v0.1.6

Critical performance fix

• Fix copy-on-write behavior that made lazy sector-chain indexing quadratic
• Keep references to the cached chain state while extending it
• Track the chain tail directly instead of copying the growing sector list
• Restore linear scaling for first reads of large streams
• Extend the benchmark to report cold complete-stream extraction before cache warm-up

A 4,366-sector XLS stream measured approximately 7.4x faster with this fix, with identical extracted bytes. The public API is unchanged.

All formatting, static analysis, and PHPUnit checks pass.

v0.1.5

Parser refinements

• Decode CFBF header version and numeric fields in bulk
• Avoid copy-on-write ancestry arrays while indexing the directory tree
• Replace internal chain generators with direct sector lists
• Remove repeated result-length calculations from block-read loops
• Add explicit directory-tree cycle validation coverage

On the PowerPoint chart benchmark, warmed CompoundFile::open() improves by approximately another 8% over v0.1.4. The public API is unchanged.

All formatting, static analysis, and PHPUnit checks pass.

v0.1.4

Parsing performance

• Decode header and extended DIFAT entries in bulk
• Coalesce physical FAT-sector reads and decode the table in one pass
• Decode each 128-byte directory entry with one structured unpack operation
• Reuse decoded FILETIME fields instead of reading them again

On the 766 KiB PowerPoint chart benchmark, warmed CompoundFile::open() improved from approximately 0.147 ms to 0.062 ms best-case. The public API is unchanged.

All formatting, static analysis, and PHPUnit checks pass.

v0.1.3

Performance improvement

• Decode FAT and mini-FAT tables with a single bulk unpack operation
• Preserve little-endian and big-endian allocation table support
• Eliminate per-integer substring and unpack overhead during container parsing

This significantly reduces CompoundFile::open() time, especially for containers with large allocation tables. All formatting, static analysis, and PHPUnit checks pass.

v0.1.2

Performance improvements

• Coalesce contiguous FAT sectors into a single read operation
• Avoid redundant seeks when the underlying resource is already at the requested offset
• Apply coalesced reads during container parsing and stream extraction
• Cover fragmented sector chains with integration tests
• Report complete-stream extraction throughput in the benchmark

All formatting, static analysis, and PHPUnit checks pass.

v0.1.1

What's changed

• Optimize random access with lazily cached FAT and mini-FAT chain indexes
• Preserve inexpensive reads near the beginning of large streams
• Add cross-sector random seek coverage
• Add a reusable Composer benchmark command
• Document performance benchmarking in the README

All formatting, static analysis, and PHPUnit checks pass.

v0.1.0

Initial release.

• CFBF v3/v4 parsing with FAT, DIFAT, and mini-FAT
• Little- and big-endian support
• UTF-16 stream names via mbstring
• Seekable stream API and ole2:// PHP stream wrapper
• Directory traversal and metadata inspection
• PHP 8.1+ with PHPUnit, PHPStan, and CI coverage