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diff --git a/src/external/zlib-1.2.8/contrib/pascal/example.pas b/src/external/zlib-1.2.8/contrib/pascal/example.pas
deleted file mode 100644
index 5518b36..0000000
--- a/src/external/zlib-1.2.8/contrib/pascal/example.pas
+++ /dev/null
@@ -1,599 +0,0 @@
-(* example.c -- usage example of the zlib compression library
- * Copyright (C) 1995-2003 Jean-loup Gailly.
- * For conditions of distribution and use, see copyright notice in zlib.h
- *
- * Pascal translation
- * Copyright (C) 1998 by Jacques Nomssi Nzali.
- * For conditions of distribution and use, see copyright notice in readme.txt
- *
- * Adaptation to the zlibpas interface
- * Copyright (C) 2003 by Cosmin Truta.
- * For conditions of distribution and use, see copyright notice in readme.txt
- *)
-
-program example;
-
-{$DEFINE TEST_COMPRESS}
-{DO NOT $DEFINE TEST_GZIO}
-{$DEFINE TEST_DEFLATE}
-{$DEFINE TEST_INFLATE}
-{$DEFINE TEST_FLUSH}
-{$DEFINE TEST_SYNC}
-{$DEFINE TEST_DICT}
-
-uses SysUtils, zlibpas;
-
-const TESTFILE = 'foo.gz';
-
-(* "hello world" would be more standard, but the repeated "hello"
- * stresses the compression code better, sorry...
- *)
-const hello: PChar = 'hello, hello!';
-
-const dictionary: PChar = 'hello';
-
-var dictId: LongInt; (* Adler32 value of the dictionary *)
-
-procedure CHECK_ERR(err: Integer; msg: String);
-begin
-  if err <> Z_OK then
-  begin
-    WriteLn(msg, ' error: ', err);
-    Halt(1);
-  end;
-end;
-
-procedure EXIT_ERR(const msg: String);
-begin
-  WriteLn('Error: ', msg);
-  Halt(1);
-end;
-
-(* ===========================================================================
- * Test compress and uncompress
- *)
-{$IFDEF TEST_COMPRESS}
-procedure test_compress(compr: Pointer; comprLen: LongInt;
-                        uncompr: Pointer; uncomprLen: LongInt);
-var err: Integer;
-    len: LongInt;
-begin
-  len := StrLen(hello)+1;
-
-  err := compress(compr, comprLen, hello, len);
-  CHECK_ERR(err, 'compress');
-
-  StrCopy(PChar(uncompr), 'garbage');
-
-  err := uncompress(uncompr, uncomprLen, compr, comprLen);
-  CHECK_ERR(err, 'uncompress');
-
-  if StrComp(PChar(uncompr), hello) <> 0 then
-    EXIT_ERR('bad uncompress')
-  else
-    WriteLn('uncompress(): ', PChar(uncompr));
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test read/write of .gz files
- *)
-{$IFDEF TEST_GZIO}
-procedure test_gzio(const fname: PChar; (* compressed file name *)
-                    uncompr: Pointer;
-                    uncomprLen: LongInt);
-var err: Integer;
-    len: Integer;
-    zfile: gzFile;
-    pos: LongInt;
-begin
-  len := StrLen(hello)+1;
-
-  zfile := gzopen(fname, 'wb');
-  if zfile = NIL then
-  begin
-    WriteLn('gzopen error');
-    Halt(1);
-  end;
-  gzputc(zfile, 'h');
-  if gzputs(zfile, 'ello') <> 4 then
-  begin
-    WriteLn('gzputs err: ', gzerror(zfile, err));
-    Halt(1);
-  end;
-  {$IFDEF GZ_FORMAT_STRING}
-  if gzprintf(zfile, ', %s!', 'hello') <> 8 then
-  begin
-    WriteLn('gzprintf err: ', gzerror(zfile, err));
-    Halt(1);
-  end;
-  {$ELSE}
-  if gzputs(zfile, ', hello!') <> 8 then
-  begin
-    WriteLn('gzputs err: ', gzerror(zfile, err));
-    Halt(1);
-  end;
-  {$ENDIF}
-  gzseek(zfile, 1, SEEK_CUR); (* add one zero byte *)
