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      1 /* -*-C++-*-	$NetBSD: file.h,v 1.6 2008/04/28 20:23:20 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996, 2001 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matthias Drochner. and UCHIYAMA Yasushi.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _HPCBOOT_FILE_H_
     33 #define	_HPCBOOT_FILE_H_
     34 
     35 #include <hpcboot.h>
     36 
     37 class Console;
     38 struct z_stream_s;
     39 
     40 class File {
     41 protected:
     42 	Console *&_cons;
     43 	BOOL _debug;
     44 	BOOL _to_ascii(char *, const TCHAR *, size_t);
     45 	char _ascii_filename[MAX_PATH];
     46 
     47 public:
     48 	File(Console *&cons) : _cons(cons) { /* NO-OP */ }
     49 	virtual ~File() { /* NO-OP */ }
     50 	BOOL &setDebug(void) { return _debug; }
     51 
     52 	virtual BOOL setRoot(TCHAR *) = 0;
     53 	virtual BOOL open(const TCHAR *, uint32_t = OPEN_EXISTING) = 0;
     54 	virtual size_t size(void) = 0;
     55 	virtual size_t realsize(void) { return size(); };
     56 	virtual BOOL close(void) = 0;
     57 	virtual size_t read(void *, size_t, off_t = -1) = 0;
     58 	virtual size_t write(const void *, size_t, off_t = -1) = 0;
     59 	virtual BOOL seek(off_t) = 0;
     60 };
     61 
     62 class FileManager : public File {
     63 	// GZIP staff
     64 #define	Z_BUFSIZE	1024
     65 private:
     66 	enum flags {
     67 		ASCII_FLAG  = 0x01, /* bit 0 set: file probably ascii text */
     68 		HEAD_CRC    = 0x02, /* bit 1 set: header CRC present */
     69 		EXTRA_FIELD = 0x04, /* bit 2 set: extra field present */
     70 		ORIG_NAME   = 0x08, /* bit 3 set: original file name present */
     71 		COMMENT	    = 0x10, /* bit 4 set: file comment present */
     72 		RESERVED    = 0xE0  /* bits 5..7: reserved */
     73 	};
     74 
     75 	struct z_stream_s *_stream;
     76 	int _gz_magic[2];
     77 	int _z_err;		/* error code for last stream operation */
     78 	int _z_eof;		/* set if end of input file */
     79 	uint8_t _inbuf[Z_BUFSIZE];	/* input buffer */
     80 	uint32_t _crc;		/* crc32 of uncompressed data */
     81 	BOOL _compressed;
     82 
     83 	void _reset(void);
     84 	int _get_byte(void);
     85 	uint32_t _get_long(void);
     86 	void _check_header(void);
     87 	size_t _skip_compressed(off_t);
     88 
     89 	off_t _cur_ofs;
     90 
     91 private:
     92 	File *_file;
     93 
     94 public:
     95 	FileManager(Console *&, enum FileOps);
     96 	virtual ~FileManager(void);
     97 
     98 	BOOL setRoot(TCHAR *);
     99 	BOOL open(const TCHAR *, uint32_t);
    100 	size_t size(void);
    101 	size_t realsize(void);
    102 	BOOL close(void);
    103 	size_t read(void *, size_t, off_t = -1);
    104 	size_t write(const void *, size_t, off_t = -1);
    105 	BOOL seek(off_t);
    106 	size_t _read(void *, size_t);
    107 };
    108 
    109 #endif //_HPCBOOT_FILE_H_
    110