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//! An immutable, high-level API for the RuneScape cache file system.
//!
//! This crate provides convenient access to the binary file system of the [Oldschool RuneScape] and [RuneScape 3] caches.
//!
//! The library's API is mainly focused around reading bytes easily.
//! Therefore, it offers a higher level of abstraction compared to other libraries. Most cache API's expose a
//! wide variety of internal types to let the user tinker around with the cache in unusual ways.
//! To avoid undefined behavior, most internal types are kept private.
//! The goal of this crate is to provide a simple interface for basic reading of valuable data.
//!
//! Note that this crate is still evolving; both OSRS & RS3 are not fully supported/implemented and
//! will probably contain bugs or miss vital features. If this is the case for you then consider [opening
//! an issue].
//!
//! # Safety
//!
//! This crate internally uses [memmap] and this is safe because: the RuneScape cache is a read-only binary file system
//! which is never modified by any process, and should never be modified. [`Mmap`] provides basic file safety with
//! [`std::file::File`]. It is not possible to prevent parallel access to a certain file and prevent modifications.
//! Therefore file-backed mapped memory is inherently unsafe.
//!
//! # Features
//!
//! The cache's protocol defaults to OSRS. In order to use the RS3 protocol you can enable the _**rs3**_ feature flag.
//! A lot of types derive [serde]'s `Serialize` and `Deserialize`. To enable (de)serialization on
//! most types use the _**serde-derive**_ feature flag.
//!
//! # Quick Start
//!
//! ```
//! use rscache::Cache;
//!
//! # fn main() -> rscache::Result<()> {
//! let cache = Cache::new("./data/osrs_cache")?;
//!
//! let index_id = 2; // Config index.
//! let archive_id = 10; // Archive containing item definitions.
//!
//! let buffer: Vec<u8> = cache.read(index_id, archive_id)?;
//! # Ok(())
//! # }
//! ```
//!
//! # Loaders
//!
//! In order to get [definitions](crate::definition) you can look at the [loaders](crate::loader) this library provides.
//! The loaders use the cache as a dependency to parse in their data and cache the relevant definitions internally.
//! The loader module also tells you how to make a loader if this crate doesn't (yet) provide it.
//!
//! Note: Some loaders cache these definitions lazily because of either the size of the data or the
//! performance. The map loader for example is both slow and large so caching is by default lazy.
//! Lazy loaders require mutability.
//!
//! [Oldschool RuneScape]: https://oldschool.runescape.com/
//! [RuneScape 3]: https://www.runescape.com/
//! [opening an issue]: https://github.com/jimvdl/rs-cache/issues/new
//! [serde]: https://crates.io/crates/serde
//! [memmap]: https://crates.io/crates/memmap
//! [`Mmap`]: https://docs.rs/memmap/0.7.0/memmap/struct.Mmap.html
//! [`std::file::File`]: https://doc.rust-lang.org/std/fs/struct.File.html
#![deny(clippy::all, clippy::nursery)]
#![warn(
clippy::clone_on_ref_ptr,
clippy::redundant_clone,
clippy::default_trait_access,
clippy::expl_impl_clone_on_copy,
clippy::explicit_into_iter_loop,
clippy::explicit_iter_loop,
clippy::manual_filter_map,
clippy::filter_map_next,
clippy::manual_find_map,
clippy::get_unwrap,
clippy::items_after_statements,
clippy::large_digit_groups,
clippy::map_flatten,
clippy::match_same_arms,
clippy::maybe_infinite_iter,
clippy::mem_forget,
clippy::missing_inline_in_public_items,
clippy::multiple_inherent_impl,
clippy::mut_mut,
clippy::needless_continue,
clippy::needless_pass_by_value,
clippy::map_unwrap_or,
clippy::unused_self,
clippy::similar_names,
clippy::single_match_else,
clippy::too_many_lines,
clippy::type_repetition_in_bounds,
clippy::unseparated_literal_suffix,
clippy::used_underscore_binding,
clippy::should_implement_trait,
clippy::no_effect
)]
// TODO: add rust-version to [package]
// TODO: run cargo outdated when it is fixed for stable 1.56
// TODO: maybe refactor read internal to include ::std::cmp::min() -> min(buf.len(), state.data.len())
// buf[..n].copy_from_slice(data[..n]) see 1:13:41
// TODO: reorder all structs and impl blocks in crate
#[macro_use]
pub mod util;
mod archive;
pub mod checksum;
pub mod codec;
pub mod definition;
pub mod error;
pub mod extension;
mod index;
pub mod loader;
pub mod parse;
mod sector;
#[doc(inline)]
pub use error::{CacheError, Result};
pub(crate) const MAIN_DATA: &str = "main_file_cache.dat2";
pub(crate) const REFERENCE_TABLE: u8 = 255;
use std::{fs::File, io::Write, path::Path};
use crc::crc32;
use memmap::Mmap;
use nom::{combinator::cond, number::complete::be_u32};
#[cfg(feature = "rs3")]
use whirlpool::{Digest, Whirlpool};
use crate::{
archive::ArchiveRef,
checksum::{Checksum, Entry},
error::{ParseError, ReadError},
index::Indices,
sector::{Sector, SECTOR_SIZE},
};
/// A parsed Jagex cache.
#[derive(Debug)]
pub struct Cache {
data: Mmap,
indices: Indices,
}
impl Cache {
/// Constructs a new `Cache`.
///
/// Each valid index is parsed and stored, and in turn all archive references as well.
/// If an index is not present it will simply be skipped.
/// However, the main data file and reference table both are required.
///
/// # Errors
///
/// If this function encounters any form of I/O or other error, a `CacheError`
/// is returned which wraps the underlying error.
