Release 0.0.1 - Initial release · diviatrix/GORO-Patcher

This is initial GORO Patcher release.
It works, but this release is for testing purposes and feedback collection.

GRF 2.0 read/write/merge — full format implementation with 46-byte header (rAthena layout), zlib-compressed file table, EUC-KR filename decoding
GRF patching — merge .grf files directly or extract .zip contents into target GRF
Raw patching — extract zip files to game directory with backup support
HTTP downloader — resume support (Range headers), retry with backoff, xxhash64 verification
Self-update — patcher can update itself from manifest
Process detection — checks if game is running before patching
State machine — clean state transitions (idle → checking → downloading → patching → ready/error)
Polling-based progress — real-time progress via GetProgress() bound method
Crash recovery — atomic GRF save, .bak restoration, re-download on hash failure
Auto-check on start — patcher checks for updates automatically on launch
Cross-platform builds — scripts/build.sh (Linux/cross-compile) and scripts/build.bat (native Windows)
Hash tool — hashfile command for generating XXHash64 hashes for manifest
Patch validation — patcher validates applied patches against manifest on start
Repair — redownload and reapply from first mismatching patch when corruption detected

Stack: Go + Wails v3 + vanilla HTML/CSS/JS
GRF format: 46-byte header, FileTableOffset relative to header end (SEEK_CUR), data blocks before file table
Version tracking: patch ID = version, stored in goro-patch.json with patch metadata, no separate version field in manifest
Config: goro-config.json with manifest_url and exe_name
Manifest: plist.json with patch_base_url and patches array
File encoding: EUC-KR filenames decoded to UTF-8 via golang.org/x/text/encoding/korean

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