evrFileTools

evrFileTools

A Go toolkit for working with EVR (Echo VR) package and manifest files.

Thanks to Exhibitmark for carnation which helped with reversing the manifest format!

Features

• Extract files from EVR packages
• Build new packages from extracted files
• Analyze and diff manifests
• Inventory extracted assets by type
• Compute and reverse-lookup EVR symbol hashes
• Full texture conversion pipeline: DDS <-> PNG with BC1/BC3 compression
• Display and export tint color data as CSS
• ZSTD compression/decompression with optimized context reuse

Installation

Requirements

• Go 1.24 or later
• libsquish (optional, for PNG -> DDS encoding in texconv)
  • Ubuntu/Debian: sudo apt-get install libsquish-dev
  • Arch Linux: sudo pacman -S libsquish
  • macOS: brew install squish

Install via Go

go install github.com/EchoTools/evrFileTools/cmd/evrtools@latest
go install github.com/EchoTools/evrFileTools/cmd/showtints@latest
go install github.com/EchoTools/evrFileTools/cmd/texconv@latest
go install github.com/EchoTools/evrFileTools/cmd/symhash@latest

Build from Source

git clone https://github.com/EchoTools/evrFileTools.git
cd evrFileTools
make build

Binaries are output to the bin/ directory.

Usage

evrtools - Package Management

Extract files from a package

evrtools -mode extract \
    -data ./ready-at-dawn-echo-arena/_data/5932408047/rad15/win10 \
    -package 48037dc70b0ecab2 \
    -output ./extracted

Output structure: ./output/<typeSymbol>/<fileSymbol>

With -preserve-groups: ./output/<frameIndex>/<typeSymbol>/<fileSymbol>

Build a package from files

evrtools -mode build \
    -input ./files \
    -output ./output \
    -package mypackage

Expected input structure: ./input/<frameIndex>/<typeSymbol>/<fileSymbol>

Analyze extracted assets

# Inventory: count files and sizes by type
evrtools -mode inventory -input ./extracted

# Analyze: detect file formats via magic bytes + entropy
evrtools -mode analyze -input ./extracted

# Diff: compare two manifests
evrtools -mode diff \
    -data ./path/to/_data \
    -manifest-a package_a \
    -manifest-b package_b

symhash - Symbol Hash Tool

Compute and reverse-lookup EVR symbol hashes:

# Hash a symbol name
symhash mySymbolName

# Reverse-lookup from a hash
symhash -reverse 0xbeac1969cb7b8861

# Use a wordlist for reverse lookups
symhash -reverse 0xbeac1969cb7b8861 -wordlist symbols.txt

# Use SNS message hash algorithm
symhash -algo sns SNSLobbySmiteEntrant

showtints - Tint Color Display

# Show all tints with details
showtints ./extracted

# Export tints as CSS custom properties
showtints --css --known ./extracted > tints.css

# Show summary only
showtints --summary ./extracted

texconv - Texture Converter

# Decode DDS to PNG for editing
texconv decode texture.dds texture.png

# Encode PNG back to DDS with automatic format detection
texconv encode texture.png texture.dds

# Show texture information
texconv info texture.dds

# Batch convert directory
texconv batch decode _extracted/ png_output/
texconv batch encode png_input/ dds_output/

Supported formats: BC1 (DXT1), BC3 (DXT5), BC5 (partial), BC6H/BC7 (decode only).

CLI Reference

evrtools flags

showtints flags

texconv commands

Project Structure

evrFileTools/
├── cmd/
│   ├── evrtools/        # Package extract/build/analyze CLI
│   ├── showtints/       # Tint display and CSS export CLI
│   ├── symhash/         # Symbol hash computation CLI
│   └── texconv/         # DDS <-> PNG texture converter
├── pkg/
│   ├── archive/         # ZSTD archive format (header, reader, writer)
│   ├── manifest/        # EVR manifest parsing, package extraction, building
│   ├── hash/            # EVR symbol hash algorithms (CSymbol64, SNSMessage)
│   ├── naming/          # Type symbol mappings and asset name resolution
│   ├── texture/         # Texture metadata and DDS conversion
│   ├── audio/           # Audio format detection
│   ├── tint/            # Tint color parsing and CSS export
│   └── asset/           # Asset reference structures
├── docs/                # Format specifications and research
├── CONTRIBUTING.md      # Development guidelines, commit conventions
├── LICENSE              # MIT License
├── Makefile
└── go.mod

Development

make build          # Build all CLI tools
make test           # Run all tests
make check          # Format, vet, and test
make bench          # Run benchmarks
make clean          # Remove build artifacts
make install        # Install all CLI tools via go install

See CONTRIBUTING.md for commit conventions, versioning policy, and code style guidelines.

Documentation

• ASSET_FORMATS.md - Binary format specifications
• IMPLEMENTATION_SUMMARY.md - Design overview
• TEXTURE_FORMAT_VERIFIED.md - Texture format analysis
• LEVEL_FORMAT_INVESTIGATION.md - Level format research

License

MIT License - see LICENSE