-  gzclose(zfile);
-
-  zfile := gzopen(fname, 'rb');
-  if zfile = NIL then
-  begin
-    WriteLn('gzopen error');
-    Halt(1);
-  end;
-
-  StrCopy(PChar(uncompr), 'garbage');
-
-  if gzread(zfile, uncompr, uncomprLen) <> len then
-  begin
-    WriteLn('gzread err: ', gzerror(zfile, err));
-    Halt(1);
-  end;
-  if StrComp(PChar(uncompr), hello) <> 0 then
-  begin
-    WriteLn('bad gzread: ', PChar(uncompr));
-    Halt(1);
-  end
-  else
-    WriteLn('gzread(): ', PChar(uncompr));
-
-  pos := gzseek(zfile, -8, SEEK_CUR);
-  if (pos <> 6) or (gztell(zfile) <> pos) then
-  begin
-    WriteLn('gzseek error, pos=', pos, ', gztell=', gztell(zfile));
-    Halt(1);
-  end;
-
-  if gzgetc(zfile) <> ' ' then
-  begin
-    WriteLn('gzgetc error');
-    Halt(1);
-  end;
-
-  if gzungetc(' ', zfile) <> ' ' then
-  begin
-    WriteLn('gzungetc error');
-    Halt(1);
-  end;
-
-  gzgets(zfile, PChar(uncompr), uncomprLen);
-  uncomprLen := StrLen(PChar(uncompr));
-  if uncomprLen <> 7 then (* " hello!" *)
-  begin
-    WriteLn('gzgets err after gzseek: ', gzerror(zfile, err));
-    Halt(1);
-  end;
-  if StrComp(PChar(uncompr), hello + 6) <> 0 then
-  begin
-    WriteLn('bad gzgets after gzseek');
-    Halt(1);
-  end
-  else
-    WriteLn('gzgets() after gzseek: ', PChar(uncompr));
-
-  gzclose(zfile);
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test deflate with small buffers
- *)
-{$IFDEF TEST_DEFLATE}
-procedure test_deflate(compr: Pointer; comprLen: LongInt);
-var c_stream: z_stream; (* compression stream *)
-    err: Integer;
-    len: LongInt;
-begin
-  len := StrLen(hello)+1;
-
-  c_stream.zalloc := NIL;
-  c_stream.zfree := NIL;
-  c_stream.opaque := NIL;
-
-  err := deflateInit(c_stream, Z_DEFAULT_COMPRESSION);
-  CHECK_ERR(err, 'deflateInit');
-
-  c_stream.next_in := hello;
-  c_stream.next_out := compr;
-
-  while (c_stream.total_in <> len) and
-        (c_stream.total_out < comprLen) do
-  begin
-    c_stream.avail_out := 1; { force small buffers }
-    c_stream.avail_in := 1;
-    err := deflate(c_stream, Z_NO_FLUSH);
-    CHECK_ERR(err, 'deflate');
-  end;
-
-  (* Finish the stream, still forcing small buffers: *)
-  while TRUE do
-  begin
-    c_stream.avail_out := 1;
-    err := deflate(c_stream, Z_FINISH);
-    if err = Z_STREAM_END then
-      break;
-    CHECK_ERR(err, 'deflate');
-  end;
-
-  err := deflateEnd(c_stream);
-  CHECK_ERR(err, 'deflateEnd');
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test inflate with small buffers
- *)
-{$IFDEF TEST_INFLATE}
-procedure test_inflate(compr: Pointer; comprLen : LongInt;
-                       uncompr: Pointer; uncomprLen : LongInt);
-var err: Integer;
-    d_stream: z_stream; (* decompression stream *)
-begin
-  StrCopy(PChar(uncompr), 'garbage');
-
-  d_stream.zalloc := NIL;
-  d_stream.zfree := NIL;
-  d_stream.opaque := NIL;
-
-  d_stream.next_in := compr;
-  d_stream.avail_in := 0;
-  d_stream.next_out := uncompr;
-
-  err := inflateInit(d_stream);
-  CHECK_ERR(err, 'inflateInit');
-
-  while (d_stream.total_out < uncomprLen) and
-        (d_stream.total_in < comprLen) do
-  begin
-    d_stream.avail_out := 1; (* force small buffers *)
-    d_stream.avail_in := 1;
