v2.1.3

zupt v2.1.3 ☕ Caffeine Master! - 2026-04-11

Highlights

• Shared write_enc_header() eliminates format mismatches across all encryption paths.
• Solid compression now fully supports PQ encryption.
• Disk restore rewritten with block device O_SYNC I/O.
• LZHP disk backups now correctly apply prediction encoding to prevent silent data corruption.

Fixed

1. LZHP Prediction Encoding in Disk Backup

• Fixed zupt_disk_backup() skipping the zupt_predict_encode() step for byte-prediction (pred_active=1).
• Ensures correct prediction encoding before compression to prevent corruption on restore.
• Allocates temporary buffer for prediction-encoded data and frees it after compression.

2. Spurious SOLID Flag on Disk Archives

• Disk backup archives no longer incorrectly set ZUPT_FLAG_SOLID.
• Each block archive is independent, avoiding extraction issues.

3. Shared Encryption Header

• write_enc_header() extracted as shared function used by:
  • `zupt_compress_fiprediction encoding to prevent silent data corruption.

Fixed

1. LZHP Prediction Encoding in Disk Backup

• Fixed zupt_disk_backup() skipping the zupt_predict_encode() step for byte-prediction (pred_active=1).
• Ensures correct prediction encoding before compression to prevent corruption on restore.
• Allocates temporary buffer for prediction-encoded data and frees it after compression.

2. Spurious SOLID Flag on Disk Archives

• Disk backup archives no longer incorrectly set ZUPT_FLAG_SOLID.
• Each block archive is independent, avoiding extraction issues.

3. Shared Encryption Header

• write_enc_header() extracted as shared function used by:
  • zupt_compress_files()
  • zupt_compress_solid()
  • zupt_disk_backup()
• Eliminates mismatches between different encryption paths.

4. Block Device Restore I/O

• Uses POSIX raw I/O (open() + write() loop) with O_SYNC, fsync() + sync() for reliable block writes.

5. Build Fixes for Termux/Android

• Improved architecture detection using $(CC) -dumpmachine with fallback to uname -m.

6. Public API Adjustments

• zupt_w8(), zupt_w16le(), zupt_w64le() now non-static for shared usage.

Tests

• 78 total: 70 core, 8 disk (including LZHP+PQ+password on ext4).
• ASAN + UBSan run clean, confirming data integrity and memory safety.les()`
  • zupt_compress_solid()
  • zupt_disk_backup()
• Eliminates mismatches between different encryption paths.