From c0cc41d6c1bb7b9fb4897debb15f1f083d3c1d02 Mon Sep 17 00:00:00 2001
From: bruvzg <7645683+bruvzg@users.noreply.github.com>
Date: Mon, 20 Dec 2021 11:28:54 +0200
Subject: Improve embedded PCK loading and exporting.

Windows export process:
  Limit size of executable with embedded PCK to 4 GB.
  Use "rcedit" before embedding PCK.
  Capture and process "rcedit" errors.

Windows, Linux:
  Add support for PCK loading from executable "pck" section.
---
 core/io/file_access_pack.cpp | 68 ++++++++++++++++++++++++++++++++++----------
 1 file changed, 53 insertions(+), 15 deletions(-)

(limited to 'core/io')

diff --git a/core/io/file_access_pack.cpp b/core/io/file_access_pack.cpp
index c6e14ffee7..ba120de68b 100644
--- a/core/io/file_access_pack.cpp
+++ b/core/io/file_access_pack.cpp
@@ -32,6 +32,7 @@
 
 #include "core/io/file_access_encrypted.h"
 #include "core/object/script_language.h"
+#include "core/os/os.h"
 #include "core/version.h"
 
 #include <stdio.h>
@@ -131,32 +132,69 @@ bool PackedSourcePCK::try_open_pack(const String &p_path, bool p_replace_files,
 		return false;
 	}
 
-	f->seek(p_offset);
+	bool pck_header_found = false;
 
+	// Search for the header at the start offset - standalone PCK file.
+	f->seek(p_offset);
 	uint32_t magic = f->get_32();
+	if (magic == PACK_HEADER_MAGIC) {
+		pck_header_found = true;
+	}
 
-	if (magic != PACK_HEADER_MAGIC) {
-		// loading with offset feature not supported for self contained exe files
-		ERR_FAIL_COND_V_MSG(p_offset != 0, false, "Loading self-contained executable with offset not supported.");
+	// Search for the header in the executable "pck" section - self contained executable.
+	if (!pck_header_found) {
+		// Loading with offset feature not supported for self contained exe files.
+		if (p_offset != 0) {
+			ERR_FAIL_V_MSG(false, "Loading self-contained executable with offset not supported.");
+		}
 
-		//maybe at the end.... self contained exe
-		f->seek_end();
-		f->seek(f->get_position() - 4);
-		magic = f->get_32();
-		if (magic != PACK_HEADER_MAGIC) {
-			return false;
+		int64_t pck_off = OS::get_singleton()->get_embedded_pck_offset();
+		if (pck_off != 0) {
+			// Search for the header, in case PCK start and section have different alignment.
+			for (int i = 0; i < 8; i++) {
+				f->seek(pck_off);
+				magic = f->get_32();
+				if (magic == PACK_HEADER_MAGIC) {
+#ifdef DEBUG_ENABLED
+					print_verbose("PCK header found in executable pck section, loading from offset 0x" + String::num_int64(pck_off - 4, 16));
+#endif
+					pck_header_found = true;
+					break;
+				}
+				pck_off++;
+			}
 		}
-		f->seek(f->get_position() - 12);
+	}
 
-		uint64_t ds = f->get_64();
-		f->seek(f->get_position() - ds - 8);
+	// Search for the header at the end of file - self contained executable.
+	if (!pck_header_found) {
+		// Loading with offset feature not supported for self contained exe files.
+		if (p_offset != 0) {
+			ERR_FAIL_V_MSG(false, "Loading self-contained executable with offset not supported.");
+		}
 
+		f->seek_end();
+		f->seek(f->get_position() - 4);
 		magic = f->get_32();
-		if (magic != PACK_HEADER_MAGIC) {
-			return false;
+
+		if (magic == PACK_HEADER_MAGIC) {
+			f->seek(f->get_position() - 12);
+			uint64_t ds = f->get_64();
+			f->seek(f->get_position() - ds - 8);
+			magic = f->get_32();
+			if (magic == PACK_HEADER_MAGIC) {
+#ifdef DEBUG_ENABLED
+				print_verbose("PCK header found at the end of executable, loading from offset 0x" + String::num_int64(f->get_position() - 4, 16));
+#endif
+				pck_header_found = true;
+			}
 		}
 	}
 
+	if (!pck_header_found) {
+		return false;
+	}
+
 	uint32_t version = f->get_32();
 	uint32_t ver_major = f->get_32();
 	uint32_t ver_minor = f->get_32();
-- 
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