Read epics archiver appliance protobuf file

archapp/src/generated.rs

@@ -0,0 +1,2 @@
+#[allow(non_snake_case)]
+pub mod EPICSEvent;

archapp/src/lib.rs

@@ -0,0 +1,4 @@
+pub mod generated;
+
+#[cfg(test)]
+mod test;

archapp/src/test.rs

@@ -0,0 +1,63 @@
+use err::Error;
+use netpod::log::*;
+use protobuf::Message;
+
+fn unescape_archapp_msg(inp: &[u8]) -> Result<Vec<u8>, Error> {
+    let mut ret = Vec::with_capacity(inp.len() * 5 / 4);
+    let mut esc = false;
+    for &k in inp.iter() {
+        if k == 0x1b {
+            esc = true;
+        } else if esc {
+            if k == 0x1 {
+                ret.push(0x1b);
+            } else if k == 0x2 {
+                ret.push(0xa);
+            } else if k == 0x3 {
+                ret.push(0xd);
+            } else {
+                return Err(Error::with_msg("malformed escaped archapp message"));
+            }
+            esc = false;
+        } else {
+            ret.push(k);
+        }
+    }
+    Ok(ret)
+}
+
+#[test]
+fn read_pb_00() -> Result<(), Error> {
+    let block1 = async move {
+        let path = "../../../../archappdata/tmp/lts/ArchiverStore/SARUN16/MQUA080/X:2021_01.pb";
+        let f1 = tokio::fs::read(path).await?;
+        let mut j1 = 0;
+        loop {
+            let mut i2 = usize::MAX;
+            for (i1, &k) in f1[j1..].iter().enumerate() {
+                if k == 0xa {
+                    i2 = j1 + i1;
+                    break;
+                }
+            }
+            if i2 != usize::MAX {
+                info!("got NL  {} .. {}", j1, i2);
+                let m = unescape_archapp_msg(&f1[j1..i2])?;
+                if j1 == 0 {
+                    let payload_info = crate::generated::EPICSEvent::PayloadInfo::parse_from_bytes(&m).unwrap();
+                    info!("got payload_info: {:?}", payload_info);
+                } else {
+                    let scalar_double = crate::generated::EPICSEvent::ScalarDouble::parse_from_bytes(&m).unwrap();
+                    info!("got scalar_double: {:?}", scalar_double);
+                }
+            } else {
+                info!("no more packets");
+                break;
+            }
+            j1 = i2 + 1;
+        }
+        Ok::<_, Error>(())
+    };
+    taskrun::run(block1)?;
+    Ok(())
+}