From 670adf41511b9c04ef73e8acf40867c5b11c01f2 Mon Sep 17 00:00:00 2001
From: neonloop
Date: Sun, 5 Feb 2023 23:57:20 +0000
Subject: Uses file size instead of core-reported size for state loads

Fixes dosbox-pure and other cores with varying state sizes
---
 core.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/core.c b/core.c
index b758e7c..61a14b5 100644
--- a/core.c
+++ b/core.c
@@ -133,26 +133,30 @@ bool state_exists(int slot) {
 
 int state_read(void) {
 	char filename[MAX_PATH];
+	struct stat stat;
+	size_t state_size;
 	FILE *state_file = NULL;
 	void *state = NULL;
 	int ret = -1;
 
-	size_t state_size = current_core.retro_serialize_size();
-	if (!state_size) {
-		return 0;
+	state_file_name(filename, MAX_PATH, state_slot);
+
+	state_file = fopen(filename, "r");
+	if (!state_file) {
+		PA_ERROR("Error opening state file: %s\n", strerror(errno));
+		goto error;
 	}
 
-	state = calloc(1, state_size);
-	if (!state) {
-		PA_ERROR("Couldn't allocate memory for state\n");
+	if (fstat(fileno(state_file), &stat) == -1) {
+		PA_ERROR("Couldn't read state file size: %s\n", strerror(errno));
 		goto error;
 	}
 
-	state_file_name(filename, MAX_PATH, state_slot);
+	state_size = stat.st_size;
 
-	state_file = fopen(filename, "r");
-	if (!state_file) {
-		PA_ERROR("Error opening state file: %s\n", strerror(errno));
+	state = calloc(1, state_size);
+	if (!state) {
+		PA_ERROR("Couldn't allocate memory for state\n");
 		goto error;
 	}
 
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