third_party: Remove zlib from third_party

[garming/samba-autobuild/.git] / third_party / zlib / contrib / delphi / readme.txt

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-
-Overview
-========
-
-This directory contains an update to the ZLib interface unit,
-distributed by Borland as a Delphi supplemental component.
-
-The original ZLib unit is Copyright (c) 1997,99 Borland Corp.,
-and is based on zlib version 1.0.4.  There are a series of bugs
-and security problems associated with that old zlib version, and
-we recommend the users to update their ZLib unit.
-
-
-Summary of modifications
-========================
-
-- Improved makefile, adapted to zlib version 1.2.1.
-
-- Some field types from TZStreamRec are changed from Integer to
-  Longint, for consistency with the zlib.h header, and for 64-bit
-  readiness.
-
-- The zlib_version constant is updated.
-
-- The new Z_RLE strategy has its corresponding symbolic constant.
-
-- The allocation and deallocation functions and function types
-  (TAlloc, TFree, zlibAllocMem and zlibFreeMem) are now cdecl,
-  and _malloc and _free are added as C RTL stubs.  As a result,
-  the original C sources of zlib can be compiled out of the box,
-  and linked to the ZLib unit.
-
-
-Suggestions for improvements
-============================
-
-Currently, the ZLib unit provides only a limited wrapper around
-the zlib library, and much of the original zlib functionality is
-missing.  Handling compressed file formats like ZIP/GZIP or PNG
-cannot be implemented without having this functionality.
-Applications that handle these formats are either using their own,
-duplicated code, or not using the ZLib unit at all.
-
-Here are a few suggestions:
-
-- Checksum class wrappers around adler32() and crc32(), similar
-  to the Java classes that implement the java.util.zip.Checksum
-  interface.
-
-- The ability to read and write raw deflate streams, without the
-  zlib stream header and trailer.  Raw deflate streams are used
-  in the ZIP file format.
-
-- The ability to read and write gzip streams, used in the GZIP
-  file format, and normally produced by the gzip program.
-
-- The ability to select a different compression strategy, useful
-  to PNG and MNG image compression, and to multimedia compression
-  in general.  Besides the compression level
-
-    TCompressionLevel = (clNone, clFastest, clDefault, clMax);
-
-  which, in fact, could have used the 'z' prefix and avoided
-  TColor-like symbols
-
-    TCompressionLevel = (zcNone, zcFastest, zcDefault, zcMax);
-
-  there could be a compression strategy
-
-    TCompressionStrategy = (zsDefault, zsFiltered, zsHuffmanOnly, zsRle);
-
-- ZIP and GZIP stream handling via TStreams.
-
-
---
-Cosmin Truta <cosmint@cs.ubbcluj.ro>