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-/* gzlog.h
- Copyright (C) 2004 Mark Adler, all rights reserved
- version 1.0, 26 Nov 2004
-
- This software is provided 'as-is', without any express or implied
- warranty. In no event will the author be held liable for any damages
- arising from the use of this software.
-
- Permission is granted to anyone to use this software for any purpose,
- including commercial applications, and to alter it and redistribute it
- freely, subject to the following restrictions:
-
- 1. The origin of this software must not be misrepresented; you must not
- claim that you wrote the original software. If you use this software
- in a product, an acknowledgment in the product documentation would be
- appreciated but is not required.
- 2. Altered source versions must be plainly marked as such, and must not be
- misrepresented as being the original software.
- 3. This notice may not be removed or altered from any source distribution.
-
- Mark Adler madler@alumni.caltech.edu
- */
-
-/*
- The gzlog object allows writing short messages to a gzipped log file,
- opening the log file locked for small bursts, and then closing it. The log
- object works by appending stored data to the gzip file until 1 MB has been
- accumulated. At that time, the stored data is compressed, and replaces the
- uncompressed data in the file. The log file is truncated to its new size at
- that time. After closing, the log file is always valid gzip file that can
- decompressed to recover what was written.
-
- A gzip header "extra" field contains two file offsets for appending. The
- first points to just after the last compressed data. The second points to
- the last stored block in the deflate stream, which is empty. All of the
- data between those pointers is uncompressed.
- */
-
-/* Open a gzlog object, creating the log file if it does not exist. Return
- NULL on error. Note that gzlog_open() could take a long time to return if
- there is difficulty in locking the file. */
-void *gzlog_open(char *path);
-
-/* Write to a gzlog object. Return non-zero on error. This function will
- simply write data to the file uncompressed. Compression of the data
- will not occur until gzlog_close() is called. It is expected that
- gzlog_write() is used for a short message, and then gzlog_close() is
- called. If a large amount of data is to be written, then the application
- should write no more than 1 MB at a time with gzlog_write() before
- calling gzlog_close() and then gzlog_open() again. */
-int gzlog_write(void *log, char *data, size_t len);
-
-/* Close a gzlog object. Return non-zero on error. The log file is locked
- until this function is called. This function will compress stored data
- at the end of the gzip file if at least 1 MB has been accumulated. Note
- that the file will not be a valid gzip file until this function completes.
- */
-int gzlog_close(void *log);