| 1 |
(* example.c -- usage example of the zlib compression library |
| 2 |
* Copyright (C) 1995-2003 Jean-loup Gailly. |
| 3 |
* For conditions of distribution and use, see copyright notice in zlib.h |
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* |
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* Pascal translation |
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* Copyright (C) 1998 by Jacques Nomssi Nzali. |
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* For conditions of distribution and use, see copyright notice in readme.txt |
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* |
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* Adaptation to the zlibpas interface |
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* Copyright (C) 2003 by Cosmin Truta. |
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* For conditions of distribution and use, see copyright notice in readme.txt |
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*) |
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|
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program example; |
| 15 |
|
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{$DEFINE TEST_COMPRESS} |
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{DO NOT $DEFINE TEST_GZIO} |
| 18 |
{$DEFINE TEST_DEFLATE} |
| 19 |
{$DEFINE TEST_INFLATE} |
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{$DEFINE TEST_FLUSH} |
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{$DEFINE TEST_SYNC} |
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{$DEFINE TEST_DICT} |
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|
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uses SysUtils, zlibpas; |
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|
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const TESTFILE = 'foo.gz'; |
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|
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(* "hello world" would be more standard, but the repeated "hello" |
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* stresses the compression code better, sorry... |
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*) |
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const hello: PChar = 'hello, hello!'; |
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|
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const dictionary: PChar = 'hello'; |
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|
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var dictId: LongInt; (* Adler32 value of the dictionary *) |
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|
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procedure CHECK_ERR(err: Integer; msg: String); |
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begin |
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if err <> Z_OK then |
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begin |
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WriteLn(msg, ' error: ', err); |
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Halt(1); |
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end; |
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end; |
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|
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procedure EXIT_ERR(const msg: String); |
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begin |
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WriteLn('Error: ', msg); |
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Halt(1); |
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end; |
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|
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(* =========================================================================== |
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* Test compress and uncompress |
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*) |
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{$IFDEF TEST_COMPRESS} |
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procedure test_compress(compr: Pointer; comprLen: LongInt; |
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uncompr: Pointer; uncomprLen: LongInt); |
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var err: Integer; |
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len: LongInt; |
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begin |
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len := StrLen(hello)+1; |
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|
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err := compress(compr, comprLen, hello, len); |
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CHECK_ERR(err, 'compress'); |
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|
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StrCopy(PChar(uncompr), 'garbage'); |
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|
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err := uncompress(uncompr, uncomprLen, compr, comprLen); |
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CHECK_ERR(err, 'uncompress'); |
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|
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if StrComp(PChar(uncompr), hello) <> 0 then |
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EXIT_ERR('bad uncompress') |
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else |
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WriteLn('uncompress(): ', PChar(uncompr)); |
