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/*-------------------------------------------------------------------------
*
* compress_none.c
* Routines for archivers to read or write an uncompressed stream.
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/bin/pg_dump/compress_none.c
*
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include <unistd.h>
#include "compress_none.h"
#include "pg_backup_utils.h"
/*----------------------
* Compressor API
*----------------------
*/
/*
* Private routines
*/
static void
ReadDataFromArchiveNone(ArchiveHandle *AH, CompressorState *cs)
{
size_t cnt;
char *buf;
size_t buflen;
buflen = DEFAULT_IO_BUFFER_SIZE;
buf = pg_malloc(buflen);
while ((cnt = cs->readF(AH, &buf, &buflen)))
{
ahwrite(buf, 1, cnt, AH);
}
free(buf);
}
static void
WriteDataToArchiveNone(ArchiveHandle *AH, CompressorState *cs,
const void *data, size_t dLen)
{
cs->writeF(AH, data, dLen);
}
static void
EndCompressorNone(ArchiveHandle *AH, CompressorState *cs)
{
/* no op */
}
/*
* Public interface
*/
void
InitCompressorNone(CompressorState *cs,
const pg_compress_specification compression_spec)
{
cs->readData = ReadDataFromArchiveNone;
cs->writeData = WriteDataToArchiveNone;
cs->end = EndCompressorNone;
cs->compression_spec = compression_spec;
}
/*----------------------
* Compress File API
*----------------------
*/
/*
* Private routines
*/
static bool
read_none(void *ptr, size_t size, size_t *rsize, CompressFileHandle *CFH)
{
FILE *fp = (FILE *) CFH->private_data;
size_t ret;
if (size == 0)
return true;
ret = fread(ptr, 1, size, fp);
if (ret != size && !feof(fp))
pg_fatal("could not read from input file: %s",
strerror(errno));
if (rsize)
*rsize = ret;
return true;
}
static bool
write_none(const void *ptr, size_t size, CompressFileHandle *CFH)
{
size_t ret;
ret = fwrite(ptr, 1, size, (FILE *) CFH->private_data);
if (ret != size)
return false;
return true;
}
static const char *
get_error_none(CompressFileHandle *CFH)
{
return strerror(errno);
}
static char *
gets_none(char *ptr, int size, CompressFileHandle *CFH)
{
return fgets(ptr, size, (FILE *) CFH->private_data);
}
static int
getc_none(CompressFileHandle *CFH)
{
FILE *fp = (FILE *) CFH->private_data;
int ret;
ret = fgetc(fp);
if (ret == EOF)
{
if (!feof(fp))
pg_fatal("could not read from input file: %s", strerror(errno));
else
pg_fatal("could not read from input file: end of file");
}
return ret;
}
static bool
close_none(CompressFileHandle *CFH)
{
FILE *fp = (FILE *) CFH->private_data;
int ret = 0;
CFH->private_data = NULL;
if (fp)
ret = fclose(fp);
return ret == 0;
}
static bool
eof_none(CompressFileHandle *CFH)
{
return feof((FILE *) CFH->private_data) != 0;
}
static bool
open_none(const char *path, int fd, const char *mode, CompressFileHandle *CFH)
{
Assert(CFH->private_data == NULL);
if (fd >= 0)
CFH->private_data = fdopen(dup(fd), mode);
else
CFH->private_data = fopen(path, mode);
if (CFH->private_data == NULL)
return false;
return true;
}
static bool
open_write_none(const char *path, const char *mode, CompressFileHandle *CFH)
{
Assert(CFH->private_data == NULL);
CFH->private_data = fopen(path, mode);
if (CFH->private_data == NULL)
return false;
return true;
}
/*
* Public interface
*/
void
InitCompressFileHandleNone(CompressFileHandle *CFH,
const pg_compress_specification compression_spec)
{
CFH->open_func = open_none;
CFH->open_write_func = open_write_none;
CFH->read_func = read_none;
CFH->write_func = write_none;
CFH->gets_func = gets_none;
CFH->getc_func = getc_none;
CFH->close_func = close_none;
CFH->eof_func = eof_none;
CFH->get_error_func = get_error_none;
CFH->private_data = NULL;
}
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