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(* example.c -- usage example of the zlib compression library |
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* Copyright (C) 1995-2003 Jean-loup Gailly. |
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* 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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program example; |
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{$DEFINE TEST_COMPRESS} |
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{DO NOT $DEFINE TEST_GZIO} |
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{$DEFINE TEST_DEFLATE} |
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{$DEFINE TEST_INFLATE} |
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{$DEFINE TEST_FLUSH} |
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{$DEFINE TEST_SYNC} |
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{$DEFINE TEST_DICT} |
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uses SysUtils, zlibpas; |
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const TESTFILE = 'foo.gz'; |
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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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const dictionary: PChar = 'hello'; |
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var dictId: LongInt; (* Adler32 value of the dictionary *) |
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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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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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* Test compress and uncompress |
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*) |
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{$IFDEF TEST_COMPRESS} |
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procedure test_compress(compr: Pointer; comprLen: LongInt; |
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uncompr: Pointer; uncomprLen: LongInt); |
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var err: Integer; |
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len: LongInt; |
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begin |
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len := StrLen(hello)+1; |
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err := compress(compr, comprLen, hello, len); |
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CHECK_ERR(err, 'compress'); |
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StrCopy(PChar(uncompr), 'garbage'); |
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err := uncompress(uncompr, uncomprLen, compr, comprLen); |
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CHECK_ERR(err, 'uncompress'); |
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if StrComp(PChar(uncompr), hello) <> 0 then |
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EXIT_ERR('bad uncompress') |
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else |
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WriteLn('uncompress(): ', PChar(uncompr)); |
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end; |
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{$ENDIF} |
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(* =========================================================================== |
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* Test read/write of .gz files |
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*) |
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{$IFDEF TEST_GZIO} |
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procedure test_gzio(const fname: PChar; (* compressed file name *) |
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uncompr: Pointer; |
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uncomprLen: LongInt); |
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var err: Integer; |
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len: Integer; |
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zfile: gzFile; |
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pos: LongInt; |
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begin |
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len := StrLen(hello)+1; |
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zfile := gzopen(fname, 'wb'); |
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if zfile = NIL then |
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begin |
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WriteLn('gzopen error'); |
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Halt(1); |
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end; |
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gzputc(zfile, 'h'); |
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if gzputs(zfile, 'ello') <> 4 then |
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begin |
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WriteLn('gzputs err: ', gzerror(zfile, err)); |
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Halt(1); |
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end; |
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{$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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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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StrCopy(PChar(uncompr), 'garbage'); |
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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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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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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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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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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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gzclose(zfile); |
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end; |
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{$ENDIF} |
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(* =========================================================================== |
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* Test deflate with small buffers |
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*) |
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{$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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c_stream.zalloc := NIL; |
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c_stream.zfree := NIL; |
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c_stream.opaque := NIL; |
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err := deflateInit(c_stream, Z_DEFAULT_COMPRESSION); |
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CHECK_ERR(err, 'deflateInit'); |
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c_stream.next_in := hello; |
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c_stream.next_out := compr; |
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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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(* 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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err := deflateEnd(c_stream); |
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CHECK_ERR(err, 'deflateEnd'); |
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end; |
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{$ENDIF} |
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(* =========================================================================== |
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* Test inflate with small buffers |
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*) |
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{$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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d_stream.zalloc := NIL; |
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d_stream.zfree := NIL; |
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d_stream.opaque := NIL; |
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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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err := inflateInit(d_stream); |
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CHECK_ERR(err, 'inflateInit'); |
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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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err := inflateEnd(d_stream); |
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CHECK_ERR(err, 'inflateEnd'); |
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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; |
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{$ENDIF} |
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(* =========================================================================== |
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* Test deflate with large buffers and dynamic change of compression level |
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*) |
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{$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; |
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begin |
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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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err := deflateInit(c_stream, Z_BEST_SPEED); |
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CHECK_ERR(err, 'deflateInit'); |
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c_stream.next_out := compr; |
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c_stream.avail_out := Integer(comprLen); |
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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); |
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CHECK_ERR(err, 'deflate'); |
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if c_stream.avail_in <> 0 then |
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EXIT_ERR('deflate not greedy'); |
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(* Feed in already compressed data and switch to no compression: *) |
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deflateParams(c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY); |
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c_stream.next_in := compr; |
