277 lines
9.9 KiB
ObjectPascal
277 lines
9.9 KiB
ObjectPascal
(* zlibpas -- Pascal interface to the zlib data compression library
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*
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* Copyright (C) 2003 Cosmin Truta.
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* Derived from original sources by Bob Dellaca.
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* For conditions of distribution and use, see copyright notice in readme.txt
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*)
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unit zlibpas;
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interface
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const
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ZLIB_VERSION = '1.3.1';
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ZLIB_VERNUM = $12a0;
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type
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alloc_func = function(opaque: Pointer; items, size: Integer): Pointer;
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cdecl;
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free_func = procedure(opaque, address: Pointer);
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cdecl;
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in_func = function(opaque: Pointer; var buf: PByte): Integer;
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cdecl;
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out_func = function(opaque: Pointer; buf: PByte; size: Integer): Integer;
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cdecl;
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z_streamp = ^z_stream;
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z_stream = packed record
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next_in: PChar; (* next input byte *)
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avail_in: Integer; (* number of bytes available at next_in *)
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total_in: LongInt; (* total nb of input bytes read so far *)
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next_out: PChar; (* next output byte should be put there *)
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avail_out: Integer; (* remaining free space at next_out *)
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total_out: LongInt; (* total nb of bytes output so far *)
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msg: PChar; (* last error message, NULL if no error *)
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state: Pointer; (* not visible by applications *)
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zalloc: alloc_func; (* used to allocate the internal state *)
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zfree: free_func; (* used to free the internal state *)
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opaque: Pointer; (* private data object passed to zalloc and zfree *)
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data_type: Integer; (* best guess about the data type: ascii or binary *)
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adler: LongInt; (* adler32 value of the uncompressed data *)
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reserved: LongInt; (* reserved for future use *)
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end;
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gz_headerp = ^gz_header;
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gz_header = packed record
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text: Integer; (* true if compressed data believed to be text *)
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time: LongInt; (* modification time *)
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xflags: Integer; (* extra flags (not used when writing a gzip file) *)
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os: Integer; (* operating system *)
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extra: PChar; (* pointer to extra field or Z_NULL if none *)
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extra_len: Integer; (* extra field length (valid if extra != Z_NULL) *)
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extra_max: Integer; (* space at extra (only when reading header) *)
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name: PChar; (* pointer to zero-terminated file name or Z_NULL *)
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name_max: Integer; (* space at name (only when reading header) *)
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comment: PChar; (* pointer to zero-terminated comment or Z_NULL *)
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comm_max: Integer; (* space at comment (only when reading header) *)
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hcrc: Integer; (* true if there was or will be a header crc *)
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done: Integer; (* true when done reading gzip header *)
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end;
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(* constants *)
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const
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Z_NO_FLUSH = 0;
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Z_PARTIAL_FLUSH = 1;
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Z_SYNC_FLUSH = 2;
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Z_FULL_FLUSH = 3;
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Z_FINISH = 4;
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Z_BLOCK = 5;
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Z_TREES = 6;
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Z_OK = 0;
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Z_STREAM_END = 1;
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Z_NEED_DICT = 2;
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Z_ERRNO = -1;
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Z_STREAM_ERROR = -2;
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Z_DATA_ERROR = -3;
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Z_MEM_ERROR = -4;
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Z_BUF_ERROR = -5;
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Z_VERSION_ERROR = -6;
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Z_NO_COMPRESSION = 0;
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Z_BEST_SPEED = 1;
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Z_BEST_COMPRESSION = 9;
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Z_DEFAULT_COMPRESSION = -1;
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Z_FILTERED = 1;
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Z_HUFFMAN_ONLY = 2;
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Z_RLE = 3;
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Z_FIXED = 4;
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Z_DEFAULT_STRATEGY = 0;
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Z_BINARY = 0;
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Z_TEXT = 1;
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Z_ASCII = 1;
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Z_UNKNOWN = 2;
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Z_DEFLATED = 8;
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(* basic functions *)
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function zlibVersion: PChar;
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function deflateInit(var strm: z_stream; level: Integer): Integer;
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function deflate(var strm: z_stream; flush: Integer): Integer;
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function deflateEnd(var strm: z_stream): Integer;
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function inflateInit(var strm: z_stream): Integer;
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function inflate(var strm: z_stream; flush: Integer): Integer;
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function inflateEnd(var strm: z_stream): Integer;
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(* advanced functions *)
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function deflateInit2(var strm: z_stream; level, method, windowBits,
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memLevel, strategy: Integer): Integer;
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function deflateSetDictionary(var strm: z_stream; const dictionary: PChar;
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dictLength: Integer): Integer;
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function deflateCopy(var dest, source: z_stream): Integer;
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function deflateReset(var strm: z_stream): Integer;
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function deflateParams(var strm: z_stream; level, strategy: Integer): Integer;
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function deflateTune(var strm: z_stream; good_length, max_lazy, nice_length, max_chain: Integer): Integer;
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function deflateBound(var strm: z_stream; sourceLen: LongInt): LongInt;
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function deflatePending(var strm: z_stream; var pending: Integer; var bits: Integer): Integer;
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function deflatePrime(var strm: z_stream; bits, value: Integer): Integer;
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function deflateSetHeader(var strm: z_stream; head: gz_header): Integer;
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function inflateInit2(var strm: z_stream; windowBits: Integer): Integer;
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function inflateSetDictionary(var strm: z_stream; const dictionary: PChar;
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dictLength: Integer): Integer;
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function inflateSync(var strm: z_stream): Integer;
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function inflateCopy(var dest, source: z_stream): Integer;
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function inflateReset(var strm: z_stream): Integer;
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function inflateReset2(var strm: z_stream; windowBits: Integer): Integer;
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function inflatePrime(var strm: z_stream; bits, value: Integer): Integer;
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function inflateMark(var strm: z_stream): LongInt;
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function inflateGetHeader(var strm: z_stream; var head: gz_header): Integer;
