var packets = {
    // Unused in SkyFire, intended for auth verification.
    CMSG_AUTH_SESSION: {
        digest: 7+4+1+8+4+1+1+2, seed: u32, digest2: 4+6,
        build: u16, digest3: 1+1+4+2,
        addonTable: array(u32, u8), account: cString
    },
    CMSG_CHAR_ENUM: {},
    CMSG_PLAYER_LOGIN: GUID,
    CMSG_MESSAGECHAT_SAY: {lang: u32, msg: cString},
    CMSG_MESSAGECHAT_WHISPER: {lang: u32, message: cString, name: cString},
    CMSG_GOSSIP_HELLO: {guid: GUID},
    CMSG_QUESTGIVER_HELLO: {guid: GUID},
    CMSG_QUESTGIVER_ACCEPT_QUEST: {guid: GUID, quest: u32, unk: u32},
    CMSG_QUESTGIVER_QUERY_QUEST: {guid: GUID, quest: u32, unk: u8},
    CMSG_QUESTGIVER_CHOOSE_REWARD: {guid: GUID, quest: u32, reward: u32},
    CMSG_QUESTGIVER_REQUEST_REWARD: {guid: GUID, quest: u32},
    CMSG_QUESTGIVER_CANCEL: {},
    CMSG_QUESTGIVER_COMPLETE_QUEST: {guid: GUID, quest: u32, unk: u8},
    CMSG_QUESTGIVER_STATUS_MULTIPLE_QUERY: {},
    CMSG_QUEST_QUERY: u32,
    CMSG_QUEST_COMFIRM_ACCEPT: {quest: u32},
    CMSG_START_QUEST: {unk: u32, quest: u32},

    MSG_LIST_STABLED_PETS: {guid: GUID, $num: u8, unk: u8, pets: array('$num', {
        slot: u8, number: u32, entry: u32,
        level: u16, name: cString, stable: u8
    })},

    // Unused in SkyFire, intended for auth verification.
    SMSG_AUTH_CHALLENGE: {seed1: 16, unk: u8, seed: u8, seed2: 16},
    SMSG_AUTH_RESPONSE: {
        code: u8,
        billingTimeRemaining: u32, billingPlanFlags: u8, billingTimeRested: u32,
        clientExpansion: u8, serverExpansion: u8
    },
    SMSG_CHAR_ENUM: array(u8, {
        guid: GUID,
        name: cString,
        race: u8, class: u8, gender: u8,
        skin: u8, face: u8, hairStyle: u8, hairColor: u8, facialHair: u8,
        level: u8,
        zone: u32, map: u32,
        x: float, y: float, z: float,
        guild: GUID,
        flags: u32,
        customize: u32,
        firstLogin: u8,
        petDisplayID: u32, petLevel: u32, petFamily: u32,
        equipment: array(19, filter({displayInfoID: u32, inventoryType: u8, enchant: u32}, function(x) {
            return x.displayInfoID ? x : null;
        })),
        //HACK Not filled in SkyFire.
        $bags: array(4, {displayInfoID: u32, inventoryType: u8, enchant: u32})
    }),
    SMSG_INITIALIZE_FACTIONS: array(u32, filter({flags: u8, standing: u32}, function(x) {
        return x.flags ? x : null;
    })),
    SMSG_ACTION_BUTTONS: {type: u8,
        butons: eq('type', 2, null, array(wow.MAX_ACTION_BUTTONS, filter(u32, function(x) {
            return x || null;
        })))
    },
    SMSG_EQUIPMENT_SET_LIST: array(u32, {
        guid: packGUID, idx: u32, name: cString, iconName: cString,
        slots: array(19, packGUID)
    }),
    SMSG_INIT_WORLD_STATES: {map: u32, zone: u32, area: u32, fields: array(filter(u16, function(x) {
        // HACK SkyFire sends num=8 for 5 fields.
