From 73234d07648ce64ee77c5d046bca3ce7776647c8 Mon Sep 17 00:00:00 2001
From: Isaac Shoebottom <ir.shoebottom@gmail.com>
Date: Mon, 4 Dec 2023 20:29:04 -0400
Subject: [PATCH] Make operation reversable

Before didn't write the final IEND chunk
---
 Assignment9/src/png.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/Assignment9/src/png.c b/Assignment9/src/png.c
index 1d998d9..94af602 100644
--- a/Assignment9/src/png.c
+++ b/Assignment9/src/png.c
@@ -126,7 +126,7 @@ int get_number_of_chunks(png_chunk **chunks) {
 	while (memcmp(chunks[i]->type, "IEND", 4) != 0) {
 		i++;
 	}
-	return i;
+	return ++i;
 }
 
 void xor_data(png_chunk *chunk) {
@@ -139,8 +139,7 @@ void xor_data(png_chunk *chunk) {
 
 void destroy_chunks(png_chunk **chunks) {
 	unsigned int size = get_number_of_chunks(chunks);
-	// +1 for IEND chunk
-	for (int i = 0; i < size + 1; i++) {
+	for (int i = 0; i < size; i++) {
 		free(chunks[i]->data);
 		free(chunks[i]);
 	}