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function inflateBackInit(var strm: z_stream;
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windowBits: Integer; window: PChar): Integer;
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function inflateBack(var strm: z_stream; in_fn: in_func; in_desc: Pointer;
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out_fn: out_func; out_desc: Pointer): Integer;
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function inflateBackEnd(var strm: z_stream): Integer;
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function zlibCompileFlags: LongInt;
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(* utility functions *)
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function compress(dest: PChar; var destLen: LongInt;
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const source: PChar; sourceLen: LongInt): Integer;
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function compress2(dest: PChar; var destLen: LongInt;
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const source: PChar; sourceLen: LongInt;
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level: Integer): Integer;
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function compressBound(sourceLen: LongInt): LongInt;
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function uncompress(dest: PChar; var destLen: LongInt;
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const source: PChar; sourceLen: LongInt): Integer;
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(* checksum functions *)
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function adler32(adler: LongInt; const buf: PChar; len: Integer): LongInt;
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function adler32_combine(adler1, adler2, len2: LongInt): LongInt;
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function crc32(crc: LongInt; const buf: PChar; len: Integer): LongInt;
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function crc32_combine(crc1, crc2, len2: LongInt): LongInt;
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(* various hacks, don't look :) *)
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function deflateInit_(var strm: z_stream; level: Integer;
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const version: PChar; stream_size: Integer): Integer;
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function inflateInit_(var strm: z_stream; const version: PChar;
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stream_size: Integer): Integer;
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function deflateInit2_(var strm: z_stream;
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level, method, windowBits, memLevel, strategy: Integer;
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const version: PChar; stream_size: Integer): Integer;
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function inflateInit2_(var strm: z_stream; windowBits: Integer;
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const version: PChar; stream_size: Integer): Integer;
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function inflateBackInit_(var strm: z_stream;
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windowBits: Integer; window: PChar;
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const version: PChar; stream_size: Integer): Integer;
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implementation
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{$L adler32.obj}
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{$L compress.obj}
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{$L crc32.obj}
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{$L deflate.obj}
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{$L infback.obj}
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{$L inffast.obj}
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{$L inflate.obj}
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{$L inftrees.obj}
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{$L trees.obj}
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{$L uncompr.obj}
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{$L zutil.obj}
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function adler32; external;
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function adler32_combine; external;
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function compress; external;
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function compress2; external;
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function compressBound; external;
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function crc32; external;
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function crc32_combine; external;
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function deflate; external;
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function deflateBound; external;
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function deflateCopy; external;
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function deflateEnd; external;
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function deflateInit_; external;
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function deflateInit2_; external;
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function deflateParams; external;
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function deflatePending; external;
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function deflatePrime; external;
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function deflateReset; external;
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function deflateSetDictionary; external;
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function deflateSetHeader; external;
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function deflateTune; external;
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function inflate; external;
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function inflateBack; external;
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function inflateBackEnd; external;
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function inflateBackInit_; external;
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function inflateCopy; external;
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function inflateEnd; external;
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function inflateGetHeader; external;
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function inflateInit_; external;
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function inflateInit2_; external;
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function inflateMark; external;
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function inflatePrime; external;
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function inflateReset; external;
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function inflateReset2; external;
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function inflateSetDictionary; external;
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function inflateSync; external;
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function uncompress; external;
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function zlibCompileFlags; external;
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function zlibVersion; external;
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function deflateInit(var strm: z_stream; level: Integer): Integer;
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begin
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Result := deflateInit_(strm, level, ZLIB_VERSION, sizeof(z_stream));
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end;
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function deflateInit2(var strm: z_stream; level, method, windowBits, memLevel,
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strategy: Integer): Integer;
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begin
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Result := deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
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ZLIB_VERSION, sizeof(z_stream));
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end;
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function inflateInit(var strm: z_stream): Integer;
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begin
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Result := inflateInit_(strm, ZLIB_VERSION, sizeof(z_stream));
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end;
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function inflateInit2(var strm: z_stream; windowBits: Integer): Integer;
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begin
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Result := inflateInit2_(strm, windowBits, ZLIB_VERSION, sizeof(z_stream));
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end;
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function inflateBackInit(var strm: z_stream;
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windowBits: Integer; window: PChar): Integer;
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begin
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Result := inflateBackInit_(strm, windowBits, window,
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ZLIB_VERSION, sizeof(z_stream));
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end;
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function _malloc(Size: Integer): Pointer; cdecl;
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begin
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GetMem(Result, Size);
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end;
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procedure _free(Block: Pointer); cdecl;
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begin
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FreeMem(Block);
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end;
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procedure _memset(P: Pointer; B: Byte; count: Integer); cdecl;
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begin
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FillChar(P^, count, B);
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end;
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procedure _memcpy(dest, source: Pointer; count: Integer); cdecl;
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begin
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Move(source^, dest^, count);
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end;
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end.
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