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(* zlibpas -- Pascal interface to the zlib data compression library
*
* Copyright (C) 2003 Cosmin Truta.
* Derived from original sources by Bob Dellaca.
* For conditions of distribution and use, see copyright notice in readme.txt
*)
unit zlibpas;
interface
const
ZLIB_VERSION = '1.2.10';
ZLIB_VERNUM = $12a0;
type
alloc_func = function(opaque: Pointer; items, size: Integer): Pointer;
cdecl;
free_func = procedure(opaque, address: Pointer);
cdecl;
in_func = function(opaque: Pointer; var buf: PByte): Integer;
cdecl;
out_func = function(opaque: Pointer; buf: PByte; size: Integer): Integer;
cdecl;
z_streamp = ^z_stream;
z_stream = packed record
next_in: PChar; (* next input byte *)
avail_in: Integer; (* number of bytes available at next_in *)
total_in: LongInt; (* total nb of input bytes read so far *)
next_out: PChar; (* next output byte should be put there *)
avail_out: Integer; (* remaining free space at next_out *)
total_out: LongInt; (* total nb of bytes output so far *)
msg: PChar; (* last error message, NULL if no error *)
state: Pointer; (* not visible by applications *)
zalloc: alloc_func; (* used to allocate the internal state *)
zfree: free_func; (* used to free the internal state *)
opaque: Pointer; (* private data object passed to zalloc and zfree *)
data_type: Integer; (* best guess about the data type: ascii or binary *)
adler: LongInt; (* adler32 value of the uncompressed data *)
reserved: LongInt; (* reserved for future use *)
end;
gz_headerp = ^gz_header;
gz_header = packed record
text: Integer; (* true if compressed data believed to be text *)
time: LongInt; (* modification time *)
xflags: Integer; (* extra flags (not used when writing a gzip file) *)
os: Integer; (* operating system *)
extra: PChar; (* pointer to extra field or Z_NULL if none *)
extra_len: Integer; (* extra field length (valid if extra != Z_NULL) *)
extra_max: Integer; (* space at extra (only when reading header) *)
name: PChar; (* pointer to zero-terminated file name or Z_NULL *)
name_max: Integer; (* space at name (only when reading header) *)
comment: PChar; (* pointer to zero-terminated comment or Z_NULL *)
comm_max: Integer; (* space at comment (only when reading header) *)
hcrc: Integer; (* true if there was or will be a header crc *)
done: Integer; (* true when done reading gzip header *)
end;
(* constants *)
const
Z_NO_FLUSH = 0;
Z_PARTIAL_FLUSH = 1;
Z_SYNC_FLUSH = 2;
Z_FULL_FLUSH = 3;
Z_FINISH = 4;
Z_BLOCK = 5;
Z_TREES = 6;
Z_OK = 0;
Z_STREAM_END = 1;
Z_NEED_DICT = 2;
Z_ERRNO = -1;
Z_STREAM_ERROR = -2;
Z_DATA_ERROR = -3;
Z_MEM_ERROR = -4;
Z_BUF_ERROR = -5;
Z_VERSION_ERROR = -6;
Z_NO_COMPRESSION = 0;
Z_BEST_SPEED = 1;
Z_BEST_COMPRESSION = 9;
Z_DEFAULT_COMPRESSION = -1;
Z_FILTERED = 1;
Z_HUFFMAN_ONLY = 2;
Z_RLE = 3;
Z_FIXED = 4;
Z_DEFAULT_STRATEGY = 0;
Z_BINARY = 0;
Z_TEXT = 1;
Z_ASCII = 1;
Z_UNKNOWN = 2;
Z_DEFLATED = 8;
(* basic functions *)
function zlibVersion: PChar;
function deflateInit(var strm: z_stream; level: Integer): Integer;
function deflate(var strm: z_stream; flush: Integer): Integer;
function deflateEnd(var strm: z_stream): Integer;
function inflateInit(var strm: z_stream): Integer;
function inflate(var strm: z_stream; flush: Integer): Integer;
function inflateEnd(var strm: z_stream): Integer;
(* advanced functions *)
function deflateInit2(var strm: z_stream; level, method, windowBits,
memLevel, strategy: Integer): Integer;
function deflateSetDictionary(var strm: z_stream; const dictionary: PChar;
dictLength: Integer): Integer;
function deflateCopy(var dest, source: z_stream): Integer;
function deflateReset(var strm: z_stream): Integer;
function deflateParams(var strm: z_stream; level, strategy: Integer): Integer;
function deflateTune(var strm: z_stream; good_length, max_lazy, nice_length, max_chain: Integer): Integer;
function deflateBound(var strm: z_stream; sourceLen: LongInt): LongInt;
function deflatePending(var strm: z_stream; var pending: Integer; var bits: Integer): Integer;
function deflatePrime(var strm: z_stream; bits, value: Integer): Integer;
function deflateSetHeader(var strm: z_stream; head: gz_header): Integer;
function inflateInit2(var strm: z_stream; windowBits: Integer): Integer;
function inflateSetDictionary(var strm: z_stream; const dictionary: PChar;
dictLength: Integer): Integer;
function inflateSync(var strm: z_stream): Integer;
function inflateCopy(var dest, source: z_stream): Integer;
function inflateReset(var strm: z_stream): Integer;
function inflateReset2(var strm: z_stream; windowBits: Integer): Integer;