-    err := inflate(d_stream, Z_NO_FLUSH);
-    if err = Z_STREAM_END then
-      break;
-    CHECK_ERR(err, 'inflate');
-  end;
-
-  err := inflateEnd(d_stream);
-  CHECK_ERR(err, 'inflateEnd');
-
-  if StrComp(PChar(uncompr), hello) <> 0 then
-    EXIT_ERR('bad inflate')
-  else
-    WriteLn('inflate(): ', PChar(uncompr));
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test deflate with large buffers and dynamic change of compression level
- *)
-{$IFDEF TEST_DEFLATE}
-procedure test_large_deflate(compr: Pointer; comprLen: LongInt;
-                             uncompr: Pointer; uncomprLen: LongInt);
-var c_stream: z_stream; (* compression stream *)
-    err: Integer;
-begin
-  c_stream.zalloc := NIL;
-  c_stream.zfree := NIL;
-  c_stream.opaque := NIL;
-
-  err := deflateInit(c_stream, Z_BEST_SPEED);
-  CHECK_ERR(err, 'deflateInit');
-
-  c_stream.next_out := compr;
-  c_stream.avail_out := Integer(comprLen);
-
-  (* At this point, uncompr is still mostly zeroes, so it should compress
-   * very well:
-   *)
-  c_stream.next_in := uncompr;
-  c_stream.avail_in := Integer(uncomprLen);
-  err := deflate(c_stream, Z_NO_FLUSH);
-  CHECK_ERR(err, 'deflate');
-  if c_stream.avail_in <> 0 then
-    EXIT_ERR('deflate not greedy');
-
-  (* Feed in already compressed data and switch to no compression: *)
-  deflateParams(c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
-  c_stream.next_in := compr;
-  c_stream.avail_in := Integer(comprLen div 2);
-  err := deflate(c_stream, Z_NO_FLUSH);
-  CHECK_ERR(err, 'deflate');
-
-  (* Switch back to compressing mode: *)
-  deflateParams(c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
-  c_stream.next_in := uncompr;
-  c_stream.avail_in := Integer(uncomprLen);
-  err := deflate(c_stream, Z_NO_FLUSH);
-  CHECK_ERR(err, 'deflate');
-
-  err := deflate(c_stream, Z_FINISH);
-  if err <> Z_STREAM_END then
-    EXIT_ERR('deflate should report Z_STREAM_END');
-
-  err := deflateEnd(c_stream);
-  CHECK_ERR(err, 'deflateEnd');
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test inflate with large buffers
- *)
-{$IFDEF TEST_INFLATE}
-procedure test_large_inflate(compr: Pointer; comprLen: LongInt;
-                             uncompr: Pointer; uncomprLen: LongInt);
-var err: Integer;
-    d_stream: z_stream; (* decompression stream *)
-begin
-  StrCopy(PChar(uncompr), 'garbage');
-
-  d_stream.zalloc := NIL;
-  d_stream.zfree := NIL;
-  d_stream.opaque := NIL;
-
-  d_stream.next_in := compr;
-  d_stream.avail_in := Integer(comprLen);
-
-  err := inflateInit(d_stream);
-  CHECK_ERR(err, 'inflateInit');
-
-  while TRUE do
-  begin
-    d_stream.next_out := uncompr;            (* discard the output *)
-    d_stream.avail_out := Integer(uncomprLen);
-    err := inflate(d_stream, Z_NO_FLUSH);
-    if err = Z_STREAM_END then
-      break;
-    CHECK_ERR(err, 'large inflate');
-  end;
-
-  err := inflateEnd(d_stream);
-  CHECK_ERR(err, 'inflateEnd');
-
-  if d_stream.total_out <> 2 * uncomprLen + comprLen div 2 then
-  begin
-    WriteLn('bad large inflate: ', d_stream.total_out);
-    Halt(1);
-  end
-  else
-    WriteLn('large_inflate(): OK');
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test deflate with full flush
- *)
-{$IFDEF TEST_FLUSH}
