Update documentation for v1.1.0 release: enhance README, RELEASE_NOTES, architecture, and copilot instructions; include new features like solid compression, recovery records, and multi-threading.

Author: DevaanshPathak

.github/copilot-instructions.md

@@ -4,6 +4,8 @@
 
 TechCompressor is a **production-ready (v1.1.0)** modular Python compression framework with three algorithms (LZW, Huffman, DEFLATE), AES-256-GCM encryption, TCAF v2 archive format with recovery records, CLI, and GUI. Development is complete with 152 passing tests (2 skipped).
 
+**Target**: Python 3.10+ | **Status**: Production/Stable | **License**: MIT
+
 ## New in v1.1.0
 - **Dictionary Persistence**: Solid compression mode now preserves LZW dictionaries between files for 10-30% better ratios
 - **Recovery Records**: PAR2-style Reed-Solomon error correction for archive repair (configurable 0-10% redundancy)
@@ -121,10 +123,21 @@ Standalone performance testing script with multiple data types:
 - **Output format**: Pretty-printed tables with size/time comparisons
 - Run directly: `python bench.py` (no CLI integration needed)
 
+### Recovery Module (`techcompressor/recovery.py`) - v1.1.0
+PAR2-style error correction for archive repair:
+- **Reed-Solomon Implementation**: `ReedSolomonSimple` class with XOR-based parity
+- **Block-based Recovery**: 64KB blocks with configurable parity (0-10% redundancy)
+- **Archive Integration**: Recovery footer appended to TCAF v2 archives (TCRR marker)
+- **Functions**: `generate_recovery_records()`, `apply_recovery()`, `verify_recovery()`
+- **Critical**: Can recover from single-block corruption; multi-block requires more parity
+
 ### GUI (`techcompressor/gui.py`)
 Tkinter multi-tab interface with **background threading** (lines 23-32):
 - Uses `ThreadPoolExecutor` + `queue.Queue` for non-blocking operations
 - Progress polling via `_poll_progress()` method (updates UI without freezing)
+- **Thread-safety rule**: ALL widget updates MUST use `.after(0, callback)` - never modify widgets from worker threads
+- Progress callbacks: GUI expects `(percent: float, message: str)` format, archiver provides `(current: int, total: int)` - GUI adapts these
+- Keyboard shortcuts: Ctrl+Shift+C (compress), Ctrl+Shift+E (extract)
 ## TechCompressor — AI contributor quick guide
 
 This repository is a production Python compression tool (LZW, Huffman, DEFLATE) with
@@ -164,6 +177,52 @@ When changing behavior, follow this checklist:
 4. If adding new archive format or magic bytes, register a unique 4-byte header and add tests.
 5. Update `techcompressor/__init__.py` and `pyproject.toml` together when bumping versions.
 
+## ⚠️ CRITICAL: Release Documentation Checklist
+
+**BEFORE suggesting a release or running build_release.ps1, ALWAYS update these files:**
+
+1. **README.md**:
+   - Version badge (line 3): `[![Version](https://img.shields.io/badge/version-X.X.X-blue.svg)]`
+   - Test count badge (line 6): `[![Tests](https://img.shields.io/badge/tests-XXX%20passed-brightgreen.svg)]`
+   - Feature descriptions (add new v1.X.X features under "✨ Features")
+   - Python API examples (update function signatures with new parameters)
+   - Comparison table (update with new features vs competitors)
+
+2. **RELEASE_NOTES.md**:
+   - Update version in title: `# TechCompressor vX.X.X Release Notes`
+   - Update release date: `**Release Date**: Month DD, YYYY`
+   - Add "What's New in vX.X.X" section with all new features
+   - Update "Migration from vX.Y.Z to vX.X.X" section
+   - Update "Recommended Usage" section with new parameters/features
+   - Update code examples with new function signatures
+
+3. **CHANGELOG.md**:
+   - Add new version section at top with release date
+   - List all Added/Changed/Fixed items in detail
+   - Include performance metrics if applicable
+   - Reference related issue numbers if available
+
+4. **pyproject.toml**:
+   - Update `version = "X.X.X"` (line 7)
+
+5. **techcompressor/__init__.py**:
+   - Update `__version__ = "X.X.X"`
+   - Update `__all__` exports if new public functions added
+
+6. **tests/test_release_smoke.py**:
+   - Update version assertion: `assert techcompressor.__version__ == "X.X.X"`
+
+7. **.github/copilot-instructions.md** (this file):
+   - Update "Project Overview" version number
+   - Update "New in vX.X.X" section
+   - Update API signatures in examples
+
+**DO NOT:**
+- Suggest building or releasing without updating ALL documentation first
+- Tell user "ready for release" until all markdown files are updated
+- Skip updating comparison tables or feature lists
+- Forget to update test count badges after adding new tests
+
 Files to inspect first for most tasks: `techcompressor/core.py`, `archiver.py`, `crypto.py`,
 `cli.py`, `gui.py`, `utils.py`, `bench.py`, `build_release.ps1`, and `tests/`.
 

