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/**************************************************************/
/* tpax: a topological pax implementation */
/* Copyright (C) 2020--2024 SysDeer Technologies, LLC */
/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */
/**************************************************************/
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <tpax/tpax.h>
#include <tpax/tpax_specs.h>
#include "tpax_driver_impl.h"
#include "tpax_errinfo_impl.h"
static int tpax_io_seek_fileio(
struct tpax_driver_ctx * dctx,
off_t offset,
int whence)
{
int fdin;
fdin = tpax_driver_fdin(dctx);
if ((offset = lseek(fdin,offset,whence)) < 0)
return TPAX_SYSTEM_ERROR(dctx);
tpax_set_driver_cpos(dctx,offset);
return 0;
}
static int tpax_io_seek_mapped(
struct tpax_driver_ctx * dctx,
off_t offset,
int whence)
{
struct tpax_driver_ctx_impl * ictx;
size_t aoffset;
ictx = tpax_get_driver_ictx(dctx);
if (whence == SEEK_CUR) {
offset += tpax_get_driver_cpos(dctx);
} else if (whence == SEEK_END) {
offset += ictx->mapsize;
}
if ((offset < 0) || ((aoffset = offset) > ictx->mapsize))
return TPAX_CUSTOM_ERROR(
dctx,
TPAX_ERR_FLOW_ERROR);
tpax_set_driver_cpos(dctx,offset);
return 0;
}
int tpax_io_seek(struct tpax_driver_ctx * dctx, off_t offset, int whence)
{
switch (whence) {
case SEEK_SET:
case SEEK_CUR:
case SEEK_END:
break;
default:
return TPAX_CUSTOM_ERROR(
dctx,
TPAX_ERR_FLOW_ERROR);
}
if (dctx->cctx->srcflags & TPAX_SOURCE_DATA_FILEIO) {
return tpax_io_seek_fileio(dctx,offset,whence);
} else if (dctx->cctx->srcflags & TPAX_SOURCE_DATA_MAPPED) {
return tpax_io_seek_mapped(dctx,offset,whence);
}
return TPAX_CUSTOM_ERROR(
dctx,
TPAX_ERR_FLOW_ERROR);
}
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