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ZLibEx.pas
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ZLibEx.pas
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{*************************************************************************************************
* ZLibEx.pas *
* *
* copyright (c) 2000-2013 base2 technologies *
* copyright (c) 1995-2002 Borland Software Corporation *
* *
* revision history *
* 2012.05.21 updated for win64 (delphi xe2) *
* added NativeInt type for delphi 2007- *
* added NativeUInt type for delphi 2007- *
* 2011.07.21 fixed routines to validate size before calling Move *
* 2010.07.01 hide overloaded Z*String* routines for delphi 5 *
* 2010.05.02 added ZDelfateEx and ZInflateEx *
* 2010.04.20 added TZ*Buffer classes *
* 2010.04.15 moved core zlib routines to separate unit (ZLibExApi.pas) *
* added ZDeflate* and ZInflate* *
* 2010.04.14 fixed ZInternalCompress loops *
* fixed ZInternalDecompress loops *
* updated ZInternalCompressStream loops *
* updated ZInternalDecompressStream loops *
* 2010.01.27 updated for delphi 2010 *
* 2009.04.14 added overloaded string routines for AnsiString and UnicodeString *
* 2009.01.28 updated for delphi 2009 String (UnicodeString) *
* 2008.05.15 added TStreamPos type for Stream.Position variants *
* added TCustomZStream.Stream* methods *
* 2007.08.17 modified TZCompressionStream.Write to use Write instead of WriteBuffer *
* 2007.03.15 moved gzip routines to separate unit (ZLibExGZ.pas) *
* 2006.10.07 fixed EZLibError constructor for c++ builder compatibility *
* 2006.03.28 moved Z_DEFLATED to interface section *
* added custom compression levels zcLevel1 thru zcLevel9 *
* 2006.03.27 added ZCompressStreamWeb *
* 2006.03.24 added ZAdler32 and ZCrc32 *
* 2005.11.29 changed FStreamPos to Int64 for delphi 6+ *
* 2005.03.04 modified ZInternalCompressStream loops *
* modified ZInternalDecompressStream loops *
* 2005.02.07 fixed ZInternalCompressStream loop conditions *
* fixed ZInternalDecompressStream loop conditions *
* 2005.01.11 added ZCompressStrWeb *
* 2003.04.14 added ZCompress2 and ZDecompress2 *
* added ZCompressStr2 and ZDecompressStr2 *
* added ZCompressStream2 and ZDecompressStream2 *
* added overloaded T*Stream constructors to support InflateInit2 *
* and DeflateInit2 *
* fixed ZDecompressStream to use ZDecompressCheck instead of ZCompressCheck *
* 2001.11.27 enhanced TZDecompressionStream.Read to adjust source stream position upon end *
* of compression data *
* fixed endless loop in TZDecompressionStream.Read when destination count was *
* greater than uncompressed data *
* 2001.10.26 renamed unit to integrate "nicely" with delphi 6 *
* 2000.11.24 added soFromEnd condition to TZDecompressionStream.Seek *
* added ZCompressStream and ZDecompressStream *
* 2000.06.13 optimized, fixed, rewrote, and enhanced the zlib.pas unit included on the *
* delphi cd (zlib version 1.1.3) *
* *
* acknowledgments *
* erik turner *
* 2001.10.26 Z*Stream routines *
* *
* david bennion *
* 2001.11.27 finding the nasty little endless loop quirk with the *
* TZDecompressionStream.Read method *
* *
* luigi sandon *
* 2005.02.07 pointing out the missing loop condition (Z_STREAM_END) in *
* ZInternalCompressStream and ZInternalDecompressStream *
* *
* ferry van genderen *
* 2005.03.04 assisting me fine tune and beta test ZInternalCompressStream and *
* ZInternalDecompressStream *
* *
* j. rathlev *
* 2005.11.28 pointing out the FStreamPos and TStream.Position type inconsistency *
* *
* anders johansen *
* 2006.10.07 pointing out the ELibError constructor incompatibility with c++ builder *
* *
* marcin szafranski *
* 2009.01.28 beta testing the delphi 2009 changes *
* *
* iztok kacin *
* 2009.04.14 assisting me design and further improve support for delphi 2009 *
* *
* oleg matrozov *
* 2010.04.14 pointing out the missing loop condition (avail_in > 0) in ZInternalCompress *
* and ZInternalDecompress *
* 2010.04.20 prototyping and assisting with the TZ*Buffer classes *