function inflatePrime(var strm: z_stream; bits, value: Integer): Integer;
function inflateMark(var strm: z_stream): LongInt;
function inflateGetHeader(var strm: z_stream; var head: gz_header): Integer;
function inflateBackInit(var strm: z_stream;
windowBits: Integer; window: PChar): Integer;
function inflateBack(var strm: z_stream; in_fn: in_func; in_desc: Pointer;
out_fn: out_func; out_desc: Pointer): Integer;
function inflateBackEnd(var strm: z_stream): Integer;
function zlibCompileFlags: LongInt;
(* utility functions *)
function compress(dest: PChar; var destLen: LongInt;
const source: PChar; sourceLen: LongInt): Integer;
function compress2(dest: PChar; var destLen: LongInt;
const source: PChar; sourceLen: LongInt;
level: Integer): Integer;
function compressBound(sourceLen: LongInt): LongInt;
function uncompress(dest: PChar; var destLen: LongInt;
const source: PChar; sourceLen: LongInt): Integer;
(* checksum functions *)
function adler32(adler: LongInt; const buf: PChar; len: Integer): LongInt;
function adler32_combine(adler1, adler2, len2: LongInt): LongInt;
function crc32(crc: LongInt; const buf: PChar; len: Integer): LongInt;
function crc32_combine(crc1, crc2, len2: LongInt): LongInt;
(* various hacks, don't look :) *)
function deflateInit_(var strm: z_stream; level: Integer;
const version: PChar; stream_size: Integer): Integer;
function inflateInit_(var strm: z_stream; const version: PChar;
stream_size: Integer): Integer;
function deflateInit2_(var strm: z_stream;
level, method, windowBits, memLevel, strategy: Integer;
const version: PChar; stream_size: Integer): Integer;
function inflateInit2_(var strm: z_stream; windowBits: Integer;
const version: PChar; stream_size: Integer): Integer;
function inflateBackInit_(var strm: z_stream;
windowBits: Integer; window: PChar;
const version: PChar; stream_size: Integer): Integer;
implementation
{$L adler32.obj}
{$L compress.obj}
{$L crc32.obj}
{$L deflate.obj}
{$L infback.obj}
{$L inffast.obj}
{$L inflate.obj}
{$L inftrees.obj}
{$L trees.obj}
{$L uncompr.obj}
{$L zutil.obj}
function adler32; external;
function adler32_combine; external;
function compress; external;
function compress2; external;
function compressBound; external;
function crc32; external;
function crc32_combine; external;
function deflate; external;
function deflateBound; external;
function deflateCopy; external;
function deflateEnd; external;
function deflateInit_; external;
function deflateInit2_; external;
function deflateParams; external;
function deflatePending; external;
function deflatePrime; external;
function deflateReset; external;
function deflateSetDictionary; external;
function deflateSetHeader; external;
function deflateTune; external;
function inflate; external;
function inflateBack; external;
function inflateBackEnd; external;
function inflateBackInit_; external;
function inflateCopy; external;
function inflateEnd; external;
function inflateGetHeader; external;
function inflateInit_; external;
function inflateInit2_; external;
function inflateMark; external;
function inflatePrime; external;
function inflateReset; external;
function inflateReset2; external;
function inflateSetDictionary; external;
function inflateSync; external;
function uncompress; external;
function zlibCompileFlags; external;
function zlibVersion; external;
function deflateInit(var strm: z_stream; level: Integer): Integer;
begin
Result := deflateInit_(strm, level, ZLIB_VERSION, sizeof(z_stream));
end;
function deflateInit2(var strm: z_stream; level, method, windowBits, memLevel,
strategy: Integer): Integer;
begin
Result := deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
ZLIB_VERSION, sizeof(z_stream));
end;
function inflateInit(var strm: z_stream): Integer;
begin
Result := inflateInit_(strm, ZLIB_VERSION, sizeof(z_stream));
end;
function inflateInit2(var strm: z_stream; windowBits: Integer): Integer;
begin
Result := inflateInit2_(strm, windowBits, ZLIB_VERSION, sizeof(z_stream));
end;
function inflateBackInit(var strm: z_stream;
windowBits: Integer; window: PChar): Integer;
begin
Result := inflateBackInit_(strm, windowBits, window,
ZLIB_VERSION, sizeof(z_stream));
end;
function _malloc(Size: Integer): Pointer; cdecl;
begin
GetMem(Result, Size);
end;
procedure _free(Block: Pointer); cdecl;
begin
FreeMem(Block);
end;
procedure _memset(P: Pointer; B: Byte; count: Integer); cdecl;
begin
FillChar(P^, count, B);
end;
procedure _memcpy(dest, source: Pointer; count: Integer); cdecl;
begin
Move(source^, dest^, count);
end;
end.
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