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0e7e355f27
cfopen() and cfopen_write() failed to pass the compression level through to zlib, so that you always got the default compression level if you got any at all. In passing, also fix these and related functions so that the correct errno is reliably returned on failure; the original coding supposes that free() cannot change errno, which is untrue on at least some platforms. Per bug #12779 from Christoph Berg. Back-patch to 9.1 where the faulty code was introduced. Michael Paquier
714 lines
16 KiB
C
714 lines
16 KiB
C
/*-------------------------------------------------------------------------
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*
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* compress_io.c
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* Routines for archivers to write an uncompressed or compressed data
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* stream.
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*
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* Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* This file includes two APIs for dealing with compressed data. The first
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* provides more flexibility, using callbacks to read/write data from the
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* underlying stream. The second API is a wrapper around fopen/gzopen and
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* friends, providing an interface similar to those, but abstracts away
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* the possible compression. Both APIs use libz for the compression, but
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* the second API uses gzip headers, so the resulting files can be easily
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* manipulated with the gzip utility.
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*
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* Compressor API
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* --------------
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*
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* The interface for writing to an archive consists of three functions:
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* AllocateCompressor, WriteDataToArchive and EndCompressor. First you call
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* AllocateCompressor, then write all the data by calling WriteDataToArchive
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* as many times as needed, and finally EndCompressor. WriteDataToArchive
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* and EndCompressor will call the WriteFunc that was provided to
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* AllocateCompressor for each chunk of compressed data.
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*
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* The interface for reading an archive consists of just one function:
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* ReadDataFromArchive. ReadDataFromArchive reads the whole compressed input
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* stream, by repeatedly calling the given ReadFunc. ReadFunc returns the
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* compressed data chunk at a time, and ReadDataFromArchive decompresses it
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* and passes the decompressed data to ahwrite(), until ReadFunc returns 0
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* to signal EOF.
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*
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* The interface is the same for compressed and uncompressed streams.
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*
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* Compressed stream API
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* ----------------------
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*
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* The compressed stream API is a wrapper around the C standard fopen() and
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* libz's gzopen() APIs. It allows you to use the same functions for
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* compressed and uncompressed streams. cfopen_read() first tries to open
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* the file with given name, and if it fails, it tries to open the same
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* file with the .gz suffix. cfopen_write() opens a file for writing, an
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* extra argument specifies if the file should be compressed, and adds the
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* .gz suffix to the filename if so. This allows you to easily handle both
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* compressed and uncompressed files.
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*
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* IDENTIFICATION
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* src/bin/pg_dump/compress_io.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres_fe.h"
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#include "compress_io.h"
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#include "parallel.h"
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#include "pg_backup_utils.h"
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/*----------------------
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* Compressor API
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*----------------------
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*/
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/* typedef appears in compress_io.h */
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struct CompressorState
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{
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CompressionAlgorithm comprAlg;
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WriteFunc writeF;
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#ifdef HAVE_LIBZ
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z_streamp zp;
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char *zlibOut;
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size_t zlibOutSize;
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#endif
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};
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/* translator: this is a module name */
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static const char *modulename = gettext_noop("compress_io");
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static void ParseCompressionOption(int compression, CompressionAlgorithm *alg,
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int *level);
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/* Routines that support zlib compressed data I/O */
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#ifdef HAVE_LIBZ
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static void InitCompressorZlib(CompressorState *cs, int level);
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static void DeflateCompressorZlib(ArchiveHandle *AH, CompressorState *cs,
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bool flush);
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static void ReadDataFromArchiveZlib(ArchiveHandle *AH, ReadFunc readF);
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static void WriteDataToArchiveZlib(ArchiveHandle *AH, CompressorState *cs,
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const char *data, size_t dLen);
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static void EndCompressorZlib(ArchiveHandle *AH, CompressorState *cs);
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#endif
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/* Routines that support uncompressed data I/O */
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static void ReadDataFromArchiveNone(ArchiveHandle *AH, ReadFunc readF);
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static void WriteDataToArchiveNone(ArchiveHandle *AH, CompressorState *cs,
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const char *data, size_t dLen);
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/*
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* Interprets a numeric 'compression' value. The algorithm implied by the
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* value (zlib or none at the moment), is returned in *alg, and the
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* zlib compression level in *level.
