Cruising the spell cache from memory

[amadmonk]

Sorry for first post, lil problem with my marshalling (ooopsy). Here's working code.

If folks can contribute to the layout of the SpellInfo struct, that would be very helpful.

    [StructLayout(LayoutKind.Explicit, Size = (int)ObjectOffsets.DBSpellCache_BlockSize)]
    public class SpellInfo
    {
        [FieldOffset(0x238)]
        IntPtr _nameBytes;

        // note that I should decode these as UTF-8 since they're not technically ANSI, but that's a ton more work.  Why doesn't Marshal.PtrToString take a Text.Encoding object??
        public string Name
        {
            get
            {
                return Marshal.PtrToStringAnsi(_nameBytes);
            }
        }

        [FieldOffset(0x23c)]
        public IntPtr _secondaryNameBytes;

        public string SecondaryName
        {
            get
            {
                return Marshal.PtrToStringAnsi(_secondaryNameBytes);
            }
        }

        [UnmanagedFunctionPointer(CallingConvention.ThisCall)]
        delegate bool GetCachedSpellInfo(IntPtr spellCache, int spellID, IntPtr buffer);
        static GetCachedSpellInfo s_getCachedSpellInfo = null;

        public static SpellInfo GetSpellInfo(int spellID)
        {
            if (s_getCachedSpellInfo == null)
            {
                s_getCachedSpellInfo = Utilities.RegisterDelegate<GetCachedSpellInfo>((IntPtr)GlobalOffsets.DBSpellCache_GetInfoBlockByID);
            }

            IntPtr DBSpellCache = (IntPtr)GlobalOffsets.DBSpellCache;
            IntPtr buffer = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(SpellInfo)));
            try
            {
                if (s_getCachedSpellInfo(DBSpellCache, spellID, buffer))
                {
                    return (SpellInfo)Marshal.PtrToStructure(buffer, typeof(SpellInfo));
                }
                else
                {
                    return null;
                }
            }
            finally
            {
                Marshal.FreeHGlobal(buffer);
            }
        }
    }

Relevant offsets:

        CGSpell__CreateSpellLink = 0x005B4280, // 3.3.0 (RE: look for the spell link string (aSHspellDHSHS)
        DBSpellCache_GetInfoBlockByID = 0x00476630, // 3.3.0 (RE: second call in CGSpell__CreateSpellLink)
        DBSpellCache = 0x00A751FC, // 3.3.0 (RE: move ecx, [static] right before GetInfoBlockByID in CreateSpellLink above)
        DBSpellCache_BlockSize = 0x2c0, // see DBSpellCache_GetInfoBlockByID, the only call, 2nd param)

[Apoc]

Sorry for first post, lil problem with my marshalling (ooopsy). Here's working code.

If folks can contribute to the layout of the SpellInfo struct, that would be very helpful.

    [StructLayout(LayoutKind.Explicit, Size = (int)ObjectOffsets.DBSpellCache_BlockSize)]
    public class SpellInfo
    {
        [FieldOffset(0x238)]
        IntPtr _nameBytes;

        // note that I should decode these as UTF-8 since they're not technically ANSI, but that's a ton more work.  Why doesn't Marshal.PtrToString take a Text.Encoding object??
        public string Name
        {
            get
            {
                return Marshal.PtrToStringAnsi(_nameBytes);
            }
        }

        [FieldOffset(0x23c)]
        public IntPtr _secondaryNameBytes;

        public string SecondaryName
        {
            get
            {
                return Marshal.PtrToStringAnsi(_secondaryNameBytes);
            }
        }

        [UnmanagedFunctionPointer(CallingConvention.ThisCall)]
        delegate bool GetCachedSpellInfo(IntPtr spellCache, int spellID, IntPtr buffer);
        static GetCachedSpellInfo s_getCachedSpellInfo = null;

        public static SpellInfo GetSpellInfo(int spellID)
        {
            if (s_getCachedSpellInfo == null)
            {
                s_getCachedSpellInfo = Utilities.RegisterDelegate<GetCachedSpellInfo>((IntPtr)GlobalOffsets.DBSpellCache_GetInfoBlockByID);
            }

            IntPtr DBSpellCache = (IntPtr)GlobalOffsets.DBSpellCache;
            IntPtr buffer = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(SpellInfo)));
            try
            {
                if (s_getCachedSpellInfo(DBSpellCache, spellID, buffer))
                {
                    return (SpellInfo)Marshal.PtrToStructure(buffer, typeof(SpellInfo));
                }
                else
                {
                    return null;
                }
            }
            finally
            {
                Marshal.FreeHGlobal(buffer);
            }
        }
    }

Relevant offsets:

        CGSpell__CreateSpellLink = 0x005B4280, // 3.3.0 (RE: look for the spell link string (aSHspellDHSHS)
        DBSpellCache_GetInfoBlockByID = 0x00476630, // 3.3.0 (RE: second call in CGSpell__CreateSpellLink)
        DBSpellCache = 0x00A751FC, // 3.3.0 (RE: move ecx, [static] right before GetInfoBlockByID in CreateSpellLink above)
        DBSpellCache_BlockSize = 0x2c0, // see DBSpellCache_GetInfoBlockByID, the only call, 2nd param)

Edit; I just noticed. That's not the cache. That's the DBC stuff.

Lol.

You're actually calling ClientDb_GetLocalizedRow and passing the [pSpellDbc-0x18] pointer to it.

I think I posted DBC stuff before; if not; I'll post it in elite.

[amadmonk]

Edit; I just noticed. That's not the cache. That's the DBC stuff.

Lol.

You're actually calling ClientDb_GetLocalizedRow and passing the [pSpellDbc-0x18] pointer to it.

I think I posted DBC stuff before; if not; I'll post it in elite.

Erm, yeah, naming mismatch there. I'll use the search for the DBC info.

Cache is just for net-dynamic stuff (player names, etc.), right? As you can tell, I've gone a long time without needing to touch anything in the MPQ's...

[Apoc]

Erm, yeah, naming mismatch there. I'll use the search for the DBC info.

Cache is just for net-dynamic stuff (player names, etc.), right? As you can tell, I've gone a long time without needing to touch anything in the MPQ's...

Yes; cache is for net-dynamic stuff.

You're looking at the Spell.dbc, which needs to be 'localized' in WoW. (It's the only one with that treatment as far as I can tell)

I'll post my current stuff in elite so you can get a head start.

[amadmonk]

Cool, thanks. Feel free to lock this if it's a dupe. If I'd have scanned the info thread for my "newly discovered" offset at 0x00476630, I could have saved myself some time...

[Apoc]

Posted it in elite; I'll leave this thread open for people who want to figure it out for themselves.