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annotate zlib/examples/gzlog.h @ 51:ae3a4bfb450b

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add some files of version 4.4.3 that have been forgotten.
author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Sun, 07 Feb 2010 18:27:48 +0900
parents
children 04ced10e8804
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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51
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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1 /* gzlog.h
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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2 Copyright (C) 2004 Mark Adler, all rights reserved
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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3 version 1.0, 26 Nov 2004
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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4
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
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5 This software is provided 'as-is', without any express or implied
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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6 warranty. In no event will the author be held liable for any damages
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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7 arising from the use of this software.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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8
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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9 Permission is granted to anyone to use this software for any purpose,
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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10 including commercial applications, and to alter it and redistribute it
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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11 freely, subject to the following restrictions:
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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12
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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13 1. The origin of this software must not be misrepresented; you must not
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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14 claim that you wrote the original software. If you use this software
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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15 in a product, an acknowledgment in the product documentation would be
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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16 appreciated but is not required.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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17 2. Altered source versions must be plainly marked as such, and must not be
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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18 misrepresented as being the original software.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
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19 3. This notice may not be removed or altered from any source distribution.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
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20
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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21 Mark Adler madler@alumni.caltech.edu
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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22 */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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23
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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24 /*
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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25 The gzlog object allows writing short messages to a gzipped log file,
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
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26 opening the log file locked for small bursts, and then closing it. The log
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
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27 object works by appending stored data to the gzip file until 1 MB has been
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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28 accumulated. At that time, the stored data is compressed, and replaces the
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
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29 uncompressed data in the file. The log file is truncated to its new size at
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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30 that time. After closing, the log file is always valid gzip file that can
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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31 decompressed to recover what was written.
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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32
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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33 A gzip header "extra" field contains two file offsets for appending. The
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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34 first points to just after the last compressed data. The second points to
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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35 the last stored block in the deflate stream, which is empty. All of the
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
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36 data between those pointers is uncompressed.
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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37 */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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38
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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39 /* Open a gzlog object, creating the log file if it does not exist. Return
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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40 NULL on error. Note that gzlog_open() could take a long time to return if
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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41 there is difficulty in locking the file. */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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42 void *gzlog_open(char *path);
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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43
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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44 /* Write to a gzlog object. Return non-zero on error. This function will
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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45 simply write data to the file uncompressed. Compression of the data
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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46 will not occur until gzlog_close() is called. It is expected that
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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47 gzlog_write() is used for a short message, and then gzlog_close() is
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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48 called. If a large amount of data is to be written, then the application
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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49 should write no more than 1 MB at a time with gzlog_write() before
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
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50 calling gzlog_close() and then gzlog_open() again. */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
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51 int gzlog_write(void *log, char *data, size_t len);
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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52
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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53 /* Close a gzlog object. Return non-zero on error. The log file is locked
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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54 until this function is called. This function will compress stored data
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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55 at the end of the gzip file if at least 1 MB has been accumulated. Note
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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56 that the file will not be a valid gzip file until this function completes.
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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57 */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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58 int gzlog_close(void *log);