simple_parse is a declarative binary stream parser that aims to generate the most efficient parsing code possible for your custom types while remaining safe.
| Features | Description |
|:----:|:----|
| Fast| The generated parsing code is often faster than "idiomatic" C implementations|
| No copy | Able to return references into byte slices |
| Built-in endianness support | Annotating structs/fields with endian gives control over how numbers will be parsed |
| Convert back to bytes | In addition to parsing arbitrary bytes, simple_parse also allows dumping structs back into binary form |
If simple_parse is unable to describe your complex/non-standard binary formats, take a look at deku.
Snippets taken from examples/struct.rs ```Rust use ::simple_parse::{SpRead, SpWrite};
pub struct SomeStruct {
pub some_field: u8,
#[sp(endian="big")]
pub items: Vec
// Emulate data coming from a socket let mut srvsock: &[u8] = &[ 1, // somefield 0,0,0,2, // items.len() 0xDE,0xAD,0xBE,0xEF, // items[0] 0xBA,0xDC,0x0F,0xFE // items[1] ];
// Parse incoming bytes into SomeStruct let mut mystruct = SomeStruct::fromreader(&mut srv_sock)?;
/// Modify the struct my_struct.items.push(0xFFFFFFFF);
/// Encode our struct back into bytes
let mut clisock: Vec
For complete examples see : examples
In vague order of priority, simple_parse aims to provide :
In other words, simple_parse will try to generate the most performant code while never compromising on safety.
Secondly, priority will be given to ease of use by providing default implementations that work well in most cases while also allowing some customisation to accomodate for binary formats we cannot control (see the bmp image parsing example).
simple_parse provides a few ways to enhance the generate parsing code. See attributes.rs for an exhaustive list of options.
It is possible to insert validation "hooks" at any point in the parsing/writing process.
For example, BMP image headers must always start with the two first bytes being 'BM' :
```Rust
struct BmpHeader { #[sp(validate = "validateheader")] magic: u16, size: u32, reserved1: u16, reserved2: u16, pixelarray_offset: u32, // ... ``` (Taken from bmp example)
This tells simple_parse to insert a call to validate_header(magic: &u16, ctx: &mut SpCtx) directly after having populated the u16 when reading and before dumping the struct as bytes when writing.
simple_parse provides default implementations for dynamically sized types by simply prepending the number of elements (count) followed by the elements.
i.e. A VecRust
// [count] | [count] * [elements]
[3u32][val1][val2][val3]
When parsing binary formats that dont follow this layout, you can annotate your dynamically sized field with count :
Rust
pub struct File {
pub content_len: u16,
pub filename: String, // Use the default prepended count
#[sp(count="content_len")]
pub contents: Vec<u8>, // Use an existing field as the count
The content_len field will be used to populate contents and contents.len() will be written at that offset when writing.
When simple_parse's default reading and writing implementations are not well suited for your formats, you can override them with the reader and writer attributes.
Rust
struct BmpHeader {
comp_bitmask: u32,
#[sp(
reader="BmpComp::read, comp_bitmask",
writer="BmpComp::write",
)]
compression_info: BmpComp,
//...
When reading, this will generate code like :
Rust
compression_info = BmpComp::read(comp_bitmask: &u32, src: &mut Read, ctx: &mut SpCtx)?;
And when writing :
Rust
written_sz += BmpComp::write(&self.compression_info, ctx: &mut SpCtx, dst: &mut Write)?;
Note : Using reader will generate suboptimal parsing code as simple_parse cannot make any assumptions about the custom reader's impact on the input bytes.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.