Added check for files bigger than 4GB (#186)

Reviewed-by: 林博仁(Buo-ren, Lin) <[email protected]>
Signed-off-by: 林博仁(Buo-ren, Lin) <[email protected]>

src/woeusb

@@ -272,6 +272,13 @@ init(){
 		exit 1
 	fi
 
+	if [ "${target_filesystem_type}" == 'FAT' ]; then
+		if ! check_for_big_files\
+				"${source_fs_mountpoint}"; then
+			exit 1
+		fi
+	fi
+
 	if ! mount_target_filesystem\
 		"${target_partition}"\
 		"${target_fs_mountpoint}"\
@@ -2004,6 +2011,25 @@ util_check_function_parameters_quantity(){
 	return 0
 }; declare -fr util_check_function_parameters_quantity
 
+## Check every file in source directory for files bigger than max fat32 file size (~4GB)
+check_for_big_files(){
+	local -r source_fs_mountpoint="${1}"
+	local IFS_backup=$IFS
+
+	IFS=$'\n'
+	for file in ` find "${source_fs_mountpoint}" -type f `; do
+		if (( $(stat -c "%s" $file) > 4294967295 )); then # Max fat32 file size is 2^32 - 1 bytes
+			echo_with_color red "Error: File $file is larger than that supported by the fat32 filesystem. Use NTFS (--target-filesystem NTFS)."
+			IFS=$IFS_backup
+			unset IFS_backup
+			return 1
+		fi
+	done
+	IFS=$IFS_backup
+	unset IFS_backup
+	return 0
+}; declare -fr check_for_big_files
+
 trap trap_exit EXIT
 trap trap_errexit ERR
 trap trap_interrupt INT