* *
* edward koo *
* 2010.07.01 pointing out the delphi 5 incompatibility with the overloaded Z*String* *
* routines *
* *
* egron elbra *
* 2011.07.20 pointing out the range exception when moving empty strings *
* *
* marian pascalau *
* 2012.05.21 providing their win64 modifications *
* *
* donations *
* 2011.05.06 farshad mohajeri *
* 2012.06.07 marat safin *
* 2012.12.14 moacir schmidt *
* 2013.05.23 roman ganz *
*************************************************************************************************}
unit ZLibEx;
interface
{$I ZLibEx.inc}
uses
SysUtils, Classes, ZLibExApi;
type
{$ifndef UNICODE}
RawByteString = AnsiString;
UnicodeString = WideString;
UnicodeChar = WideChar;
{$else ifdef Version2010Plus}
UnicodeChar = WideChar;
{$endif}
{$ifndef Version2009Plus}
NativeInt = Integer;
NativeUInt = Cardinal;
{$endif}
TStreamPos = {$ifdef Version6Plus} Int64 {$else} Longint {$endif};
TZCompressionLevel = (
zcNone,
zcFastest,
zcDefault,
zcMax,
zcLevel1,
zcLevel2,
zcLevel3,
zcLevel4,
zcLevel5,
zcLevel6,
zcLevel7,
zcLevel8,
zcLevel9
);
TZStrategy = (
zsDefault,
zsFiltered,
zsHuffman,
zsRLE,
zsFixed
);
TZError = (
zeError,
zeStreamError,
zeDataError,
zeMemoryError,
zeBufferError,
zeVersionError
);
TZFlush = (
zfNoFlush,
zfPartialFlush,
zfSyncFlush,
zfFullFlush,
zfFinish,
zfBlock,
zfTrees
);
const
ZLevels: Array [TZCompressionLevel] of Integer = (
Z_NO_COMPRESSION, // zcNone
Z_BEST_SPEED, // zcFastest
Z_DEFAULT_COMPRESSION, // zcDefault
Z_BEST_COMPRESSION, // zcMax
1, // zcLevel1
2, // zcLevel2
3, // zcLevel3
4, // zcLevel4
5, // zcLevel5
6, // zcLevel6
7, // zcLevel7
8, // zcLevel8
9 // zcLevel9
);
ZStrategies: Array [TZStrategy] of Integer = (
Z_DEFAULT_STRATEGY, // zsDefault
Z_FILTERED, // zsFiltered
Z_HUFFMAN_ONLY, // zsHuffman
Z_RLE, // zsRLE
Z_FIXED // zsFixed
);
ZErrors: Array [TZError] of Integer = (
Z_ERRNO, // zeError
Z_STREAM_ERROR, // zeStreamError
Z_DATA_ERROR, // zeDataError
Z_MEM_ERROR, // zeMemoryError
Z_BUF_ERROR, // zeBufferError
Z_VERSION_ERROR // zeVersionError
);
ZFlushes: Array [TZFlush] of Integer = (
Z_NO_FLUSH, // zfNoFlush
Z_PARTIAL_FLUSH, // zfPartialFlush
Z_SYNC_FLUSH, // zfSyncFlush
Z_FULL_FLUSH, // zfFullFlush
Z_FINISH, // zfFinish
Z_BLOCK, // zfBlock
Z_TREES // zfTrees
);
type
{** TZ*Function *******************************************************************************}
TZReadFunction = function (param: Pointer; var buffer;
size: Integer): Integer;
TZWriteFunction = function (param: Pointer; const buffer;
size: Integer): Integer;
{** TZInformation *****************************************************************************}
TZInformation = packed record
CompressedFlags : Longint;
CompressedSize : TStreamPos;
CompressedCrc : Longint;
CompressedAdler : Longint;
UncompressedFlags: Longint;
UncompressedSize : TStreamPos;
UncompressedCrc : Longint;
UncompressedAdler: Longint;
end;
{** TCustomZStream ****************************************************************************}
TCustomZStream = class(TStream)
private
FStream : TStream;
FStreamPos : TStreamPos;
FOnProgress: TNotifyEvent;
FZStream : TZStreamRec;
FBuffer : Array [Word] of Byte;
function GetStreamPosition: TStreamPos;
procedure SetStreamPosition(value: TStreamPos);
protected
constructor Create(stream: TStream);
function StreamRead(var buffer; count: Longint): Longint;
function StreamWrite(const buffer; count: Longint): Longint;
function StreamSeek(offset: Longint; origin: Word): Longint;
procedure StreamReadBuffer(var buffer; count: Longint);
procedure StreamWriteBuffer(const buffer; count: Longint);
procedure DoProgress; dynamic;
property StreamPosition: TStreamPos read GetStreamPosition write SetStreamPosition;
property OnProgress: TNotifyEvent read FOnProgress write FOnProgress;
end;
{** TZCompressionStream ***********************************************************************}
TZCompressionStream = class(TCustomZStream)
private
function GetCompressionRate: Single;
public
constructor Create(dest: TStream;
