147 lines
5.0 KiB
Plaintext
147 lines
5.0 KiB
Plaintext
**********************************************************************
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* Copyright (c) 2003-2006, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* Author: Alan Liu
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* Created: August 18 2003
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* Since: ICU 2.8
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**********************************************************************
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----------------------------------------------------------------------
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OVERVIEW
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This file describes the tools in icu/source/tools/tzcode
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The purpose of these tools is to process the zoneinfo or "Olson" time
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zone database into a form usable by ICU4C (release 2.8 and later).
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Unlike earlier releases, ICU4C 2.8 supports historical time zone
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behavior, as well as the full set of Olson compatibility IDs.
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References:
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ICU4C: http://icu.sourceforge.net/
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Olson: ftp://elsie.nci.nih.gov/pub/
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----------------------------------------------------------------------
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ICU4C vs. ICU4J
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For ICU releases >= 2.8, both ICU4C and ICU4J implement full
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historical time zones, based on Olson data. The implementations in C
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and Java are somewhat different. The C implementation is a
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self-contained implementation, whereas ICU4J uses the underlying JDK
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1.3 or 1.4 time zone implementation.
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Older versions of ICU (C and Java <= 2.6) implement a "present day
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snapshot". This only reflects current time zone behavior, without
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historical variation. Furthermore, it lacks the full set of Olson
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compatibility IDs.
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BACKGROUND
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The zoneinfo or "Olson" time zone package is used by various systems
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to describe the behavior of time zones. The package consists of
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several parts. E.g.:
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Index of ftp://elsie.nci.nih.gov/pub/
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classictzcode.tar.gz 65 KB 12/10/1994 12:00:00 AM
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classictzdata.tar.gz 67 KB 12/10/1994 12:00:00 AM
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e5+57.tar.gz 2909 KB 3/22/1993 12:00:00 AM
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iso8601.ps.gz 16 KB 7/27/1996 12:00:00 AM
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leastsq.xls 49 KB 4/24/1997 12:00:00 AM
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ltroff.tar.gz 36 KB 7/16/1993 12:00:00 AM
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pi.shar.gz 4 KB 3/9/1994 12:00:00 AM
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tzarchive.gz 3412 KB 8/18/2003 4:00:00 AM
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tzcode2003a.tar.gz 98 KB 3/24/2003 2:32:00 PM
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tzdata2003a.tar.gz 132 KB 3/24/2003 2:32:00 PM
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ICU only uses the tzcodeYYYYV.tar.gz and tzdataYYYYV.tar.gz files,
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where YYYY is the year and V is the version letter ('a'...'z').
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HOWTO
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1. Obtain the current versions of tzcodeYYYYV.tar.gz (aka `tzcode')
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and tzdataYYYYV.tar.gz (aka `tzdata') from the FTP site given
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above. Either manually download or use wget:
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$ cd {path_to}/icu/source/tools/tzcode
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$ wget "ftp://elsie.nci.nih.gov/pub/tz*.tar.gz"
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2. Unpack tzcode and tzdata directly into the directory tzcode:
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$ tar xzvf tzcode*.tar.gz
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$ tar xzvf tzdata*.tar.gz
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*** Make sure you only have ONE FILE named tzdata*.tar.gz in the
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directory.
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*** Do NOT delete the tzdata*.tar.gz file.
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The Makefile looks in the current directory to determine the
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version of Olson data it is building by looking for tzdata*.tar.gz.
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3. Apply the ICU patch to zic.c:
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$ patch < patch-icu-tzcode
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If patch complains at this point, there is a mismatch that must be
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manually addressed. See the CVS log of `patch-icu-tzcode' for
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version details.
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4. Build:
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$ make icu_data
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5. Copy the data files to the correct location in the ICU4C/ICU4J
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source trees:
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$ cp zoneinfo.txt ../../data/misc/
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$ cp ZoneMetaData.java {path_to}/icu4j/src/com/ibm/icu/impl
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6. Rebuild ICU:
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$ cd ../..
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$ {*make}
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7. Don't forget to check in the new zoneinfo.txt (from its location at
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{path_to}/icu/source/data/misc/zoneinfo.txt) into CVS.
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HOWTO regenerate patch-icu-tzcode
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If you need to edit any of the tzcode* files, you will need to
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regenerate the patch file as follows.
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1. Follow the above instructions to extract and patch the tzcode*
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files in {path_to}/icu/source/tools/tzcode. Modify any of the
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tzcode files.
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2. Extract a clean set of the tzcode* files into a new directory,
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../tzcode.orig/:
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$ mkdir ../tzcode.orig
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$ cd ../tzcode.orig
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$ tar xzf ../tzcode/tzcode*.tar.gz
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$ cd ../tzcode
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3. Compute diffs, ignoring files that are in only one directory:
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$ diff -ur ../tzcode.orig . | grep -vE -e "^Only in " > patch-icu-tzcode
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4. Test the patch-icu-tzcode file by regenerating and diffing the
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files again in another directory. The expected output from the
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final diff command is *nothing*.
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$ mkdir ../tzcode.new
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$ cd ../tzcode.new
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$ tar xzf ../tzcode/tzcode*.tar.gz
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$ patch < ../tzcode/patch-icu-tzcode
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$ cd ../tzcode
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$ diff -ur ../tzcode.new . | grep -vE -e "^Only in "
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5. Check in the new patch-icu-tzcode file.
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----------------------------------------------------------------------
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eof
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