static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
void *opaque)
{
trace_vmstate_subsection_load(vmsd->name);
while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
char idstr[256], *idstr_ret;
int ret;
uint8_t version_id, len, size;
const VMStateDescription *sub_vmsd;
len = qemu_peek_byte(f, 1);
if (len < strlen(vmsd->name) + 1) {
/* subsection name has be be "section_name/a" */
trace_vmstate_subsection_load_bad(vmsd->name, "(short)", "");
return 0;
}
size = qemu_peek_buffer(f, (uint8_t **)&idstr_ret, len, 2);
if (size != len) {
trace_vmstate_subsection_load_bad(vmsd->name, "(peek fail)", "");
return 0;
}
memcpy(idstr, idstr_ret, size);
idstr[size] = 0;
if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
trace_vmstate_subsection_load_bad(vmsd->name, idstr, "(prefix)");
/* it doesn't have a valid subsection name */
return 0;
}
sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
if (sub_vmsd == NULL) {
trace_vmstate_subsection_load_bad(vmsd->name, idstr, "(lookup)");
return -ENOENT;
}
qemu_file_skip(f, 1); /* subsection */
qemu_file_skip(f, 1); /* len */
qemu_file_skip(f, len); /* idstr */
version_id = qemu_get_be32(f);
ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
if (ret) {
trace_vmstate_subsection_load_bad(vmsd->name, idstr, "(child)");
return ret;
}
}
trace_vmstate_subsection_load_good(vmsd->name);
return 0;
}
/*
* Read 'size' bytes of data from the file.
* 'size' can be larger than the internal buffer.
*
* The data:
* may be held on an internal buffer (in which case *buf is updated
* to point to it) that is valid until the next qemu_file operation.
* OR
* will be copied to the *buf that was passed in.
*
* The code tries to avoid the copy if possible.
*
* It will return size bytes unless there was an error, in which case it will
* return as many as it managed to read (assuming blocking fd's which
* all current QEMUFile are)
*
* Note: Since **buf may get changed, the caller should take care to
* keep a pointer to the original buffer if it needs to deallocate it.
*/
size_t qemu_get_buffer_in_place(QEMUFile *f, uint8_t **buf, size_t size)
{
if (size < IO_BUF_SIZE) {
size_t res;
uint8_t *src;
res = qemu_peek_buffer(f, &src, size, 0);
if (res == size) {
qemu_file_skip(f, res);
*buf = src;
return res;
}
}
return qemu_get_buffer(f, *buf, size);
}
/*
* Read 'size' bytes of data from the file into buf.
* 'size' can be larger than the internal buffer.
*
* It will return size bytes unless there was an error, in which case it will
* return as many as it managed to read (assuming blocking fd's which
* all current QEMUFile are)
*/
int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
{
int pending = size;
int done = 0;
while (pending > 0) {
int res;
res = qemu_peek_buffer(f, buf, MIN(pending, IO_BUF_SIZE), 0);
if (res == 0) {
return done;
}
qemu_file_skip(f, res);
buf += res;
pending -= res;
done += res;
}
return done;
}
/*
* Read 'size' bytes of data from the file into buf.
* 'size' can be larger than the internal buffer.
*
* It will return size bytes unless there was an error, in which case it will
* return as many as it managed to read (assuming blocking fd's which
* all current QEMUFile are)
*/
size_t qemu_get_buffer(QEMUFile *f, uint8_t *buf, size_t size)
{
size_t pending = size;
size_t done = 0;
while (pending > 0) {
size_t res;
uint8_t *src;
res = qemu_peek_buffer(f, &src, MIN(pending, IO_BUF_SIZE), 0);
if (res == 0) {
return done;
}
memcpy(buf, src, res);
qemu_file_skip(f, res);
buf += res;
pending -= res;
done += res;
}
return done;
}
static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
void *opaque)
{
while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
char idstr[256];
int ret;
uint8_t version_id, len, size;
const VMStateDescription *sub_vmsd;
len = qemu_peek_byte(f, 1);
if (len < strlen(vmsd->name) + 1) {
/* subsection name has be be "section_name/a" */
return 0;
}
size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
if (size != len) {
return 0;
}
idstr[size] = 0;
if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
/* it don't have a valid subsection name */
return 0;
}
sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
if (sub_vmsd == NULL) {
return -ENOENT;
}
qemu_file_skip(f, 1); /* subsection */
qemu_file_skip(f, 1); /* len */
qemu_file_skip(f, len); /* idstr */
version_id = qemu_get_be32(f);
ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
if (ret) {
return ret;
}
}
return 0;
}