replay: internal functions for replay log
This patch adds functions to perform read and write operations
with replay log.
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20150917162342.8676.29445.stgit@PASHA-ISP.def.inno>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/replay/replay-internal.c b/replay/replay-internal.c
new file mode 100644
index 0000000..04efeee
--- /dev/null
+++ b/replay/replay-internal.c
@@ -0,0 +1,155 @@
+/*
+ * replay-internal.c
+ *
+ * Copyright (c) 2010-2015 Institute for System Programming
+ * of the Russian Academy of Sciences.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu-common.h"
+#include "replay-internal.h"
+#include "qemu/error-report.h"
+#include "sysemu/sysemu.h"
+
+unsigned int replay_data_kind = -1;
+static unsigned int replay_has_unread_data;
+
+/* File for replay writing */
+FILE *replay_file;
+
+void replay_put_byte(uint8_t byte)
+{
+ if (replay_file) {
+ putc(byte, replay_file);
+ }
+}
+
+void replay_put_event(uint8_t event)
+{
+ replay_put_byte(event);
+}
+
+
+void replay_put_word(uint16_t word)
+{
+ replay_put_byte(word >> 8);
+ replay_put_byte(word);
+}
+
+void replay_put_dword(uint32_t dword)
+{
+ replay_put_word(dword >> 16);
+ replay_put_word(dword);
+}
+
+void replay_put_qword(int64_t qword)
+{
+ replay_put_dword(qword >> 32);
+ replay_put_dword(qword);
+}
+
+void replay_put_array(const uint8_t *buf, size_t size)
+{
+ if (replay_file) {
+ replay_put_dword(size);
+ fwrite(buf, 1, size, replay_file);
+ }
+}
+
+uint8_t replay_get_byte(void)
+{
+ uint8_t byte = 0;
+ if (replay_file) {
+ byte = getc(replay_file);
+ }
+ return byte;
+}
+
+uint16_t replay_get_word(void)
+{
+ uint16_t word = 0;
+ if (replay_file) {
+ word = replay_get_byte();
+ word = (word << 8) + replay_get_byte();
+ }
+
+ return word;
+}
+
+uint32_t replay_get_dword(void)
+{
+ uint32_t dword = 0;
+ if (replay_file) {
+ dword = replay_get_word();
+ dword = (dword << 16) + replay_get_word();
+ }
+
+ return dword;
+}
+
+int64_t replay_get_qword(void)
+{
+ int64_t qword = 0;
+ if (replay_file) {
+ qword = replay_get_dword();
+ qword = (qword << 32) + replay_get_dword();
+ }
+
+ return qword;
+}
+
+void replay_get_array(uint8_t *buf, size_t *size)
+{
+ if (replay_file) {
+ *size = replay_get_dword();
+ if (fread(buf, 1, *size, replay_file) != *size) {
+ error_report("replay read error");
+ }
+ }
+}
+
+void replay_get_array_alloc(uint8_t **buf, size_t *size)
+{
+ if (replay_file) {
+ *size = replay_get_dword();
+ *buf = g_malloc(*size);
+ if (fread(*buf, 1, *size, replay_file) != *size) {
+ error_report("replay read error");
+ }
+ }
+}
+
+void replay_check_error(void)
+{
+ if (replay_file) {
+ if (feof(replay_file)) {
+ error_report("replay file is over");
+ qemu_system_vmstop_request_prepare();
+ qemu_system_vmstop_request(RUN_STATE_PAUSED);
+ } else if (ferror(replay_file)) {
+ error_report("replay file is over or something goes wrong");
+ qemu_system_vmstop_request_prepare();
+ qemu_system_vmstop_request(RUN_STATE_INTERNAL_ERROR);
+ }
+ }
+}
+
+void replay_fetch_data_kind(void)
+{
+ if (replay_file) {
+ if (!replay_has_unread_data) {
+ replay_data_kind = replay_get_byte();
+ replay_check_error();
+ replay_has_unread_data = 1;
+ }
+ }
+}
+
+void replay_finish_event(void)
+{
+ replay_has_unread_data = 0;
+ replay_fetch_data_kind();
+}
