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Annotation of embedaddon/sudo/zlib/gzguts.h, revision 1.1.1.1

1.1       misho       1: /* gzguts.h -- zlib internal header definitions for gz* operations
                      2:  * Copyright (C) 2004, 2005, 2010 Mark Adler
                      3:  * For conditions of distribution and use, see copyright notice in zlib.h
                      4:  */
                      5: 
                      6: #ifdef _LARGEFILE64_SOURCE
                      7: #  ifndef _LARGEFILE_SOURCE
                      8: #    define _LARGEFILE_SOURCE 1
                      9: #  endif
                     10: #  ifdef _FILE_OFFSET_BITS
                     11: #    undef _FILE_OFFSET_BITS
                     12: #  endif
                     13: #endif
                     14: 
                     15: #if ((__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33) && !defined(NO_VIZ)
                     16: #  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
                     17: #else
                     18: #  define ZLIB_INTERNAL
                     19: #endif
                     20: 
                     21: #include "zlib.h"
                     22: #include <stdio.h>
                     23: #ifdef STDC
                     24: #  include <string.h>
                     25: #  include <stdlib.h>
                     26: #  include <limits.h>
                     27: #endif
                     28: #include <fcntl.h>
                     29: 
                     30: #ifdef NO_DEFLATE       /* for compatibility with old definition */
                     31: #  define NO_GZCOMPRESS
                     32: #endif
                     33: 
                     34: #ifdef _MSC_VER
                     35: #  include <io.h>
                     36: #  define vsnprintf _vsnprintf
                     37: #endif
                     38: 
                     39: #ifndef local
                     40: #  define local static
                     41: #endif
                     42: /* compile with -Dlocal if your debugger can't find static symbols */
                     43: 
                     44: /* gz* functions always use library allocation functions */
                     45: #ifndef STDC
                     46:   extern voidp  malloc OF((uInt size));
                     47:   extern void   free   OF((voidpf ptr));
                     48: #endif
                     49: 
                     50: /* get errno and strerror definition */
                     51: #if defined UNDER_CE
                     52: #  include <windows.h>
                     53: #  define zstrerror() gz_strwinerror((DWORD)GetLastError())
                     54: #else
                     55: #  ifdef STDC
                     56: #    include <errno.h>
                     57: #    define zstrerror() strerror(errno)
                     58: #  else
                     59: #    define zstrerror() "stdio error (consult errno)"
                     60: #  endif
                     61: #endif
                     62: 
                     63: /* provide prototypes for these when building zlib without LFS */
                     64: #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
                     65:     ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
                     66:     ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
                     67:     ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
                     68:     ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
                     69: #endif
                     70: 
                     71: /* default i/o buffer size -- double this for output when reading */
                     72: #define GZBUFSIZE 8192
                     73: 
                     74: /* gzip modes, also provide a little integrity check on the passed structure */
                     75: #define GZ_NONE 0
                     76: #define GZ_READ 7247
                     77: #define GZ_WRITE 31153
                     78: #define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
                     79: 
                     80: /* values for gz_state how */
                     81: #define LOOK 0      /* look for a gzip header */
                     82: #define COPY 1      /* copy input directly */
                     83: #define GZIP 2      /* decompress a gzip stream */
                     84: 
                     85: /* internal gzip file state data structure */
                     86: typedef struct {
                     87:         /* used for both reading and writing */
                     88:     int mode;               /* see gzip modes above */
                     89:     int fd;                 /* file descriptor */
                     90:     char *path;             /* path or fd for error messages */
                     91:     z_off64_t pos;          /* current position in uncompressed data */
                     92:     unsigned size;          /* buffer size, zero if not allocated yet */
                     93:     unsigned want;          /* requested buffer size, default is GZBUFSIZE */
                     94:     unsigned char *in;      /* input buffer */
                     95:     unsigned char *out;     /* output buffer (double-sized when reading) */
                     96:     unsigned char *next;    /* next output data to deliver or write */
                     97:         /* just for reading */
                     98:     unsigned have;          /* amount of output data unused at next */
                     99:     int eof;                /* true if end of input file reached */
                    100:     z_off64_t start;        /* where the gzip data started, for rewinding */
                    101:     z_off64_t raw;          /* where the raw data started, for seeking */
                    102:     int how;                /* 0: get header, 1: copy, 2: decompress */
                    103:     int direct;             /* true if last read direct, false if gzip */
                    104:         /* just for writing */
                    105:     int level;              /* compression level */
                    106:     int strategy;           /* compression strategy */
                    107:         /* seek request */
                    108:     z_off64_t skip;         /* amount to skip (already rewound if backwards) */
                    109:     int seek;               /* true if seek request pending */
                    110:         /* error information */
                    111:     int err;                /* error code */
                    112:     char *msg;              /* error message */
                    113:         /* zlib inflate or deflate stream */
                    114:     z_stream strm;          /* stream structure in-place (not a pointer) */
                    115: } gz_state;
                    116: typedef gz_state FAR *gz_statep;
                    117: 
                    118: /* shared functions */
                    119: void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
                    120: #if defined UNDER_CE
                    121: char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
                    122: #endif
                    123: 
                    124: /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
                    125:    value -- needed when comparing unsigned to z_off64_t, which is signed
                    126:    (possible z_off64_t types off_t, off64_t, and long are all signed) */
                    127: #ifdef INT_MAX
                    128: #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
                    129: #else
                    130: unsigned ZLIB_INTERNAL gz_intmax OF((void));
                    131: #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
                    132: #endif