[cygwin-apps/setup.git] / compress_gz.h

/*
 * Copyright (c) 2001, Robert Collins.
 *
 *     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.
 *
 *     A copy of the GNU General Public License can be found at
 *     http://www.gnu.org/
 *
 * Written by Robert Collins  <rbtcollins@hotmail.com>
 *
 */

#ifndef _COMPRESS_GZ_H_
#define _COMPRESS_GZ_H_

/* this is the parent class for all compress IO operations. 
 * It 
 */

class compress_gz:public compress
{
public:
  /* assumes decompression */
  compress_gz (io_stream *);
  /* the mode allows control, but this implementation only does compression */
  compress_gz (io_stream *, const char *);
  /* read data (duh!) */
  virtual ssize_t read (void *buffer, size_t len);
  /* provide data to (double duh!) */
  virtual ssize_t write (const void *buffer, size_t len);
  /* read data without removing it from the class's internal buffer */
  virtual ssize_t peek (void *buffer, size_t len);
  virtual long tell ();
  virtual int seek (long where, io_stream_seek_t whence);
  /* try guessing this one */
  virtual int error ();
  /* Find out the next stream name -
   * ie for foo.tar.gz, at offset 0, next_file_name = foo.tar
   * for foobar that is an compress, next_file_name is the next
   * extractable filename.
   */
  virtual const char *next_file_name ()
  {
    return NULL;
  };
  virtual int set_mtime (int);
  virtual int get_mtime ();
  /* Use seek EOF, then tell (). get_size won't do this incase you are sucking down
   * over a WAN :} */
  virtual size_t get_size () {return 0;};
  /* if you are still needing these hints... give up now! */
  virtual ~ compress_gz ();
private:
    compress_gz ()
  {
  };
  char peekbuf[512];
  size_t peeklen;
  void construct (io_stream *, const char *);
  void check_header ();
  int get_byte ();
  unsigned long getLong ();
  void putLong (unsigned long);
  void destroy ();
  int do_flush (int);
  io_stream *original;
  /* from zlib */
  z_stream stream;
  int z_err;			/* error code for last stream operation */
  int z_eof;			/* set if end of input file */
  unsigned char *inbuf;		/* input buffer */
  unsigned char *outbuf;	/* output buffer */
  uLong crc;			/* crc32 of uncompressed data */
  char *msg;			/* error message */
  int transparent;		/* 1 if input file is not a .gz file */
  char mode;			/* 'w' or 'r' */
  long startpos;		/* start of compressed data in file (header skipped) */
};

#endif /* _COMPRESS_GZ_H_ */
Commit	Line	Data
b24c88b3 RC	1	/*
	2	* Copyright (c) 2001, Robert Collins.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* A copy of the GNU General Public License can be found at
	10	* http://www.gnu.org/
	11	*
	12	* Written by Robert Collins <rbtcollins@hotmail.com>
	13	*
	14	*/
	15
	16	#ifndef _COMPRESS_GZ_H_
	17	#define _COMPRESS_GZ_H_
	18
	19	/* this is the parent class for all compress IO operations.
	20	* It
	21	*/
	22
	23	class compress_gz:public compress
	24	{
	25	public:
	26	/* assumes decompression */
	27	compress_gz (io_stream *);
	28	/* the mode allows control, but this implementation only does compression */
	29	compress_gz (io_stream , const char );
	30	/* read data (duh!) */
	31	virtual ssize_t read (void *buffer, size_t len);
	32	/* provide data to (double duh!) */
ca9506cc	33	virtual ssize_t write (const void *buffer, size_t len);
b24c88b3 RC	34	/* read data without removing it from the class's internal buffer */
	35	virtual ssize_t peek (void *buffer, size_t len);
	36	virtual long tell ();
ca9506cc	37	virtual int seek (long where, io_stream_seek_t whence);
b24c88b3 RC	38	/* try guessing this one */
	39	virtual int error ();
	40	/* Find out the next stream name -
	41	* ie for foo.tar.gz, at offset 0, next_file_name = foo.tar
	42	* for foobar that is an compress, next_file_name is the next
	43	* extractable filename.
	44	*/
	45	virtual const char *next_file_name ()
	46	{
	47	return NULL;
	48	};
	49	virtual int set_mtime (int);
	50	virtual int get_mtime ();
341988b9 RC	51	/* Use seek EOF, then tell (). get_size won't do this incase you are sucking down
	52	* over a WAN :} */
	53	virtual size_t get_size () {return 0;};
b24c88b3	54	/* if you are still needing these hints... give up now! */
341988b9	55	virtual ~ compress_gz ();
b24c88b3 RC	56	private:
	57	compress_gz ()
	58	{
	59	};
	60	char peekbuf[512];
	61	size_t peeklen;
	62	void construct (io_stream , const char );
	63	void check_header ();
	64	int get_byte ();
	65	unsigned long getLong ();
	66	void putLong (unsigned long);
	67	void destroy ();
	68	int do_flush (int);
	69	io_stream *original;
	70	/* from zlib */
	71	z_stream stream;
	72	int z_err; /* error code for last stream operation */
	73	int z_eof; /* set if end of input file */
	74	unsigned char inbuf; / input buffer */
	75	unsigned char outbuf; / output buffer */
	76	uLong crc; /* crc32 of uncompressed data */
	77	char msg; / error message */
	78	int transparent; /* 1 if input file is not a .gz file */
	79	char mode; /* 'w' or 'r' */
	80	long startpos; /* start of compressed data in file (header skipped) */
	81	};
	82
	83	#endif /* _COMPRESS_GZ_H_ */