diff options
Diffstat (limited to 'zlib-1.1.4/contrib/delphi2/zlib.pas')
| -rw-r--r-- | zlib-1.1.4/contrib/delphi2/zlib.pas | 534 |
1 files changed, 534 insertions, 0 deletions
diff --git a/zlib-1.1.4/contrib/delphi2/zlib.pas b/zlib-1.1.4/contrib/delphi2/zlib.pas new file mode 100644 index 0000000..10ae4ca --- /dev/null +++ b/zlib-1.1.4/contrib/delphi2/zlib.pas @@ -0,0 +1,534 @@ +{*******************************************************} +{ } +{ Delphi Supplemental Components } +{ ZLIB Data Compression Interface Unit } +{ } +{ Copyright (c) 1997 Borland International } +{ } +{*******************************************************} + +{ Modified for zlib 1.1.3 by Davide Moretti <dave@rimini.com } + +unit zlib; + +interface + +uses Sysutils, Classes; + +type + TAlloc = function (AppData: Pointer; Items, Size: Integer): Pointer; + TFree = procedure (AppData, Block: Pointer); + + // Internal structure. Ignore. + TZStreamRec = packed record + next_in: PChar; // next input byte + avail_in: Integer; // number of bytes available at next_in + total_in: Integer; // total nb of input bytes read so far + + next_out: PChar; // next output byte should be put here + avail_out: Integer; // remaining free space at next_out + total_out: Integer; // total nb of bytes output so far + + msg: PChar; // last error message, NULL if no error + internal: Pointer; // not visible by applications + + zalloc: TAlloc; // used to allocate the internal state + zfree: TFree; // used to free the internal state + AppData: Pointer; // private data object passed to zalloc and zfree + + data_type: Integer; // best guess about the data type: ascii or binary + adler: Integer; // adler32 value of the uncompressed data + reserved: Integer; // reserved for future use + end; + + // Abstract ancestor class + TCustomZlibStream = class(TStream) + private + FStrm: TStream; + FStrmPos: Integer; + FOnProgress: TNotifyEvent; + FZRec: TZStreamRec; + FBuffer: array [Word] of Char; + protected + procedure Progress(Sender: TObject); dynamic; + property OnProgress: TNotifyEvent read FOnProgress write FOnProgress; + constructor Create(Strm: TStream); + end; + +{ TCompressionStream compresses data on the fly as data is written to it, and + stores the compressed data to another stream. + + TCompressionStream is write-only and strictly sequential. Reading from the + stream will raise an exception. Using Seek to move the stream pointer + will raise an exception. + + Output data is cached internally, written to the output stream only when + the internal output buffer is full. All pending output data is flushed + when the stream is destroyed. + + The Position property returns the number of uncompressed bytes of + data that have been written to the stream so far. + + CompressionRate returns the on-the-fly percentage by which the original + data has been compressed: (1 - (CompressedBytes / UncompressedBytes)) * 100 + If raw data size = 100 and compressed data size = 25, the CompressionRate + is 75% + + The OnProgress event is called each time the output buffer is filled and + written to the output stream. This is useful for updating a progress + indicator when you are writing a large chunk of data to the compression + stream in a single call.} + + + TCompressionLevel = (clNone, clFastest, clDefault, clMax); + + TCompressionStream = class(TCustomZlibStream) + private + function GetCompressionRate: Single; + public + constructor Create(CompressionLevel: TCompressionLevel; Dest: TStream); + destructor Destroy; override; + function Read(var Buffer; Count: Longint): Longint; override; + function Write(const Buffer; Count: Longint): Longint; override; + function Seek(Offset: Longint; Origin: Word): Longint; override; + property CompressionRate: Single read GetCompressionRate; + property OnProgress; + end; + +{ TDecompressionStream decompresses data on the fly as data is read from it. + + Compressed data comes from a separate source stream. TDecompressionStream + is read-only and unidirectional; you can seek forward in the stream, but not + backwards. The special case of setting the stream position to zero is + allowed. Seeking forward decompresses data until the requested position in + the uncompressed data has been reached. Seeking backwards, seeking relative + to the end of the stream, requesting the size of the stream, and writing to + the stream will raise an exception. + + The Position property returns the number of bytes of uncompressed data that + have been read from the stream so far. + + The OnProgress event is called each time the internal input buffer of + compressed data is exhausted and the next block is read from the input stream. + This is useful for updating a progress indicator when you are reading a + large chunk of data from the decompression stream in a single call.} + + TDecompressionStream = class(TCustomZlibStream) + public + constructor Create(Source: TStream); + destructor Destroy; override; + function Read(var Buffer; Count: Longint): Longint; override; + function Write(const Buffer; Count: Longint): Longint; override; + function Seek(Offset: Longint; Origin: Word): Longint; override; + property OnProgress; + end; + + + +{ CompressBuf compresses data, buffer to buffer, in one call. + In: InBuf = ptr to compressed data + InBytes = number of bytes in InBuf + Out: OutBuf = ptr to newly allocated buffer containing decompressed data + OutBytes = number of bytes in OutBuf } +procedure CompressBuf(const InBuf: Pointer; InBytes: Integer; + out OutBuf: Pointer; out OutBytes: Integer); + + +{ DecompressBuf decompresses data, buffer to buffer, in one call. + In: InBuf = ptr to compressed data + InBytes = number of bytes in InBuf + OutEstimate = zero, or est. size of the decompressed data + Out: OutBuf = ptr to newly allocated buffer containing decompressed data + OutBytes = number of bytes in OutBuf } +procedure DecompressBuf(const InBuf: Pointer; InBytes: Integer; + OutEstimate: Integer; out OutBuf: Pointer; out OutBytes: Integer); + +const + zlib_version = '1.1.3'; + +type + EZlibError = class(Exception); + ECompressionError = class(EZlibError); + EDecompressionError = class(EZlibError); + +function adler32(adler: Integer; buf: PChar; len: Integer): Integer; + +implementation + +const + Z_NO_FLUSH = 0; + Z_PARTIAL_FLUSH = 1; + Z_SYNC_FLUSH = 2; + Z_FULL_FLUSH = 3; + Z_FINISH = 4; + + 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_DEFAULT_STRATEGY = 0; + + Z_BINARY = 0; + Z_ASCII = 1; + Z_UNKNOWN = 2; + + Z_DEFLATED = 8; + + _z_errmsg: array[0..9] of PChar = ( + 'need dictionary', // Z_NEED_DICT (2) + 'stream end', // Z_STREAM_END (1) + '', // Z_OK (0) + 'file error', // Z_ERRNO (-1) + 'stream error', // Z_STREAM_ERROR (-2) + 'data error', // Z_DATA_ERROR (-3) + 'insufficient memory', // Z_MEM_ERROR (-4) + 'buffer error', // Z_BUF_ERROR (-5) + 'incompatible version', // Z_VERSION_ERROR (-6) + '' + ); + +{$L deflate.obj} +{$L inflate.obj} +{$L inftrees.obj} +{$L trees.obj} +{$L adler32.obj} +{$L infblock.obj} +{$L infcodes.obj} +{$L infutil.obj} +{$L inffast.obj} + +procedure _tr_init; external; +procedure _tr_tally; external; +procedure _tr_flush_block; external; +procedure _tr_align; external; +procedure _tr_stored_block; external; +function adler32; external; +procedure inflate_blocks_new; external; +procedure inflate_blocks; external; +procedure inflate_blocks_reset; external; +procedure inflate_blocks_free; external; +procedure inflate_set_dictionary; external; +procedure inflate_trees_bits; external; +procedure inflate_trees_dynamic; external; +procedure inflate_trees_fixed; external; +procedure inflate_codes_new; external; +procedure