Struct SegmentTable 

pub struct SegmentTable<'a> { /* private fields */ }

Immutable view over the segment table region of an account.

The table starts at a known offset (typically right after the fixed prefix) and contains segment_count descriptors of 8 bytes each.

Implementations

impl<'a> SegmentTable<'a>

pub fn from_bytes( data: &'a [u8], segment_count: usize, ) -> Result<Self, ProgramError>

Parse a segment table from data.

data should start at the first descriptor byte. segment_count must be ≤ MAX_SEGMENTS.

pub fn len(&self) -> usize

Number of segments in the table.

pub fn is_empty(&self) -> bool

Whether the table has no segments.

pub fn descriptor( &self, index: usize, ) -> Result<SegmentDescriptor, ProgramError>

Get the descriptor at index.

pub fn validate( &self, account_len: usize, expected_sizes: &[u16], min_offset: usize, ) -> Result<(), ProgramError>

Validate that all segments are well-formed within account_len bytes.

min_offset is the earliest byte at which segment data may start (typically DATA_START_OFFSET - after the fixed prefix + table). This prevents segment data from overlapping the fixed prefix or the segment table itself.

Checks:

• Element size matches expected_sizes[i] (if provided).
• Segment data fits within the account.
• No segment data starts before min_offset.
• No two segments overlap.
• All segments are ordered by offset.

pub fn byte_len(&self) -> usize

Total byte size of the table itself (segment_count × 8).