-procedure test_flush(compr: Pointer; var comprLen : LongInt);
-var c_stream: z_stream; (* compression stream *)
-    err: Integer;
-    len: Integer;
-begin
-  len := StrLen(hello)+1;
-
-  c_stream.zalloc := NIL;
-  c_stream.zfree := NIL;
-  c_stream.opaque := NIL;
-
-  err := deflateInit(c_stream, Z_DEFAULT_COMPRESSION);
-  CHECK_ERR(err, 'deflateInit');
-
-  c_stream.next_in := hello;
-  c_stream.next_out := compr;
-  c_stream.avail_in := 3;
-  c_stream.avail_out := Integer(comprLen);
-  err := deflate(c_stream, Z_FULL_FLUSH);
-  CHECK_ERR(err, 'deflate');
-
-  Inc(PByteArray(compr)^[3]); (* force an error in first compressed block *)
-  c_stream.avail_in := len - 3;
-
-  err := deflate(c_stream, Z_FINISH);
-  if err <> Z_STREAM_END then
-    CHECK_ERR(err, 'deflate');
-
-  err := deflateEnd(c_stream);
-  CHECK_ERR(err, 'deflateEnd');
-
-  comprLen := c_stream.total_out;
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test inflateSync()
- *)
-{$IFDEF TEST_SYNC}
-procedure test_sync(compr: Pointer; comprLen: LongInt;
-                    uncompr: Pointer; uncomprLen : LongInt);
-var err: Integer;
-    d_stream: z_stream; (* decompression stream *)
-begin
-  StrCopy(PChar(uncompr), 'garbage');
-
-  d_stream.zalloc := NIL;
-  d_stream.zfree := NIL;
-  d_stream.opaque := NIL;
-
-  d_stream.next_in := compr;
-  d_stream.avail_in := 2; (* just read the zlib header *)
-
-  err := inflateInit(d_stream);
-  CHECK_ERR(err, 'inflateInit');
-
-  d_stream.next_out := uncompr;
-  d_stream.avail_out := Integer(uncomprLen);
-
-  inflate(d_stream, Z_NO_FLUSH);
-  CHECK_ERR(err, 'inflate');
-
-  d_stream.avail_in := Integer(comprLen-2);   (* read all compressed data *)
-  err := inflateSync(d_stream);               (* but skip the damaged part *)
-  CHECK_ERR(err, 'inflateSync');
-
-  err := inflate(d_stream, Z_FINISH);
-  if err <> Z_DATA_ERROR then
-    EXIT_ERR('inflate should report DATA_ERROR');
-    (* Because of incorrect adler32 *)
-
-  err := inflateEnd(d_stream);
-  CHECK_ERR(err, 'inflateEnd');
-
-  WriteLn('after inflateSync(): hel', PChar(uncompr));
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test deflate with preset dictionary
- *)
-{$IFDEF TEST_DICT}
-procedure test_dict_deflate(compr: Pointer; comprLen: LongInt);
-var c_stream: z_stream; (* compression stream *)
-    err: Integer;
-begin
-  c_stream.zalloc := NIL;
-  c_stream.zfree := NIL;
-  c_stream.opaque := NIL;
-
-  err := deflateInit(c_stream, Z_BEST_COMPRESSION);
-  CHECK_ERR(err, 'deflateInit');
-
-  err := deflateSetDictionary(c_stream, dictionary, StrLen(dictionary));
-  CHECK_ERR(err, 'deflateSetDictionary');
-
-  dictId := c_stream.adler;
-  c_stream.next_out := compr;
-  c_stream.avail_out := Integer(comprLen);
-
-  c_stream.next_in := hello;
-  c_stream.avail_in := StrLen(hello)+1;
-
-  err := deflate(c_stream, Z_FINISH);
-  if err <> Z_STREAM_END then
-    EXIT_ERR('deflate should report Z_STREAM_END');
-
-  err := deflateEnd(c_stream);
-  CHECK_ERR(err, 'deflateEnd');
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test inflate with a preset dictionary
- *)
-{$IFDEF TEST_DICT}
-procedure test_dict_inflate(compr: Pointer; comprLen: LongInt;
-                            uncompr: Pointer; uncomprLen: LongInt);