README.md

@@ -1,11 +1,11 @@
 # TechCompressor
 
-[![Version](https://img.shields.io/badge/version-1.0.0-blue.svg)](https://github.com/DevaanshPathak/TechCompressor)
+[![Version](https://img.shields.io/badge/version-1.1.0-blue.svg)](https://github.com/DevaanshPathak/TechCompressor)
 [![Python](https://img.shields.io/badge/python-3.10+-green.svg)](https://www.python.org/downloads/)
 [![License](https://img.shields.io/badge/license-MIT-orange.svg)](LICENSE)
-[![Tests](https://img.shields.io/badge/tests-137%20passed-brightgreen.svg)](#testing)
+[![Tests](https://img.shields.io/badge/tests-152%20passed-brightgreen.svg)](#testing)
 
-**TechCompressor** is a production-ready, modular Python compression framework featuring multiple algorithms, military-grade encryption, and both CLI and GUI interfaces. Built for performance, security, and ease of use.
+**TechCompressor** is a production-ready, modular Python compression framework featuring multiple algorithms, military-grade encryption, solid compression with dictionary persistence, PAR2-style recovery records, and both CLI and GUI interfaces. Built for performance, security, and RAR-competitive features.
 
 ---
 
@@ -15,6 +15,13 @@
 - **LZW (Lempel-Ziv-Welch)**: Fast dictionary-based compression, ideal for repetitive data
 - **Huffman Coding**: Optimal for data with non-uniform frequency distributions
 - **DEFLATE**: Industry-standard hybrid (LZ77 + Huffman), best overall compression
+- **STORED**: Automatic detection and direct storage of incompressible files
+
+### 🔗 Advanced Archive Features (v1.1.0)
+- **Solid Compression**: Dictionary persistence across files for 10-30% better ratios
+- **Recovery Records**: PAR2-style Reed-Solomon error correction (0-10% redundancy)
+- **Multi-threaded**: Parallel per-file compression for 2-4x faster archives
+- **Smart AUTO mode**: Entropy detection and algorithm selection heuristics
 
 ### 🔒 Military-Grade Encryption
 - **AES-256-GCM**: Authenticated encryption with integrity verification
@@ -23,11 +30,12 @@
 - No backdoors or recovery mechanisms
 
 ### 📦 Archive Management
-- **TCAF Format**: Custom TechCompressor Archive Format
+- **TCAF v2 Format**: Custom TechCompressor Archive Format with backward compatibility
 - Compress entire folders with metadata preservation
 - Supports both per-file and single-stream compression
 - Path traversal protection and security validation
 - Preserves timestamps, permissions, and relative paths
+- Recovery records for archive repair and corruption detection
 
 ### 💻 Dual Interface
 - **CLI**: Full-featured command-line with benchmarking and verification
@@ -101,7 +109,10 @@ create_archive(
     archive_path="backup.tc",
     algo="DEFLATE",
     password="secret",
-    per_file=False  # Single-stream for best compression
+    per_file=False,  # Single-stream for best compression
+    persist_dict=True,  # NEW v1.1.0: Solid compression
+    recovery_percent=5.0,  # NEW v1.1.0: 5% recovery records
+    max_workers=4  # NEW v1.1.0: Parallel compression
 )
 
