Merge pull request #89214 from bruvzg/pack_rel_off

[Export] Use relative file base offset for embedded PCK.

core/io/file_access_pack.cpp

@@ -196,6 +196,8 @@ bool PackedSourcePCK::try_open_pack(const String &p_path, bool p_replace_files,
 		return false;
 	}
 
+	int64_t pck_start_pos = f->get_position() - 4;
+
 	uint32_t version = f->get_32();
 	uint32_t ver_major = f->get_32();
 	uint32_t ver_minor = f->get_32();
@@ -208,6 +210,7 @@ bool PackedSourcePCK::try_open_pack(const String &p_path, bool p_replace_files,
 	uint64_t file_base = f->get_64();
 
 	bool enc_directory = (pack_flags & PACK_DIR_ENCRYPTED);
+	bool rel_filebase = (pack_flags & PACK_REL_FILEBASE);
 
 	for (int i = 0; i < 16; i++) {
 		//reserved
@@ -216,6 +219,10 @@ bool PackedSourcePCK::try_open_pack(const String &p_path, bool p_replace_files,
 
 	int file_count = f->get_32();
 
+	if (rel_filebase) {
+		file_base += pck_start_pos;
+	}
+
 	if (enc_directory) {
 		Ref<FileAccessEncrypted> fae;
 		fae.instantiate();

core/io/file_access_pack.h

@@ -44,7 +44,8 @@
 #define PACK_FORMAT_VERSION 2
 
 enum PackFlags {
-	PACK_DIR_ENCRYPTED = 1 << 0
+	PACK_DIR_ENCRYPTED = 1 << 0,
+	PACK_REL_FILEBASE = 1 << 1,
 };
 
 enum PackFileFlags {

editor/export/editor_export_platform.cpp

@@ -1613,6 +1613,9 @@ Error EditorExportPlatform::save_pack(const Ref<EditorExportPreset> &p_preset, b
 	if (enc_pck && enc_directory) {
 		pack_flags |= PACK_DIR_ENCRYPTED;
 	}
+	if (p_embed) {
+		pack_flags |= PACK_REL_FILEBASE;
+	}
 	f->store_32(pack_flags); // flags
 
 	uint64_t file_base_ofs = f->get_position();
@@ -1703,8 +1706,12 @@ Error EditorExportPlatform::save_pack(const Ref<EditorExportPreset> &p_preset, b
 	}
 
 	uint64_t file_base = f->get_position();
+	uint64_t file_base_store = file_base;
+	if (pack_flags & PACK_REL_FILEBASE) {
+		file_base_store -= pck_start_pos;
+	}
 	f->seek(file_base_ofs);
-	f->store_64(file_base); // update files base
+	f->store_64(file_base_store); // update files base
 	f->seek(file_base);
 
 	// Save the rest of the data.
@@ -1745,6 +1752,7 @@ Error EditorExportPlatform::save_pack(const Ref<EditorExportPreset> &p_preset, b
 			*r_embedded_size = f->get_position() - embed_pos;
 		}
 	}
+	f->close();
 
 	DirAccess::remove_file_or_error(tmppath);