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end; |
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{$ENDIF} |
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|
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(* =========================================================================== |
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* Test read/write of .gz files |
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*) |
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{$IFDEF TEST_GZIO} |
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procedure test_gzio(const fname: PChar; (* compressed file name *) |
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uncompr: Pointer; |
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uncomprLen: LongInt); |
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var err: Integer; |
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len: Integer; |
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zfile: gzFile; |
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pos: LongInt; |
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begin |
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len := StrLen(hello)+1; |
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|
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zfile := gzopen(fname, 'wb'); |
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if zfile = NIL then |
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begin |
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WriteLn('gzopen error'); |
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Halt(1); |
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end; |
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gzputc(zfile, 'h'); |
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if gzputs(zfile, 'ello') <> 4 then |
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begin |
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WriteLn('gzputs err: ', gzerror(zfile, err)); |
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Halt(1); |
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end; |
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{$IFDEF GZ_FORMAT_STRING} |
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if gzprintf(zfile, ', %s!', 'hello') <> 8 then |
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begin |
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WriteLn('gzprintf err: ', gzerror(zfile, err)); |
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Halt(1); |
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end; |
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{$ELSE} |
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if gzputs(zfile, ', hello!') <> 8 then |
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begin |
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WriteLn('gzputs err: ', gzerror(zfile, err)); |
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Halt(1); |
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end; |
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{$ENDIF} |
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gzseek(zfile, 1, SEEK_CUR); (* add one zero byte *) |
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gzclose(zfile); |
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|
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zfile := gzopen(fname, 'rb'); |
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if zfile = NIL then |
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begin |
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WriteLn('gzopen error'); |
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Halt(1); |
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end; |
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|
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StrCopy(PChar(uncompr), 'garbage'); |
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|
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if gzread(zfile, uncompr, uncomprLen) <> len then |
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begin |
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WriteLn('gzread err: ', gzerror(zfile, err)); |
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Halt(1); |
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end; |
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if StrComp(PChar(uncompr), hello) <> 0 then |
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begin |
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WriteLn('bad gzread: ', PChar(uncompr)); |
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Halt(1); |
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end |
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else |
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WriteLn('gzread(): ', PChar(uncompr)); |
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|
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pos := gzseek(zfile, -8, SEEK_CUR); |
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if (pos <> 6) or (gztell(zfile) <> pos) then |
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begin |
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WriteLn('gzseek error, pos=', pos, ', gztell=', gztell(zfile)); |
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Halt(1); |
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end; |
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|
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if gzgetc(zfile) <> ' ' then |
