mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-28 05:50:37 +00:00
1324f06384
Currently qemu_uuid_bswap() takes a pointer to the QemuUUID to be byte-swapped. This means it can't be used when the UUID to be swapped is in a packed member of a struct. It's also out of line with the general bswap*() functions we provide in bswap.h, which take the value to be swapped and return it. Make qemu_uuid_bswap() take a QemuUUID and return the swapped version. This fixes some clang warnings about taking the address of a packed struct member in block/vdi.c. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
/*
|
|
* QEMU UUID functions
|
|
*
|
|
* Copyright 2016 Red Hat, Inc.
|
|
*
|
|
* Authors:
|
|
* Fam Zheng <famz@redhat.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qemu-common.h"
|
|
#include "qemu/uuid.h"
|
|
#include "qemu/bswap.h"
|
|
|
|
void qemu_uuid_generate(QemuUUID *uuid)
|
|
{
|
|
int i;
|
|
uint32_t tmp[4];
|
|
|
|
QEMU_BUILD_BUG_ON(sizeof(QemuUUID) != 16);
|
|
|
|
for (i = 0; i < 4; ++i) {
|
|
tmp[i] = g_random_int();
|
|
}
|
|
memcpy(uuid, tmp, sizeof(tmp));
|
|
/* Set the two most significant bits (bits 6 and 7) of the
|
|
clock_seq_hi_and_reserved to zero and one, respectively. */
|
|
uuid->data[8] = (uuid->data[8] & 0x3f) | 0x80;
|
|
/* Set the four most significant bits (bits 12 through 15) of the
|
|
time_hi_and_version field to the 4-bit version number.
|
|
*/
|
|
uuid->data[6] = (uuid->data[6] & 0xf) | 0x40;
|
|
}
|
|
|
|
int qemu_uuid_is_null(const QemuUUID *uu)
|
|
{
|
|
static QemuUUID null_uuid;
|
|
return qemu_uuid_is_equal(uu, &null_uuid);
|
|
}
|
|
|
|
int qemu_uuid_is_equal(const QemuUUID *lhv, const QemuUUID *rhv)
|
|
{
|
|
return memcmp(lhv, rhv, sizeof(QemuUUID)) == 0;
|
|
}
|
|
|
|
void qemu_uuid_unparse(const QemuUUID *uuid, char *out)
|
|
{
|
|
const unsigned char *uu = &uuid->data[0];
|
|
snprintf(out, UUID_FMT_LEN + 1, UUID_FMT,
|
|
uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7],
|
|
uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
|
|
}
|
|
|
|
char *qemu_uuid_unparse_strdup(const QemuUUID *uuid)
|
|
{
|
|
const unsigned char *uu = &uuid->data[0];
|
|
return g_strdup_printf(UUID_FMT,
|
|
uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6],
|
|
uu[7], uu[8], uu[9], uu[10], uu[11], uu[12],
|
|
uu[13], uu[14], uu[15]);
|
|
}
|
|
|
|
static bool qemu_uuid_is_valid(const char *str)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < strlen(str); i++) {
|
|
const char c = str[i];
|
|
if (i == 8 || i == 13 || i == 18 || i == 23) {
|
|
if (str[i] != '-') {
|
|
return false;
|
|
}
|
|
} else {
|
|
if ((c >= '0' && c <= '9') ||
|
|
(c >= 'A' && c <= 'F') ||
|
|
(c >= 'a' && c <= 'f')) {
|
|
continue;
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
return i == 36;
|
|
}
|
|
|
|
int qemu_uuid_parse(const char *str, QemuUUID *uuid)
|
|
{
|
|
unsigned char *uu = &uuid->data[0];
|
|
int ret;
|
|
|
|
if (!qemu_uuid_is_valid(str)) {
|
|
return -1;
|
|
}
|
|
|
|
ret = sscanf(str, UUID_FMT, &uu[0], &uu[1], &uu[2], &uu[3],
|
|
&uu[4], &uu[5], &uu[6], &uu[7], &uu[8], &uu[9],
|
|
&uu[10], &uu[11], &uu[12], &uu[13], &uu[14],
|
|
&uu[15]);
|
|
|
|
if (ret != 16) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Swap from UUID format endian (BE) to the opposite or vice versa.
|
|
*/
|
|
QemuUUID qemu_uuid_bswap(QemuUUID uuid)
|
|
{
|
|
bswap32s(&uuid.fields.time_low);
|
|
bswap16s(&uuid.fields.time_mid);
|
|
bswap16s(&uuid.fields.time_high_and_version);
|
|
return uuid;
|
|
}
|