int strategy));
This is another version of deflateInit with more compression options. The
- fields next_in, zalloc, zfree and opaque must be initialized before by the
- caller.
+ fields zalloc, zfree and opaque must be initialized before by the caller.
The method parameter is the compression method. It must be Z_DEFLATED in
this version of the library.
detection, or add 16 to decode only the gzip format (the zlib format will
return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is a
CRC-32 instead of an Adler-32. Unlike the gunzip utility and gzread() (see
- below), inflate() will not automatically decode concatenated gzip streams.
- inflate() will return Z_STREAM_END at the end of the gzip stream. The state
- would need to be reset to continue decoding a subsequent gzip stream.
+ below), inflate() will *not* automatically decode concatenated gzip members.
+ inflate() will return Z_STREAM_END at the end of the gzip member. The state
+ would need to be reset to continue decoding a subsequent gzip member. This
+ *must* be done if there is more data after a gzip member, in order for the
+ decompression to be compliant with the gzip standard (RFC 1952).
inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
len2.
*/
+/*
+ZEXTERN void ZEXPORT crc32_combine_gen OF((z_crc_t op[32], z_off_t len2));
+
+ Generate the operator op corresponding to length len2, to be used with
+ crc32_combine_op(). op must have room for 32 z_crc_t values. (32 is the
+ number of bits in the CRC.)
+*/
+
+ZEXTERN uLong ZEXPORT crc32_combine_op OF((uLong crc1, uLong crc2,
+ const z_crc_t *op));
+/*
+ Give the same result as crc32_combine(), using op in place of len2. op is
+ is generated from len2 by crc32_combine_gen(). This will be faster than
+ crc32_combine() if the generated op is used many times.
+*/
+
/* various hacks, don't look :) */
ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t));
ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t));
+ ZEXTERN void ZEXPORT crc32_combine_gen64 OF((z_crc_t *op, z_off64_t));
#endif
#if !defined(ZLIB_INTERNAL) && defined(Z_WANT64)
# define z_gzoffset z_gzoffset64
# define z_adler32_combine z_adler32_combine64
# define z_crc32_combine z_crc32_combine64
+# define z_crc32_combine_gen z_crc32_combine64_gen
# else
# define gzopen gzopen64
# define gzseek gzseek64
# define gzoffset gzoffset64
# define adler32_combine adler32_combine64
# define crc32_combine crc32_combine64
+# define crc32_combine_gen crc32_combine_gen64
# endif
# ifndef Z_LARGE64
ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
ZEXTERN z_off_t ZEXPORT gzoffset64 OF((gzFile));
ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
+ ZEXTERN void ZEXPORT crc32_combine_gen64 OF((z_crc_t *op, z_off_t));
# endif
#else
ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *));
ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile));
ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
+ ZEXTERN void ZEXPORT crc32_combine_gen OF((z_crc_t *op, z_off_t));
#endif
#else /* Z_SOLO */
ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
+ ZEXTERN void ZEXPORT crc32_combine_gen OF((z_crc_t *op, z_off_t));
#endif /* !Z_SOLO */