compressionLevel: TZCompressionLevel = zcDefault); overload;
constructor Create(dest: TStream; compressionLevel: TZCompressionLevel;
windowBits, memLevel: Integer; strategy: TZStrategy); overload;
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;
{** TZDecompressionStream *********************************************************************}
TZDecompressionStream = class(TCustomZStream)
public
constructor Create(source: TStream); overload;
constructor Create(source: TStream; windowBits: Integer); overload;
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;
{** TZCustomBuffer ****************************************************************************}
TZCustomBuffer = class(TObject)
private
FBuffer : Pointer;
FBufferCapacity: Integer;
FBufferSize : Integer;
protected
FZStream: TZStreamRec;
procedure BufferWrite(const buffer: Pointer; size: Integer);
procedure BufferRead(var buffer: Pointer; size: Integer);
procedure BufferCapacity(capacity: Integer);
property BufferSize: Integer read FBufferSize;
public
constructor Create;
destructor Destroy; override;
procedure Clear; virtual;
procedure Flush(flush: TZFlush); virtual;
function Write(const buffer: Pointer; size: Integer): Integer; overload;
virtual; abstract;
function Write(const s: AnsiString): Integer; overload;
function Read(var buffer: Pointer; size: Integer): Integer; overload;
function Read(var s: AnsiString): Integer; overload;
end;
{** TZCompressionBuffer ***********************************************************************}
TZCompressionBuffer = class(TZCustomBuffer)
public
constructor Create(level: TZCompressionLevel = zcDefault); overload;
constructor Create(level: TZCompressionLevel;
windowBits, memLevel: Integer; strategy: TZStrategy); overload;
destructor Destroy; override;
procedure Clear; override;
procedure Flush(flush: TZFlush); override;
function Write(const buffer: Pointer; size: Integer): Integer;
override;
end;
{** TZDecompressionBuffer *********************************************************************}
TZDecompressionBuffer = class(TZCustomBuffer)
public
constructor Create; overload;
constructor Create(windowBits: Integer); overload;
destructor Destroy; override;
procedure Clear; override;
function Write(const buffer: Pointer; size: Integer): Integer; override;
end;
{** zlib deflate routines ***********************************************************************}
function ZDeflateInit(var stream: TZStreamRec;
level: TZCompressionLevel): Integer;
{$ifdef Version2005Plus} inline; {$endif}
function ZDeflateInit2(var stream: TZStreamRec;
level: TZCompressionLevel; windowBits, memLevel: Integer;
strategy: TZStrategy): Integer;
{$ifdef Version2005Plus} inline; {$endif}
function ZDeflate(var stream: TZStreamRec; flush: TZFlush): Integer;
{$ifdef Version2005Plus} inline; {$endif}
function ZDeflateEnd(var stream: TZStreamRec): Integer;
{$ifdef Version2005Plus} inline; {$endif}
function ZDeflateReset(var stream: TZStreamRec): Integer;
{$ifdef Version2005Plus} inline; {$endif}
{** zlib inflate routines ***********************************************************************}
function ZInflateInit(var stream: TZStreamRec): Integer;
{$ifdef Version2005Plus} inline; {$endif}
function ZInflateInit2(var stream: TZStreamRec;
windowBits: Integer): Integer;
{$ifdef Version2005Plus} inline; {$endif}
function ZInflate(var stream: TZStreamRec; flush: TZFlush): Integer;
{$ifdef Version2005Plus} inline; {$endif}
function ZInflateEnd(var stream: TZStreamRec): Integer;
{$ifdef Version2005Plus} inline; {$endif}
function ZInflateReset(var stream: TZStreamRec): Integer;
{$ifdef Version2005Plus} inline; {$endif}
{** zlib checksum routines **********************************************************************}
function ZAdler32(adler: Longint; const buffer; size: Integer): Longint;
{$ifdef Version2005Plus} inline; {$endif}
function ZCrc32(crc: Longint; const buffer; size: Integer): Longint;
{$ifdef Version2005Plus} inline; {$endif}
{** zlib custom routines ************************************************************************}
