71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* compress_io.h
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* Interface to compress_io.c routines
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*
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* Portions Copyright (c) 1996-2020, 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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* IDENTIFICATION
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* src/bin/pg_dump/compress_io.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef __COMPRESS_IO__
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#define __COMPRESS_IO__
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#include "pg_backup_archiver.h"
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/* Initial buffer sizes used in zlib compression. */
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#define ZLIB_OUT_SIZE 4096
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#define ZLIB_IN_SIZE 4096
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typedef enum
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{
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COMPR_ALG_NONE,
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COMPR_ALG_LIBZ
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} CompressionAlgorithm;
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/* Prototype for callback function to WriteDataToArchive() */
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typedef void (*WriteFunc) (ArchiveHandle *AH, const char *buf, size_t len);
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/*
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* Prototype for callback function to ReadDataFromArchive()
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*
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* ReadDataFromArchive will call the read function repeatedly, until it
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* returns 0 to signal EOF. ReadDataFromArchive passes a buffer to read the
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* data into in *buf, of length *buflen. If that's not big enough for the
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* callback function, it can free() it and malloc() a new one, returning the
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* new buffer and its size in *buf and *buflen.
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*
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* Returns the number of bytes read into *buf, or 0 on EOF.
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*/
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typedef size_t (*ReadFunc) (ArchiveHandle *AH, char **buf, size_t *buflen);
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/* struct definition appears in compress_io.c */
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typedef struct CompressorState CompressorState;
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extern CompressorState *AllocateCompressor(int compression, WriteFunc writeF);
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extern void ReadDataFromArchive(ArchiveHandle *AH, int compression,
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ReadFunc readF);
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extern void WriteDataToArchive(ArchiveHandle *AH, CompressorState *cs,
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const void *data, size_t dLen);
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extern void EndCompressor(ArchiveHandle *AH, CompressorState *cs);
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typedef struct cfp cfp;
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extern cfp *cfopen(const char *path, const char *mode, int compression);
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extern cfp *cfopen_read(const char *path, const char *mode);
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extern cfp *cfopen_write(const char *path, const char *mode, int compression);
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extern int cfread(void *ptr, int size, cfp *fp);
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extern int cfwrite(const void *ptr, int size, cfp *fp);
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extern int cfgetc(cfp *fp);
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extern char *cfgets(cfp *fp, char *buf, int len);
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extern int cfclose(cfp *fp);
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extern int cfeof(cfp *fp);
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extern const char *get_cfp_error(cfp *fp);
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#endif
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