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rdb.go
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rdb.go
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// Package rdb is a parser for rdb files, a binary database of games with
// metadata also used by RetroArch.
package rdb
import (
"fmt"
"math"
"strconv"
"sync"
)
// DB is a database that contains many RDB, mapped to their system name
type DB map[string]RDB
// RDB contains all the game descriptions for a system
type RDB []Game
// Game represents a game in the libretro database
type Game struct {
Path string
Name string
Description string
Genre string
Developer string
Publisher string
Franchise string
Origin string
Rumble bool
Serial string
ROMName string
ReleaseMonth uint
ReleaseYear uint
Size uint64
CRC32 uint32
System string
}
const (
mpfFixMap = 0x80
mpfMap16 = 0xde
mpfMap32 = 0xdf
mpfFixArray = 0x90
// mpfArray16 = 0xdc
// mpfArray32 = 0xdd
mpfFixStr = 0xa0
mpfStr8 = 0xd9
mpfStr16 = 0xda
mpfStr32 = 0xdb
mpfBin8 = 0xc4
mpfBin16 = 0xc5
mpfBin32 = 0xc6
// mpfFalse = 0xc2
// mpfTrue = 0xc3
// mpfInt8 = 0xd0
// mpfInt16 = 0xd1
// mpfInt32 = 0xd2
// mpfInt64 = 0xd3
mpfUint8 = 0xcc
mpfUint16 = 0xcd
mpfUint32 = 0xce
mpfUint64 = 0xcf
mpfNil = 0xc0
)
// SetField sets a field in the entry
func (g *Game) SetField(key string, value string) {
switch key {
case "name":
g.Name = string(value)
case "description":
g.Description = string(value)
case "genre":
g.Genre = string(value)
case "developer":
g.Developer = string(value)
case "publisher":
g.Publisher = string(value)
case "franchise":
g.Franchise = string(value)
case "origin":
g.Origin = string(value)
case "rumble":
g.Rumble = true
case "serial":
g.Serial = string(value)
case "rom_name":
g.ROMName = string(value)
case "size":
v := fmt.Sprintf("%x", string(value))
u64, _ := strconv.ParseUint(v, 16, 32)
g.Size = u64
case "releasemonth":
v := fmt.Sprintf("%x", string(value))
u64, _ := strconv.ParseUint(v, 16, 32)
g.ReleaseMonth = uint(u64)
case "releaseyear":
v := fmt.Sprintf("%x", string(value))
u64, _ := strconv.ParseUint(v, 16, 32)
g.ReleaseYear = uint(u64)
case "crc":
v := fmt.Sprintf("%x", string(value))
u64, _ := strconv.ParseUint(v, 16, 32)
g.CRC32 = uint32(u64)
}
}
// Parse parses a .rdb file content and returns an array of Entries
func Parse(rdb []byte) RDB {
var output RDB
pos := 0x10
iskey := false
key := ""
g := Game{}
for int(rdb[pos]) != mpfNil {
fieldtype := int(rdb[pos])
var value []byte
if fieldtype < mpfFixMap {
} else if fieldtype < mpfFixArray {
if (g != Game{}) {
output = append(output, g)
}
g = Game{}
pos++
iskey = true
continue
// } else if fieldtype < mpfFixStr {
// len := fieldtype - mpfFixArray
} else if fieldtype < mpfNil {
len := int(rdb[pos]) - mpfFixStr
pos++
value = rdb[pos : pos+len]
pos += len
}
// else if fieldtype > mpfMap32 {
// }
switch fieldtype {
case mpfStr8, mpfStr16, mpfStr32:
pos++
lenlen := fieldtype - mpfStr8 + 1
lenhex := fmt.Sprintf("%x", string(rdb[pos:pos+lenlen]))
i64, _ := strconv.ParseInt(lenhex, 16, 32)
len := int(i64)
pos += lenlen
value = rdb[pos : pos+len]
pos += len
case mpfUint8, mpfUint16, mpfUint32, mpfUint64:
pow := float64(rdb[pos]) - 0xC9
len := int(math.Pow(2, pow)) / 8
pos++
value = rdb[pos : pos+len]
pos += len
case mpfBin8, mpfBin16, mpfBin32:
pos++
len := int(rdb[pos])
pos++
value = rdb[pos : pos+len]
pos += len
case mpfMap16, mpfMap32:
len := 2
if int(rdb[pos]) == mpfMap32 {
len = 4
}
pos++
value = rdb[pos : pos+len]
pos += len
iskey = true
}
if iskey {
key = string(value)
} else {
g.SetField(key, string(value))
}
iskey = !iskey
}
// Don't forget to add the last rdb entry
if (g != Game{}) {
output = append(output, g)
}
return output
}
// FindByCRC loops over the RDBs in the DB and concurrently matches CRC32 checksums.
func (db *DB) FindByCRC(romPath string, romName string, CRC32 uint32, games chan (Game)) {
var wg sync.WaitGroup
wg.Add(len(*db))
// For every RDB in the DB
for system, rdb := range *db {
go func(rdb RDB, CRC32 uint32, system string) {
// For each game in the RDB
for _, game := range rdb {
// If the checksums match
if CRC32 == game.CRC32 {
games <- Game{Path: romPath, ROMName: romName, Name: game.Name, CRC32: CRC32, System: system}
}
}
wg.Done()
}(rdb, CRC32, system)
}
// Synchronize all the goroutines
wg.Wait()
}
// FindByROMName loops over the RDBs in the DB and concurrently matches ROM names.
func (db *DB) FindByROMName(romPath string, romName string, CRC32 uint32, games chan (Game)) {
var wg sync.WaitGroup
wg.Add(len(*db))
// For every RDB in the DB
for system, rdb := range *db {
go func(rdb RDB, CRC32 uint32, system string) {
// For each game in the RDB
for _, game := range rdb {
// If the checksums match
if romName == game.ROMName {
games <- Game{Path: romPath, ROMName: romName, Name: game.Name, CRC32: CRC32, System: system}
}
}
wg.Done()
}(rdb, CRC32, system)
}
// Synchronize all the goroutines
wg.Wait()
}