procedure ZDeflateEx(var stream: TZStreamRec; param: Pointer;
read: TZReadFunction; write: TZWriteFunction; flush: TZFlush);
procedure ZInflateEx(var stream: TZStreamRec; param: Pointer;
read: TZReadFunction; write: TZWriteFunction; flush: TZFlush);
{*************************************************************************************************
* ZCompress *
* *
* pre-conditions *
* inBuffer = pointer to uncompressed data *
* inSize = size of inBuffer (bytes) *
* outBuffer = pointer (unallocated) *
* level = compression level *
* *
* post-conditions *
* outBuffer = pointer to compressed data (allocated) *
* outSize = size of outBuffer (bytes) *
*************************************************************************************************}
procedure ZCompress(const inBuffer: Pointer; inSize: Integer;
out outBuffer: Pointer; out outSize: Integer;
level: TZCompressionLevel = zcDefault);
{*************************************************************************************************
* ZCompress2 *
* *
* pre-conditions *
* inBuffer = pointer to uncompressed data *
* inSize = size of inBuffer (bytes) *
* outBuffer = pointer (unallocated) *
* level = compression level *
* method = compression method *
* windowBits = window bits *
* memLevel = memory level *
* strategy = compression strategy *
* *
* post-conditions *
* outBuffer = pointer to compressed data (allocated) *
* outSize = size of outBuffer (bytes) *
*************************************************************************************************}
procedure ZCompress2(const inBuffer: Pointer; inSize: Integer;
out outBuffer: Pointer; out outSize: Integer; level: TZCompressionLevel;
windowBits, memLevel: Integer; strategy: TZStrategy);
{*************************************************************************************************
* ZDecompress *
* *
* pre-conditions *
* inBuffer = pointer to compressed data *
* inSize = size of inBuffer (bytes) *
* outBuffer = pointer (unallocated) *
* outEstimate = estimated size of uncompressed data (bytes) *
* *
* post-conditions *
* outBuffer = pointer to decompressed data (allocated) *
* outSize = size of outBuffer (bytes) *
*************************************************************************************************}
procedure ZDecompress(const inBuffer: Pointer; inSize: Integer;
out outBuffer: Pointer; out outSize: Integer; outEstimate: Integer = 0);
{*************************************************************************************************
* ZDecompress2 *
* *
* pre-conditions *
* inBuffer = pointer to compressed data *
* inSize = size of inBuffer (bytes) *
* outBuffer = pointer (unallocated) *
* windowBits = window bits *
* outEstimate = estimated size of uncompressed data (bytes) *
* *
* post-conditions *
* outBuffer = pointer to decompressed data (allocated) *
* outSize = size of outBuffer (bytes) *
*************************************************************************************************}
procedure ZDecompress2(const inBuffer: Pointer; inSize: Integer;
out outBuffer: Pointer; out outSize: Integer; windowBits: Integer;
outEstimate: Integer = 0);
{** string routines *****************************************************************************}
{*************************************************************************************************
* ZCompressStr *
* *
* pre-conditions *
* s = uncompressed data string *
* level = compression level *
* *
* return *
* compressed data string *
*************************************************************************************************}
function ZCompressStr(const s: AnsiString;
level: TZCompressionLevel = zcDefault): RawByteString;
procedure ZCompressString(var result: RawByteString; const s: AnsiString;
level: TZCompressionLevel = zcDefault); overload;
{$ifdef Version6Plus}
procedure ZCompressString(var result: RawByteString; const s: UnicodeString;
level: TZCompressionLevel = zcDefault); overload;
{$endif}
