229 lines
9.0 KiB
C++
229 lines
9.0 KiB
C++
// Filename: virtualFileMountMultifile.cxx
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// Created by: drose (03Aug02)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) Carnegie Mellon University. All rights reserved.
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//
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// All use of this software is subject to the terms of the revised BSD
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// license. You should have received a copy of this license along
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// with this source code in a file named "LICENSE."
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//
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////////////////////////////////////////////////////////////////////
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#include "virtualFileMountMultifile.h"
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#include "virtualFileSystem.h"
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TypeHandle VirtualFileMountMultifile::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: VirtualFileMountMultifile::Destructor
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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VirtualFileMountMultifile::
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~VirtualFileMountMultifile() {
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}
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////////////////////////////////////////////////////////////////////
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// Function: VirtualFileMountMultifile::has_file
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// Access: Public, Virtual
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// Description: Returns true if the indicated file exists within the
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// mount system.
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////////////////////////////////////////////////////////////////////
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bool VirtualFileMountMultifile::
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has_file(const Filename &file) const {
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return (file.empty() ||
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_multifile->find_subfile(file) >= 0 ||
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_multifile->has_directory(file));
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}
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////////////////////////////////////////////////////////////////////
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// Function: VirtualFileMountMultifile::is_directory
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// Access: Public, Virtual
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// Description: Returns true if the indicated file exists within the
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// mount system and is a directory.
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////////////////////////////////////////////////////////////////////
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bool VirtualFileMountMultifile::
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is_directory(const Filename &file) const {
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return (file.empty() || _multifile->has_directory(file));
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}
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////////////////////////////////////////////////////////////////////
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// Function: VirtualFileMountMultifile::is_regular_file
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// Access: Public, Virtual
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// Description: Returns true if the indicated file exists within the
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// mount system and is a regular file.
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////////////////////////////////////////////////////////////////////
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bool VirtualFileMountMultifile::
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is_regular_file(const Filename &file) const {
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return (_multifile->find_subfile(file) >= 0);
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}
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////////////////////////////////////////////////////////////////////
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// Function: VirtualFileMountMultifile::read_file
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// Access: Public, Virtual
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// Description: Fills up the indicated pvector with the contents of
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// the file, if it is a regular file. Returns true on
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// success, false otherwise.
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////////////////////////////////////////////////////////////////////
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bool VirtualFileMountMultifile::
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read_file(const Filename &file, bool do_uncompress,
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pvector<unsigned char> &result) const {
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if (do_uncompress) {
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// If the file is to be decompressed, we'd better just use the
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// higher-level implementation, which includes support for
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// on-the-fly decompression.
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return VirtualFileMount::read_file(file, do_uncompress, result);
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}
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// But if we're just reading a straight file, let the Multifile do
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// the reading, which avoids a few levels of buffer copies.
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int subfile_index = _multifile->find_subfile(file);
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if (subfile_index < 0) {
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express_cat.info()
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<< "Unable to read " << file << "\n";
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return false;
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}
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return _multifile->read_subfile(subfile_index, result);
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}
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////////////////////////////////////////////////////////////////////
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// Function: VirtualFileMountMultifile::open_read_file
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// Access: Public, Virtual
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// Description: Opens the file for reading, if it exists. Returns a
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// newly allocated istream on success (which you should
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// eventually delete when you are done reading).
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// Returns NULL on failure.
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////////////////////////////////////////////////////////////////////
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istream *VirtualFileMountMultifile::
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open_read_file(const Filename &file) const {
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int subfile_index = _multifile->find_subfile(file);
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if (subfile_index < 0) {
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return NULL;
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}
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// The caller will eventually pass this pointer to
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// VirtualFileSystem::close_read_file(), not to
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// Multifile::close_read_subfile(). Fortunately, these two methods
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// do the same thing, so that doesn't matter.
