/*
 * Copyright © 2013 Ran Benita
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "config.h"

#include "x11-priv.h"

/*
 * References for the lonesome traveler:
 * Xkb protocol specification:
 *      https://www.x.org/releases/current/doc/kbproto/xkbproto.html
 * The XCB xkb XML protocol file:
 *      /user/share/xcb/xkb.xml
 * The XCB xkb header file:
 *      /usr/include/xcb/xkb.h
 * The old kbproto header files:
 *      /usr/include/X11/extensions/XKB{,proto,str}.h
 * Xlib XKB source code:
 *      <libX11>/src/xkb/XKBGetMap.c (and friends)
 * X server XKB protocol handling:
 *      <xserver>/xkb/xkb.c
 * Man pages:
 *      XkbGetMap(3), XkbGetCompatMap(3), etc.
 */

/* Constants from /usr/include/X11/extensions/XKB.h */
/* XkbNumModifiers. */
#define NUM_REAL_MODS 8u
/* XkbNumVirtualMods. */
#define NUM_VMODS 16u
/* XkbNoModifier. */
#define NO_MODIFIER 0xff
/* XkbNumIndicators. */
#define NUM_INDICATORS 32u
/* XkbAllIndicatorsMask. */
#define ALL_INDICATORS_MASK 0xffffffff

/* Some macros. Not very nice but it'd be worse without them. */

/*
 * We try not to trust the server too much and be paranoid. If we get
 * something which we definitely shouldn't, we fail.
 */
#define STRINGIFY(expr) #expr
#define FAIL_UNLESS(expr) do {                                          \
    if (!(expr)) {                                                      \
        log_err(keymap->ctx,                                            \
                "x11: failed to get keymap from X server: unmet condition in %s(): %s\n", \
                __func__, STRINGIFY(expr));                             \
        goto fail;                                                      \
    }                                                                   \
} while (0)

#define FAIL_IF_BAD_REPLY(reply, request_name) do {                     \
    if (!reply) {                                                       \
        log_err(keymap->ctx,                                            \
                "x11: failed to get keymap from X server: %s request failed\n", \
                (request_name));                                        \
        goto fail;                                                      \
    }                                                                   \
} while (0)

#define ALLOC_OR_FAIL(arr, nmemb) do {                                  \
    if ((nmemb) > 0) {                                                  \
        (arr) = calloc((nmemb), sizeof(*(arr)));                        \
        if (!(arr))                                                     \
            goto fail;                                                  \
    }                                                                   \
} while (0)


static xkb_mod_mask_t
translate_mods(uint8_t rmods, uint16_t vmods_low, uint16_t vmods_high)
{
    /* We represent mod masks in a single uint32_t value, with real mods
     * first and vmods after (though we don't make these distinctions). */
    return
        ((xkb_mod_mask_t) rmods) |
        ((xkb_mod_mask_t) vmods_low << 8) |
        ((xkb_mod_mask_t) vmods_high << 16);
}

static enum xkb_action_controls
translate_controls_mask(uint32_t wire)
{
    enum xkb_action_controls ret = 0;
    if (wire & XCB_XKB_BOOL_CTRL_REPEAT_KEYS)
        ret |= CONTROL_REPEAT;
    if (wire & XCB_XKB_BOOL_CTRL_SLOW_KEYS)
        ret |= CONTROL_SLOW;
    if (wire & XCB_XKB_BOOL_CTRL_BOUNCE_KEYS)
        ret |= CONTROL_DEBOUNCE;
    if (wire & XCB_XKB_BOOL_CTRL_STICKY_KEYS)
        ret |= CONTROL_STICKY;
    if (wire & XCB_XKB_BOOL_CTRL_MOUSE_KEYS)
        ret |= CONTROL_MOUSEKEYS;
    if (wire & XCB_XKB_BOOL_CTRL_MOUSE_KEYS_ACCEL)
        ret |= CONTROL_MOUSEKEYS_ACCEL;
    if (wire & XCB_XKB_BOOL_CTRL_ACCESS_X_KEYS)
        ret |= CONTROL_AX;
    if (wire & XCB_XKB_BOOL_CTRL_ACCESS_X_TIMEOUT_MASK)
        ret |= CONTROL_AX_TIMEOUT;
    if (wire & XCB_XKB_BOOL_CTRL_ACCESS_X_FEEDBACK_MASK)
        ret |= CONTROL_AX_FEEDBACK;
    if (wire & XCB_XKB_BOOL_CTRL_AUDIBLE_BELL_MASK)
        ret |= CONTROL_BELL;
    if (wire & XCB_XKB_BOOL_CTRL_IGNORE_GROUP_LOCK_MASK)
        ret |= CONTROL_IGNORE_GROUP_LOCK;
    /* Some controls are not supported and don't appear here. */
    return ret;
}

