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use crate::*;
use std::io::Read;
pub struct Program {
pub bytecode: Vec<u8>,
pub path: Option<PathBuf>,
}
impl Program {
fn path(&self) -> String {
match &self.path {
Some(path) => path.as_os_str().to_string_lossy().to_string(),
None => String::from("<unknown>"),
}
}
}
/// Load program from path or standard input.
pub fn load_program(path: Option<&PathBuf>) -> Program {
if let Some(path) = path {
if let Ok(program) = load_program_from_file(path) {
let length = program.bytecode.len();
let path = program.path();
info!("Loaded program from {path:?} ({length} bytes)");
return program;
} else if let Some(program) = load_program_from_bedrock_path(path) {
let length = program.bytecode.len();
let path = program.path();
info!("Loaded program from {path:?} ({length} bytes)");
return program;
} else {
fatal!("Could not read program from {path:?}");
}
} else {
info!("Reading program from standard input...");
if let Ok(program) = load_program_from_stdin() {
let length = program.bytecode.len();
info!("Loaded program from standard input ({length} bytes)");
return program;
} else {
fatal!("Could not read program from standard input");
}
}
}
/// Attempt to load program from a directory in the BEDROCK_PATH environment variable.
fn load_program_from_bedrock_path(path: &Path) -> Option<Program> {
// Only if the path can be treated as a file name.
if path.is_relative() && path.components().count() == 1 {
for base_path in std::env::var("BEDROCK_PATH").ok()?.split(':') {
let mut base_path = PathBuf::from(base_path);
if !base_path.is_absolute() { continue; }
base_path.push(path);
info!("Attempting to load program from {base_path:?}");
if let Ok(program) = load_program_from_file(&base_path) {
return Some(program);
}
if path.extension().is_some() { continue; }
base_path.set_extension("br");
info!("Attempting to load program from {base_path:?}");
if let Ok(program) = load_program_from_file(&base_path) {
return Some(program);
}
}
}
return None;
}
/// Attempt to load program from a specific file path.
fn load_program_from_file(path: &Path) -> Result<Program, std::io::Error> {
// Canonicalize paths so that symbolic links to program files resolve to
// the real program directory, which could contain a symbols file.
let path = match path.canonicalize() {
Ok(canonical) => canonical,
Err(_) => path.to_path_buf(),
};
load_program_from_readable_source(std::fs::File::open(&path)?, Some(&path))
}
/// Attempt to load program from standard input.
fn load_program_from_stdin() -> Result<Program, std::io::Error> {
load_program_from_readable_source(std::io::stdin(), None)
}
/// Attempt to load program from a source that implements std::io::Read.
fn load_program_from_readable_source(source: impl Read, path: Option<&Path>) -> Result<Program, std::io::Error> {
let mut bytecode = Vec::<u8>::new();
source.take(65536).read_to_end(&mut bytecode)?;
return Ok(Program { bytecode, path: path.map(|p| p.to_path_buf()) });
}
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