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1
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2 This directory contains a Pascal (Delphi, Kylix) interface to the
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3 zlib data compression library.
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4
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5
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6 Directory listing
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7 =================
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8
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9 zlibd32.mak makefile for Borland C++
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10 example.pas usage example of zlib
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11 zlibpas.pas the Pascal interface to zlib
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12 readme.txt this file
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13
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14
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15 Compatibility notes
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16 ===================
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17
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18 - Although the name "zlib" would have been more normal for the
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19 zlibpas unit, this name is already taken by Borland's ZLib unit.
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20 This is somehow unfortunate, because that unit is not a genuine
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21 interface to the full-fledged zlib functionality, but a suite of
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22 class wrappers around zlib streams. Other essential features,
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23 such as checksums, are missing.
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24 It would have been more appropriate for that unit to have a name
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25 like "ZStreams", or something similar.
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26
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27 - The C and zlib-supplied types int, uInt, long, uLong, etc. are
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28 translated directly into Pascal types of similar sizes (Integer,
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29 LongInt, etc.), to avoid namespace pollution. In particular,
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30 there is no conversion of unsigned int into a Pascal unsigned
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31 integer. The Word type is non-portable and has the same size
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32 (16 bits) both in a 16-bit and in a 32-bit environment, unlike
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33 Integer. Even if there is a 32-bit Cardinal type, there is no
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34 real need for unsigned int in zlib under a 32-bit environment.
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35
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36 - Except for the callbacks, the zlib function interfaces are
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37 assuming the calling convention normally used in Pascal
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38 (__pascal for DOS and Windows16, __fastcall for Windows32).
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39 Since the cdecl keyword is used, the old Turbo Pascal does
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40 not work with this interface.
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41
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42 - The gz* function interfaces are not translated, to avoid
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43 interfacing problems with the C runtime library. Besides,
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44 gzprintf(gzFile file, const char *format, ...)
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45 cannot be translated into Pascal.
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46
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47
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48 Legal issues
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49 ============
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50
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51 The zlibpas interface is:
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52 Copyright (C) 1995-2003 Jean-loup Gailly and Mark Adler.
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53 Copyright (C) 1998 by Bob Dellaca.
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54 Copyright (C) 2003 by Cosmin Truta.
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55
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56 The example program is:
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57 Copyright (C) 1995-2003 by Jean-loup Gailly.
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58 Copyright (C) 1998,1999,2000 by Jacques Nomssi Nzali.
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59 Copyright (C) 2003 by Cosmin Truta.
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60
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61 This software is provided 'as-is', without any express or implied
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62 warranty. In no event will the author be held liable for any damages
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63 arising from the use of this software.
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64
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65 Permission is granted to anyone to use this software for any purpose,
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66 including commercial applications, and to alter it and redistribute it
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67 freely, subject to the following restrictions:
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68
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69 1. The origin of this software must not be misrepresented; you must not
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70 claim that you wrote the original software. If you use this software
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71 in a product, an acknowledgment in the product documentation would be
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72 appreciated but is not required.
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73 2. Altered source versions must be plainly marked as such, and must not be
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74 misrepresented as being the original software.
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75 3. This notice may not be removed or altered from any source distribution.
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76
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