        return Math.min(x, Math.floor((this._stream._buffer.length-this._stream._pos)/8));
    }), [u32, u32])},
    SMSG_UPDATE_WORLD_STATE: [u32, u32],
    SMSG_LEARNED_DANCE_MOVES: u64,
    SMSG_PLAY_SOUND: u32,
    SMSG_EMOTE: {anim: u32, guid: GUID},
    SMSG_WEATHER: {state: u32, grade: float, unk: u8},
    SMSG_MOTD: /*lines*/array(u32, cString),
    SMSG_GOSSIP_MESSAGE: {
        guid: GUID, menuID: u32, titleTextID: u32,
        menus: array(u32, {id: u32, icon: u8, isCoded: bool, boxMoney: u32, message: cString, boxMessage: cString}),
        quests: array(u32, {id: u32, icon: u32, level: i32, flags: u32, unk: u8, title: cString})
    },
    SMSG_GOSSIP_COMPLETE: {},
    SMSG_QUESTGIVER_QUEST_DETAILS: {
        guid: GUID, unk1: u64, id: u32,
        title: cString, details: cString, objectives: cString,
        targetText: cString, targetName: cString, unk2: u16, targetDisplayID: u32,
        unk3: u32, autoFinish: bool, flags: u32, suggestedPlayers: u32,
        unk4: u8, questStartType: u8, requiredSpell: u32,
        rewardChoicesCount: u32, rewardChoices: array(wow.QUEST_REWARD_CHOICES_COUNT, {itemID: u32, count: u32, displayID: u32}),
        rewardsCount: u32, rewards: array(wow.QUEST_REWARDS_COUNT, {itemID: u32, count: u32, displayID: u32}),
        rewardMoney: u32, xp: u32, charTitleID: u32, unk5: [u32, u32],
        bonusTalents: u32, unk6: [u32, u32],
        reputations: array(wow.QUEST_REPUTATIONS_COUNT, {faction: u32, valueID: i32, value: i32}),
        rewardSpellCast: i32, unk7: u32,
        currencies: array(wow.QUEST_CURRENCY_COUNT, {id: u32, count: u32}),
        unk8: [u32, u32],
        emotes: array(u32, {emote: u32, delay: u32})
    },
    SMSG_QUESTGIVER_OFFER_REWARD: {
        guid: GUID, id: u32,
        title: cString, offerReward: cString,
        questGiverTextWindow: cString, questGiverName: cString,
        questCompleteTextWindow: cString, questCompleteName: cString,
        questGiverPortrait: u32, questTurnInPortrait: u32,
        autoFinish: bool, flags: u32, suggestedPlayers: u32,
        emotes: array(u32, {delay: u32, emote: u32}),
        rewardChoicesCount: u32, rewardChoices: array(wow.QUEST_REWARD_CHOICES_COUNT, {itemID: u32, count: u32, displayID: u32}),
        rewardsCount: u32, rewards: array(wow.QUEST_REWARDS_COUNT, {itemID: u32, count: u32, displayID: u32}),
        rewardMoney: u32, xp: u32, charTitleID: u32, unk1: [u32, u32],
        bonusTalents: u32, unk2: [u32, u32],
        reputations: array(wow.QUEST_REPUTATIONS_COUNT, {faction: u32, valueID: i32, value: i32}),
        rewardSpellCast: i32, unk3: u32,
        currencies: array(wow.QUEST_CURRENCY_COUNT, {id: u32, count: u32}),
        unk4: [u32, u32]
    },
    SMSG_QUESTGIVER_STATUS: {guid: GUID, status: u32},
    SMSG_QUESTGIVER_STATUS_MULTIPLE: array(u32, {guid: GUID, status: u32}),
    SMSG_TALENTS_INFO: {
        pet: bool,
        unspent: u32,
        talents: eq('pet', true, array(u8, {id: u32, rank: u8})),
        $numSpecs: eq('pet', false, u8),
        active: eq('pet', false, u8),
        specs: eq('pet', false, array('$numSpecs', {
            tree: u32,
            talents: array(u8, {id: u32, rank: u8}),
            glyphs: array(u8, u16)
        }))
    },
    SMSG_POWER_UPDATE: {guid: packGUID, powers: array(u32, {power: u8, val: u32})},
    SMSG_AURA_UPDATE: {target: packGUID,
        slot: u8, id: u32,
        $: eq('id', 0, null, join({
            flags: u8, level: u8, stack: u8,
            //NOTE this looks rather anti-logical, maybe SkyFire is wrong.
            caster: flag(wow.auraFlag.CASTER, null, packGUID),
            maxDuration: flag(wow.auraFlag.DURATION, u32),
            duration: flag(wow.auraFlag.DURATION, u32),
            effectAmounts: flag(wow.auraFlag.ANY_EFFECT_AMOUNT_SENT, _(function(update) {
                var amounts = [];
                for(var i = 0; i < wow.MAX_SPELL_EFFECTS; i++)
                    if(update.flags & (i << i))
                        amounts[i] = this.read(u32);
                return amounts;
            }))
        }))
    },
    SMSG_THREAT_UPDATE: {guid: packGUID, threats: array(u32, {guid: packGUID, threat: filter(u32, function(x) {return x/100;}, function(x) {return Math.floor(x*100);})})},
    SMSG_HIGHEST_THREAT_UPDATE: {guid: packGUID, target: packGUID, threats: array(u32, {guid: packGUID, threat: u32})},
    SMSG_AI_REACTION: {guid: GUID, type: u32},
    SMSG_ATTACKSTART: {guid: GUID, victim: GUID},
    SMSG_SPELL_START: {
        source: packGUID, caster: packGUID, castCount: u8,
        id: u32, flags: u32, timer: i32,
        power: flag(wow.castFlag.POWER_LEFT_SELF, u32),
        runes: flag(wow.castFlag.RUNE_LIST, {
            before: u8, after: u8,
            cooldowns: array(wow.MAX_RUNES, filter(u8, function(x) {return x/255;}, function(x) {return Math.floor(x*255);}))
        }),
        unk_23: flag(wow.castFlag.UNKNOWN_23, [u32, u32])
    },
    SMSG_DESTROY_OBJECT: {guid: GUID, animated: bool}
};