{*************************************************************************************************
* ZCompressStrEx *
* *
* pre-conditions *
* s = uncompressed data string *
* level = compression level *
* *
* return *
* compressed data string with 4 byte (integer) header indicating *
* original uncompressed data length *
*************************************************************************************************}
function ZCompressStrEx(const s: AnsiString;
level: TZCompressionLevel = zcDefault): RawByteString;
procedure ZCompressStringEx(var result: RawByteString; const s: AnsiString;
level: TZCompressionLevel = zcDefault); overload;
{$ifdef Version6Plus}
procedure ZCompressStringEx(var result: RawByteString; const s: UnicodeString;
level: TZCompressionLevel = zcDefault); overload;
{$endif}
{*************************************************************************************************
* ZCompressStr2 *
* *
* pre-conditions *
* s = uncompressed data string *
* level = compression level *
* windowBits = window bits *
* memLevel = memory level *
* strategy = compression strategy *
* *
* return *
* compressed data string *
*************************************************************************************************}
function ZCompressStr2(const s: AnsiString; level: TZCompressionLevel;
windowBits, memLevel: Integer; strategy: TZStrategy): RawByteString;
procedure ZCompressString2(var result: RawByteString; const s: AnsiString;
level: TZCompressionLevel; windowBits, memLevel: Integer;
strategy: TZStrategy); overload;
{$ifdef Version6Plus}
procedure ZCompressString2(var result: RawByteString; const s: UnicodeString;
level: TZCompressionLevel; windowBits, memLevel: Integer;
strategy: TZStrategy); overload;
{$endif}
{*************************************************************************************************
* ZCompressStrWeb *
* *
* pre-conditions *
* s = uncompressed data string *
* *
* return *
* compressed data string *
*************************************************************************************************}
function ZCompressStrWeb(const s: AnsiString): RawByteString;
procedure ZCompressStringWeb(var result: RawByteString; const s: AnsiString);
overload;
{$ifdef Version6Plus}
procedure ZCompressStringWeb(var result: RawByteString;
const s: UnicodeString); overload;
{$endif}
{*************************************************************************************************
* ZDecompressStr *
* *
* pre-conditions *
* s = compressed data string *
* *
* return *
* uncompressed data string *
*************************************************************************************************}
function ZDecompressStr(const s: RawByteString): AnsiString;
procedure ZDecompressString(var result: AnsiString; const s: RawByteString);
overload;
{$ifdef Version6Plus}
procedure ZDecompressString(var result: UnicodeString;
const s: RawByteString); overload;
{$endif}
{*************************************************************************************************
* ZDecompressStrEx *
* *
* pre-conditions *
* s = compressed data string with 4 byte (integer) header indicating *
* original uncompressed data length *
* *
* return *
* uncompressed data string *
*************************************************************************************************}
function ZDecompressStrEx(const s: RawByteString): AnsiString;
procedure ZDecompressStringEx(var result: AnsiString; const s: RawByteString);
overload;
{$ifdef Version6Plus}
procedure ZDecompressStringEx(var result: UnicodeString;
const s: RawByteString); overload;
{$endif}
{*************************************************************************************************
* ZDecompressStr2 *
* *
* pre-conditions *
* s = compressed data string *
* windowBits = window bits *
* *
* return *
* uncompressed data string *
*************************************************************************************************}
function ZDecompressStr2(const s: RawByteString;
windowBits: Integer): AnsiString;
