Created
March 20, 2015 17:44
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Binary Read
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| * Reads a ROM file and returns a vector containing | |
| * its bytes if successful. Otherwise an error string | |
| * if the file is too large or IoError is raised */ | |
| fn read_rom(file_path: String) -> Result<Vec<u8>,String> { | |
| match File::open(&Path::new(file_path)).read_to_end() { | |
| Ok(rom_contents) => { | |
| /* Programs start at address 0x200, in original implementation | |
| * 0x000 - 0x1FF reserved for VM, just pad start of mem with | |
| * 0s in this case */ | |
| let start_mem : Vec<u8> = iter::repeat(0u8).take(START_RAM).collect(); | |
| let mem = start_mem + rom_contents.as_slice(); | |
| let size = mem.len(); | |
| if size <= MAX_RAM { | |
| Ok(mem) | |
| } else { /* Memory read in from game ROM is too large */ | |
| Err(format!("game image is too large | |
| ({} bytes), must be a maximum of {} bytes" | |
| ,size , MAX_RAM - START_RAM).to_string()) | |
| } | |
| }, | |
| /* Error reading file */ | |
| Err(e) => Err(e.detail.unwrap_or("".to_string())) | |
| } | |
| } |
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