LXR linux-old/zBoot/gzip.h

   1/* gzip.h -- common declarations for all gzip modules
   2 * Copyright (C) 1992-1993 Jean-loup Gailly.
   3 * This is free software; you can redistribute it and/or modify it under the
   4 * terms of the GNU General Public License, see the file COPYING.
   5 */
   6
   7#if defined(__STDC__) || defined(PROTO)
   8#  define OF(args)  args
   9#else
  10#  define OF(args)  ()
  11#endif
  12
  13#ifdef __STDC__
  14   typedef void *voidp;
  15#else
  16   typedef char *voidp;
  17#endif
  18
  19/* I don't like nested includes, but the string functions are used too often */
  20#if defined(HAVE_STRING_H) || defined(STDC_HEADERS)
  21#  include <string.h>
  22#  define memzero(s, n)     memset ((s), 0, (n))
  23#else
  24#  include <strings.h>
  25#  define strchr            index 
  26#  define strrchr           rindex
  27#  define memcpy(d, s, n)   bcopy((s), (d), (n)) 
  28#  define memcmp(s1, s2, n) bcmp((s1), (s2), (n)) 
  29#  define memzero(s, n)     bzero((s), (n))
  30#endif
  31
  32#if !defined(STDC_HEADERS) && defined(HAVE_MEMORY_H)
  33#  include <memory.h>
  34#endif
  35
  36#ifndef RETSIGTYPE
  37#  define RETSIGTYPE void
  38#endif
  39
  40#define local static
  41
  42typedef unsigned char  uch;
  43typedef unsigned short ush;
  44typedef unsigned long  ulg;
  45
  46/* Return codes from gzip */
  47#define OK      0
  48#define ERROR   1
  49#define WARNING 2
  50
  51/* Compression methods (see algorithm.doc) */
  52#define STORED     0
  53#define COMPRESSED 1
  54#define PACKED     2
  55/* methods 3 to 7 reserved */
  56#define DEFLATED   8
  57extern int method;         /* compression method */
  58
  59/* To save memory for 16 bit systems, some arrays are overlayed between
  60 * the various modules:
  61 * deflate:  prev+head   window      d_buf  l_buf  outbuf
  62 * unlzw:    tab_prefix  tab_suffix  stack  inbuf  outbuf
  63 * inflate:              window             inbuf
  64 * unpack:               window             inbuf
  65 * For compression, input is done in window[]. For decompression, output
  66 * is done in window except for unlzw.
  67 */
  68
  69#ifndef INBUFSIZ
  70#  define INBUFSIZ  0x8000  /* input buffer size */
  71#endif
  72#define INBUF_EXTRA  64     /* required by unlzw() */
  73
  74#ifndef OUTBUFSIZ
  75#  define OUTBUFSIZ  16384  /* output buffer size */
  76#endif
  77#define OUTBUF_EXTRA 2048   /* required by unlzw() */
  78
  79#define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */
  80
  81#ifdef DYN_ALLOC
  82#  define EXTERN(type, array)  extern type * near array
  83#  define DECLARE(type, array, size)  type * near array
  84#  define ALLOC(type, array, size) { \
  85      array = (type*)fcalloc((unsigned)(((size)+1L)/2), 2*sizeof(type)); \
  86      if (array == NULL) error("insufficient memory"); \
  87   }
  88#  define FREE(array) {if (array != NULL) fcfree(array), array=NULL;}
  89#else
  90#  define EXTERN(type, array)  extern type array[]
  91#  define DECLARE(type, array, size)  type array[size]
  92#  define ALLOC(type, array, size)
  93#  define FREE(array)
  94#endif
  95
  96EXTERN(uch, inbuf);          /* input buffer */
  97EXTERN(uch, outbuf);         /* output buffer */
  98EXTERN(ush, d_buf);          /* buffer for distances, see trees.c */
  99EXTERN(uch, window);         /* Sliding window and suffix table (unlzw) */
 100#define tab_suffix window
 101#ifndef MAXSEG_64K
 102#  define tab_prefix prev    /* hash link (see deflate.c) */
 103#  define head (prev+WSIZE)  /* hash head (see deflate.c) */