 # Extract archive
@@ -131,12 +142,15 @@ How does TechCompressor compare to ZIP, RAR, and 7-Zip? Here's a comprehensive b
 | **Compression Algorithms** | LZW, Huffman, DEFLATE | DEFLATE | RAR (proprietary) | LZMA, LZMA2, DEFLATE |
 | **Best Compression Ratio** | ★★★★☆ (99%+ on repetitive) | ★★★☆☆ | ★★★★★ (industry best) | ★★★★★ |
 | **Compression Speed** | ★★★★☆ (3-6 MB/s) | ★★★★☆ | ★★☆☆☆ (slow) | ★★★☆☆ |
+| **Solid Compression** | ✅ v1.1.0 (10-30% better) | ❌ | ✅ | ✅ |
+| **Recovery Records** | ✅ v1.1.0 (PAR2-style) | ❌ | ✅ | ❌ |
+| **Multi-threading** | ✅ v1.1.0 (per-file) | ⚠️ Limited | ✅ | ✅ |
 | **Encryption** | AES-256-GCM (100K iterations) | AES-256 (ZipCrypto weak) | AES-256 | AES-256 |
 | **Smart Storage Mode** | ✅ Auto-detects incompressible | ❌ Always compresses | ✅ | ✅ |
 | **Archive Metadata** | Timestamps, permissions | Timestamps | Full metadata | Full metadata |
 | **Python API** | ✅ Native | ⚠️ Via zipfile | ❌ | ⚠️ Via py7zr |
 | **GUI Included** | ✅ Cross-platform | ❌ OS-dependent | ✅ Commercial | ✅ |
-| **Format Compatibility** | TCAF (custom) | Universal | Universal | Universal |
+| **Format Compatibility** | TCAF v2 (custom) | Universal | Universal | Universal |
 | **Multi-algorithm Choice** | ✅ 3 algorithms + AUTO | ❌ DEFLATE only | ❌ RAR only | ✅ Multiple |
 | **Use Case** | Development, scripting, automation | General purpose | Maximum compression | Open-source alternative |
 

RELEASE_NOTES.md

@@ -1,11 +1,11 @@
-# TechCompressor v1.0.0 Release Notes
+# TechCompressor v1.1.0 Release Notes
 
-**Release Date**: October 25, 2025  
+**Release Date**: October 27, 2025  
 **Status**: Production/Stable
 
 ## Overview
 
-TechCompressor v1.0.0 is a production-ready, modular Python compression framework that brings together three powerful compression algorithms, military-grade encryption, and intuitive interfaces—all in a single package. Whether you're compressing large datasets, securing sensitive archives, or building compression into your applications, TechCompressor provides the tools you need with a clean, well-tested API.
+TechCompressor v1.1.0 brings RAR-competitive features to the production framework: solid compression with dictionary persistence for 10-30% better compression ratios, PAR2-style recovery records for archive repair, and multi-threaded compression support. This release maintains the robust foundation of three compression algorithms, military-grade encryption, and intuitive interfaces while adding advanced archive features that rival commercial tools.
 
 ## Highlights
 
@@ -28,15 +28,39 @@ The custom **TCAF** (TechCompressor Archive Format) supports both per-file and s
 ### ⚡ Production-Ready
 All 137 tests pass. Comprehensive test coverage includes algorithm correctness, encryption validation, archive security, integration workflows, and performance regression checks. The codebase uses modern Python 3.10+ features with full type hints and extensive documentation.
 