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*/
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static void
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ParseCompressionOption(int compression, CompressionAlgorithm *alg, int *level)
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{
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if (compression == Z_DEFAULT_COMPRESSION ||
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(compression > 0 && compression <= 9))
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*alg = COMPR_ALG_LIBZ;
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else if (compression == 0)
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*alg = COMPR_ALG_NONE;
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else
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{
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exit_horribly(modulename, "invalid compression code: %d\n",
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compression);
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*alg = COMPR_ALG_NONE; /* keep compiler quiet */
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}
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/* The level is just the passed-in value. */
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if (level)
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*level = compression;
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}
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/* Public interface routines */
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/* Allocate a new compressor */
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CompressorState *
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AllocateCompressor(int compression, WriteFunc writeF)
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{
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CompressorState *cs;
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CompressionAlgorithm alg;
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int level;
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ParseCompressionOption(compression, &alg, &level);
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#ifndef HAVE_LIBZ
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if (alg == COMPR_ALG_LIBZ)
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exit_horribly(modulename, "not built with zlib support\n");
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#endif
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cs = (CompressorState *) pg_malloc0(sizeof(CompressorState));
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cs->writeF = writeF;
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cs->comprAlg = alg;
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/*
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* Perform compression algorithm specific initialization.
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*/
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#ifdef HAVE_LIBZ
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if (alg == COMPR_ALG_LIBZ)
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InitCompressorZlib(cs, level);
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#endif
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return cs;
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}
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/*
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* Read all compressed data from the input stream (via readF) and print it
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* out with ahwrite().
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*/
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void
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ReadDataFromArchive(ArchiveHandle *AH, int compression, ReadFunc readF)
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{
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CompressionAlgorithm alg;
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ParseCompressionOption(compression, &alg, NULL);
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if (alg == COMPR_ALG_NONE)
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ReadDataFromArchiveNone(AH, readF);
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if (alg == COMPR_ALG_LIBZ)
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{
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#ifdef HAVE_LIBZ
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ReadDataFromArchiveZlib(AH, readF);
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#else
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exit_horribly(modulename, "not built with zlib support\n");
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#endif
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}
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}
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/*
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* Compress and write data to the output stream (via writeF).
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*/
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void
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WriteDataToArchive(ArchiveHandle *AH, CompressorState *cs,
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const void *data, size_t dLen)
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{
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/* Are we aborting? */
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checkAborting(AH);
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switch (cs->comprAlg)
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{
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case COMPR_ALG_LIBZ:
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#ifdef HAVE_LIBZ
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WriteDataToArchiveZlib(AH, cs, data, dLen);
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#else
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exit_horribly(modulename, "not built with zlib support\n");
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#endif
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break;
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case COMPR_ALG_NONE:
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WriteDataToArchiveNone(AH, cs, data, dLen);
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break;
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}
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return;
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}
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/*
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* Terminate compression library context and flush its buffers.
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*/
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void
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EndCompressor(ArchiveHandle *AH, CompressorState *cs)
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{
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#ifdef HAVE_LIBZ
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if (cs->comprAlg == COMPR_ALG_LIBZ)
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EndCompressorZlib(AH, cs);
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#endif
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free(cs);
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}
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/* Private routines, specific to each compression method. */
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#ifdef HAVE_LIBZ
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/*
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* Functions for zlib compressed output.
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*/
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static void
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InitCompressorZlib(CompressorState *cs, int level)
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{
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z_streamp zp;
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zp = cs->zp = (z_streamp) pg_malloc(sizeof(z_stream));
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zp->zalloc = Z_NULL;
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zp->zfree = Z_NULL;
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zp->opaque = Z_NULL;
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/*
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* zlibOutSize is the buffer size we tell zlib it can output to. We
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* actually allocate one extra byte because some routines want to append a
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* trailing zero byte to the zlib output.