-var err: Integer;
-    d_stream: z_stream; (* decompression stream *)
-begin
-  StrCopy(PChar(uncompr), 'garbage');
-
-  d_stream.zalloc := NIL;
-  d_stream.zfree := NIL;
-  d_stream.opaque := NIL;
-
-  d_stream.next_in := compr;
-  d_stream.avail_in := Integer(comprLen);
-
-  err := inflateInit(d_stream);
-  CHECK_ERR(err, 'inflateInit');
-
-  d_stream.next_out := uncompr;
-  d_stream.avail_out := Integer(uncomprLen);
-
-  while TRUE do
-  begin
-    err := inflate(d_stream, Z_NO_FLUSH);
-    if err = Z_STREAM_END then
-      break;
-    if err = Z_NEED_DICT then
-    begin
-      if d_stream.adler <> dictId then
-        EXIT_ERR('unexpected dictionary');
-      err := inflateSetDictionary(d_stream, dictionary, StrLen(dictionary));
-    end;
-    CHECK_ERR(err, 'inflate with dict');
-  end;
-
-  err := inflateEnd(d_stream);
-  CHECK_ERR(err, 'inflateEnd');
-
-  if StrComp(PChar(uncompr), hello) <> 0 then
-    EXIT_ERR('bad inflate with dict')
-  else
-    WriteLn('inflate with dictionary: ', PChar(uncompr));
-end;
-{$ENDIF}
-
-var compr, uncompr: Pointer;
-    comprLen, uncomprLen: LongInt;
-
-begin
-  if zlibVersion^ <> ZLIB_VERSION[1] then
-    EXIT_ERR('Incompatible zlib version');
-
-  WriteLn('zlib version: ', zlibVersion);
-  WriteLn('zlib compile flags: ', Format('0x%x', [zlibCompileFlags]));
-
-  comprLen := 10000 * SizeOf(Integer); (* don't overflow on MSDOS *)
-  uncomprLen := comprLen;
-  GetMem(compr, comprLen);
-  GetMem(uncompr, uncomprLen);
-  if (compr = NIL) or (uncompr = NIL) then
-    EXIT_ERR('Out of memory');
-  (* compr and uncompr are cleared to avoid reading uninitialized
-   * data and to ensure that uncompr compresses well.
-   *)
-  FillChar(compr^, comprLen, 0);
-  FillChar(uncompr^, uncomprLen, 0);
-
-  {$IFDEF TEST_COMPRESS}
-  WriteLn('** Testing compress');
-  test_compress(compr, comprLen, uncompr, uncomprLen);
-  {$ENDIF}
-
-  {$IFDEF TEST_GZIO}
-  WriteLn('** Testing gzio');
-  if ParamCount >= 1 then
-    test_gzio(ParamStr(1), uncompr, uncomprLen)
-  else
-    test_gzio(TESTFILE, uncompr, uncomprLen);
-  {$ENDIF}
-
-  {$IFDEF TEST_DEFLATE}
-  WriteLn('** Testing deflate with small buffers');
-  test_deflate(compr, comprLen);
-  {$ENDIF}
-  {$IFDEF TEST_INFLATE}
-  WriteLn('** Testing inflate with small buffers');
-  test_inflate(compr, comprLen, uncompr, uncomprLen);
-  {$ENDIF}
-
-  {$IFDEF TEST_DEFLATE}
-  WriteLn('** Testing deflate with large buffers');
-  test_large_deflate(compr, comprLen, uncompr, uncomprLen);
-  {$ENDIF}
-  {$IFDEF TEST_INFLATE}
-  WriteLn('** Testing inflate with large buffers');
-  test_large_inflate(compr, comprLen, uncompr, uncomprLen);
-  {$ENDIF}
-
-  {$IFDEF TEST_FLUSH}
-  WriteLn('** Testing deflate with full flush');
-  test_flush(compr, comprLen);
-  {$ENDIF}
-  {$IFDEF TEST_SYNC}
-  WriteLn('** Testing inflateSync');
-  test_sync(compr, comprLen, uncompr, uncomprLen);
-  {$ENDIF}
-  comprLen := uncomprLen;
-
-  {$IFDEF TEST_DICT}
-  WriteLn('** Testing deflate and inflate with preset dictionary');
-  test_dict_deflate(compr, comprLen);
-  test_dict_inflate(compr, comprLen, uncompr, uncomprLen);
-  {$ENDIF}
-
-  FreeMem(compr, comprLen);
-  FreeMem(uncompr, uncomprLen);
-end.