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begin |
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WriteLn('gzgetc error'); |
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Halt(1); |
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end; |
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|
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if gzungetc(' ', zfile) <> ' ' then |
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begin |
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WriteLn('gzungetc error'); |
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Halt(1); |
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end; |
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|
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gzgets(zfile, PChar(uncompr), uncomprLen); |
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uncomprLen := StrLen(PChar(uncompr)); |
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if uncomprLen <> 7 then (* " hello!" *) |
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begin |
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WriteLn('gzgets err after gzseek: ', gzerror(zfile, err)); |
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Halt(1); |
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end; |
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if StrComp(PChar(uncompr), hello + 6) <> 0 then |
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begin |
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WriteLn('bad gzgets after gzseek'); |
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Halt(1); |
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end |
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else |
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WriteLn('gzgets() after gzseek: ', PChar(uncompr)); |
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|
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gzclose(zfile); |
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end; |
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{$ENDIF} |
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|
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(* =========================================================================== |
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* Test deflate with small buffers |
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*) |
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{$IFDEF TEST_DEFLATE} |
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procedure test_deflate(compr: Pointer; comprLen: LongInt); |
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var c_stream: z_stream; (* compression stream *) |
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err: Integer; |
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len: LongInt; |
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begin |
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len := StrLen(hello)+1; |
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|
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c_stream.zalloc := NIL; |
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c_stream.zfree := NIL; |
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c_stream.opaque := NIL; |
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|
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err := deflateInit(c_stream, Z_DEFAULT_COMPRESSION); |
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CHECK_ERR(err, 'deflateInit'); |
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|
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c_stream.next_in := hello; |
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c_stream.next_out := compr; |
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|
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while (c_stream.total_in <> len) and |
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(c_stream.total_out < comprLen) do |
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begin |
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c_stream.avail_out := 1; { force small buffers } |
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c_stream.avail_in := 1; |
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err := deflate(c_stream, Z_NO_FLUSH); |
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CHECK_ERR(err, 'deflate'); |
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end; |
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|
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(* Finish the stream, still forcing small buffers: *) |
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while TRUE do |
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begin |
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c_stream.avail_out := 1; |
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err := deflate(c_stream, Z_FINISH); |
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if err = Z_STREAM_END then |
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break; |
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CHECK_ERR(err, 'deflate'); |
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end; |
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|
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err := deflateEnd(c_stream); |
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CHECK_ERR(err, 'deflateEnd'); |
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end; |
