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memory.rs
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memory.rs
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use crate::*;
pub struct Memory(pub MemoryHandle);
pub mod internal {
use super::*;
pub fn memory_alloc(n: u64) -> MemoryHandle {
let length = n;
let offset = unsafe { extism::alloc(length) };
MemoryHandle { offset, length }
}
pub fn memory_free(handle: MemoryHandle) {
unsafe { extism::free(handle.offset) }
}
pub fn memory_bytes(handle: MemoryHandle) -> Vec<u8> {
let mut data = vec![0; handle.offset as usize];
unsafe { extism::load(handle.offset, &mut data) };
data
}
pub fn memory_length(offs: u64) -> u64 {
unsafe { extism::length(offs) }
}
/// Load data from memory into a `u8` slice
pub fn load(handle: MemoryHandle, mut buf: impl AsMut<[u8]>) {
let buf = buf.as_mut();
unsafe {
extism::load(handle.offset, &mut buf[0..handle.length as usize]);
}
}
/// Load data from `u8` slice into memory
pub fn store(handle: MemoryHandle, buf: impl AsRef<[u8]>) {
let buf = buf.as_ref();
unsafe { extism::store(handle.offset, &buf[0..handle.length as usize]) }
}
/// Find `Memory` by offset
pub fn find(offset: u64) -> Option<MemoryHandle> {
let length = unsafe { extism::length(offset) };
if length == 0 {
return None;
}
Some(MemoryHandle { offset, length })
}
}
impl Memory {
pub fn offset(&self) -> u64 {
self.0.offset
}
pub fn len(&self) -> usize {
self.0.length as usize
}
pub fn is_empty(&self) -> bool {
self.0.length == 0
}
pub fn null() -> Self {
Memory(MemoryHandle {
offset: 0,
length: 0,
})
}
/// Allocate a new block with an encoded value
pub fn new<'a, T: ToBytes<'a>>(x: &T) -> Result<Self, Error> {
let data = x.to_bytes()?;
let data = data.as_ref();
let length = data.len() as u64;
let offset = unsafe { extism::alloc(length) };
unsafe { extism::store(offset, data) };
Ok(Self(MemoryHandle { offset, length }))
}
/// Create a memory block and copy bytes from `u8` slice
pub fn from_bytes(data: impl AsRef<[u8]>) -> Result<Self, Error> {
let memory = Memory::new(&data.as_ref())?;
Ok(memory)
}
/// Copy data out of memory and into a vec
pub fn to_vec(&self) -> Vec<u8> {
let mut dest = vec![0u8; self.0.length as usize];
internal::load(self.0, &mut dest);
dest
}
/// Copy data out of memory and convert to string
pub fn to_string(&self) -> Result<String, Error> {
let x = String::from_utf8(self.to_vec())?;
Ok(x)
}
/// Store memory as function output
pub fn set_output(self) {
unsafe {
extism::output_set(self.0.offset, self.0.length);
}
}
/// Log memory
pub fn log(&self, level: LogLevel) {
unsafe {
match level {
LogLevel::Info => extism::log_info(self.0.offset),
LogLevel::Debug => extism::log_debug(self.0.offset),
LogLevel::Warn => extism::log_warn(self.0.offset),
LogLevel::Error => extism::log_error(self.0.offset),
}
}
}
/// Convert to a Rust value
pub fn to<T: FromBytesOwned>(&self) -> Result<T, Error> {
T::from_bytes_owned(&self.to_vec())
}
/// Locate a memory block by offset
pub fn find(offs: u64) -> Option<Memory> {
internal::find(offs).map(Memory)
}
/// Free a memory block, allowing for it to be re-used
pub fn free(self) {
internal::memory_free(self.0)
}
}
impl From<Memory> for () {
fn from(_: Memory) {}
}
impl From<()> for Memory {
fn from(_: ()) -> Memory {
Memory(MemoryHandle::null())
}
}
impl From<Memory> for i64 {
fn from(m: Memory) -> Self {
m.0.offset as i64
}
}
impl From<Memory> for u64 {
fn from(m: Memory) -> Self {
m.0.offset
}
}
impl From<u64> for Memory {
fn from(offset: u64) -> Memory {
Memory::find(offset).unwrap_or_else(Memory::null)
}
}
impl From<i64> for Memory {
fn from(offset: i64) -> Memory {
Memory::find(offset as u64).unwrap_or_else(Memory::null)
}
}