241 lines
9.6 KiB
PHP
241 lines
9.6 KiB
PHP
; zlib.inc -- interface of the 'zlib' general purpose compression library
|
|
; version 1.2.8, April 28th, 2013
|
|
|
|
; Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler
|
|
|
|
; This software is provided 'as-is', without any express or implied
|
|
; warranty. In no event will the authors be held liable for any damages
|
|
; arising from the use of this software.
|
|
|
|
; Permission is granted to anyone to use this software for any purpose,
|
|
; including commercial applications, and to alter it and redistribute it
|
|
; freely, subject to the following restrictions:
|
|
|
|
; 1. The origin of this software must not be misrepresented; you must not
|
|
; claim that you wrote the original software. If you use this software
|
|
; in a product, an acknowledgment in the product documentation would be
|
|
; appreciated but is not required.
|
|
; 2. Altered source versions must be plainly marked as such, and must not be
|
|
; misrepresented as being the original software.
|
|
; 3. This notice may not be removed or altered from any source distribution.
|
|
|
|
; Jean-loup Gailly Mark Adler
|
|
; jloup@gzip.org madler@alumni.caltech.edu
|
|
|
|
|
|
; The data format used by the zlib library is described by RFCs (Request for
|
|
; Comments) 1950 to 1952 in the files http://tools.ietf.org/html/rfc1950
|
|
; (zlib format), rfc1951 (deflate format) and rfc1952 (gzip format).
|
|
|
|
|
|
include 'zconf.inc'
|
|
|
|
align 4
|
|
ZLIB_VERSION db '1.2.8',0
|
|
ZLIB_VERNUM equ 0x1280
|
|
ZLIB_VER_MAJOR equ 1
|
|
ZLIB_VER_MINOR equ 2
|
|
ZLIB_VER_REVISION equ 8
|
|
ZLIB_VER_SUBREVISION equ 0
|
|
|
|
|
|
; The 'zlib' compression library provides in-memory compression and
|
|
; decompression functions, including integrity checks of the uncompressed data.
|
|
; This version of the library supports only one compression method (deflation)
|
|
; but other algorithms will be added later and will have the same stream
|
|
; interface.
|
|
|
|
; Compression can be done in a single step if the buffers are large enough,
|
|
; or can be done by repeated calls of the compression function. In the latter
|
|
; case, the application must provide more input and/or consume the output
|
|
; (providing more output space) before each call.
|
|
|
|
; The compressed data format used by default by the in-memory functions is
|
|
; the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped
|
|
; around a deflate stream, which is itself documented in RFC 1951.
|
|
|
|
; The library also supports reading and writing files in gzip (.gz) format
|
|
; with an interface similar to that of stdio using the functions that start
|
|
; with "gz". The gzip format is different from the zlib format. gzip is a
|
|
; gzip wrapper, documented in RFC 1952, wrapped around a deflate stream.
|
|
|
|
; This library can optionally read and write gzip streams in memory as well.
|
|
|
|
; The zlib format was designed to be compact and fast for use in memory
|
|
; and on communications channels. The gzip format was designed for single-
|
|
; file compression on file systems, has a larger header than zlib to maintain
|
|
; directory information, and uses a different, slower check method than zlib.
|
|
|
|
; The library does not install any signal handler. The decoder checks
|
|
; the consistency of the compressed data, so the library should never crash
|
|
; even in case of corrupted input.
|
|
|
|
struct z_stream ;z_stream_s
|
|
next_in dd ? ;z_const Bytef * ;next input byte
|
|
avail_in dd ? ;uInt ;number of bytes available at next_in
|
|
total_in dd ? ;uLong ;total number of input bytes read so far
|
|
|
|
next_out dd ? ;Bytef * ;next output byte should be put there
|
|
avail_out dw ? ;uInt ;remaining free space at next_out
|
|
total_out dd ? ;uLong ;total number of bytes output so far
|
|
|
|
msg dd ? ;z_const char * ;last error message, NULL if no error
|
|
state dd ? ;deflate_state* ;not visible by applications
|
|
|
|
zalloc dd ? ;alloc_func ;used to allocate the internal state
|
|
zfree dd ? ;free_func ;used to free the internal state
|
|
opaque dd ? ;voidpf ;private data object passed to zalloc and zfree
|
|
|
|
data_type dw ? ;int ;best guess about the data type: binary or text
|
|
adler dd ? ;uLong ;adler32 value of the uncompressed data
|
|
reserved dd ? ;uLong ;reserved for future use
|
|
ends
|
|
|
|
; gzip header information passed to and from zlib routines. See RFC 1952
|
|
; for more details on the meanings of these fields.
|
|
|
|
struct gz_header ;_s
|
|
text dd ? ;int ;true if compressed data believed to be text
|
|
time dd ? ;uLong ;modification time
|
|
xflags dd ? ;int ;extra flags (not used when writing a gzip file)
|
|
os dd ? ;int ;operating system
|
|
extra dd ? ;Bytef* ;pointer to extra field or Z_NULL if none
|
|
extra_len dd ? ;uInt ;extra field length (valid if extra != Z_NULL)
|
|
extra_max dd ? ;uInt ;space at extra (only when reading header)
|
|
name dd ? ;Bytef* ;pointer to zero-terminated file name or Z_NULL
|
|
name_max dd ? ;uInt ;space at name (only when reading header)
|
|
comment dd ? ;Bytef* ;pointer to zero-terminated comment or Z_NULL
|
|
comm_max dd ? ;uInt ;space at comment (only when reading header)
|
|
hcrc dd ? ;int ;true if there was or will be a header crc
|
|
done dd ? ;int ;true when done reading gzip header (not used
|
|
;when writing a gzip file)
|
|
ends
|
|
|
|
|
|
; The application must update next_in and avail_in when avail_in has dropped
|
|
; to zero. It must update next_out and avail_out when avail_out has dropped
|
|
; to zero. The application must initialize zalloc, zfree and opaque before
|
|
; calling the init function. All other fields are set by the compression
|
|
; library and must not be updated by the application.
