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infer 0.2.3

Small crate to infer file types based on its magic number signature
Documentation 
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/// Returns whether a buffer is a wasm.
///
/// # Examples
///
/// ```rust
/// use std::fs;
/// assert!(infer::app::is_wasm(&fs::read("testdata/sample.wasm").unwrap()));
/// ```
pub fn is_wasm(buf: &[u8]) -> bool {
    // WASM has starts with `\0asm`, followed by the version.
    // http://webassembly.github.io/spec/core/binary/modules.html#binary-magic
    buf.len() >= 8
        && buf[0] == 0x00
        && buf[1] == 0x61
        && buf[2] == 0x73
        && buf[3] == 0x6D
        && buf[4] == 0x01
        && buf[5] == 0x00
        && buf[6] == 0x00
        && buf[7] == 0x00
}

/// Returns whether a buffer is an EXE.
///
/// # Example
///
/// ```rust
/// use std::fs;
/// assert!(infer::app::is_exe(&fs::read("testdata/sample.exe").unwrap()));
/// ```
pub fn is_exe(buf: &[u8]) -> bool {
    buf.len() > 1 && buf[0] == 0x4D && buf[1] == 0x5A
}

/// Returns whether a buffer is an ELF.
pub fn is_elf(buf: &[u8]) -> bool {
    buf.len() > 52 && buf[0] == 0x7F && buf[1] == 0x45 && buf[2] == 0x4C && buf[3] == 0x46
}

/// Returns whether a buffer is compiled Java bytecode.
pub fn is_java(buf: &[u8]) -> bool {
    buf.len() >= 8
        && buf[0] == 0x43
        && buf[1] == 0x41
        && buf[2] == 0x76
        && buf[3] == 0x45
        && ((buf[4] == 0x42 && buf[5] == 0x01 && buf[6] == 0x42 && buf[7] == 0x45)
            || (buf[4] == 0x44 && buf[5] == 0x30 && buf[6] == 0x30 && buf[7] == 0x44))
}

/// Returns whether a buffer is LLVM Bitcode.
pub fn is_llvm(buf: &[u8]) -> bool {
    buf.len() >= 2 && buf[0] == 0x42 && buf[1] == 0x43
}