go-stormlib

go-stormlib is a Go implementation of Blizzard MPQ archive handling, with behavior aligned to StormLib where practical and validated by a parity harness against the C reference.

Status

Implemented and usable today:

• Open archives (storm.Open)
• List entries ((*Archive).ListFiles)
• Read by index / hash / name (ReadFileByIndex, ReadFileByHash, ReadFileByName)
• Extract files to disk ((*Archive).ExtractFile, MPQ scope only)
• Create empty archives and write uncompressed single-unit files (Create → CreateFile → WriteFile → FinishFile)
• Remove and rename files (narrow table-update slice)
• UTF-8 filename conversion helpers (UTF8ToFileName, FileNameToUTF8)

Known partial / unsupported:

• Compact, SignArchive return ErrUnsupportedFeature
• Patch-chain merge / read semantics
• A subset of compression combinations (unsupported codecs return typed errors)

Intentional behavior deltas vs StormLib are tracked in docs/compatibility.md.

Installation

go get github.com/ldmonster/go-stormlib

Quick start (read)

package main

import (
    "fmt"
    "log"

    "github.com/ldmonster/go-stormlib/pkg/storm"
)

func main() {
    a, err := storm.Open("example.mpq", storm.OpenOptions{})
    if err != nil {
        log.Fatal(err)
    }
    defer a.Close()

    files, err := a.ListFiles()
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("files: %d\n", len(files))

    data, err := a.ReadFileByName("units\\human\\footman.blp", 0, 0)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("read bytes: %d\n", len(data))
}

Quick start (create + write)

package main

import (
    "log"

    "github.com/ldmonster/go-stormlib/pkg/storm"
)

func main() {
    a, err := storm.Create("new.mpq", storm.CreateOptions{
        ArchiveVersion: 0, // v1
        MaxFileCount:   8,
    })
    if err != nil {
        log.Fatal(err)
    }
    defer a.Close()

    if err := a.CreateFile("hello.txt", uint32(len("hello")), 0); err != nil {
        log.Fatal(err)
    }
    if err := a.WriteFile([]byte("hello")); err != nil {
        log.Fatal(err)
    }
    if err := a.FinishFile(); err != nil {
        log.Fatal(err)
    }
}

Repository layout

Path	Description
pkg/storm	Public Go API. Start here for application-level usage.
internal	Private implementation packages (not importable from outside the module).
internal/archive	MPQ open/read/write/create/compact/patch engine.
internal/mpq	On-disk header, hash/block/HET/BET tables, file-key derivation.
internal/compress	Pure-Go ports of Blizzard codecs (PKWARE explode, Huffman, ADPCM).
internal/naming	UTF-8 ↔ filename helpers (StormLib SMemUtf8).
tools	Out-of-tree binaries and parity tooling.
tools/parity	Parity test suites + drift scripts and the parity-command contract.
tools/paritycmd	stormlib-parity: in-repo Go implementation of the parity contract.
tools/stormlib-parity-c	stormlib-parity-c: native StormLib-backed implementation of the parity contract.
stormlib	Vendored upstream StormLib C/C++ source tree.

Development

This repository ships a Taskfile for the common workflows:

Task	Description
task test	Full local CI: unit tests, race tests, structured & C-backed parity.
task go:test	Run all Go tests.
task go:race	Run race-enabled tests for core packages.
task lint	Run golangci-lint with the repo config.
task parity:build	Build bin/stormlib-parity (Go).
task cparity:build	Build build/stormlib-parity-c (native, with Go fallback).
task parity:structured	Structured parity suite + JSON reports under parity-reports/.
task parity:strict-evidence	Strict subset + evidence artifacts.
task parity:c-backed	Strict suite vs C binary, produce drift diff.
task fuzz:mpq	Run MPQ fuzz targets for ~20s.

task --list enumerates every task.

Parity tooling

Validation against StormLib is built around a small CLI contract (currently v0.1.0-contract1). Two implementations of the contract live in this tree:

• tools/paritycmd — Go (bin/stormlib-parity).
• tools/stormlib-parity-c — native C++ against StormLib (build/stormlib-parity-c).

The same Go test suite under tools/parity drives both, and the drift report between them is the source of truth for behavioral parity.

License

This repository vendors / includes the upstream stormlib source tree. See the project and upstream repository metadata for licensing details.