 104   EXTERN(ush, tab_prefix);  /* prefix code (see unlzw.c) */
 105#else
 106#  define tab_prefix0 prev
 107#  define head tab_prefix1
 108   EXTERN(ush, tab_prefix0); /* prefix for even codes */
 109   EXTERN(ush, tab_prefix1); /* prefix for odd  codes */
 110#endif
 111
 112extern unsigned insize; /* valid bytes in inbuf */
 113extern unsigned inptr;  /* index of next byte to be processed in inbuf */
 114extern unsigned outcnt; /* bytes in output buffer */
 115
 116extern long bytes_in;   /* number of input bytes */
 117extern long bytes_out;  /* number of output bytes */
 118extern long overhead;   /* number of bytes in gzip header */
 119
 120#define isize bytes_in
 121/* for compatibility with old zip sources (to be cleaned) */
 122
 123extern int  ifd;        /* input file descriptor */
 124extern int  ofd;        /* output file descriptor */
 125extern char ifname[];   /* input filename or "stdin" */
 126extern char ofname[];   /* output filename or "stdout" */
 127
 128extern ulg time_stamp;  /* original time stamp (modification time) */
 129extern long ifile_size; /* input file size, -1 for devices (debug only) */
 130
 131extern int exit_code;   /* program exit code */
 132
 133typedef int file_t;     /* Do not use stdio */
 134#define NO_FILE  (-1)   /* in memory compression */
 135
 136
 137#define GZIP_MAGIC     "\037\213" /* Magic header for gzip files, 1F 8B */
 138#define OLD_GZIP_MAGIC "\037\236" /* Magic header for gzip 0.5 = freeze 1.x */
 139#define PKZIP_MAGIC  "PK\003\004" /* Magic header for pkzip files */
 140#define PACK_MAGIC     "\037\036" /* Magic header for packed files */
 141
 142/* gzip flag byte */
 143#define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
 144#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
 145#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 146#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 147#define COMMENT      0x10 /* bit 4 set: file comment present */
 148#define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
 149#define RESERVED     0xC0 /* bit 6,7:   reserved */
 150
 151/* internal file attribute */
 152#define UNKNOWN (-1)
 153#define BINARY  0
 154#define ASCII   1
 155
 156#ifndef WSIZE
 157#  define WSIZE 0x8000     /* window size--must be a power of two, and */
 158#endif                     /*  at least 32K for zip's deflate method */
 159
 160#define MIN_MATCH  3
 161#define MAX_MATCH  258
 162/* The minimum and maximum match lengths */
 163
 164#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
 165/* Minimum amount of lookahead, except at the end of the input file.
 166 * See deflate.c for comments about the MIN_MATCH+1.
 167 */
 168
 169#define MAX_DIST  (WSIZE-MIN_LOOKAHEAD)
 170/* In order to simplify the code, particularly on 16 bit machines, match
 171 * distances are limited to MAX_DIST instead of WSIZE.
 172 */
 173
 174extern int decrypt;        /* flag to turn on decryption */
 175extern int save_orig_name; /* set if original name must be saved */
 176extern int verbose;        /* be verbose (-v) */
 177extern int level;          /* compression level */
 178extern int test;           /* check .z file integrity */
 179extern int to_stdout;      /* output to stdout (-c) */
 180
 181#define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
 182
 183/* put_byte is used for the compressed output, put_char for the
 184 * uncompressed output. However unlzw() uses window for its
 185 * suffix table instead of its output buffer, so it does not use put_char.
 186 * (to be cleaned up).
