diff options
Diffstat (limited to 'src/common.rs')
| -rw-r--r-- | src/common.rs | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/src/common.rs b/src/common.rs index f7aa755..4922c73 100644 --- a/src/common.rs +++ b/src/common.rs @@ -12,9 +12,28 @@ pub const ACTIVE_LOG_FILENAME: &str = "db"; pub const DEFAULT_READ_BUF_SIZE: usize = 1024 * 1024; // 1 MB pub const FIELD_SEPARATOR: u8 = b'\x1C'; pub const ESCAPE_CHARACTER: u8 = b'\x1D'; -pub const SEQ_RECORD_SEP: &[u8] = &[FIELD_SEPARATOR, FIELD_SEPARATOR, ESCAPE_CHARACTER]; -pub const SEQ_LIT_ESCAPE: &[u8] = &[ESCAPE_CHARACTER, ESCAPE_CHARACTER, ESCAPE_CHARACTER]; -pub const SEQ_LIT_FIELD_SEP: &[u8] = &[ESCAPE_CHARACTER, FIELD_SEPARATOR, ESCAPE_CHARACTER]; + +// Special sequences. Note: these must have the same length! +// Since the log is read both forwards and backwards, we must have a signal +// character (ESCAPE_CHARACTER) on both sides of the special sequence. +pub const SEQ_RECORD_SEP: &[u8] = &[ + ESCAPE_CHARACTER, + FIELD_SEPARATOR, + FIELD_SEPARATOR, + ESCAPE_CHARACTER, +]; +pub const SEQ_LIT_ESCAPE: &[u8] = &[ + ESCAPE_CHARACTER, + ESCAPE_CHARACTER, + ESCAPE_CHARACTER, + ESCAPE_CHARACTER, +]; +pub const SEQ_LIT_FIELD_SEP: &[u8] = &[ + ESCAPE_CHARACTER, + ESCAPE_CHARACTER, + FIELD_SEPARATOR, + ESCAPE_CHARACTER, +]; #[derive(Debug, Eq, PartialEq)] pub enum SpecialSequence { |