static void
translate_action(union xkb_action *action, const xcb_xkb_action_t *wire)
{
    switch (wire->type) {
    case XCB_XKB_SA_TYPE_SET_MODS:
        action->type = ACTION_TYPE_MOD_SET;

        action->mods.mods.mods = translate_mods(wire->setmods.realMods,
                                                wire->setmods.vmodsLow,
                                                wire->setmods.vmodsHigh);
        action->mods.mods.mask = translate_mods(wire->setmods.mask, 0, 0);

        if (wire->setmods.flags & XCB_XKB_SA_CLEAR_LOCKS)
            action->mods.flags |= ACTION_LOCK_CLEAR;
        if (wire->setmods.flags & XCB_XKB_SA_LATCH_TO_LOCK)
            action->mods.flags |= ACTION_LATCH_TO_LOCK;
        if (wire->setmods.flags & XCB_XKB_SA_USE_MOD_MAP_MODS)
            action->mods.flags |= ACTION_MODS_LOOKUP_MODMAP;

        break;
    case XCB_XKB_SA_TYPE_LATCH_MODS:
        action->type = ACTION_TYPE_MOD_LATCH;

        action->mods.mods.mods = translate_mods(wire->latchmods.realMods,
                                                wire->latchmods.vmodsLow,
                                                wire->latchmods.vmodsHigh);
        action->mods.mods.mask = translate_mods(wire->latchmods.mask, 0, 0);

        if (wire->latchmods.flags & XCB_XKB_SA_CLEAR_LOCKS)
            action->mods.flags |= ACTION_LOCK_CLEAR;
        if (wire->latchmods.flags & XCB_XKB_SA_LATCH_TO_LOCK)
            action->mods.flags |= ACTION_LATCH_TO_LOCK;
        if (wire->latchmods.flags & XCB_XKB_SA_USE_MOD_MAP_MODS)
            action->mods.flags |= ACTION_MODS_LOOKUP_MODMAP;

        break;
    case XCB_XKB_SA_TYPE_LOCK_MODS:
        action->type = ACTION_TYPE_MOD_LOCK;

        action->mods.mods.mods = translate_mods(wire->lockmods.realMods,
                                                wire->lockmods.vmodsLow,
                                                wire->lockmods.vmodsHigh);
        action->mods.mods.mask = translate_mods(wire->lockmods.mask, 0, 0);

        if (wire->lockmods.flags & XCB_XKB_SA_ISO_LOCK_FLAG_NO_LOCK)
            action->mods.flags |= ACTION_LOCK_NO_LOCK;
        if (wire->lockmods.flags & XCB_XKB_SA_ISO_LOCK_FLAG_NO_UNLOCK)
            action->mods.flags |= ACTION_LOCK_NO_UNLOCK;
        if (wire->lockmods.flags & XCB_XKB_SA_USE_MOD_MAP_MODS)
            action->mods.flags |= ACTION_MODS_LOOKUP_MODMAP;

        break;
    case XCB_XKB_SA_TYPE_SET_GROUP:
        action->type = ACTION_TYPE_GROUP_SET;

        action->group.group = wire->setgroup.group;

        if (wire->setmods.flags & XCB_XKB_SA_CLEAR_LOCKS)
            action->group.flags |= ACTION_LOCK_CLEAR;
        if (wire->setmods.flags & XCB_XKB_SA_LATCH_TO_LOCK)
            action->group.flags |= ACTION_LATCH_TO_LOCK;
        if (wire->setmods.flags & XCB_XKB_SA_ISO_LOCK_FLAG_GROUP_ABSOLUTE)
            action->group.flags |= ACTION_ABSOLUTE_SWITCH;

