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// ---------------- [ File: bitcoinleveldb-versionedit/src/versionedit_decode_from.rs ]
crate::ix!();
impl VersionEdit {
pub fn decode_from(&mut self, src: &Slice) -> Status {
trace!("VersionEdit::decode_from: decoding from manifest record");
self.reset_core_state();
// Working copy of the input Slice.
let mut input = unsafe {
Slice::from_ptr_len(*src.data(), *src.size())
};
let mut msg: Option<&'static str> = None;
let mut tag: u32 = 0;
// Temporary storage for parsing
let mut level: i32 = 0;
let mut number: u64 = 0;
let mut str_slice = Slice::default();
let mut key = InternalKey::default();
while msg.is_none() && get_varint32(&mut input, &mut tag) {
match tag {
1 => {
// kComparator
if get_length_prefixed_slice(&mut input, &mut str_slice) {
self.set_comparator_name(&str_slice);
debug!(
"VersionEdit::decode_from: parsed comparator '{}'",
str_slice.to_string()
);
} else {
msg = Some("comparator name");
}
}
2 => {
// kLogNumber
let mut log_num: u64 = 0;
if get_varint64(&mut input, &mut log_num) {
self.set_log_number(log_num);
debug!(
"VersionEdit::decode_from: parsed log_number={}",
self.log_number()
);
} else {
msg = Some("log number");
}
}
9 => {
// kPrevLogNumber
let mut prev_log: u64 = 0;
if get_varint64(&mut input, &mut prev_log) {
self.set_prev_log_number(prev_log);
debug!(
"VersionEdit::decode_from: parsed prev_log_number={}",
self.prev_log_number()
);
} else {
msg = Some("previous log number");
}
}
3 => {
// kNextFileNumber
let mut next_file: u64 = 0;
if get_varint64(&mut input, &mut next_file) {
self.set_next_file(next_file);
debug!(
"VersionEdit::decode_from: parsed next_file_number={}",
self.next_file_number()
);
} else {
msg = Some("next file number");
}
}
4 => {
// kLastSequence
let mut seq: u64 = 0;
if get_varint64(&mut input, &mut seq) {
self.set_last_sequence(seq as SequenceNumber);
debug!(
"VersionEdit::decode_from: parsed last_sequence={}",
self.last_sequence()
);
} else {
msg = Some("last sequence number");
}
}
5 => {
// kCompactPointer
if get_level(&mut input, &mut level)
&& get_internal_key(&mut input, &mut key)
{
debug!(
"VersionEdit::decode_from: parsed compact pointer level={} key={:?}",
level,
key
);
self.set_compact_pointer(level, &key);
} else {
msg = Some("compaction pointer");
}
}
6 => {
// kDeletedFile
if get_level(&mut input, &mut level)
&& get_varint64(&mut input, &mut number)
{
debug!(
"VersionEdit::decode_from: parsed deleted file level={} file={}",
level,
number
);
self.delete_file(level, number);
} else {
msg = Some("deleted file");
}
}
7 => {
// kNewFile
let mut file_level: i32 = 0;
let mut file_number: u64 = 0;
let mut file_size: u64 = 0;
let mut smallest_key = InternalKey::default();
let mut largest_key = InternalKey::default();
if get_level(&mut input, &mut file_level)
&& get_varint64(&mut input, &mut file_number)
&& get_varint64(&mut input, &mut file_size)
&& get_internal_key(&mut input, &mut smallest_key)
&& get_internal_key(&mut input, &mut largest_key)
{
let mut meta = FileMetaData::default();
meta.set_number(file_number);
meta.set_file_size(file_size);
meta.set_smallest(smallest_key.clone());
meta.set_largest(largest_key.clone());
debug!(
"VersionEdit::decode_from: parsed new file level={} number={} size={}",
file_level,
file_number,
file_size
);
self.new_files_mut().push((file_level, meta));
} else {
msg = Some("new-file entry");
}
}
_ => {
msg = Some("unknown tag");
}
}
}
if msg.is_none() && !input.empty() {
msg = Some("invalid tag");
}
if let Some(reason) = msg {
error!(
"VersionEdit::decode_from: manifest record corruption: {}",
reason
);
let context_slice = Slice::from("manifest parse error".as_bytes());
let reason_slice = Slice::from(reason.as_bytes());
Status::corruption(&context_slice, Some(&reason_slice))
} else {
trace!("VersionEdit::decode_from: decode completed successfully");
Status::ok()
}
}
}
#[cfg(test)]
mod version_edit_decode_from_tests {
use super::*;
#[traced_test]
fn decode_from_reports_corruption_for_truncated_comparator_name() {
trace!(
"decode_from_reports_corruption_for_truncated_comparator_name: start"
);
// Tag 1 (kComparator) followed by length=3 but only 2 bytes payload.
let mut bytes = Vec::new();
bytes.push(1u8); // tag kComparator
bytes.push(3u8); // length = 3
bytes.push(b'a');
bytes.push(b'b');
let slice = unsafe { Slice::from_ptr_len(bytes.as_ptr(), bytes.len()) };
let mut edit = VersionEdit::default();
let status = edit.decode_from(&slice);
assert!(
status.is_corruption(),
"DecodeFrom should return Corruption for truncated comparator payload, got: {}",
status.to_string()
);
}
#[traced_test]
fn decode_from_reports_corruption_for_invalid_varint_tag_encoding() {
trace!(
"decode_from_reports_corruption_for_invalid_varint_tag_encoding: start"
);
// A single byte 0x80 encodes a varint with continuation bit set but no
// following byte. get_varint32 will fail and we should surface Corruption.
let bytes = vec![0x80u8];
let slice = unsafe { Slice::from_ptr_len(bytes.as_ptr(), bytes.len()) };
let mut edit = VersionEdit::default();
let status = edit.decode_from(&slice);
assert!(
status.is_corruption(),
"DecodeFrom should return Corruption for invalid varint tag encoding, got: {}",
status.to_string()
);
}
}