procedure ZDecompressString2(var result: AnsiString; const s: RawByteString;
windowBits: Integer); overload;
{$ifdef Version6Plus}
procedure ZDecompressString2(var result: UnicodeString;
const s: RawByteString; windowBits: Integer); overload;
{$endif}
{** stream routines *****************************************************************************}
procedure ZCompressStream(inStream, outStream: TStream;
level: TZCompressionLevel = zcDefault);
procedure ZCompressStream2(inStream, outStream: TStream;
level: TZCompressionLevel; windowBits, memLevel: Integer;
strategy: TZStrategy);
procedure ZCompressStreamWeb(inStream, outStream: TStream);
procedure ZDecompressStream(inStream, outStream: TStream);
procedure ZDecompressStream2(inStream, outStream: TStream;
windowBits: Integer);
{************************************************************************************************}
type
EZLibErrorClass = class of EZlibError;
EZLibError = class(Exception)
private
FErrorCode: Integer;
public
constructor Create(code: Integer; const dummy: String = ''); overload;
constructor Create(error: TZError; const dummy: String = ''); overload;
property ErrorCode: Integer read FErrorCode write FErrorCode;
end;
EZCompressionError = class(EZLibError);
EZDecompressionError = class(EZLibError);
implementation
const
SZInvalid = 'Invalid ZStream operation!';
{************************************************************************************************}
function ZCompressCheck(code: Integer): Integer;
begin
result := code;
if code < 0 then
begin
raise EZCompressionError.Create(code);
end;
end;
function ZDecompressCheck(code: Integer; raiseBufferError: Boolean = True): Integer;
begin
Result := code;
if code < 0 then
begin
if (code <> Z_BUF_ERROR) or raiseBufferError then
begin
raise EZDecompressionError.Create(code);
end;
end;
end;
{** zlib deflate routines ***********************************************************************}
function ZDeflateInit(var stream: TZStreamRec;
level: TZCompressionLevel): Integer;
begin
result := deflateInit_(stream, ZLevels[level], ZLIB_VERSION,
SizeOf(TZStreamRec));
end;
function ZDeflateInit2(var stream: TZStreamRec;
level: TZCompressionLevel; windowBits, memLevel: Integer;
strategy: TZStrategy): Integer;
begin
result := deflateInit2_(stream, ZLevels[level], Z_DEFLATED, windowBits,
memLevel, ZStrategies[strategy], ZLIB_VERSION, SizeOf(TZStreamRec));
end;
function ZDeflate(var stream: TZStreamRec; flush: TZFlush): Integer;
begin
result := deflate(stream, ZFlushes[flush]);
end;
function ZDeflateEnd(var stream: TZStreamRec): Integer;
begin
result := deflateEnd(stream);
end;
function ZDeflateReset(var stream: TZStreamRec): Integer;
begin
result := deflateReset(stream);
end;
{** zlib inflate routines ***********************************************************************}
function ZInflateInit(var stream: TZStreamRec): Integer;
begin
result := inflateInit_(stream, ZLIB_VERSION, SizeOf(TZStreamRec));
end;
function ZInflateInit2(var stream: TZStreamRec;
windowBits: Integer): Integer;
begin
result := inflateInit2_(stream, windowBits, ZLIB_VERSION,
SizeOf(TZStreamRec));
end;
function ZInflate(var stream: TZStreamRec; flush: TZFlush): Integer;
begin
result := inflate(stream, ZFlushes[flush]);
end;
function ZInflateEnd(var stream: TZStreamRec): Integer;
begin
result := inflateEnd(stream);
end;
function ZInflateReset(var stream: TZStreamRec): Integer;
begin
result := inflateReset(stream);
end;
{** zlib checksum routines **********************************************************************}
function ZAdler32(adler: Longint; const buffer; size: Integer): Longint;
begin
result := adler32(adler,buffer,size);
end;
function ZCrc32(crc: Longint; const buffer; size: Integer): Longint;
begin
result := crc32(crc,buffer,size);
end;
{** zlib extended routines **********************************************************************}
procedure ZDeflateEx(var stream: TZStreamRec; param: Pointer;
read: TZReadFunction; write: TZWriteFunction; flush: TZFlush);
