C gzopen archive#

00205 */ 00206 void 00207 EndCompressor( ArchiveHandle *AH, CompressorState *cs)Д 0209 #ifdef HAVE_LIBZ 00210 if (cs-> comprAlg = COMPR_ALG_LIBZ)Д 0216 /* Private routines, specific to each compression method. This allows you to easily handle both 00047 * compressed and uncompressed files. cfopen_write() opens a file for writing, an 00045 * extra argument specifies if the file should be compressed, and adds the 00046 *. cfopen_read() first tries to open 00043 * the file with given name, and if it fails, it tries to open the same 00044 * file with the. It allows you to use the same functions for 00042 * compressed and uncompressed streams. 00036 * 00037 * Compressed stream API 00038 * - 00039 * 00040 * The compressed stream API is a wrapper around the C standard fopen() and 00041 * libz's gzopen() APIs. 00034 * 00035 * The interface is the same for compressed and uncompressed streams. ReadFunc returns the 00031 * compressed data chunk at a time, and ReadDataFromArchive decompresses it 00032 * and passes the decompressed data to ahwrite(), until ReadFunc returns 0 00033 * to signal EOF. ReadDataFromArchive reads the whole compressed input 00030 * stream, by repeatedly calling the given ReadFunc.

C gzopen archive#

00027 * 00028 * The interface for reading an archive consists of just one function: 00029 * ReadDataFromArchive. WriteDataToArchive 00025 * and EndCompressor will call the WriteFunc that was provided to 00026 * AllocateCompressor for each chunk of compressed data. First you call 00023 * AllocateCompressor, then write all the data by calling WriteDataToArchive 00024 * as many times as needed, and finally EndCompressor. 00017 * 00018 * Compressor API 00019 * - 00020 * 00021 * The interface for writing to an archive consists of three functions: 00022 * AllocateCompressor, WriteDataToArchive and EndCompressor. Both APIs use libz for the compression, but 00015 * the second API uses gzip headers, so the resulting files can be easily 00016 * manipulated with the gzip utility. The second API is a wrapper around fopen/gzopen and 00013 * friends, providing an interface similar to those, but abstracts away 00014 * the possible compression. The first 00011 * provides more flexibility, using callbacks to read/write data from the 00012 * underlying stream. 00006 * 00007 * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group 00008 * Portions Copyright (c) 1994, Regents of the University of California 00009 * 00010 * This file includes two APIs for dealing with compressed data. 00001 /*- 00002 * 00003 * compress_io.c 00004 * Routines for archivers to write an uncompressed or compressed data 00005 * stream.