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*/
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cs->zlibOut = (char *) pg_malloc(ZLIB_OUT_SIZE + 1);
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cs->zlibOutSize = ZLIB_OUT_SIZE;
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if (deflateInit(zp, level) != Z_OK)
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exit_horribly(modulename,
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"could not initialize compression library: %s\n",
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zp->msg);
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/* Just be paranoid - maybe End is called after Start, with no Write */
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zp->next_out = (void *) cs->zlibOut;
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zp->avail_out = cs->zlibOutSize;
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}
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static void
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EndCompressorZlib(ArchiveHandle *AH, CompressorState *cs)
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{
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z_streamp zp = cs->zp;
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zp->next_in = NULL;
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zp->avail_in = 0;
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/* Flush any remaining data from zlib buffer */
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DeflateCompressorZlib(AH, cs, true);
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if (deflateEnd(zp) != Z_OK)
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exit_horribly(modulename,
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"could not close compression stream: %s\n", zp->msg);
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free(cs->zlibOut);
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free(cs->zp);
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}
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static void
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DeflateCompressorZlib(ArchiveHandle *AH, CompressorState *cs, bool flush)
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{
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z_streamp zp = cs->zp;
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char *out = cs->zlibOut;
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int res = Z_OK;
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while (cs->zp->avail_in != 0 || flush)
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{
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res = deflate(zp, flush ? Z_FINISH : Z_NO_FLUSH);
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if (res == Z_STREAM_ERROR)
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exit_horribly(modulename,
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"could not compress data: %s\n", zp->msg);
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if ((flush && (zp->avail_out < cs->zlibOutSize))
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|| (zp->avail_out == 0)
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|| (zp->avail_in != 0)
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)
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{
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/*
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* Extra paranoia: avoid zero-length chunks, since a zero length
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* chunk is the EOF marker in the custom format. This should never
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* happen but...
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*/
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if (zp->avail_out < cs->zlibOutSize)
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{
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/*
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* Any write function shoud do its own error checking but to
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* make sure we do a check here as well...
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*/
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size_t len = cs->zlibOutSize - zp->avail_out;
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cs->writeF(AH, out, len);
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}
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zp->next_out = (void *) out;
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zp->avail_out = cs->zlibOutSize;
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}
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if (res == Z_STREAM_END)
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break;
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}
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}
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static void
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WriteDataToArchiveZlib(ArchiveHandle *AH, CompressorState *cs,
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const char *data, size_t dLen)
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{
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cs->zp->next_in = (void *) data;
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cs->zp->avail_in = dLen;
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DeflateCompressorZlib(AH, cs, false);
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return;
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}
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static void
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ReadDataFromArchiveZlib(ArchiveHandle *AH, ReadFunc readF)
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{
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z_streamp zp;
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char *out;
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int res = Z_OK;
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size_t cnt;
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char *buf;
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size_t buflen;
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zp = (z_streamp) pg_malloc(sizeof(z_stream));
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zp->zalloc = Z_NULL;
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zp->zfree = Z_NULL;
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zp->opaque = Z_NULL;
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buf = pg_malloc(ZLIB_IN_SIZE);
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buflen = ZLIB_IN_SIZE;
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out = pg_malloc(ZLIB_OUT_SIZE + 1);
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if (inflateInit(zp) != Z_OK)
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exit_horribly(modulename,
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"could not initialize compression library: %s\n",
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zp->msg);
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/* no minimal chunk size for zlib */
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while ((cnt = readF(AH, &buf, &buflen)))
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{
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/* Are we aborting? */
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checkAborting(AH);
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zp->next_in = (void *) buf;
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zp->avail_in = cnt;
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while (zp->avail_in > 0)
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{
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zp->next_out = (void *) out;
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zp->avail_out = ZLIB_OUT_SIZE;
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res = inflate(zp, 0);
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if (res != Z_OK && res != Z_STREAM_END)
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exit_horribly(modulename,
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"could not uncompress data: %s\n", zp->msg);
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out[ZLIB_OUT_SIZE - zp->avail_out] = '\0';
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ahwrite(out, 1, ZLIB_OUT_SIZE - zp->avail_out, AH);
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}
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}
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zp->next_in = NULL;
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zp->avail_in = 0;
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while (res != Z_STREAM_END)
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{
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zp->next_out = (void *) out;
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zp->avail_out = ZLIB_OUT_SIZE;
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res = inflate(zp, 0);
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if (res != Z_OK && res != Z_STREAM_END)
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exit_horribly(modulename,
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"could not uncompress data: %s\n", zp->msg);
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out[ZLIB_OUT_SIZE - zp->avail_out] = '\0';
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ahwrite(out, 1, ZLIB_OUT_SIZE - zp->avail_out, AH);
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}
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if (inflateEnd(zp) != Z_OK)
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exit_horribly(modulename,
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"could not close compression library: %s\n", zp->msg);
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free(buf);
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free(out);
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free(zp);
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}
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#endif /* HAVE_LIBZ */
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/*
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* Functions for uncompressed output.
