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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
//
// TarProcessor processes a tar byte stream (uncompressed).
//
// A tar byte stream consists of a series of file headers, each followed by
// the actual file data. Each file header starts on a block-aligned offset
// with the blocksize 512. The start of data for each file is also
// block-aligned.
//
// As a TarProcessor receives bytes, it calls the client
// callback method ReceiveFileHeader() when each complete file header has been
// received. Then the client's ReceiveFileData() will be called (possibly
// repeatedly) as the file's data is received. This is repeated until all of
// the files in the archive have been processed.
#ifndef O3D_IMPORT_CROSS_TAR_PROCESSOR_H_
#define O3D_IMPORT_CROSS_TAR_PROCESSOR_H_
#include "base/basictypes.h"
#include "core/cross/types.h"
#include "import/cross/memory_stream.h"
#include "import/cross/archive_processor.h"
namespace o3d {
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class TarProcessor : public StreamProcessor {
public:
explicit TarProcessor(ArchiveCallbackClient *callback_client)
: callback_client_(callback_client),
header_bytes_read_(0),
getting_filename_(false),
file_bytes_to_read_(0) {}
virtual ~TarProcessor() {}
// Call to "push" bytes to be processed - the appropriate callback will get
// called when we have enough data
virtual int ProcessBytes(MemoryReadStream *stream, size_t n);
private:
enum {TAR_HEADER_SIZE = 512};
enum {TAR_BLOCK_SIZE = 512};
ArchiveCallbackClient *callback_client_;
size_t header_bytes_read_;
char header_[TAR_HEADER_SIZE];
bool getting_filename_;
String file_name_;
// Initialized to total number of file bytes,
// including zero padding up to block size
// We read this many bytes to get to the next header
size_t file_bytes_to_read_;
// Initialized to the actual file size (not counting zero-padding) - keeps
// track of number of bytes the client needs to read for the current file
size_t client_file_bytes_to_read_;
DISALLOW_COPY_AND_ASSIGN(TarProcessor);
};
} // namespace o3d
#endif // O3D_IMPORT_CROSS_TAR_PROCESSOR_H_
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