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{$ENDIF} |
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|
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(* =========================================================================== |
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* Test inflate with small buffers |
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*) |
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{$IFDEF TEST_INFLATE} |
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procedure test_inflate(compr: Pointer; comprLen : LongInt; |
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uncompr: Pointer; uncomprLen : LongInt); |
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var err: Integer; |
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d_stream: z_stream; (* decompression stream *) |
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begin |
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StrCopy(PChar(uncompr), 'garbage'); |
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|
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d_stream.zalloc := NIL; |
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d_stream.zfree := NIL; |
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d_stream.opaque := NIL; |
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|
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d_stream.next_in := compr; |
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d_stream.avail_in := 0; |
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d_stream.next_out := uncompr; |
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|
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err := inflateInit(d_stream); |
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CHECK_ERR(err, 'inflateInit'); |
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|
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while (d_stream.total_out < uncomprLen) and |
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(d_stream.total_in < comprLen) do |
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begin |
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d_stream.avail_out := 1; (* force small buffers *) |
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d_stream.avail_in := 1; |
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err := inflate(d_stream, Z_NO_FLUSH); |
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if err = Z_STREAM_END then |
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break; |
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CHECK_ERR(err, 'inflate'); |
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end; |
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|
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err := inflateEnd(d_stream); |
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CHECK_ERR(err, 'inflateEnd'); |
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|
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if StrComp(PChar(uncompr), hello) <> 0 then |
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EXIT_ERR('bad inflate') |
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else |
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WriteLn('inflate(): ', PChar(uncompr)); |
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end; |
| 266 |
{$ENDIF} |
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|
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(* =========================================================================== |
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* Test deflate with large buffers and dynamic change of compression level |
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*) |
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{$IFDEF TEST_DEFLATE} |
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procedure test_large_deflate(compr: Pointer; comprLen: LongInt; |
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uncompr: Pointer; uncomprLen: LongInt); |
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var c_stream: z_stream; (* compression stream *) |
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err: Integer; |
| 276 |
begin |
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c_stream.zalloc := NIL; |
| 278 |
c_stream.zfree := NIL; |
| 279 |
c_stream.opaque := NIL; |
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|
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err := deflateInit(c_stream, Z_BEST_SPEED); |
| 282 |
CHECK_ERR(err, 'deflateInit'); |
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|
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c_stream.next_out := compr; |
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c_stream.avail_out := Integer(comprLen); |
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|
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(* At this point, uncompr is still mostly zeroes, so it should compress |
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* very well: |
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*) |
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c_stream.next_in := uncompr; |
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c_stream.avail_in := Integer(uncomprLen); |
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err := deflate(c_stream, Z_NO_FLUSH); |
| 293 |
CHECK_ERR(err, 'deflate'); |
| 294 |
if c_stream.avail_in <> 0 then |
| 295 |
EXIT_ERR('deflate not greedy'); |
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|
