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Terraonion

A collection of libraries and utilities for some of the Terraonion products.

Installation:

go get github.com/bodgit/terraonion/...

neosd

The neosd utility creates .neo files suitable for the NeoSD cartridge using a zip archive or directory containing Neo Geo ROM images.

If the base filename, minus any preceding path or extension, matches the name of a game known to MAME then the ROM images will be unscrambled and processed based on the same logic MAME uses. If the game is also a clone of another game then the utility will attempt to find any missing ROM images in a zip archive or directory based on the name of the parent game.

If the game is not known to MAME then the filenames of the individual ROM images are used to try and best work out how to process the game.

A quick demo:

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terraonion's Issues

Segfault on 32-bit ARM

On Linux/armv7l:

# ./neosd convert mslug.zip
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x11fb0]

goroutine 1 [running]:
runtime/internal/atomic.goXadd64(0x256dd0c, 0x400, 0x0, 0x2536400, 0x2536400)
        /usr/lib/go-1.15/src/runtime/internal/atomic/atomic_arm.go:103 +0x1c
github.com/bodgit/plumbing.(*WriteCounter).Write(0x256dd0c, 0x2536400, 0x400, 0x400, 0xc8df76, 0x0, 0x400)
        /root/terraonion/go/pkg/mod/github.com/bodgit/[email protected]/count.go:15 +0x30
github.com/bodgit/plumbing.(*teeReaderAt).ReadAt(0x251e730, 0x2536400, 0x400, 0x400, 0xc8df76, 0x0, 0x22b30, 0x269b4, 0x4)
        /root/terraonion/go/pkg/mod/github.com/bodgit/[email protected]/tee.go:13 +0xa4
archive/zip.readDirectoryEnd(0x31d340, 0x251e730, 0xc8e376, 0x0, 0xb6dac1e8, 0x20, 0xe9)
        /usr/lib/go-1.15/src/archive/zip/reader.go:476 +0x110
archive/zip.(*Reader).init(0x256dd20, 0x31d340, 0x251e730, 0xc8e376, 0x0, 0x282c68, 0x1)
        /usr/lib/go-1.15/src/archive/zip/reader.go:82 +0x34
archive/zip.NewReader(0x31d340, 0x251e730, 0xc8e376, 0x0, 0x0, 0x0, 0x0)
        /usr/lib/go-1.15/src/archive/zip/reader.go:75 +0x84
github.com/bodgit/rom.NewZipReader(0xbe9ede54, 0x9, 0x256dd00, 0x0, 0x0)
        /root/terraonion/go/pkg/mod/github.com/bodgit/[email protected]/reader.go:292 +0x1cc
github.com/bodgit/rom.NewReader(0xbe9ede54, 0x9, 0x259bc0c, 0x2562fa0, 0x261201, 0x7)
        /root/terraonion/go/pkg/mod/github.com/bodgit/[email protected]/reader.go:61 +0x10c
github.com/bodgit/terraonion/neo.(*File).readMameROM(0x25b2000, 0xbe9ede54, 0x9, 0x0, 0x0)
        /root/terraonion/neo/file.go:203 +0x1a8
github.com/bodgit/terraonion/neo.NewFile(0xbe9ede54, 0x9, 0x9, 0x24ba44, 0x438c30)
        /root/terraonion/neo/file.go:105 +0x5c
main.convert(0x256dcc0, 0x7, 0xc)
        /root/terraonion/cmd/neosd/main.go:124 +0x114
github.com/urfave/cli/v2.(*Command).Run(0x25265a0, 0x256da80, 0x0, 0x0)
        /root/terraonion/go/pkg/mod/github.com/urfave/cli/[email protected]/command.go:161 +0x3e8
github.com/urfave/cli/v2.(*App).RunContext(0x252e340, 0x31e780, 0x256f0a0, 0x25140e0, 0x3, 0x4, 0x0, 0x0)
        /root/terraonion/go/pkg/mod/github.com/urfave/cli/[email protected]/app.go:302 +0x608
github.com/urfave/cli/v2.(*App).Run(...)
        /root/terraonion/go/pkg/mod/github.com/urfave/cli/[email protected]/app.go:211
main.main()
        /root/terraonion/cmd/neosd/main.go:225 +0x634

This appears to be caused by a Go bug in 64bit atomic operations on certain 32-bit platforms: golang/go#23345

Quote from sync/atomic bugs section:

On ARM, 386, and 32-bit MIPS, it is the caller's responsibility to arrange for 64-bit alignment of 64-bit words accessed atomically via the primitive atomic functions (types Int64 and Uint64 are automatically aligned). The first word in an allocated struct, array, or slice; in a global variable; or in a local variable (because the subject of all atomic operations will escape to the heap) can be relied upon to be 64-bit aligned.

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