inflate_codes; external; +procedure inflate_codes_free; external; +procedure _inflate_mask; external; +procedure inflate_flush; external; +procedure inflate_fast; external; + +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; + + + +// deflate compresses data +function deflateInit_(var strm: TZStreamRec; level: Integer; version: PChar; + recsize: Integer): Integer; external; +function deflate(var strm: TZStreamRec; flush: Integer): Integer; external; +function deflateEnd(var strm: TZStreamRec): Integer; external; + +// inflate decompresses data +function inflateInit_(var strm: TZStreamRec; version: PChar; + recsize: Integer): Integer; external; +function inflate(var strm: TZStreamRec; flush: Integer): Integer; external; +function inflateEnd(var strm: TZStreamRec): Integer; external; +function inflateReset(var strm: TZStreamRec): Integer; external; + + +function zcalloc(AppData: Pointer; Items, Size: Integer): Pointer; +begin + GetMem(Result, Items*Size); +end; + +procedure zcfree(AppData, Block: Pointer); +begin + FreeMem(Block); +end; + +function zlibCheck(code: Integer): Integer; +begin + Result := code; + if code < 0 then + raise EZlibError.Create('error'); //!! +end; + +function CCheck(code: Integer): Integer; +begin + Result := code; + if code < 0 then + raise ECompressionError.Create('error'); //!! +end; + +function DCheck(code: Integer): Integer; +begin + Result := code; + if code < 0 then + raise EDecompressionError.Create('error'); //!! +end; + +procedure CompressBuf(const InBuf: Pointer; InBytes: Integer; + out OutBuf: Pointer; out OutBytes: Integer); +var + strm: TZStreamRec; + P: Pointer; +begin + FillChar(strm, sizeof(strm), 0); + OutBytes := ((InBytes + (InBytes div 10) + 12) + 255) and not 255; + GetMem(OutBuf, OutBytes); + try + strm.next_in := InBuf; + strm.avail_in := InBytes; + strm.next_out := OutBuf; + strm.avail_out := OutBytes; + CCheck(deflateInit_(strm, Z_BEST_COMPRESSION, zlib_version, sizeof(strm))); + try + while CCheck(deflate(strm, Z_FINISH)) <> Z_STREAM_END do + begin + P := OutBuf; + Inc(OutBytes, 256); + ReallocMem(OutBuf, OutBytes); + strm.next_out := PChar(Integer(OutBuf) + (Integer(strm.next_out) - Integer(P))); + strm.avail_out := 256; + end; + finally + CCheck(deflateEnd(strm)); + end; + ReallocMem(OutBuf, strm.total_out); + OutBytes := strm.total_out; + except + FreeMem(OutBuf); + raise + end; +end; + + +procedure DecompressBuf(const InBuf: Pointer; InBytes: Integer; + OutEstimate: Integer; out OutBuf: Pointer; out OutBytes: Integer); +var + strm: TZStreamRec; + P: Pointer; + BufInc: Integer; +begin + FillChar(strm, sizeof(strm), 0); + BufInc := (InBytes + 255) and not 255; + if OutEstimate = 0 then + OutBytes := BufInc + else + OutBytes := OutEstimate; + GetMem(OutBuf, OutBytes); + try + strm.next_in := InBuf; + strm.avail_in := InBytes; + strm.next_out := OutBuf; + strm.avail_out := OutBytes; + DCheck(inflateInit_(strm, zlib_version, sizeof(strm))); + try + while DCheck(inflate(strm, Z_FINISH)) <> Z_STREAM_END do + begin + P := OutBuf; + Inc(OutBytes, BufInc); + ReallocMem(OutBuf, OutBytes); + strm.next_out := PChar(Integer(OutBuf) + (Integer(strm.next_out) - Integer(P))); + strm.avail_out := BufInc; + end; + finally + DCheck(inflateEnd(strm)); + end; + ReallocMem(OutBuf, strm.total_out); + OutBytes := strm.total_out; + except + FreeMem(OutBuf); + raise + end; +end; + + +// TCustomZlibStream + +constructor TCustomZLibStream.Create(Strm: TStream); +begin + inherited Create; + FStrm := Strm; + FStrmPos := Strm.Position; +end; + +procedure TCustomZLibStream.Progress(Sender: TObject); +begin + if Assigned(FOnProgress) then FOnProgress(Sender); +end; + + +// TCompressionStream + +constructor TCompressionStream.Create(CompressionLevel: TCompressionLevel; + Dest: TStream); +const + Levels: array [TCompressionLevel] of ShortInt = + (Z_NO_COMPRESSION, Z_BEST_SPEED, Z_DEFAULT_COMPRESSION, Z_BEST_COMPRESSION); +begin + inherited Create(Dest); + FZRec.next_out := FBuffer; + FZRec.avail_out := sizeof(FBuffer); + CCheck(deflateInit_(FZRec, Levels[CompressionLevel], zlib_version, sizeof(FZRec))); +end; + +destructor TCompressionStream.Destroy; +begin + FZRec.next_in := nil; + FZRec.avail_in := 0; + try + if FStrm.Position <> FStrmPos then FStrm.Position := FStrmPos; + while (CCheck(deflate(FZRec, Z_FINISH)) <> Z_STREAM_END) + and (FZRec.avail_out = 0) do + begin + FStrm.WriteBuffer(FBuffer, sizeof(FBuffer)); + FZRec.next_out := FBuffer; + FZRec.avail_out := sizeof(FBuffer); + end; + if FZRec.avail_out < sizeof(FBuffer) then + FStrm.WriteBuffer(FBuffer, sizeof(FBuffer) - FZRec.avail_out); + finally + deflateEnd(FZRec); + end; + inherited Destroy; +end; + +function TCompressionStream.Read(var Buffer; Count: Longint): Longint; +begin + raise ECompressionError.Create('Invalid stream operation'); +end; + +function TCompressionStream.Write(const Buffer; Count: Longint): Longint; +begin + FZRec.next_in := @Buffer; + FZRec.avail_in := Count; + if FStrm.Position <> FStrmPos then FStrm.Position := FStrmPos; + while (FZRec.avail_in > 0) do + begin + CCheck(deflate(FZRec, 0)); + if FZRec.avail_out = 0 then + begin + FStrm.WriteBuffer(FBuffer, sizeof(FBuffer)); + FZRec.next_out := FBuffer; + FZRec.avail_out := sizeof(FBuffer); + FStrmPos := FStrm.Position; + Progress(Self); + end; + end; + Result := Count; +end; + +function TCompressionStream.Seek(Offset: Longint; Origin: Word): Longint; +begin + if (Offset = 0) and (Origin = soFromCurrent) then + Result := FZRec.total_in + else + raise ECompressionError.Create('Invalid stream operation'); +end; + +function TCompressionStream.GetCompressionRate: Single; +begin + if FZRec.total_in = 0 then + Result := 0 + else + Result := (1.0 - (FZRec.total_out / FZRec.total_in)) * 100.0; +end; + + +// TDecompressionStream + +constructor TDecompressionStream.Create(Source: TStream); +begin + inherited Create(Source); + FZRec.next_in := FBuffer; + FZRec.avail_in := 0; + DCheck(inflateInit_(FZRec, zlib_version, sizeof(FZRec))); +end; + +destructor TDecompressionStream.Destroy; +begin + inflateEnd(FZRec); + inherited Destroy; +end; + +function TDecompressionStream.Read(var Buffer; Count: Longint): Longint; +begin + FZRec.next_out := @Buffer; + FZRec.avail_out := Count; + if FStrm.Position <> FStrmPos then FStrm.Position := FStrmPos; + while (FZRec.avail_out > 0) do + begin + if FZRec.avail_in = 0 then + begin + FZRec.avail_in := FStrm.Read(FBuffer, sizeof(FBuffer)); + if FZRec.avail_in = 0 then + begin + Result := Count - FZRec.avail_out; + Exit; + end; + FZRec.next_in := FBuffer; + FStrmPos := FStrm.Position; + Progress(Self); + end; + DCheck(inflate(FZRec, 0)); + end; + Result := Count; +end; + +function TDecompressionStream.Write(const Buffer; Count: Longint): Longint; +begin + raise EDecompressionError.Create('Invalid stream operation'); +end; + +function TDecompressionStream.Seek(Offset: Longint; Origin: Word): Longint; +var + I: Integer; + Buf: array [0..4095] of Char; +begin + if (Offset = 0) and (Origin = soFromBeginning) then + begin + DCheck(inflateReset(FZRec)); + FZRec.next_in := FBuffer; + FZRec.avail_in := 0; + FStrm.Position := 0; + FStrmPos := 0; + end + else if ( (Offset >= 0) and (Origin = soFromCurrent)) or + ( ((Offset - FZRec.total_out) > 0) and (Origin = soFromBeginning)) then + begin + if Origin = soFromBeginning then Dec(Offset, FZRec.total_out); + if Offset > 0 then + begin + for I := 1 to Offset div sizeof(Buf) do + ReadBuffer(Buf, sizeof(Buf)); + ReadBuffer(Buf, Offset mod sizeof(Buf)); + end; + end + else + raise EDecompressionError.Create('Invalid stream operation'); + Result := FZRec.total_out; +end; + +end. |