-## What's New in v1.0.0
+## What's New in v1.1.0
 
-This is the initial production release, consolidating the project's development history:
-- ✅ Complete algorithm implementations (LZW, Huffman, DEFLATE)
-- ✅ Full encryption and security features
-- ✅ Archive format with metadata preservation
-- ✅ CLI and GUI interfaces with progress tracking
-- ✅ Comprehensive testing and benchmarking
-- ✅ Documentation and developer guides
+### 🔗 Solid Compression Mode (Dictionary Persistence)
+Archive creation now supports persistent LZW dictionaries across multiple files, achieving **10-30% better compression ratios** on archives with similar content:
+- Global dictionary state maintained between files with `persist_dict=True`
+- `reset_solid_compression_state()` function to clear state between archives
+- Automatic dictionary resets prevent memory overflow
+- Ideal for source code repositories, log archives, and document collections
+
+### 🛡️ Recovery Records (PAR2-Style Error Correction)
+Archives can now include **Reed-Solomon parity blocks** for automatic corruption repair:
+- Configurable redundancy: 0-10% of archive size
+- XOR-based block encoding with 64KB block size
+- `generate_recovery_records()` and `apply_recovery()` functions in new `recovery.py` module
+- Recovery footer with `RCVR` marker for backward compatibility
+- Repairs bit rot, transmission errors, and partial media failures
+
+### ⚡ Multi-Threaded Compression
+Parallel per-file compression support via `ThreadPoolExecutor`:
+- `max_workers` parameter in `create_archive()` function
+- 2-4x faster compression on multi-core systems
+- Automatic worker count based on CPU cores when `max_workers=None`
+- Thread-safe progress tracking and error handling
+
+### 📊 API Enhancements
+- **STORED mode** (algorithm ID 0): Direct storage for incompressible files (no expansion)
+- Enhanced AUTO mode: Smart heuristics skip slow algorithms on large files
+- Entropy detection: Automatically detects already-compressed data
+- Updated function signatures maintain backward compatibility
+
+## Breaking Changes
+
+**None** - v1.1.0 is fully backward compatible with v1.0.0. Existing archives decompress correctly, and all v1.0.0 API calls work unchanged.
 
 ## Getting Started
 
@@ -47,8 +71,8 @@ pip install -r requirements.txt
 # Quick compress
 techcompressor compress input.txt output.tc --algo DEFLATE
 
-# Create encrypted archive
-techcompressor create my_folder/ backup.tc --algo DEFLATE --password mypassword
+# Create encrypted archive with recovery records
+techcompressor create my_folder/ backup.tc --algo DEFLATE --password mypassword --recovery-percent 5
 
