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  1. /* gzguts.h -- zlib internal header definitions for gz* operations
  2.  * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 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. #ifdef HAVE_HIDDEN
  16. #  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
  17. #else
  18. #  define ZLIB_INTERNAL
  19. #endif
  20.  
  21. #include <stdio.h>
  22. #include "zlib.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. #define NO_vsnprintf
  35.  
  36.  
  37. /* unlike snprintf (which is required in C99, yet still not supported by
  38.    Microsoft more than a decade later!), _snprintf does not guarantee null
  39.    termination of the result -- however this is only used in gzlib.c where
  40.    the result is assured to fit in the space provided */
  41.  
  42. #ifndef local
  43. #  define local static
  44. #endif
  45. /* compile with -Dlocal if your debugger can't find static symbols */
  46.  
  47. /* gz* functions always use library allocation functions */
  48. #ifndef STDC
  49.   extern voidp  malloc OF((uInt size));
  50.   extern void   free   OF((voidpf ptr));
  51. #endif
  52.  
  53. /* get errno and strerror definition */
  54. #if defined UNDER_CE
  55. #  include <windows.h>
  56. #  define zstrerror() gz_strwinerror((DWORD)GetLastError())
  57. #else
  58. #  ifndef NO_STRERROR
  59. #    include <errno.h>
  60. #    define zstrerror() strerror(errno)
  61. #  else
  62. #    define zstrerror() "stdio error (consult errno)"
  63. #  endif
  64. #endif
  65.  
  66. /* provide prototypes for these when building zlib without LFS */
  67. #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
  68.     ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
  69.     ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
  70.     ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
  71.     ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
  72. #endif
  73.  
  74. /* default memLevel */
  75. #if MAX_MEM_LEVEL >= 8
  76. #  define DEF_MEM_LEVEL 8
  77. #else
  78. #  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
  79. #endif
  80.  
  81. /* default i/o buffer size -- double this for output when reading (this and
  82.    twice this must be able to fit in an unsigned type) */
  83. #define GZBUFSIZE 8192
  84.  
  85. /* gzip modes, also provide a little integrity check on the passed structure */
  86. #define GZ_NONE 0
  87. #define GZ_READ 7247
  88. #define GZ_WRITE 31153
  89. #define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
  90.  
  91. /* values for gz_state how */
  92. #define LOOK 0      /* look for a gzip header */
  93. #define COPY 1      /* copy input directly */
  94. #define GZIP 2      /* decompress a gzip stream */
  95.  
  96. /* internal gzip file state data structure */
  97. typedef struct {
  98.         /* exposed contents for gzgetc() macro */
  99.     struct gzFile_s x;      /* "x" for exposed */
  100.                             /* x.have: number of bytes available at x.next */
  101.                             /* x.next: next output data to deliver or write */
  102.                             /* x.pos: current position in uncompressed data */
  103.         /* used for both reading and writing */
  104.     int mode;               /* see gzip modes above */
  105.     int fd;                 /* file descriptor */
  106.     char *path;             /* path or fd for error messages */
  107.     unsigned size;          /* buffer size, zero if not allocated yet */
  108.     unsigned want;          /* requested buffer size, default is GZBUFSIZE */
  109.     unsigned char *in;      /* input buffer */
  110.     unsigned char *out;     /* output buffer (double-sized when reading) */
  111.     int direct;             /* 0 if processing gzip, 1 if transparent */
  112.         /* just for reading */
  113.     int how;                /* 0: get header, 1: copy, 2: decompress */
  114.     z_off64_t start;        /* where the gzip data started, for rewinding */
  115.     int eof;                /* true if end of input file reached */
  116.     int past;               /* true if read requested past end */
  117.         /* just for writing */
  118.     int level;              /* compression level */
  119.     int strategy;           /* compression strategy */
  120.         /* seek request */
  121.     z_off64_t skip;         /* amount to skip (already rewound if backwards) */
  122.     int seek;               /* true if seek request pending */
  123.         /* error information */
  124.     int err;                /* error code */
  125.     char *msg;              /* error message */
  126.         /* zlib inflate or deflate stream */
  127.     z_stream strm;          /* stream structure in-place (not a pointer) */
  128. } gz_state;
  129. typedef gz_state FAR *gz_statep;
  130.  
  131. /* shared functions */
  132. void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
  133. #if defined UNDER_CE
  134. char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
  135. #endif
  136.  
  137. /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
  138.    value -- needed when comparing unsigned to z_off64_t, which is signed
  139.    (possible z_off64_t types off_t, off64_t, and long are all signed) */
  140. #ifdef INT_MAX
  141. #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
  142. #else
  143. unsigned ZLIB_INTERNAL gz_intmax OF((void));
  144. #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
  145. #endif
  146.