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return _multifile->open_read_subfile(subfile_index);
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}
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////////////////////////////////////////////////////////////////////
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// Function: VirtualFileMountMultifile::get_file_size
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// Access: Published, Virtual
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// Description: Returns the current size on disk (or wherever it is)
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// of the already-open file. Pass in the stream that
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// was returned by open_read_file(); some
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// implementations may require this stream to determine
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// the size.
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////////////////////////////////////////////////////////////////////
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off_t VirtualFileMountMultifile::
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get_file_size(const Filename &file, istream *) const {
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int subfile_index = _multifile->find_subfile(file);
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if (subfile_index < 0) {
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return 0;
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}
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return _multifile->get_subfile_length(subfile_index);
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}
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////////////////////////////////////////////////////////////////////
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// Function: VirtualFileMountMultifile::get_file_size
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// Access: Published, Virtual
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// Description: Returns the current size on disk (or wherever it is)
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// of the file before it has been opened.
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////////////////////////////////////////////////////////////////////
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off_t VirtualFileMountMultifile::
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get_file_size(const Filename &file) const {
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int subfile_index = _multifile->find_subfile(file);
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if (subfile_index < 0) {
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return 0;
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}
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return _multifile->get_subfile_length(subfile_index);
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}
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////////////////////////////////////////////////////////////////////
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// Function: VirtualFileMountMultifile::get_timestamp
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// Access: Published, Virtual
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// Description: Returns a time_t value that represents the time the
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// file was last modified, to within whatever precision
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// the operating system records this information (on a
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// Windows95 system, for instance, this may only be
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// accurate to within 2 seconds).
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//
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// If the timestamp cannot be determined, either because
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// it is not supported by the operating system or
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// because there is some error (such as file not found),
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// returns 0.
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////////////////////////////////////////////////////////////////////
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time_t VirtualFileMountMultifile::
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get_timestamp(const Filename &file) const {
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int subfile_index = _multifile->find_subfile(file);
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if (subfile_index < 0) {
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return 0;
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}
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return _multifile->get_subfile_timestamp(subfile_index);
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}
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////////////////////////////////////////////////////////////////////
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// Function: VirtualFileMountMultifile::get_system_info
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// Access: Public, Virtual
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// Description: Populates the SubfileInfo structure with the data
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// representing where the file actually resides on disk,
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// if this is knowable. Returns true if the file might
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// reside on disk, and the info is populated, or false
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// if it might not (or it is not known where the file
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// resides), in which case the info is meaningless.
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////////////////////////////////////////////////////////////////////
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bool VirtualFileMountMultifile::
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get_system_info(const Filename &file, SubfileInfo &info) {
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Filename multifile_name = _multifile->get_multifile_name();
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if (multifile_name.empty()) {
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return false;
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}
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int subfile_index = _multifile->find_subfile(file);
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if (subfile_index < 0) {
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return false;
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}
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if (_multifile->is_subfile_compressed(subfile_index) ||
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_multifile->is_subfile_encrypted(subfile_index)) {
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return false;
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}
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streampos start = _multifile->get_subfile_internal_start(subfile_index);
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size_t length = _multifile->get_subfile_internal_length(subfile_index);
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info = SubfileInfo(multifile_name, start, length);
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return true;
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}
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////////////////////////////////////////////////////////////////////
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// Function: VirtualFileMountMultifile::scan_directory
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// Access: Public, Virtual
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// Description: Fills the given vector up with the list of filenames
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// that are local to this directory, if the filename is
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// a directory. Returns true if successful, or false if
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// the file is not a directory or cannot be read.
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////////////////////////////////////////////////////////////////////
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bool VirtualFileMountMultifile::
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scan_directory(vector_string &contents, const Filename &dir) const {
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return _multifile->scan_directory(contents, dir);
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}
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////////////////////////////////////////////////////////////////////
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// Function: VirtualFileMountMultifile::output
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void VirtualFileMountMultifile::
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output(ostream &out) const {
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out << _multifile->get_multifile_name();
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}
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