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(* Feed in already compressed data and switch to no compression: *) |
| 298 |
deflateParams(c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY); |
| 299 |
c_stream.next_in := compr; |
| 300 |
c_stream.avail_in := Integer(comprLen div 2); |
| 301 |
err := deflate(c_stream, Z_NO_FLUSH); |
| 302 |
CHECK_ERR(err, 'deflate'); |
| 303 |
|
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(* Switch back to compressing mode: *) |
| 305 |
deflateParams(c_stream, Z_BEST_COMPRESSION, Z_FILTERED); |
| 306 |
c_stream.next_in := uncompr; |
| 307 |
c_stream.avail_in := Integer(uncomprLen); |
| 308 |
err := deflate(c_stream, Z_NO_FLUSH); |
| 309 |
CHECK_ERR(err, 'deflate'); |
| 310 |
|
| 311 |
err := deflate(c_stream, Z_FINISH); |
| 312 |
if err <> Z_STREAM_END then |
| 313 |
EXIT_ERR('deflate should report Z_STREAM_END'); |
| 314 |
|
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err := deflateEnd(c_stream); |
| 316 |
CHECK_ERR(err, 'deflateEnd'); |
| 317 |
end; |
| 318 |
{$ENDIF} |
| 319 |
|
| 320 |
(* =========================================================================== |
| 321 |
* Test inflate with large buffers |
| 322 |
*) |
| 323 |
{$IFDEF TEST_INFLATE} |
| 324 |
procedure test_large_inflate(compr: Pointer; comprLen: LongInt; |
| 325 |
uncompr: Pointer; uncomprLen: LongInt); |
| 326 |
var err: Integer; |
| 327 |
d_stream: z_stream; (* decompression stream *) |
| 328 |
begin |
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StrCopy(PChar(uncompr), 'garbage'); |
| 330 |
|
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d_stream.zalloc := NIL; |
| 332 |
d_stream.zfree := NIL; |
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d_stream.opaque := NIL; |
| 334 |
|
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d_stream.next_in := compr; |
| 336 |
d_stream.avail_in := Integer(comprLen); |
| 337 |
|
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err := inflateInit(d_stream); |
| 339 |
CHECK_ERR(err, 'inflateInit'); |
| 340 |
|
| 341 |
while TRUE do |
| 342 |
begin |
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d_stream.next_out := uncompr; (* discard the output *) |
| 344 |
d_stream.avail_out := Integer(uncomprLen); |
| 345 |
err := inflate(d_stream, Z_NO_FLUSH); |
| 346 |
if err = Z_STREAM_END then |
| 347 |
break; |
| 348 |
CHECK_ERR(err, 'large inflate'); |
| 349 |
end; |
| 350 |
|
| 351 |
err := inflateEnd(d_stream); |
| 352 |
CHECK_ERR(err, 'inflateEnd'); |
| 353 |
|
| 354 |
if d_stream.total_out <> 2 * uncomprLen + comprLen div 2 then |
| 355 |
begin |
| 356 |
WriteLn('bad large inflate: ', d_stream.total_out); |
| 357 |
Halt(1); |
| 358 |
end |
| 359 |
else |
| 360 |
WriteLn('large_inflate(): OK'); |
| 361 |
end; |
| 362 |
{$ENDIF} |
| 363 |
|
| 364 |
(* =========================================================================== |
| 365 |
* Test deflate with full flush |
| 366 |
*) |
| 367 |
{$IFDEF TEST_FLUSH} |
| 368 |
procedure test_flush(compr: Pointer; var comprLen : LongInt); |
| 369 |
var c_stream: z_stream; (* compression stream *) |
| 370 |
err: Integer; |
| 371 |
len: Integer; |
| 372 |
begin |
| 373 |
len := StrLen(hello)+1; |
| 374 |
|
| 375 |
c_stream.zalloc := NIL; |
| 376 |
c_stream.zfree := NIL; |
| 377 |
c_stream.opaque := NIL; |
| 378 |
|
| 379 |
err := deflateInit(c_stream, Z_DEFAULT_COMPRESSION); |
| 380 |
CHECK_ERR(err, 'deflateInit'); |
| 381 |
|
| 382 |
c_stream.next_in := hello; |
| 383 |
c_stream.next_out := compr; |
| 384 |
c_stream.avail_in := 3; |
| 385 |
c_stream.avail_out := Integer(comprLen); |
| 386 |
err := deflate(c_stream, Z_FULL_FLUSH); |
| 387 |
CHECK_ERR(err, 'deflate'); |
| 388 |
|
| 389 |
Inc(PByteArray(compr)^[3]); (* force an error in first compressed block *) |
| 390 |
c_stream.avail_in := len - 3; |
| 391 |
|
| 392 |
err := deflate(c_stream, Z_FINISH); |
| 393 |
if err <> Z_STREAM_END then |
| 394 |
CHECK_ERR(err, 'deflate'); |
| 395 |
|
| 396 |
err := deflateEnd(c_stream); |
| 397 |
CHECK_ERR(err, 'deflateEnd'); |
| 398 |
|
| 399 |
comprLen := c_stream.total_out; |
| 400 |
end; |
| 401 |
{$ENDIF} |
| 402 |
|
| 403 |
(* =========================================================================== |
| 404 |
* Test inflateSync() |
| 405 |
*) |
| 406 |
{$IFDEF TEST_SYNC} |
| 407 |
procedure test_sync(compr: Pointer; comprLen: LongInt; |
| 408 |
uncompr: Pointer; uncomprLen : LongInt); |
| 409 |
var err: Integer; |
| 410 |
d_stream: z_stream; (* decompression stream *) |
| 411 |
begin |
| 412 |
StrCopy(PChar(uncompr), 'garbage'); |
| 413 |
|
| 414 |
d_stream.zalloc := NIL; |
| 415 |
d_stream.zfree := NIL; |
| 416 |
d_stream.opaque := NIL; |
| 417 |
|
| 418 |
d_stream.next_in := compr; |
| 419 |
d_stream.avail_in := 2; (* just read the zlib header *) |
| 420 |
|
| 421 |
err := inflateInit(d_stream); |
| 422 |
CHECK_ERR(err, 'inflateInit'); |
| 423 |
|
| 424 |
d_stream.next_out := uncompr; |
| 425 |
d_stream.avail_out := Integer(uncomprLen); |
| 426 |
|
| 427 |
inflate(d_stream, Z_NO_FLUSH); |
| 428 |
CHECK_ERR(err, 'inflate'); |
| 429 |
|
| 430 |
d_stream.avail_in := Integer(comprLen-2); (* read all compressed data *) |
| 431 |
err := inflateSync(d_stream); (* but skip the damaged part *) |
| 432 |
CHECK_ERR(err, 'inflateSync'); |
| 433 |
|
| 434 |
err := inflate(d_stream, Z_FINISH); |
| 435 |
if err <> Z_DATA_ERROR then |
| 436 |
EXIT_ERR('inflate should report DATA_ERROR'); |
| 437 |
(* Because of incorrect adler32 *) |
| 438 |
|
| 439 |
err := inflateEnd(d_stream); |
| 440 |
CHECK_ERR(err, 'inflateEnd'); |
| 441 |
|
| 442 |
WriteLn('after inflateSync(): hel', PChar(uncompr)); |