 187 */
 188#define put_byte(c) {outbuf[outcnt++]=(uch)(c); if (outcnt==OUTBUFSIZ)\
 189   flush_outbuf();}
 190#define put_char(c) {window[outcnt++]=(uch)(c); if (outcnt==WSIZE)\
 191   flush_window();}
 192
 193/* Output a 16 bit value, lsb first */
 194#define put_short(w) \
 195{ if (outcnt < OUTBUFSIZ-2) { \
 196    outbuf[outcnt++] = (uch) ((w) & 0xff); \
 197    outbuf[outcnt++] = (uch) ((ush)(w) >> 8); \
 198  } else { \
 199    put_byte((uch)((w) & 0xff)); \
 200    put_byte((uch)((ush)(w) >> 8)); \
 201  } \
 202}
 203
 204/* Output a 32 bit value to the bit stream, lsb first */
 205#define put_long(n) { \
 206    put_short((n) & 0xffff); \
 207    put_short(((ulg)(n)) >> 16); \
 208}
 209
 210#define seekable()    0  /* force sequential output */
 211#define translate_eol 0  /* no option -a yet */
 212
 213#define tolow(c)  (isupper(c) ? (c)-'A'+'a' : (c))    /* force to lower case */
 214
 215/* Macros for getting two-byte and four-byte header values */
 216#define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))
 217#define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))
 218
 219/* Diagnostic functions */
 220#ifdef DEBUG
 221#  define Assert(cond,msg) {if(!(cond)) error(msg);}
 222#  define Trace(x) fprintf x
 223#  define Tracev(x) {if (verbose) fprintf x ;}
 224#  define Tracevv(x) {if (verbose>1) fprintf x ;}
 225#  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
 226#  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
 227#else
 228#  define Assert(cond,msg)
 229#  define Trace(x)
 230#  define Tracev(x)
 231#  define Tracevv(x)
 232#  define Tracec(c,x)
 233#  define Tracecv(c,x)
 234#endif
 235
 236        /* in zip.c: */
 237extern void zip    OF((int in, int out));
 238extern int file_read  OF((char *buf,  unsigned size));
 239
 240        /* in unzip.c */
 241extern void unzip        OF((int in, int out));
 242extern int check_zipfile OF((int in));
 243
 244        /* in unpack.c */
 245extern void unpack        OF((int in, int out));
 246
 247        /* in gzip.c */
 248RETSIGTYPE abort_gzip   OF((void));
 249
 250        /* in deflate.c */
 251void lm_init OF((int pack_level, ush *flags));
 252ulg  deflate OF((void));
 253
 254        /* in trees.c */
 255void ct_init     OF((ush *attr, int *method));
 256int  ct_tally    OF((int dist, int lc));
 257ulg  flush_block OF((char *buf, ulg stored_len, int eof));
 258
 259        /* in bits.c */
 260void     bi_init    OF((file_t zipfile));
 261void     send_bits  OF((int value, int length));
 262unsigned bi_reverse OF((unsigned value, int length));
 263void     bi_windup  OF((void));
 264void     copy_block OF((char *buf, unsigned len, int header));
 265extern   int (*read_buf) OF((char *buf, unsigned size));
 266
 267        /* in util.c: */
 268extern ulg  updcrc        OF((uch *s, unsigned n));
 269extern void clear_bufs    OF((void));
 270extern int  fill_inbuf    OF((void));
 271extern void flush_outbuf  OF((void));
 272extern void flush_window  OF((void));
 273extern char *strlwr       OF((char *s));
 274extern char *basename     OF((char *fname));
 275extern char *add_envopt   OF((int *argcp, char ***argvp, char *env));
 276extern void error         OF((char *m));
 277extern void warn          OF((char *a, char *b));
 278extern void read_error    OF((void));
 279extern void write_error   OF((void));
 280extern void display_ratio OF((long num, long den));
 281extern voidp xmalloc      OF((unsigned int size));
 282
 283        /* in inflate.c */
 284extern int inflate OF((void));
 285