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  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 <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. #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
  133.