_zipFile) {
            consolePrintf("ZIP File found Ok!\n");
      } else {
//          consolePrintf("Not in use!\n");
            return;
      }

      changeToRoot();
      restartFile();

      if (_currentFile->compSize != (u32) getFileSize()) {
            consolePrintf("Error: ZIP file contains compression!\n");
      }

      _allFilesVisible = false;
}

bool ZipFile::isReady() {
      return _zipFile != NULL;
}

bool ZipFile::restartFile() {
      _currentFile = (FileHeader *) _zipFile;
      char name[128];
      getFileName(name);

      bool more = true;

      while (!currentFileInFolder() && more) {
            getFileName(name);
            more = skipFile();
      }

      return more;
}

bool ZipFile::currentFileInFolder() {
      char name[128];

      if (_allFilesVisible)
            return true;

      getFileName(name);

//    consolePrintf("N:'%s'D:'%s'\n", name, _directory);

      if (_directory[0] == 0) { // Root directory
            name[strlen(name) - 1] = 0;
            return !strchr(name, '\\');   // Not in root if contains a / character before the last character
      } else {
/*          if (name starts with directory && it's not the directory
                  && (no slashes after the directory || it's the last character)
                  && (slash follows directory)
      */
            if ((strstr(name, _directory) == name) && (strlen(name) != strlen(_directory))
                  && ((strchr(name + strlen(_directory) + 1, '\\') == NULL)
                  || (strchr(name + strlen(_directory) + 1, '\\') == name + strlen(name) - 1))
                  && (*(name + strlen(_directory)) == '\\')) {
                  return true;
            }
      }

      return false;
}

void ZipFile::getFileName(char *name) {
      strncpy(name, (char *) (_currentFile + 1), _currentFile->nameLength);

      for (int r = 0; name[r] != 0; r++) {
            if (name[r] == '/') name[r] = '\\';
      }

      name[_currentFile->nameLength] = 0;

      if (name[strlen(name) - 1] == '\\') {
            name[strlen(name) - 1] = 0;
      }
}

bool ZipFile::skipFile() {
      bool valid;

      do {

            // Move on to the next file
            _currentFile = (FileHeader *) (
                  getFile() + _currentFile->fileSize
            );

                  // Return true if there are more files.  Check this by looking for the magic number
            valid = (_currentFile->magic[0] == 0x50) &&
                        (_currentFile->magic[1] == 0x4B) &&
                        (_currentFile->magic[2] == 0x03) &&
                        (_currentFile->magic[3] == 0x04);


      } while (valid && !currentFileInFolder());

      return valid;

      // Currently doesn't handle data descriptors!
}



int ZipFile::getFileSize() {
      return _currentFile->fileSize;
}

bool ZipFile::isDirectory() {
      return _currentFile->fileSize == 0;             // This is a bit wrong, but seems to work.
}

char *ZipFile::getFile() {
      return ((char *) (_currentFile)) + sizeof(*_currentFile) + _currentFile->nameLength + _currentFile->extraLength;
}

bool ZipFile::findFile(const char *search) {
      changeToRoot();
      restartFile();

      char searchName[128];
      strcpy(searchName, search);
      char *tmp = searchName;

      // Change slashes to backslashes
      for (; *tmp; ++tmp) {
            if (*tmp == '/')
                  *tmp = '\\';
      }

      // Remove trailing slashes
      if (*(tmp-1) == '\\') {
            *(tmp-1) = 0;
      }


      do {
            char name[128];
            getFileName(name);
            if (*(name + strlen(name) - 1) == '\\') { // Directories have a terminating slash
                  *(name + strlen(name) - 1) = '\0';        // which we need to dispose of.
            }


            if (!stricmp(name, searchName)) {
//                consolePrintf("'%s'=='%s'\n", name, searchName);
                  return true;            // Got it!
            } else {
//                consolePrintf("'%s'!='%s'\n", name, searchName);
            }
      } while (skipFile());

      return false;           // File wasn't found
}

void ZipFile::changeToRoot() {
      _directory[0] = 0;
}

void ZipFile::changeDirectory(const char *dir) {
//    consolePrintf("Current dir now '%s'\n", dir);

      assert(dir && *dir);

      // Copy dir to _directory, changing slashes to backslashes
      char *dst = _directory;
      for (; *dir; ++dir) {
            if (*dir == '/')
                  *dst++ = '\\';
            else
                  *dst++ = *dir;
      }

      // Remove trailing backslash
      if (*(dst-1) == '\\') {
            *(dst-1) = 0;
      }
}

Generated by  Doxygen 1.6.0   Back to index