const
bufferSize = 8192;
var
zresult : Integer;
readBuffer : Array [0..bufferSize - 1] of Byte;
writeBuffer: Array [0..bufferSize - 1] of Byte;
writeSize : Integer;
flushEx : TZFlush;
begin
if Assigned(read) then
begin
stream.avail_in := read(param, readBuffer, bufferSize);
end
else stream.avail_in := 0;
repeat
stream.next_in := @readBuffer;
repeat
stream.avail_out := bufferSize;
stream.next_out := @writeBuffer;
flushEx := flush;
if (flushEx = zfFinish) and (stream.avail_in = bufferSize) then
begin
flushEx := zfNoFlush;
end;
zresult := ZCompressCheck(ZDeflate(stream, flushEx));
writeSize := bufferSize - stream.avail_out;
write(param, writeBuffer, writeSize);
until stream.avail_out > 0;
//assert: stream.avail_in = 0
if (zresult <> Z_STREAM_END) and Assigned(read) then
begin
stream.avail_in := read(param, readBuffer, bufferSize);
end;
until (stream.avail_in = 0) and (flush = flushEx);
end;
procedure ZInflateEx(var stream: TZStreamRec; param: Pointer;
read: TZReadFunction; write: TZWriteFunction; flush: TZFlush);
const
bufferSize = 8192;
var
zresult : Integer;
readBuffer : Array [0..bufferSize - 1] of Byte;
writeBuffer: Array [0..bufferSize - 1] of Byte;
writeSize : Integer;
begin
if Assigned(read) then
begin
stream.avail_in := read(param, readBuffer, bufferSize);
end
else stream.avail_in := 0;
zresult := Z_OK;
while (zresult <> Z_STREAM_END) and (stream.avail_in > 0) do
begin
stream.next_in := @readBuffer;
repeat
stream.avail_out := bufferSize;
stream.next_out := @writeBuffer;
zresult := ZDecompressCheck(ZInflate(stream, flush), False);
writeSize := bufferSize - stream.avail_out;
write(param, writeBuffer, writeSize);
until stream.avail_out > 0;
if (zresult <> Z_STREAM_END) and Assigned(read) then
begin
stream.avail_in := read(param, readBuffer, bufferSize);
end;
end;
end;
{** private buffer routines *********************************************************************}
type
PZBufferParam = ^TZBufferParam;
TZBufferParam = packed record
InBuffer : Pointer;
InPosition : Integer;
InSize : Integer;
OutBuffer : Pointer;
OutPosition: Integer;
OutSize : Integer;
end;
function ZBufferRead(p: Pointer; var buffer; size: Integer): Integer;
var
param: PZBufferParam;
begin
param := PZBufferParam(p);
result := param^.InSize - param^.InPosition;
if result > size then result := size;
Move(Pointer(Integer(param^.InBuffer) + param^.InPosition)^, buffer, result);
Inc(param^.InPosition, result);
end;
function ZBufferWrite(p: Pointer; const buffer; size: Integer): Integer;
var
param: PZBufferParam;
begin
param := PZBufferParam(p);
if param^.OutPosition + size > param^.OutSize then
begin
param^.OutSize := param^.OutPosition + size;
ReallocMem(Pointer(param^.OutBuffer), param^.OutSize);
end;
Move(buffer, Pointer(Integer(param^.OutBuffer) + param^.OutPosition)^, size);
Inc(param^.OutPosition, size);
result := size;
end;
procedure ZInternalCompressEx(var zstream: TZStreamRec; const inBuffer: Pointer;
inSize: Integer; out outBuffer: Pointer; out outSize: Integer);
var
param: TZBufferParam;
begin
FillChar(param, SizeOf(TZBufferParam), 0);
outBuffer := Nil;
outSize := 0;
param.InBuffer := inBuffer;
param.InSize := inSize;
try
ZDeflateEx(zstream, @param, @ZBufferRead, @ZBufferWrite, zfFinish);
ZCompressCheck(ZDeflateEnd(zstream));
outBuffer := param.OutBuffer;
outSize := param.OutSize;
except
FreeMem(param.OutBuffer);
raise;
end;
end;
procedure ZInternalDecompressEx(zstream: TZStreamRec; const inBuffer: Pointer;
inSize: Integer; out outBuffer: Pointer; out outSize: Integer;
outEstimate: Integer);
var
param: TZBufferParam;
begin
FillChar(param, SizeOf(TZBufferParam), 0);
outBuffer := Nil;
outSize := 0;
param.InBuffer := inBuffer;
param.InSize := inSize;
if outEstimate > 0 then
begin
GetMem(param.OutBuffer, outEstimate);
param.OutSize := outEstimate;
end;
try
ZInflateEx(zstream, @param, @ZBufferRead, @ZBufferWrite, zfNoFlush);
ZDecompressCheck(ZInflateEnd(zstream));
outBuffer := param.OutBuffer;
outSize := param.OutSize;
except
FreeMem(param.OutBuffer);
raise;
end;