/* -*-C++-*-    $NetBSD: file.h,v 1.6 2008/04/28 20:23:20 martin Exp $  */

/*-
 * Copyright (c) 1996, 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Matthias Drochner. and UCHIYAMA Yasushi.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#ifndef _HPCBOOT_FILE_H_
#define _HPCBOOT_FILE_H_

#include <hpcboot.h>

class Console;
struct z_stream_s;

class File {
protected:
        Console *&_cons;
        BOOL _debug;
        BOOL _to_ascii(char *, const TCHAR *, size_t);
        char _ascii_filename[MAX_PATH];

public:
        File(Console *&cons) : _cons(cons) { /* NO-OP */ }
        virtual ~File() { /* NO-OP */ }
        BOOL &setDebug(void) { return _debug; }

        virtual BOOL setRoot(TCHAR *) = 0;
        virtual BOOL open(const TCHAR *, uint32_t = OPEN_EXISTING) = 0;
        virtual size_t size(void) = 0;
        virtual size_t realsize(void) { return size(); };
        virtual BOOL close(void) = 0;
        virtual size_t read(void *, size_t, off_t = -1) = 0;
        virtual size_t write(const void *, size_t, off_t = -1) = 0;
        virtual BOOL seek(off_t) = 0;
};

class FileManager : public File {
        // GZIP staff
#define Z_BUFSIZE       1024
private:
        enum flags {
                ASCII_FLAG  = 0x01, /* bit 0 set: file probably ascii text */
                HEAD_CRC    = 0x02, /* bit 1 set: header CRC present */
                EXTRA_FIELD = 0x04, /* bit 2 set: extra field present */
                ORIG_NAME   = 0x08, /* bit 3 set: original file name present */
                COMMENT     = 0x10, /* bit 4 set: file comment present */
                RESERVED    = 0xE0  /* bits 5..7: reserved */
        };

        struct z_stream_s *_stream;
        int _gz_magic[2];
        int _z_err;             /* error code for last stream operation */
        int _z_eof;             /* set if end of input file */
        uint8_t _inbuf[Z_BUFSIZE];      /* input buffer */
        uint32_t _crc;          /* crc32 of uncompressed data */
        BOOL _compressed;

        void _reset(void);
        int _get_byte(void);
        uint32_t _get_long(void);
        void _check_header(void);
        size_t _skip_compressed(off_t);

        off_t _cur_ofs;

private:
        File *_file;

public:
        FileManager(Console *&, enum FileOps);
        virtual ~FileManager(void);

        BOOL setRoot(TCHAR *);
        BOOL open(const TCHAR *, uint32_t);
        size_t size(void);
        size_t realsize(void);
        BOOL close(void);
        size_t read(void *, size_t, off_t = -1);
        size_t write(const void *, size_t, off_t = -1);
        BOOL seek(off_t);
        size_t _read(void *, size_t);
};

#endif //_HPCBOOT_FILE_H_