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under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +//#![warn(missing_docs)] + +// TODO: replace unwrap with more nady error +// TODO: add some docs + +use parity_wasm; +use parity_wasm::elements::{NameSection, ModuleNameSubsection, Serialize}; +use clap::{App, Arg, SubCommand}; +use exitfailure::ExitFailure; +use failure::err_msg; + +const VERSION: &str = env!("CARGO_PKG_VERSION"); +const AUTHORS: &str = env!("CARGO_PKG_AUTHORS"); +const DESCRIPTION: &str = env!("CARGO_PKG_DESCRIPTION"); + +const MODULE_PATH: &str = "module_path"; +const NEW_MODULE_NAME: &str = "new_module_name"; + +fn show_module_name_subcommand<'a, 'b>() -> App<'a, 'b> { + let arg = &[Arg::with_name(MODULE_PATH) + .required(true) + .takes_value(true) + .help("path to the wasm file") + ]; + + SubCommand::with_name("show") + .about("Show Wasm file name") + .args(arg) +} + +fn set_module_name_subcommand<'a, 'b>() -> App<'a, 'b> { + let args = &[ + Arg::with_name(MODULE_PATH) + .required(true) + .takes_value(true) + .help("path to the Wasm file"), + Arg::with_name(NEW_MODULE_NAME) + .required(true) + .takes_value(true) + .help("a new module name"), + ]; + + SubCommand::with_name("set") + .about("Set Wasm file name") + .args(args) +} + +fn main() -> Result<(), ExitFailure> { + let app = App::new("Fluence wasm-module-name") + .version(VERSION) + .author(AUTHORS) + .about(DESCRIPTION) + .subcommand(show_module_name_subcommand()) + .subcommand(set_module_name_subcommand()); + + match app.get_matches().subcommand() { + ("show", Some(arg)) => { + let module_path = arg.value_of(MODULE_PATH).unwrap(); + + let module = parity_wasm::deserialize_file(module_path).unwrap(); + let module = module.parse_names().unwrap(); + let name_section = module.names_section(); + + let no_module_name: &str = ""; + + let module_name = match name_section { + Some(name_section) => { + match name_section.module_name_subsection() { + Some(name_section) => name_section.name(), + None => no_module_name, + } + } + None => no_module_name, + }; + + println!("The module name {}", module_name); + Ok(()) + }, + + ("set", Some(args)) => { + let module_path = args.value_of(MODULE_PATH).unwrap(); + let new_module_name = args.value_of(NEW_MODULE_NAME).unwrap(); + + let module = parity_wasm::deserialize_file(module_path).unwrap(); + let mut module = module.parse_names().unwrap(); + let name_section = module.names_section_mut(); + + let new_module_name_subsection = ModuleNameSubsection::new(new_module_name); + match name_section { + Some(mut name_section) => + *name_section.module_name_subsection_mut() = Some(new_module_name_subsection), + None => { + let name_section = NameSection::new(Some(new_module_name_subsection), None, None); + + let mut buffer = vec![]; + name_section.serialize(&mut buffer).unwrap(); + + module.set_custom_section("name", buffer); + } + }; + + parity_wasm::serialize_to_file(module_path, module).unwrap(); + Ok(()) + }, + + c => Err(err_msg(format!("Unexpected command: {}", c.0)))?, + } +}