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c_stream.avail_in := Integer(comprLen div 2); |
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err := deflate(c_stream, Z_NO_FLUSH); |
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CHECK_ERR(err, 'deflate'); |
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(* Switch back to compressing mode: *) |
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deflateParams(c_stream, Z_BEST_COMPRESSION, Z_FILTERED); |
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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); |
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CHECK_ERR(err, 'deflate'); |
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err := deflate(c_stream, Z_FINISH); |
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if err <> Z_STREAM_END then |
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EXIT_ERR('deflate should report Z_STREAM_END'); |
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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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{$ENDIF} |
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(* =========================================================================== |
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* Test inflate with large buffers |
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*) |
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{$IFDEF TEST_INFLATE} |
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procedure test_large_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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d_stream.zalloc := NIL; |
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d_stream.zfree := NIL; |
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d_stream.opaque := NIL; |
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d_stream.next_in := compr; |
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d_stream.avail_in := Integer(comprLen); |
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338
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err := inflateInit(d_stream); |
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CHECK_ERR(err, 'inflateInit'); |
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while TRUE do |
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begin |
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343
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d_stream.next_out := uncompr; (* discard the output *) |
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d_stream.avail_out := Integer(uncomprLen); |
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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, 'large inflate'); |
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end; |
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350
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351
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err := inflateEnd(d_stream); |
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352
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CHECK_ERR(err, 'inflateEnd'); |
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353
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if d_stream.total_out <> 2 * uncomprLen + comprLen div 2 then |
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begin |
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356
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WriteLn('bad large inflate: ', d_stream.total_out); |
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357
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Halt(1); |
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358
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end |
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359
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else |
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WriteLn('large_inflate(): OK'); |
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361
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end; |
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362
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{$ENDIF} |
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363
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364
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(* =========================================================================== |
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365
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* Test deflate with full flush |
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366
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*) |
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367
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{$IFDEF TEST_FLUSH} |
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368
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procedure test_flush(compr: Pointer; var comprLen : LongInt); |
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369
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var c_stream: z_stream; (* compression stream *) |
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err: Integer; |
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371
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len: Integer; |
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372
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begin |
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373
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len := StrLen(hello)+1; |
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374
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375
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c_stream.zalloc := NIL; |
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376
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c_stream.zfree := NIL; |
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377
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c_stream.opaque := NIL; |
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378
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379
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err := deflateInit(c_stream, Z_DEFAULT_COMPRESSION); |
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380
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CHECK_ERR(err, 'deflateInit'); |
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381
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382
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c_stream.next_in := hello; |
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c_stream.next_out := compr; |
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384
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c_stream.avail_in := 3; |
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385
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c_stream.avail_out := Integer(comprLen); |
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err := deflate(c_stream, Z_FULL_FLUSH); |
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CHECK_ERR(err, 'deflate'); |
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389
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Inc(PByteArray(compr)^[3]); (* force an error in first compressed block *) |
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c_stream.avail_in := len - 3; |
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391
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392
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err := deflate(c_stream, Z_FINISH); |
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if err <> Z_STREAM_END then |
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394
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CHECK_ERR(err, 'deflate'); |
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395
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396
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err := deflateEnd(c_stream); |
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CHECK_ERR(err, 'deflateEnd'); |
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398
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399
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comprLen := c_stream.total_out; |
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end; |
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401
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{$ENDIF} |
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402
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403
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(* =========================================================================== |
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404
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* Test inflateSync() |
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405
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*) |
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406
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{$IFDEF TEST_SYNC} |
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407
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procedure test_sync(compr: Pointer; comprLen: LongInt; |
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408
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uncompr: Pointer; uncomprLen : LongInt); |
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409
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var err: Integer; |
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410
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d_stream: z_stream; (* decompression stream *) |
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411
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begin |
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412
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StrCopy(PChar(uncompr), 'garbage'); |
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413
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414
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d_stream.zalloc := NIL; |
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415
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d_stream.zfree := NIL; |
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416
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d_stream.opaque := NIL; |
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417
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418
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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. |
|
600
|
|