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77 lines
2.9 KiB
Plaintext
77 lines
2.9 KiB
Plaintext
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This directory contains a Pascal (Delphi, Kylix) interface to the
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zlib data compression library.
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Directory listing
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=================
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zlibd32.mak makefile for Borland C++
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example.pas usage example of zlib
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zlibpas.pas the Pascal interface to zlib
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readme.txt this file
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Compatibility notes
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===================
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- Although the name "zlib" would have been more normal for the
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zlibpas unit, this name is already taken by Borland's ZLib unit.
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This is somehow unfortunate, because that unit is not a genuine
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interface to the full-fledged zlib functionality, but a suite of
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class wrappers around zlib streams. Other essential features,
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such as checksums, are missing.
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It would have been more appropriate for that unit to have a name
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like "ZStreams", or something similar.
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- The C and zlib-supplied types int, uInt, long, uLong, etc. are
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translated directly into Pascal types of similar sizes (Integer,
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LongInt, etc.), to avoid namespace pollution. In particular,
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there is no conversion of unsigned int into a Pascal unsigned
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integer. The Word type is non-portable and has the same size
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(16 bits) both in a 16-bit and in a 32-bit environment, unlike
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Integer. Even if there is a 32-bit Cardinal type, there is no
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real need for unsigned int in zlib under a 32-bit environment.
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- Except for the callbacks, the zlib function interfaces are
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assuming the calling convention normally used in Pascal
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(__pascal for DOS and Windows16, __fastcall for Windows32).
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Since the cdecl keyword is used, the old Turbo Pascal does
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not work with this interface.
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- The gz* function interfaces are not translated, to avoid
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interfacing problems with the C runtime library. Besides,
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gzprintf(gzFile file, const char *format, ...)
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cannot be translated into Pascal.
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Legal issues
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============
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The zlibpas interface is:
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Copyright (C) 1995-2003 Jean-loup Gailly and Mark Adler.
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Copyright (C) 1998 by Bob Dellaca.
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Copyright (C) 2003 by Cosmin Truta.
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The example program is:
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Copyright (C) 1995-2003 by Jean-loup Gailly.
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Copyright (C) 1998,1999,2000 by Jacques Nomssi Nzali.
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Copyright (C) 2003 by Cosmin Truta.
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the author be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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