 # Extract archive
 techcompressor extract backup.tc restored/ --password mypassword
@@ -57,9 +81,30 @@ techcompressor extract backup.tc restored/ --password mypassword
 techcompressor-gui
 ```
 
-## Migration Notes
+## Migration from v1.0.0 to v1.1.0
+
+**API Changes**: None required - all v1.0.0 code works unchanged.
+
+**New Features** (optional adoption):
+```python
+from techcompressor import compress, reset_solid_compression_state
+from techcompressor.archiver import create_archive
+from techcompressor.recovery import generate_recovery_records
+
+# Use solid compression for better ratios
+create_archive("source/", "output.tc", persist_dict=True)
+
+# Add recovery records (5% redundancy)
+create_archive("source/", "output.tc", recovery_percent=5.0)
+
+# Parallel compression
+create_archive("source/", "output.tc", max_workers=4)
+
+# Reset state between archives
+reset_solid_compression_state()
+```
 
-**Not applicable** - this is the initial release. Future versions will maintain backward compatibility with the v1.0.0 API and archive format.
+**Archive Format**: TCAF v2 is backward compatible with v1 archives. Old archives decompress correctly. New features (STORED mode, recovery records) are only used in newly created archives.
 
 ## Known Issues
 
@@ -76,13 +121,19 @@ techcompressor-gui
 **Algorithm Selection**:
 - **General purpose**: DEFLATE (best overall compression)
 - **Speed-critical**: LZW (fastest, lowest memory)
-- **Text/source code**: DEFLATE with single-stream mode
+- **Text/source code**: DEFLATE with single-stream mode + solid compression
 - **Mixed content**: LZW with per-file mode
-- **Media files**: Skip re-compression (already compressed formats)
+- **Media files**: STORED mode automatically used for incompressible data
 
 **Archive Modes**:
-- **Per-file mode**: Better for random access, selective extraction, and mixed content types
-- **Single-stream mode**: Better compression ratio for similar files (e.g., source code)
+- **Per-file mode** (`per_file=True`): Better for random access, selective extraction, mixed content
+- **Single-stream mode** (`per_file=False`): Better compression ratio for similar files
+- **Solid compression** (`persist_dict=True`): 10-30% better ratios, use with per_file=True
+
+**Recovery Records**:
+- Use 2-5% redundancy for normal archives
+- Use 5-10% for critical backups or unreliable media
+- Recovery records add minimal overhead but enable corruption repair
 
 **Security**:
 - Use strong passwords (12+ characters, mixed case, numbers, symbols)

build_release.ps1

@@ -37,7 +37,6 @@ Write-Host ""
 Write-Host "[2/6] Cleaning previous builds..." -ForegroundColor Yellow
 if (Test-Path "build") { Remove-Item -Recurse -Force "build" }
 if (Test-Path "dist") { Remove-Item -Recurse -Force "dist" }
-if (Test-Path "release") { Remove-Item -Recurse -Force "release" }
 Write-Host "✓ Cleaned" -ForegroundColor Green
 
 # Run tests
@@ -77,19 +76,22 @@ if (Test-Path $exePath) {
     exit 1
 }
 
-# Create release package
+# Create release ZIP package
 Write-Host ""
-Write-Host "[6/6] Creating release package..." -ForegroundColor Yellow
-New-Item -ItemType Directory -Force -Path "release" | Out-Null
+Write-Host "[6/6] Creating release ZIP..." -ForegroundColor Yellow
+
+# Create temporary staging directory
+$tempDir = "dist\temp_release"
+New-Item -ItemType Directory -Force -Path $tempDir | Out-Null
 
 # Copy executable
-Copy-Item $exePath "release\"
+Copy-Item $exePath "$tempDir\"
 
 # Copy documentation
-Copy-Item "README.md" "release\"
-Copy-Item "LICENSE" "release\"
-Copy-Item "CHANGELOG.md" "release\"
-Copy-Item "SECURITY.md" "release\"
+Copy-Item "README.md" "$tempDir\"
+Copy-Item "LICENSE" "$tempDir\"
+Copy-Item "CHANGELOG.md" "$tempDir\"
+Copy-Item "SECURITY.md" "$tempDir\"
 
 # Create release README
 $releaseReadme = @"
@@ -136,16 +138,16 @@ MIT License - Free for personal and commercial use
 Copyright (c) 2025 Devaansh Pathak
 "@
 
-$releaseReadme | Out-File -FilePath "release\README_RELEASE.txt" -Encoding UTF8
-
-Write-Host "✓ Release package created in: release\" -ForegroundColor Green
+$releaseReadme | Out-File -FilePath "$tempDir\README_RELEASE.txt" -Encoding UTF8
 
 # Create ZIP for distribution
-Write-Host ""
-Write-Host "Creating ZIP archive for GitHub release..." -ForegroundColor Yellow
 $zipName = "TechCompressor-v$VERSION-Windows-x64.zip"
 $zipPath = "dist\$zipName"
-Compress-Archive -Path "release\*" -DestinationPath $zipPath -Force
+Compress-Archive -Path "$tempDir\*" -DestinationPath $zipPath -Force
+
+# Clean up temp directory
+Remove-Item -Recurse -Force $tempDir
+
 if (Test-Path $zipPath) {
     $zipSize = (Get-Item $zipPath).Length / 1MB
     Write-Host "✓ Release ZIP created: $zipPath ($($zipSize.ToString('F2')) MB)" -ForegroundColor Green
@@ -162,8 +164,7 @@ Write-Host "================================" -ForegroundColor Cyan
 Write-Host ""
 Write-Host "Release files:" -ForegroundColor White
 Write-Host "  • Standalone EXE: dist\TechCompressor.exe" -ForegroundColor White
-Write-Host "  • Release package: release\" -ForegroundColor White
-Write-Host "  • GitHub release: $zipPath" -ForegroundColor White
+Write-Host "  • GitHub release ZIP: $zipPath" -ForegroundColor White
 Write-Host ""
 Write-Host "Next steps:" -ForegroundColor Yellow
 Write-Host "  1. Test the executable: dist\TechCompressor.exe" -ForegroundColor White