common: Implement Logger::get_recording().

[gps-watch.git] / src / common / logger.rs

diff --git a/src/common/logger.rs b/src/common/logger.rs
index d83d2391bfe1a6261dc2bb312e2a6a288d26ba16..23c40a140d45c76945a069220b55e5ca495420d9 100644 (file)
--- a/src/common/logger.rs
+++ b/src/common/logger.rs
@@ -25,12 +25,20 @@ use gps::TimeAndPos;
 use storage::Storage;
 use varint;
 use systick::elapsed_ms;
+use buffer::Buffer;
+use yencode::Yencode;
+use fmt::*;
 
 pub const MEMORY_SIZE: usize = 2 << 20;
 const SECTOR_SIZE: usize = 4 << 10;
 
 const NUM_SECTORS: usize = MEMORY_SIZE / SECTOR_SIZE;
 
+#[derive(Clone, Copy, PartialEq, Debug)]
+pub enum Error {
+    NoSuchRecording,
+}
+
 enum SectorFlag {
     InUse      = 1 << 0,
     DataRecord = 1 << 1,
@@ -72,6 +80,10 @@ impl SectorHeader {
 
         (self.flags & mask) == value
     }
+
+    fn belongs_to(&self, recording_id: u16) -> bool {
+        self.is_in_use() && self.recording_id == recording_id
+    }
 }
 
 #[derive(Clone, Copy)]
@@ -557,4 +569,61 @@ impl<'a> Logger<'a> {
 
         self.write_buffer_offset += num_bytes_written;
     }
+
+    ///
+    /// Retrieve recording @p recording_id and
+    /// write it to @p tx_buf in yencoded form.
+    pub fn get_recording(&mut self, recording_id: u16,
+                         tx_buf: &mut Buffer) -> Result<(), Error> {
+        if recording_id == 0 {
+            return Err(Error::NoSuchRecording);
+        }
+
+        if let Some(found_index) = self.sector_header_iter().find(|&index| {
+            let sector_header = &self.sector_header[index as usize];
+
+            sector_header.recording_id == recording_id &&
+            sector_header.starts_recording()
+        }) {
+            let mut filename = [b' '; 29];
+
+            filename[0..].copy_from_slice(b"gps-watch-recording-XXXXX.bin");
+
+            fmt_u32_pad(&mut filename[20..], recording_id as u32, 5, b'0');
+
+            let mut yenc = Yencode::new(tx_buf);
+
+            yenc.start(&filename);
+
+            let format_version = 1u8;
+            yenc.data(&[format_version]);
+
+            let mut next_sector = found_index as usize;
+
+            for _ in 0..NUM_SECTORS {
+                let address = next_sector * SECTOR_SIZE;
+                let mut buf = [0u8; SECTOR_SIZE];
+
+                self.storage.read(address, &mut buf);
+
+                // Skip flags and recording ID.
+                yenc.data(&buf[4..]);
+
+                next_sector += 1;
+                next_sector &= NUM_SECTORS - 1;
+
+                if !self.sector_header[next_sector].belongs_to(recording_id) {
+                    break;
+                }
+            }
+
+            yenc.finish();
+
+            tx_buf.flush();
+
+            Ok(())
+        } else {
+            Err(Error::NoSuchRecording)
+        }
+    }
 }