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*/
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static void
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ReadDataFromArchiveNone(ArchiveHandle *AH, ReadFunc readF)
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{
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size_t cnt;
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char *buf;
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size_t buflen;
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buf = pg_malloc(ZLIB_OUT_SIZE);
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buflen = ZLIB_OUT_SIZE;
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while ((cnt = readF(AH, &buf, &buflen)))
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{
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/* Are we aborting? */
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checkAborting(AH);
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ahwrite(buf, 1, cnt, AH);
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}
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free(buf);
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}
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static void
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WriteDataToArchiveNone(ArchiveHandle *AH, CompressorState *cs,
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const char *data, size_t dLen)
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{
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cs->writeF(AH, data, dLen);
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return;
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}
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/*----------------------
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* Compressed stream API
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*----------------------
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*/
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/*
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* cfp represents an open stream, wrapping the underlying FILE or gzFile
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* pointer. This is opaque to the callers.
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*/
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struct cfp
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{
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FILE *uncompressedfp;
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#ifdef HAVE_LIBZ
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gzFile compressedfp;
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#endif
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};
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#ifdef HAVE_LIBZ
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static int hasSuffix(const char *filename, const char *suffix);
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#endif
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/* free() without changing errno; useful in several places below */
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static void
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free_keep_errno(void *p)
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{
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int save_errno = errno;
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free(p);
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errno = save_errno;
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}
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/*
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* Open a file for reading. 'path' is the file to open, and 'mode' should
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* be either "r" or "rb".
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*
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* If the file at 'path' does not exist, we append the ".gz" suffix (if 'path'
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* doesn't already have it) and try again. So if you pass "foo" as 'path',
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* this will open either "foo" or "foo.gz".
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*
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* On failure, return NULL with an error code in errno.
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*/
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cfp *
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cfopen_read(const char *path, const char *mode)
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{
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cfp *fp;
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#ifdef HAVE_LIBZ
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if (hasSuffix(path, ".gz"))
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fp = cfopen(path, mode, 1);
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else
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#endif
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{
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fp = cfopen(path, mode, 0);
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#ifdef HAVE_LIBZ
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if (fp == NULL)
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{
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char *fname;
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fname = psprintf("%s.gz", path);
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fp = cfopen(fname, mode, 1);
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free_keep_errno(fname);
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}
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#endif
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}
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return fp;
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}
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/*
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* Open a file for writing. 'path' indicates the path name, and 'mode' must
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* be a filemode as accepted by fopen() and gzopen() that indicates writing
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* ("w", "wb", "a", or "ab").
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*
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* If 'compression' is non-zero, a gzip compressed stream is opened, and
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* 'compression' indicates the compression level used. The ".gz" suffix
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* is automatically added to 'path' in that case.
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*
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* On failure, return NULL with an error code in errno.
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*/
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cfp *
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cfopen_write(const char *path, const char *mode, int compression)
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{
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cfp *fp;
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if (compression == 0)
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fp = cfopen(path, mode, 0);
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else
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{
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#ifdef HAVE_LIBZ
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char *fname;
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fname = psprintf("%s.gz", path);
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fp = cfopen(fname, mode, compression);
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free_keep_errno(fname);
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#else
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exit_horribly(modulename, "not built with zlib support\n");
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fp = NULL; /* keep compiler quiet */
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#endif
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}
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return fp;
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}
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/*
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* Opens file 'path' in 'mode'. If 'compression' is non-zero, the file
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* is opened with libz gzopen(), otherwise with plain fopen().
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*
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* On failure, return NULL with an error code in errno.