        break;
    case XCB_XKB_SA_TYPE_LATCH_GROUP:
        action->type = ACTION_TYPE_GROUP_LATCH;

        action->group.group = wire->latchgroup.group;

        if (wire->latchmods.flags & XCB_XKB_SA_CLEAR_LOCKS)
            action->group.flags |= ACTION_LOCK_CLEAR;
        if (wire->latchmods.flags & XCB_XKB_SA_LATCH_TO_LOCK)
            action->group.flags |= ACTION_LATCH_TO_LOCK;
        if (wire->latchmods.flags & XCB_XKB_SA_ISO_LOCK_FLAG_GROUP_ABSOLUTE)
            action->group.flags |= ACTION_ABSOLUTE_SWITCH;

        break;
    case XCB_XKB_SA_TYPE_LOCK_GROUP:
        action->type = ACTION_TYPE_GROUP_LOCK;

        action->group.group = wire->lockgroup.group;

        if (wire->lockgroup.flags & XCB_XKB_SA_ISO_LOCK_FLAG_GROUP_ABSOLUTE)
            action->group.flags |= ACTION_ABSOLUTE_SWITCH;

        break;
    case XCB_XKB_SA_TYPE_MOVE_PTR:
        action->type = ACTION_TYPE_PTR_MOVE;

        action->ptr.x = (int16_t) (wire->moveptr.xLow | ((uint16_t) wire->moveptr.xHigh << 8));
        action->ptr.y = (int16_t) (wire->moveptr.yLow | ((uint16_t) wire->moveptr.yHigh << 8));

        if (!(wire->moveptr.flags & XCB_XKB_SA_MOVE_PTR_FLAG_NO_ACCELERATION))
            action->ptr.flags |= ACTION_ACCEL;
        if (wire->moveptr.flags & XCB_XKB_SA_MOVE_PTR_FLAG_MOVE_ABSOLUTE_X)
            action->ptr.flags |= ACTION_ABSOLUTE_X;
        if (wire->moveptr.flags & XCB_XKB_SA_MOVE_PTR_FLAG_MOVE_ABSOLUTE_Y)
            action->ptr.flags |= ACTION_ABSOLUTE_Y;

        break;
    case XCB_XKB_SA_TYPE_PTR_BTN:
        action->type = ACTION_TYPE_PTR_BUTTON;

        action->btn.count = wire->ptrbtn.count;
        action->btn.button = wire->ptrbtn.button;
        action->btn.flags = 0;

        break;
    case XCB_XKB_SA_TYPE_LOCK_PTR_BTN:
        action->type = ACTION_TYPE_PTR_LOCK;

        action->btn.button = wire->lockptrbtn.button;

        if (wire->lockptrbtn.flags & XCB_XKB_SA_ISO_LOCK_FLAG_NO_LOCK)
            action->btn.flags |= ACTION_LOCK_NO_LOCK;
        if (wire->lockptrbtn.flags & XCB_XKB_SA_ISO_LOCK_FLAG_NO_UNLOCK)
            action->btn.flags |= ACTION_LOCK_NO_UNLOCK;

        break;
    case XCB_XKB_SA_TYPE_SET_PTR_DFLT:
        action->type = ACTION_TYPE_PTR_DEFAULT;

        action->dflt.value = wire->setptrdflt.value;

        if (wire->setptrdflt.flags & XCB_XKB_SA_SET_PTR_DFLT_FLAG_DFLT_BTN_ABSOLUTE)
            action->dflt.flags |= ACTION_ABSOLUTE_SWITCH;

        break;
    case XCB_XKB_SA_TYPE_TERMINATE:
        action->type = ACTION_TYPE_TERMINATE;

        break;
    case XCB_XKB_SA_TYPE_SWITCH_SCREEN:
        action->type = ACTION_TYPE_SWITCH_VT;

        action->screen.screen = wire->switchscreen.newScreen;

