Merge pull request #10 from jozanza/patch-1

Add basic memory module

src/lib.rs

@@ -3,10 +3,13 @@ mod cgi_host;
 mod error;
 mod http;
 mod http_host;
+mod memory;
+mod memory_host;
 mod socket;
 mod socket_host;
 
 pub use cgi::*;
 pub use error::*;
 pub use http::*;
+pub use memory::*;
 pub use socket::*;

src/memory.rs

@@ -0,0 +1,21 @@
+use crate::memory_host::*;
+
+pub fn read_stdin(buf: &mut [u8]) -> std::io::Result<u32> {
+    let mut len = 0;
+    let errno = unsafe { memory_read(buf.as_mut_ptr(), buf.len() as _, &mut len) };
+    if errno == 0 {
+        return Ok(len);
+    }
+    let err = std::io::Error::from_raw_os_error(errno as i32);
+    Err(err)
+}
+
+pub fn read_env_vars(buf: &mut [u8]) -> std::io::Result<u32> {
+    let mut len = 0;
+    let errno = unsafe { env_var_read(buf.as_mut_ptr(), buf.len() as _, &mut len) };
+    if errno == 0 {
+      return Ok(len);
+    }
+    let err = std::io::Error::from_raw_os_error(errno as i32);
+    Err(err)
+}

src/memory_host.rs

@@ -0,0 +1,7 @@
+    #[link(wasm_import_module = "blockless_memory")]
+    extern "C" {
+        #[link_name = "memory_read"]
+        pub(crate) fn memory_read(buf: *mut u8, len: u32, num: *mut u32) -> u32;
+        #[link_name = "env_var_read"]
+        pub(crate) fn env_var_read(buf: *mut u8, len: u32, num: *mut u32) -> u32;
+    }