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use crate::{
metadata::{
tables::{EventPtrRaw, RowReadable, TableId, TableInfoRef},
token::Token,
},
utils::read_le_at_dyn,
Result,
};
impl RowReadable for EventPtrRaw {
const TABLE_ID: TableId = TableId::EventPtr;
/// Read an `EventPtr` row from the metadata tables stream
///
/// Parses one `EventPtr` table row from the binary metadata stream, handling
/// variable-size indexes based on table size information. Advances the offset
/// to point to the next row after successful parsing.
///
/// # Arguments
///
/// * `data` - The metadata tables stream binary data
/// * `offset` - Current position in the stream (updated after reading)
/// * `rid` - Row identifier for this `EventPtr` entry (1-based)
/// * `sizes` - Table size information for determining index sizes
///
/// # Returns
///
/// Returns a parsed [`EventPtrRaw`] instance with all fields populated
/// from the binary data.
///
/// # Errors
///
/// - The data stream is truncated or corrupted
/// - Event index values exceed expected ranges
/// - Binary parsing encounters invalid data
fn row_read(data: &[u8], offset: &mut usize, rid: u32, sizes: &TableInfoRef) -> Result<Self> {
Ok(EventPtrRaw {
rid,
token: Token::new(0x1300_0000 + rid),
offset: *offset,
event: read_le_at_dyn(data, offset, sizes.is_large(TableId::Event))?,
})
}
}
#[cfg(test)]
mod tests {
use std::sync::Arc;
use super::*;
use crate::metadata::tables::{MetadataTable, TableId, TableInfo};
#[test]
fn crafted_short() {
let data = vec![
0x01, 0x01, // event (index into Event table)
];
let sizes = Arc::new(TableInfo::new_test(
&[(TableId::Event, 1)],
false,
false,
false,
));
let table = MetadataTable::<EventPtrRaw>::new(&data, 1, sizes).unwrap();
let eval = |row: EventPtrRaw| {
assert_eq!(row.rid, 1);
assert_eq!(row.token.value(), 0x13000001);
assert_eq!(row.event, 0x0101);
};
{
for row in table.iter() {
eval(row);
}
}
{
let row = table.get(1).unwrap();
eval(row);
}
}
#[test]
fn crafted_long() {
let data = vec![
0x01, 0x01, 0x01, 0x01, // event (index into Event table)
];
let sizes = Arc::new(TableInfo::new_test(
&[(TableId::Event, u16::MAX as u32 + 3)],
true,
true,
true,
));
let table = MetadataTable::<EventPtrRaw>::new(&data, 1, sizes).unwrap();
let eval = |row: EventPtrRaw| {
assert_eq!(row.rid, 1);
assert_eq!(row.token.value(), 0x13000001);
assert_eq!(row.event, 0x01010101);
};
{
for row in table.iter() {
eval(row);
}
}
{
let row = table.get(1).unwrap();
eval(row);
}
}
}