#[inline]
pub fn new<P: AsRef<Path>>(path: P) -> crate::Result<Self> {
let path = path.as_ref();
let main_file = File::open(path.join(MAIN_DATA))?;
let data = unsafe { Mmap::map(&main_file)? };
let indices = Indices::new(path, &data)?;
Ok(Self { data, indices })
}
/// Reads from the internal data.
///
/// A lookup is performed on the specified index to find the sector id and the total length
/// of the buffer that needs to be read from the `main_file_cache.dat2`.
///
/// If the lookup is successfull the data is gathered into a `Vec<u8>`.
///
/// # Errors
///
/// Returns an `IndexNotFound` error if the specified `index_id` is not a valid `Index`.\
/// Returns an `ArchiveNotFound` error if the specified `archive_id` is not a valid `Archive`.
#[inline]
pub fn read(&self, index_id: u8, archive_id: u32) -> crate::Result<Vec<u8>> {
let index = self
.indices
.get(&index_id)
.ok_or(ReadError::IndexNotFound(index_id))?;
let archive = index
.archive_refs
.get(&archive_id)
.ok_or(ReadError::ArchiveNotFound(index_id, archive_id))?;
let mut buffer = Vec::with_capacity(archive.length);
self.data.read_internal(archive, &mut buffer)?;
assert_eq!(buffer.len(), archive.length);
Ok(buffer)
}
pub(crate) fn read_archive(&self, archive: &ArchiveRef) -> crate::Result<Vec<u8>> {
self.read(archive.index_id, archive.id)
}
/// Reads bytes from the cache into the given writer.
///
/// This will not allocate a buffer but use the writer instead, see [`read`](Cache::read)
///
/// # Errors
///
/// Returns an `IndexNotFound` error if the specified `index_id` is not a valid `Index`.\
/// Returns an `ArchiveNotFound` error if the specified `archive_id` is not a valid `Archive`.
#[inline]
pub fn read_into_writer<W: Write>(
&self,
index_id: u8,
archive_id: u32,
writer: &mut W,
) -> crate::Result<()> {
let index = self
.indices
.get(&index_id)
.ok_or(ReadError::IndexNotFound(index_id))?;
let archive = index
.archive_refs
.get(&archive_id)
.ok_or(ReadError::ArchiveNotFound(index_id, archive_id))?;
self.data.read_internal(archive, writer)
}
/// Creates a `Checksum` which can be used to validate the cache data
/// that the client received during the update protocol.
///
/// NOTE: The RuneScape client doesn't have a valid crc for index 16.
/// This checksum sets the crc and version for index 16 both to 0.
/// The crc for index 16 should be skipped.
///
/// # Errors
///
/// Returns an error when a buffer read from the reference
/// table could not be decoded / decompressed.
#[inline]
pub fn create_checksum(&self) -> crate::Result<Checksum> {
let mut checksum = Checksum::new(self.index_count());
for index_id in 0..self.index_count() as u32 {
if let Ok(buffer) = self.read(REFERENCE_TABLE, index_id) {
if !buffer.is_empty() && index_id != 47 {
let data = codec::decode(&buffer)?;
let (_, version) = cond(data[0] >= 6, be_u32)(&data[1..5])?;
let version = version.unwrap_or(0);
#[cfg(feature = "rs3")]
let hash = {
let mut hasher = Whirlpool::new();
hasher.update(&buffer);
hasher.finalize().as_slice().to_vec()
};
checksum.push(Entry {
crc: crc32::checksum_ieee(&buffer),
version,
#[cfg(feature = "rs3")]
hash,
});
} else {
checksum.push(Entry::default());
}
};
}
Ok(checksum)
}
/// Tries to return the huffman table from the cache.
///
/// This can be used to (de)compress chat messages, see [`Huffman`](crate::util::Huffman).
#[inline]
pub fn huffman_table(&self) -> crate::Result<Vec<u8>> {
let index_id = 10;
let archive = self.archive_by_name(index_id, "huffman")?;
let buffer = self.read_archive(archive)?;
codec::decode(&buffer)
}
#[inline]
pub(crate) fn archive_by_name<T: AsRef<str>>(
&self,
index_id: u8,
name: T,
) -> crate::Result<&ArchiveRef> {
let index = self
.indices
.get(&index_id)
.ok_or(ReadError::IndexNotFound(index_id))?;
let hash = util::djd2::hash(&name);
let archive = index
.archives
.iter()
.find(|archive| archive.name_hash == hash)
.ok_or_else(|| ReadError::NameNotInArchive(hash, name.as_ref().into(), index_id))?;
let archive_ref = index
.archive_refs
.get(&archive.id)
.ok_or(ReadError::ArchiveNotFound(index_id, archive.id))?;
Ok(archive_ref)
}
#[inline]
pub fn index_count(&self) -> usize {
self.indices.len()
}
}
pub(crate) trait ReadInternal {
fn read_internal<W: Write>(&self, archive: &ArchiveRef, writer: &mut W) -> crate::Result<()>;
}
impl ReadInternal for Mmap {
#[inline]
fn read_internal<W: Write>(&self, archive: &ArchiveRef, writer: &mut W) -> crate::Result<()> {
let mut current_sector = archive.sector;
let (header_size, chunks) = archive.chunks();
for (chunk, data_len) in chunks.enumerate() {
let offset = current_sector * SECTOR_SIZE;
let data_block = &self[offset..offset + data_len];
match Sector::new(data_block, &header_size) {
Ok(sector) => {
sector
.header
.validate(archive.id, chunk, archive.index_id)?;
current_sector = sector.header.next;
writer.write_all(sector.data_block)?;
}
Err(_) => return Err(ParseError::Sector(archive.sector).into()),
};
}
Ok(())
}
}