        if (!(wire->switchscreen.flags & XCB_XKB_SWITCH_SCREEN_FLAG_APPLICATION))
            action->screen.flags |= ACTION_SAME_SCREEN;
        if (wire->switchscreen.flags & XCB_XKB_SWITCH_SCREEN_FLAG_ABSOLUTE)
            action->screen.flags |= ACTION_ABSOLUTE_SWITCH;

        break;
    case XCB_XKB_SA_TYPE_SET_CONTROLS:
        action->type = ACTION_TYPE_CTRL_SET;
        {
            const uint16_t mask = (wire->setcontrols.boolCtrlsLow |
                                   (wire->setcontrols.boolCtrlsHigh << 8));
            action->ctrls.ctrls = translate_controls_mask(mask);
        }
        break;
    case XCB_XKB_SA_TYPE_LOCK_CONTROLS:
        action->type = ACTION_TYPE_CTRL_LOCK;
        {
            const uint16_t mask = (wire->lockcontrols.boolCtrlsLow |
                                   (wire->lockcontrols.boolCtrlsHigh << 8));
            action->ctrls.ctrls = translate_controls_mask(mask);
        }
        break;

    case XCB_XKB_SA_TYPE_NO_ACTION:
    /* We don't support these. */
    case XCB_XKB_SA_TYPE_ISO_LOCK:
    case XCB_XKB_SA_TYPE_REDIRECT_KEY:
    case XCB_XKB_SA_TYPE_ACTION_MESSAGE:
    case XCB_XKB_SA_TYPE_DEVICE_BTN:
    case XCB_XKB_SA_TYPE_LOCK_DEVICE_BTN:
    case XCB_XKB_SA_TYPE_DEVICE_VALUATOR:
        action->type = ACTION_TYPE_NONE;
        break;

    default:
        if (wire->type < ACTION_TYPE_PRIVATE) {
            action->type = ACTION_TYPE_NONE;
            break;
        }

        /* Treat high unknown actions as Private actions. */
        action->priv.type = wire->noaction.type;
        STATIC_ASSERT(sizeof(action->priv.data) == 7 &&
                      sizeof(wire->noaction.pad0) == 7,
                      "The private action data must be 7 bytes long!");
        memcpy(action->priv.data, wire->noaction.pad0, 7);
        break;
    }
}

static bool
get_types(struct xkb_keymap *keymap, xcb_connection_t *conn,
          xcb_xkb_get_map_reply_t *reply, xcb_xkb_get_map_map_t *map)
{
    int types_length = xcb_xkb_get_map_map_types_rtrn_length(reply, map);
    xcb_xkb_key_type_iterator_t types_iter =
        xcb_xkb_get_map_map_types_rtrn_iterator(reply, map);

    FAIL_UNLESS(reply->firstType == 0);

    keymap->num_types = reply->nTypes;
    ALLOC_OR_FAIL(keymap->types, keymap->num_types);

    for (int i = 0; i < types_length; i++) {
        xcb_xkb_key_type_t *wire_type = types_iter.data;
        struct xkb_key_type *type = &keymap->types[i];

        FAIL_UNLESS(wire_type->numLevels > 0);

        type->mods.mods = translate_mods(wire_type->mods_mods,
                                         wire_type->mods_vmods, 0);
        type->mods.mask = translate_mods(wire_type->mods_mask, 0, 0);
        type->num_levels = wire_type->numLevels;

        {
            int entries_length = xcb_xkb_key_type_map_length(wire_type);
            xcb_xkb_kt_map_entry_iterator_t entries_iter =
                xcb_xkb_key_type_map_iterator(wire_type);

            type->num_entries = wire_type->nMapEntries;
            ALLOC_OR_FAIL(type->entries, type->num_entries);

            for (int j = 0; j < entries_length; j++) {
                xcb_xkb_kt_map_entry_t *wire_entry = entries_iter.data;
                struct xkb_key_type_entry *entry = &type->entries[j];