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*/
|
|
cfp *
|
|
cfopen(const char *path, const char *mode, int compression)
|
|
{
|
|
cfp *fp = pg_malloc(sizeof(cfp));
|
|
|
|
if (compression != 0)
|
|
{
|
|
#ifdef HAVE_LIBZ
|
|
char mode_compression[32];
|
|
|
|
snprintf(mode_compression, sizeof(mode_compression), "%s%d",
|
|
mode, compression);
|
|
fp->compressedfp = gzopen(path, mode_compression);
|
|
fp->uncompressedfp = NULL;
|
|
if (fp->compressedfp == NULL)
|
|
{
|
|
free_keep_errno(fp);
|
|
fp = NULL;
|
|
}
|
|
#else
|
|
exit_horribly(modulename, "not built with zlib support\n");
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
#ifdef HAVE_LIBZ
|
|
fp->compressedfp = NULL;
|
|
#endif
|
|
fp->uncompressedfp = fopen(path, mode);
|
|
if (fp->uncompressedfp == NULL)
|
|
{
|
|
free_keep_errno(fp);
|
|
fp = NULL;
|
|
}
|
|
}
|
|
|
|
return fp;
|
|
}
|
|
|
|
|
|
int
|
|
cfread(void *ptr, int size, cfp *fp)
|
|
{
|
|
int ret;
|
|
|
|
if (size == 0)
|
|
return 0;
|
|
|
|
#ifdef HAVE_LIBZ
|
|
if (fp->compressedfp)
|
|
{
|
|
ret = gzread(fp->compressedfp, ptr, size);
|
|
if (ret != size && !gzeof(fp->compressedfp))
|
|
exit_horribly(modulename,
|
|
"could not read from input file: %s\n", strerror(errno));
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
ret = fread(ptr, 1, size, fp->uncompressedfp);
|
|
if (ret != size && !feof(fp->uncompressedfp))
|
|
READ_ERROR_EXIT(fp->uncompressedfp);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
cfwrite(const void *ptr, int size, cfp *fp)
|
|
{
|
|
#ifdef HAVE_LIBZ
|
|
if (fp->compressedfp)
|
|
return gzwrite(fp->compressedfp, ptr, size);
|
|
else
|
|
#endif
|
|
return fwrite(ptr, 1, size, fp->uncompressedfp);
|
|
}
|
|
|
|
int
|
|
cfgetc(cfp *fp)
|
|
{
|
|
int ret;
|
|
|
|
#ifdef HAVE_LIBZ
|
|
if (fp->compressedfp)
|
|
{
|
|
ret = gzgetc(fp->compressedfp);
|
|
if (ret == EOF)
|
|
{
|
|
if (!gzeof(fp->compressedfp))
|
|
exit_horribly(modulename,
|
|
"could not read from input file: %s\n", strerror(errno));
|
|
else
|
|
exit_horribly(modulename,
|
|
"could not read from input file: end of file\n");
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
ret = fgetc(fp->uncompressedfp);
|
|
if (ret == EOF)
|
|
READ_ERROR_EXIT(fp->uncompressedfp);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
char *
|
|
cfgets(cfp *fp, char *buf, int len)
|
|
{
|
|
#ifdef HAVE_LIBZ
|
|
if (fp->compressedfp)
|
|
return gzgets(fp->compressedfp, buf, len);
|
|
else
|
|
#endif
|
|
return fgets(buf, len, fp->uncompressedfp);
|
|
}
|
|
|
|
int
|
|
cfclose(cfp *fp)
|
|
{
|
|
int result;
|
|
|
|
if (fp == NULL)
|
|
{
|
|
errno = EBADF;
|
|
return EOF;
|
|
}
|
|
#ifdef HAVE_LIBZ
|
|
if (fp->compressedfp)
|
|
{
|
|
result = gzclose(fp->compressedfp);
|
|
fp->compressedfp = NULL;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
result = fclose(fp->uncompressedfp);
|
|
fp->uncompressedfp = NULL;
|
|
}
|
|
free_keep_errno(fp);
|
|
|
|
return result;
|
|
}
|
|
|
|
int
|
|
cfeof(cfp *fp)
|
|
{
|
|
#ifdef HAVE_LIBZ
|
|
if (fp->compressedfp)
|
|
return gzeof(fp->compressedfp);
|
|
else
|
|
#endif
|
|
return feof(fp->uncompressedfp);
|
|
}
|
|
|
|
#ifdef HAVE_LIBZ
|
|
static int
|
|
hasSuffix(const char *filename, const char *suffix)
|
|
{
|
|
int filenamelen = strlen(filename);
|
|
int suffixlen = strlen(suffix);
|
|
|
|
if (filenamelen < suffixlen)
|
|
return 0;
|
|
|
|
return memcmp(&filename[filenamelen - suffixlen],
|
|
suffix,
|
|
suffixlen) == 0;
|
|
}
|
|
|
|
#endif
|