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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"
#define TPAX_IO_READ_MAX (2147483647)
static int tpax_io_range_read_next_fileio(
struct tpax_driver_ctx * dctx,
void * buf,
size_t size)
{
int fdin;
ssize_t nbytes;
off_t cpos;
fdin = tpax_driver_fdin(dctx);
nbytes = read(fdin,buf,size);
while ((nbytes < 0) && (errno = EINTR))
nbytes = read(fdin,buf,size);
if (nbytes > 0) {
cpos = tpax_get_driver_cpos(dctx);
tpax_set_driver_cpos(dctx,cpos + nbytes);
}
return nbytes;
}
static int tpax_io_range_read_next_mapped(
struct tpax_driver_ctx * dctx,
void * buf,
size_t size)
{
struct tpax_driver_ctx_impl * ictx;
char * ch;
off_t cpos;
ictx = tpax_get_driver_ictx(dctx);
cpos = tpax_get_driver_cpos(dctx);
size = (cpos + size <= ictx->mapsize) ? size : ictx->mapsize - cpos;
ch = ictx->mapaddr;
ch = &ch[cpos];
memcpy(buf,ch,size);
tpax_set_driver_cpos(dctx,cpos + size);
return size;
}
int tpax_io_range_read_next(struct tpax_driver_ctx * dctx, void * buf, size_t size)
{
size = (size <= TPAX_IO_READ_MAX) ? size : TPAX_IO_READ_MAX;
if (dctx->cctx->srcflags & TPAX_SOURCE_DATA_FILEIO) {
return tpax_io_range_read_next_fileio(dctx,buf,size);
} else if (dctx->cctx->srcflags & TPAX_SOURCE_DATA_MAPPED) {
return tpax_io_range_read_next_mapped(dctx,buf,size);
}
return TPAX_CUSTOM_ERROR(
dctx,
TPAX_ERR_FLOW_ERROR);
}
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