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authorJelmer Vernooij <jelmer@samba.org>2008-10-21 14:51:13 +0200
committerJelmer Vernooij <jelmer@samba.org>2008-10-21 14:51:13 +0200
commit5209a846a9157e649fcdcb561f7eaf19c8c0e465 (patch)
treeb0a7e52b5646c8eec182dbc391e7934b6804488c /source4/lib/zlib/contrib/delphi/readme.txt
parent625359b2e266105022309df8985720108ecd6f67 (diff)
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Merge branch 'master' of ssh://git.samba.org/data/git/samba into regsrv
Conflicts: source4/lib/registry/ldb.c source4/rpc_server/winreg/rpc_winreg.c
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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>