| 443 |
end; |
| 444 |
{$ENDIF} |
| 445 |
|
| 446 |
(* =========================================================================== |
| 447 |
* Test deflate with preset dictionary |
| 448 |
*) |
| 449 |
{$IFDEF TEST_DICT} |
| 450 |
procedure test_dict_deflate(compr: Pointer; comprLen: LongInt); |
| 451 |
var c_stream: z_stream; (* compression stream *) |
| 452 |
err: Integer; |
| 453 |
begin |
| 454 |
c_stream.zalloc := NIL; |
| 455 |
c_stream.zfree := NIL; |
| 456 |
c_stream.opaque := NIL; |
| 457 |
|
| 458 |
err := deflateInit(c_stream, Z_BEST_COMPRESSION); |
| 459 |
CHECK_ERR(err, 'deflateInit'); |
| 460 |
|
| 461 |
err := deflateSetDictionary(c_stream, dictionary, StrLen(dictionary)); |
| 462 |
CHECK_ERR(err, 'deflateSetDictionary'); |
| 463 |
|
| 464 |
dictId := c_stream.adler; |
| 465 |
c_stream.next_out := compr; |
| 466 |
c_stream.avail_out := Integer(comprLen); |
| 467 |
|
| 468 |
c_stream.next_in := hello; |
| 469 |
c_stream.avail_in := StrLen(hello)+1; |
| 470 |
|
| 471 |
err := deflate(c_stream, Z_FINISH); |
| 472 |
if err <> Z_STREAM_END then |
| 473 |
EXIT_ERR('deflate should report Z_STREAM_END'); |
| 474 |
|
| 475 |
err := deflateEnd(c_stream); |
| 476 |
CHECK_ERR(err, 'deflateEnd'); |
| 477 |
end; |
| 478 |
{$ENDIF} |
| 479 |
|
| 480 |
(* =========================================================================== |
| 481 |
* Test inflate with a preset dictionary |
| 482 |
*) |
| 483 |
{$IFDEF TEST_DICT} |
| 484 |
procedure test_dict_inflate(compr: Pointer; comprLen: LongInt; |
| 485 |
uncompr: Pointer; uncomprLen: LongInt); |
| 486 |
var err: Integer; |
| 487 |
d_stream: z_stream; (* decompression stream *) |
| 488 |
begin |
| 489 |
StrCopy(PChar(uncompr), 'garbage'); |
| 490 |
|
| 491 |
d_stream.zalloc := NIL; |
| 492 |
d_stream.zfree := NIL; |
| 493 |
d_stream.opaque := NIL; |
| 494 |
|
| 495 |
d_stream.next_in := compr; |
| 496 |
d_stream.avail_in := Integer(comprLen); |
| 497 |
|
| 498 |
err := inflateInit(d_stream); |
| 499 |
CHECK_ERR(err, 'inflateInit'); |
| 500 |
|
| 501 |
d_stream.next_out := uncompr; |
| 502 |
d_stream.avail_out := Integer(uncomprLen); |
| 503 |
|
| 504 |
while TRUE do |
| 505 |
begin |
| 506 |
err := inflate(d_stream, Z_NO_FLUSH); |
| 507 |
if err = Z_STREAM_END then |
| 508 |
break; |
| 509 |
if err = Z_NEED_DICT then |
| 510 |
begin |
| 511 |
if d_stream.adler <> dictId then |
| 512 |
EXIT_ERR('unexpected dictionary'); |
| 513 |
err := inflateSetDictionary(d_stream, dictionary, StrLen(dictionary)); |
| 514 |
end; |
| 515 |
CHECK_ERR(err, 'inflate with dict'); |
| 516 |
end; |
| 517 |
|
| 518 |
err := inflateEnd(d_stream); |
| 519 |
CHECK_ERR(err, 'inflateEnd'); |
| 520 |
|
| 521 |
if StrComp(PChar(uncompr), hello) <> 0 then |
| 522 |
EXIT_ERR('bad inflate with dict') |
| 523 |
else |
| 524 |
WriteLn('inflate with dictionary: ', PChar(uncompr)); |
| 525 |
end; |
| 526 |
{$ENDIF} |
| 527 |
|
| 528 |
var compr, uncompr: Pointer; |
| 529 |
comprLen, uncomprLen: LongInt; |
| 530 |
|
| 531 |
begin |
| 532 |
if zlibVersion^ <> ZLIB_VERSION[1] then |
| 533 |
EXIT_ERR('Incompatible zlib version'); |
| 534 |
|
| 535 |
WriteLn('zlib version: ', zlibVersion); |
| 536 |
WriteLn('zlib compile flags: ', Format('0x%x', [zlibCompileFlags])); |
| 537 |
|
| 538 |
comprLen := 10000 * SizeOf(Integer); (* don't overflow on MSDOS *) |
| 539 |
uncomprLen := comprLen; |
| 540 |
GetMem(compr, comprLen); |
| 541 |
GetMem(uncompr, uncomprLen); |
| 542 |
if (compr = NIL) or (uncompr = NIL) then |
| 543 |
EXIT_ERR('Out of memory'); |
| 544 |
(* compr and uncompr are cleared to avoid reading uninitialized |
| 545 |
* data and to ensure that uncompr compresses well. |
| 546 |
*) |
| 547 |
FillChar(compr^, comprLen, 0); |
| 548 |
FillChar(uncompr^, uncomprLen, 0); |
| 549 |
|
| 550 |
{$IFDEF TEST_COMPRESS} |
| 551 |
WriteLn('** Testing compress'); |
| 552 |
test_compress(compr, comprLen, uncompr, uncomprLen); |
| 553 |
{$ENDIF} |
| 554 |
|
| 555 |
{$IFDEF TEST_GZIO} |
| 556 |
WriteLn('** Testing gzio'); |
| 557 |
if ParamCount >= 1 then |
| 558 |
test_gzio(ParamStr(1), uncompr, uncomprLen) |
| 559 |
else |
| 560 |
test_gzio(TESTFILE, uncompr, uncomprLen); |
| 561 |
{$ENDIF} |
| 562 |
|
| 563 |
{$IFDEF TEST_DEFLATE} |
| 564 |
WriteLn('** Testing deflate with small buffers'); |
| 565 |
test_deflate(compr, comprLen); |
| 566 |
{$ENDIF} |
| 567 |
{$IFDEF TEST_INFLATE} |
| 568 |
WriteLn('** Testing inflate with small buffers'); |
| 569 |
test_inflate(compr, comprLen, uncompr, uncomprLen); |
| 570 |
{$ENDIF} |
| 571 |
|
| 572 |
{$IFDEF TEST_DEFLATE} |
| 573 |
WriteLn('** Testing deflate with large buffers'); |
| 574 |
test_large_deflate(compr, comprLen, uncompr, uncomprLen); |
| 575 |
{$ENDIF} |
| 576 |
{$IFDEF TEST_INFLATE} |
| 577 |
WriteLn('** Testing inflate with large buffers'); |
| 578 |
test_large_inflate(compr, comprLen, uncompr, uncomprLen); |
| 579 |
{$ENDIF} |
| 580 |
|
| 581 |
{$IFDEF TEST_FLUSH} |
| 582 |
WriteLn('** Testing deflate with full flush'); |
| 583 |
test_flush(compr, comprLen); |
| 584 |
{$ENDIF} |
| 585 |
{$IFDEF TEST_SYNC} |
| 586 |
WriteLn('** Testing inflateSync'); |
| 587 |
test_sync(compr, comprLen, uncompr, uncomprLen); |
| 588 |
{$ENDIF} |
| 589 |
comprLen := uncomprLen; |
| 590 |
|
| 591 |
{$IFDEF TEST_DICT} |
| 592 |
WriteLn('** Testing deflate and inflate with preset dictionary'); |
| 593 |
test_dict_deflate(compr, comprLen); |
| 594 |
test_dict_inflate(compr, comprLen, uncompr, uncomprLen); |
| 595 |
{$ENDIF} |
| 596 |
|
| 597 |
FreeMem(compr, comprLen); |
| 598 |
FreeMem(uncompr, uncomprLen); |
| 599 |
end. |
