[PATCH 03/19] Introduce skip_header parameter to qemu_loadvm_state().

[Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>]

Introduce skip_header parameter to qemu_loadvm_state() so that it can
be called iteratively without reading the header.

Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>
---
 migration.c |    2 +-
 savevm.c    |   24 +++++++++++++-----------
 sysemu.h    |    2 +-
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/migration.c b/migration.c
index f0df5fc..dd3bf94 100644
--- a/migration.c
+++ b/migration.c
@@ -63,7 +63,7 @@ int qemu_start_incoming_migration(const char *uri)
 
 void process_incoming_migration(QEMUFile *f)
 {
-    if (qemu_loadvm_state(f) < 0) {
+    if (qemu_loadvm_state(f, 0) < 0) {
         fprintf(stderr, "load of migration failed\n");
         exit(0);
     }
diff --git a/savevm.c b/savevm.c
index 6c4c72b..58e48e3 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1716,7 +1716,7 @@ typedef struct LoadStateEntry {
     int version_id;
 } LoadStateEntry;
 
-int qemu_loadvm_state(QEMUFile *f)
+int qemu_loadvm_state(QEMUFile *f, int skip_header)
 {
     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
         QLIST_HEAD_INITIALIZER(loadvm_handlers);
@@ -1729,17 +1729,19 @@ int qemu_loadvm_state(QEMUFile *f)
         return -EINVAL;
     }
 
-    v = qemu_get_be32(f);
-    if (v != QEMU_VM_FILE_MAGIC)
-        return -EINVAL;
+    if (!skip_header) {
+        v = qemu_get_be32(f);
+        if (v != QEMU_VM_FILE_MAGIC)
+            return -EINVAL;
 
-    v = qemu_get_be32(f);
-    if (v == QEMU_VM_FILE_VERSION_COMPAT) {
-        fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
-        return -ENOTSUP;
+        v = qemu_get_be32(f);
+        if (v == QEMU_VM_FILE_VERSION_COMPAT) {
+            fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
+            return -ENOTSUP;
+        }
+        if (v != QEMU_VM_FILE_VERSION)
+            return -ENOTSUP;
     }
-    if (v != QEMU_VM_FILE_VERSION)
-        return -ENOTSUP;
 
     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
         uint32_t instance_id, version_id, section_id;
@@ -2062,7 +2064,7 @@ int load_vmstate(const char *name)
         return -EINVAL;
     }
 
-    ret = qemu_loadvm_state(f);
+    ret = qemu_loadvm_state(f, 0);
 
     qemu_fclose(f);
     if (ret < 0) {
diff --git a/sysemu.h b/sysemu.h
index 23ae17e..c86b4e8 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -81,7 +81,7 @@ int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f);
 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f);
 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f);
-int qemu_loadvm_state(QEMUFile *f);
+int qemu_loadvm_state(QEMUFile *f, int skip_header);
 
 /* SLIRP */
 void do_info_slirp(Monitor *mon);
-- 
1.7.1.2

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