|
|
|
|
; The opaque value provided by the application will be passed as the first
|
|
; parameter for calls of zalloc and zfree. This can be useful for custom
|
|
; memory management. The compression library attaches no meaning to the
|
|
; opaque value.
|
|
|
|
; zalloc must return Z_NULL if there is not enough memory for the object.
|
|
; If zlib is used in a multi-threaded application, zalloc and zfree must be
|
|
; thread safe.
|
|
|
|
; On 16-bit systems, the functions zalloc and zfree must be able to allocate
|
|
; exactly 65536 bytes, but will not be required to allocate more than this if
|
|
; the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS, pointers
|
|
; returned by zalloc for objects of exactly 65536 bytes *must* have their
|
|
; offset normalized to zero. The default allocation function provided by this
|
|
; library ensures this (see zutil.c). To reduce memory requirements and avoid
|
|
; any allocation of 64K objects, at the expense of compression ratio, compile
|
|
; the library with -DMAX_WBITS=14 (see zconf.h).
|
|
|
|
; The fields total_in and total_out can be used for statistics or progress
|
|
; reports. After compression, total_in holds the total size of the
|
|
; uncompressed data and may be saved for use in the decompressor (particularly
|
|
; if the decompressor wants to decompress everything in a single step).
|
|
|
|
|
|
; constants
|
|
|
|
Z_NO_FLUSH equ 0
|
|
Z_PARTIAL_FLUSH equ 1
|
|
Z_SYNC_FLUSH equ 2
|
|
Z_FULL_FLUSH equ 3
|
|
Z_FINISH equ 4
|
|
Z_BLOCK equ 5
|
|
Z_TREES equ 6
|
|
; Allowed flush values; see deflate() and inflate() below for details
|
|
|
|
Z_OK equ 0
|
|
Z_STREAM_END equ 1
|
|
Z_NEED_DICT equ 2
|
|
Z_ERRNO equ (-1)
|
|
Z_STREAM_ERROR equ (-2)
|
|
Z_DATA_ERROR equ (-3)
|
|
Z_MEM_ERROR equ (-4)
|
|
Z_BUF_ERROR equ (-5)
|
|
Z_VERSION_ERROR equ (-6)
|
|
; Return codes for the compression/decompression functions. Negative values
|
|
; are errors, positive values are used for special but normal events.
|
|
|
|
|
|
Z_NO_COMPRESSION equ 0
|
|
Z_BEST_SPEED equ 1
|
|
Z_BEST_COMPRESSION equ 9
|
|
Z_DEFAULT_COMPRESSION equ (-1)
|
|
; compression levels
|
|
|
|
Z_FILTERED equ 1
|
|
Z_HUFFMAN_ONLY equ 2
|
|
Z_RLE equ 3
|
|
Z_FIXED equ 4
|
|
Z_DEFAULT_STRATEGY equ 0
|
|
; compression strategy; see deflateInit2() below for details
|
|
|
|
Z_BINARY equ 0
|
|
Z_TEXT equ 1
|
|
Z_ASCII equ Z_TEXT ;for compatibility with 1.2.2 and earlier
|
|
Z_UNKNOWN equ 2
|
|
; Possible values of the data_type field (though see inflate())
|
|
|
|
Z_DEFLATED equ 8
|
|
; The deflate compression method (the only one supported in this version)
|
|
|
|
Z_NULL equ 0 ;for initializing zalloc, zfree, opaque
|
|
|
|
zlib_version equ zlibVersion
|
|
; for compatibility with versions < 1.0.2
|
|
|
|
; various hacks, don't look :)
|
|
|
|
; deflateInit and inflateInit are macros to allow checking the zlib version
|
|
; and the compiler's view of z_stream:
|
|
|
|
;int inflateBackInit_ OF((z_streamp strm, int windowBits,
|
|
; unsigned char FAR *window,
|
|
; const char *version,
|
|
; int stream_size));
|
|
;#define inflateInit(strm) \
|
|
; inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream))
|
|
|
|
;#define inflateInit2(strm, windowBits) \
|
|
; inflateInit2_((strm), (windowBits), ZLIB_VERSION, \
|
|
; (int)sizeof(z_stream))
|
|
;#define inflateBackInit(strm, windowBits, window) \
|
|
; inflateBackInit_((strm), (windowBits), (window), \
|
|
; ZLIB_VERSION, (int)sizeof(z_stream))
|
|
|
|
if Z_SOLO eq 0
|
|
|
|
; gzgetc() macro and its supporting function and exposed data structure. Note
|
|
; that the real internal state is much larger than the exposed structure.
|
|
; This abbreviated structure exposes just enough for the gzgetc() macro. The
|
|
; user should not mess with these exposed elements, since their names or
|
|
; behavior could change in the future, perhaps even capriciously. They can
|
|
; only be used by the gzgetc() macro. You have been warned.
|
|
|
|
;struct gzFile_s {
|
|
; unsigned have;
|
|
; unsigned char *next;
|
|
; z_off64_t pos;
|
|
;};
|
|
|
|
if Z_PREFIX_SET eq 1
|
|
;# undef z_gzgetc
|
|
;# define z_gzgetc(g) \
|
|
; ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : gzgetc(g))
|
|
else
|
|
;# define gzgetc(g) \
|
|
; ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : gzgetc(g))
|
|
end if
|
|
|
|
end if
|
|
|