/* Copyright (C) 1998 DJ Delorie, see COPYING.DJ for details */ /* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */ /* zread.h -- common declarations for djtarx with decompression support * This is free software; you can redistribute it and/or modify it under the * terms of the GNU General Public License, see the file COPYING. */ #ifndef __zread_h_ #define __zread_h_ #include #include #define memzero(s, n) memset ((void *)(s), 0, (n)) #define local static typedef unsigned char uch; typedef unsigned short ush; typedef unsigned long ulg; /* Return codes from djtarx */ #define OK 0 #define ERROR 1 #define WARNING 2 /* Compression methods */ #define STORED 0 #define COMPRESSED 1 #define PACKED 2 #define LZHED 3 /* methods 4 to 7 reserved */ #define DEFLATED 8 #define MAX_METHODS 9 extern int method; /* compression method */ extern FILE *log_out; /* the stream to output messages */ /* To save memory for 16 bit systems, some arrays are overlaid between * the various modules: * deflate: prev+head window d_buf l_buf outbuf * unlzw: tab_prefix tab_suffix stack inbuf outbuf * inflate: window inbuf * unpack: window inbuf prefix_len * unlzh: left+right window c_table inbuf c_len * For compression, input is done in window[]. For decompression, output * is done in window except for unlzw. */ #ifndef INBUFSIZ #define INBUFSIZ 0x8000 /* input buffer size */ #endif #define INBUF_EXTRA 64 /* required by unlzw() */ #ifndef OUTBUFSIZ #define OUTBUFSIZ 16384 /* output buffer size */ #endif #define OUTBUF_EXTRA 2048 /* required by unlzw() */ #ifndef DIST_BUFSIZE #define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */ #endif extern uch inbuf[]; extern uch outbuf[]; /* output buffer */ extern ush d_buf[]; /* buffer for distances, see trees.c */ extern uch window[]; /* Sliding window and suffix table (unlzw) */ #define tab_suffix window #define tab_prefix prev /* hash link (see deflate.c) */ #define head (prev+WSIZE) /* hash head (see deflate.c) */ extern ush tab_prefix[]; /* prefix code (see unlzw.c) */ extern unsigned insize; /* valid bytes in inbuf */ extern unsigned inptr; /* index of next byte to be processed in inbuf */ extern unsigned outcnt; /* bytes in output buffer */ extern long bytes_out; /* number of bytes after decompression */ extern long header_bytes; /* number of bytes in gzip header */ extern int part_nb; extern void *ifd; /* input file/diskette descriptor */ extern char *ifname; /* input file name or "-" */ extern char *progname; /* program name */ extern int pkzip; /* set for a pkzip file */ #define PACK_MAGIC "\037\036" /* Magic header for packed files */ #define GZIP_MAGIC "\037\213" /* Magic header for gzip files, 1F 8B */ #define OLD_GZIP_MAGIC "\037\236" /* Magic header for gzip 0.5 = freeze 1.x */ #define LZH_MAGIC "\037\240" /* Magic header for SCO LZH Compress files*/ #define PKZIP_MAGIC "\120\113\003\004" /* Magic header for pkzip files */ /* gzip flag byte */ #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */ #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ #define COMMENT 0x10 /* bit 4 set: file comment present */ #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ #define RESERVED 0xC0 /* bit 6,7: reserved */ /* internal file attribute */ #define UNKNOWN 0xffff #define BINARY 0 #define ASCII 1 #ifndef WSIZE # define WSIZE 0x8000 /* window size--must be a power of two, and */ #endif /* at least 32K for zip's deflate method */ #define MIN_MATCH 3 #define MAX_MATCH 258 /* The minimum and maximum match lengths */ #define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1) /* Minimum amount of lookahead, except at the end of the input file. * See deflate.c for comments about the MIN_MATCH+1. */ #define MAX_DIST (WSIZE-MIN_LOOKAHEAD) /* In order to simplify the code, particularly on 16 bit machines, match * distances are limited to MAX_DIST instead of WSIZE. */ extern int v_switch; /* be verbose (-v) */ extern int test; extern int exit_code; /* program exit code */ extern int z_switch; #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(0)) #define try_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(1)) #define put_ubyte(c,f) {window[outcnt++]=(uch)(c); if (outcnt==WSIZE)\ flush_window(f);} /* Macros for getting two-byte and four-byte header values */ #define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8)) #define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16)) /* Diagnostic functions */ #ifdef DEBUG # define Assert(cond,msg) {if(!(cond)) error(msg);} # define Trace(x) fprintf x # define Tracev(x) {if (v_switch) fprintf x ;} # define Tracevv(x) {if (v_switch) fprintf x ;} # define Tracec(c,x) {if (v_switch && (c)) fprintf x ;} # define Tracecv(c,x) {if (v_switch && (c)) fprintf x ;} #else # define Assert(cond,msg) # define Trace(x) # define Tracev(x) # define Tracevv(x) # define Tracec(c,x) # define Tracecv(c,x) #endif #define WARN(msg) {if (v_switch) fprintf msg ; \ if (exit_code == OK) exit_code = WARNING;} int (*decompressor)(void *); typedef enum { DOS_BINARY, DOS_TEXT, UNIX_TEXT } File_type; /* in djtar.c */ extern int change (char *, const char *, int); extern int isadir (char *); extern void do_directories(char *); extern File_type guess_file_type(char *, register size_t); extern char* get_new_name(char *, int *); extern void make_directory(char *); extern void rename_if_dos_device(char *); /* in untar.c */ extern int tarread (char *, long); extern void tar_gz_read (char *); /* in zmethod.c */ extern int get_method (void *); /* in unzip.c */ extern int unzip (void *); extern int check_zipfile (void); /* in unpack.c */ extern int unpack (void *); /* in unlzh.c */ extern int unlzh (void *); /* in util.c: */ extern int copy (void *); extern ulg updcrc (uch *s, unsigned n); extern void clear_bufs (void); extern int fill_inbuf (int eof_ok); extern void flush_outbuf (void); extern void flush_window (int (*)(char *, long)); extern void error (const char *m); extern void warn (char *a, char *b); extern void read_error (void); extern void *xmalloc (unsigned int size); /* in inflate.c */ extern int inflate (int (*)(char *, long)); /* in epunzip.c */ extern void epunzip_read(char *); #endif /* __zread_h_ */