/* Header for tiny.c */

/* includes */
#include	<stdio.h>

/* typedefs */
typedef	unsigned char		u_char;
typedef unsigned long		u_long;
typedef unsigned int		u_int;

/* defines */
#define		OK			1
#define		NG			0

/* error return value from huffman code  */
#define	T_MEM_ERROR					-2					/* malloc failure */
#define	T_BUF_ERROR					-3					/* potential buffer overrun, compressed data too large */

/* cmd line option vals in program */
#define		OPT_Z		1
#define		OPT_H		2
#define		OPT_D		3

/* compressed data header id's */
#define	ID_ZLIB			0x7A4C6942			/* zLiB */
#define	ID_HUFF			0x48754666			/* HuFf */

/* error message indexes */
#define	INSUF_PARAM								1
#define	INVALID_PARAM							2
#define	DUP_FILENAME							3
#define	INVALID_INFILE						4
#define	INVALID_OUTFILE						5
#define	FILE_READ_ERROR						6
#define	FILE_SIZE_ZERO						7
#define	FILE_ALREADY_COMPRESSED		8
#define	MALLOC_FAIL								9
#define	BUF_OVERRUN								10
#define	FILE_WRITE_ERROR					11
#define	NOT_TINYTIM_FILE					12
#define	FILE_CORRUPT							13
#define	LENGTH_MISREPORTED				14

/* structures */

/* header for compressed file */
typedef	struct
{
	u_long	id;						/* compression type identifier */
	u_long	orig_size;			/* original data length */
	u_long	comp_size;			/* compressed data length */
}S_HDR;

/* for info used throughout tiny.c */
typedef	struct
{
	int			option;
	char		infile[100];
	char		outfile[100];
	FILE		*infile_p;
	FILE		*outfile_p;
	u_char	*wbuf_p,*rbuf_p;
	u_int		rsize;
	u_int		wsize;
	int			errval;
}S_ZIP;

/* prototypes */
void	Compress(void);
int		hufCompress(void);
int		zCompress(void);
int		GetfileSize(void);
int		Checkid(void);
int		ReadRawFile(void);
void	DeCompress(void);
int		zDeCompress(void);
int		hufDeCompress(void);
int		ReadCompressedFile(void);
int		ReadHeader(void);
void	FreeMem(void);
int		AllocMem(u_int readbufsize, u_int writebufsize);
int		Readfile(FILE *file_p, u_char *rbuffer, u_int	readsize);
int		Writefile(FILE *file_p, u_char *wbuffer, u_int	writesize);
int		OpenFiles(void);
int		GetOption(char	*optstr);
int		CheckParams(int	argc, char *argv[]);
void	Help(void);
void	ErrorReport(void);
void	ShowInfo(void);

/* huffman prototypes */
int	huffmanencoding(void);
int	huffmandecoding(void);