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/*
* Copyright (C) 2011-2014 Codethink Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License Version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdbool.h>
#include <endian.h>
#include <unistd.h>
#include <assert.h>
#include "tbdiff-stat.h"
#if __STDC_VERSION__ >= 199901L
#define RESTRICT restrict
#elif defined(__GNUC__)
#define RESTRICT __restrict__
#else
#define RESTRICT
#endif
#if __BYTE_ORDER == __BIG_ENDIAN
static inline void byteswap(char *RESTRICT a, char *RESTRICT b)
{
char swap = *a;
*a = *b;
*b = swap;
}
/*inverts the indices of an array of bytes. */
static inline void endianswap(void* value, size_t size)
{
char* cvalue = value;
int i, j;
for (i = 0, j = (size - 1); i < (size / 2); i++, j--)
byteswap(&cvalue[i], &cvalue[j]);
}
#define ENDIANSWAP(v) endianswap(v, sizeof(*v))
#else
#define ENDIANSWAP(v)
#endif
bool tbd_write_uint16(uint16_t value, int stream) {
ENDIANSWAP(&value);
return (write(stream, &value, sizeof(value)) == sizeof(value));
}
bool tbd_write_uint32(uint32_t value, int stream) {
ENDIANSWAP(&value);
return (write(stream, &value, sizeof(value)) == sizeof(value));
}
bool tbd_write_uint64(uint64_t value, int stream) {
ENDIANSWAP(&value);
return (write(stream, &value, sizeof(value)) == sizeof(value));
}
bool tbd_write_time(time_t value, int stream) {
uint64_t realv = value;
ENDIANSWAP(&realv);
return (write(stream, &realv, sizeof(realv)) == sizeof(value));
}
bool tbd_write_mode(mode_t value, int stream) {
ENDIANSWAP(&value);
return (write(stream, &value, sizeof(value)) == sizeof(value));
}
bool tbd_write_uid(uid_t value, int stream) {
ENDIANSWAP(&value);
return (write(stream, &value, sizeof(value)) == sizeof(value));
}
bool tbd_write_gid(gid_t value, int stream) {
ENDIANSWAP(&value);
return (write(stream, &value, sizeof(value)) == sizeof(value));
}
size_t tbd_read_uint16(uint16_t *value, FILE *stream) {
assert(value != NULL);
size_t rval = fread(value, sizeof(*value), 1, stream);
ENDIANSWAP(value);
return rval;
}
size_t tbd_read_uint32(uint32_t *value, FILE *stream) {
assert(value != NULL);
size_t rval = fread(value, sizeof(*value), 1, stream);
ENDIANSWAP(value);
return rval;
}
size_t tbd_read_uint64(uint64_t *value, FILE *stream) {
assert(value != NULL);
size_t rval = fread(value, sizeof(*value), 1, stream);
ENDIANSWAP(value);
return rval;
}
size_t tbd_read_time(time_t *value, FILE *stream) {
assert(value != NULL);
uint64_t realv;
size_t rval = fread(&realv, sizeof(realv), 1, stream);
ENDIANSWAP(&realv);
*value = realv;
return rval;
}
size_t tbd_read_mode(mode_t *value, FILE *stream) {
assert(value != NULL);
size_t rval = fread(value, sizeof(*value), 1, stream);
ENDIANSWAP(value);
return rval;
}
size_t tbd_read_uid(uid_t *value, FILE *stream) {
assert(value != NULL);
size_t rval = fread(value, sizeof(*value), 1, stream);
ENDIANSWAP(value);
return rval;
}
size_t tbd_read_gid(gid_t *value, FILE *stream) {
assert(value != NULL);
size_t rval = fread(value, sizeof(*value), 1, stream);
ENDIANSWAP(value);
return rval;
}
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