                FAIL_UNLESS(wire_entry->level < type->num_levels);

                entry->level = wire_entry->level;
                entry->mods.mods = translate_mods(wire_entry->mods_mods,
                                                  wire_entry->mods_vmods, 0);
                entry->mods.mask = translate_mods(wire_entry->mods_mask, 0, 0);

                xcb_xkb_kt_map_entry_next(&entries_iter);
            }
        }

        {
            int preserves_length = xcb_xkb_key_type_preserve_length(wire_type);
            xcb_xkb_mod_def_iterator_t preserves_iter =
                xcb_xkb_key_type_preserve_iterator(wire_type);

            FAIL_UNLESS((unsigned) preserves_length <= type->num_entries);

            for (int j = 0; j < preserves_length; j++) {
                xcb_xkb_mod_def_t *wire_preserve = preserves_iter.data;
                struct xkb_key_type_entry *entry = &type->entries[j];

                entry->preserve.mods = translate_mods(wire_preserve->realMods,
                                                      wire_preserve->vmods, 0);
                entry->preserve.mask = translate_mods(wire_preserve->mask, 0, 0);

                xcb_xkb_mod_def_next(&preserves_iter);
            }
        }

        xcb_xkb_key_type_next(&types_iter);
    }

    return true;

fail:
    return false;
}

static bool
get_sym_maps(struct xkb_keymap *keymap, xcb_connection_t *conn,
             xcb_xkb_get_map_reply_t *reply, xcb_xkb_get_map_map_t *map)
{
    int sym_maps_length = xcb_xkb_get_map_map_syms_rtrn_length(reply, map);
    xcb_xkb_key_sym_map_iterator_t sym_maps_iter =
        xcb_xkb_get_map_map_syms_rtrn_iterator(reply, map);

    FAIL_UNLESS(reply->minKeyCode <= reply->maxKeyCode);
    FAIL_UNLESS(reply->firstKeySym >= reply->minKeyCode);
    FAIL_UNLESS(reply->firstKeySym + reply->nKeySyms <= reply->maxKeyCode + 1);

    keymap->min_key_code = reply->minKeyCode;
    keymap->max_key_code = reply->maxKeyCode;

    ALLOC_OR_FAIL(keymap->keys, keymap->max_key_code + 1);

    for (xkb_keycode_t kc = keymap->min_key_code; kc <= keymap->max_key_code; kc++)
        keymap->keys[kc].keycode = kc;

    for (int i = 0; i < sym_maps_length; i++) {
        xcb_xkb_key_sym_map_t *wire_sym_map = sym_maps_iter.data;
        struct xkb_key *key = &keymap->keys[reply->firstKeySym + i];

        key->num_groups = wire_sym_map->groupInfo & 0x0f;
        FAIL_UNLESS(key->num_groups <= ARRAY_SIZE(wire_sym_map->kt_index));
        ALLOC_OR_FAIL(key->groups, key->num_groups);

        for (unsigned j = 0; j < key->num_groups; j++) {
            FAIL_UNLESS(wire_sym_map->kt_index[j] < keymap->num_types);
            key->groups[j].type = &keymap->types[wire_sym_map->kt_index[j]];

            ALLOC_OR_FAIL(key->groups[j].levels, key->groups[j].type->num_levels);
        }

        key->out_of_range_group_number = (wire_sym_map->groupInfo & 0x30) >> 4;

        FAIL_UNLESS(key->out_of_range_group_number <= key->num_groups);

        if (wire_sym_map->groupInfo & XCB_XKB_GROUPS_WRAP_CLAMP_INTO_RANGE)
            key->out_of_range_group_action = RANGE_SATURATE;
        else if (wire_sym_map->groupInfo & XCB_XKB_GROUPS_WRAP_REDIRECT_INTO_RANGE)
            key->out_of_range_group_action = RANGE_REDIRECT;
        else
            key->out_of_range_group_action = RANGE_WRAP;

        {
            int syms_length = xcb_xkb_key_sym_map_syms_length(wire_sym_map);
            xcb_keysym_t *syms_iter = xcb_xkb_key_sym_map_syms(wire_sym_map);

            FAIL_UNLESS((unsigned) syms_length == wire_sym_map->width * key->num_groups);

            for (int j = 0; j < syms_length; j++) {
                xcb_keysym_t wire_keysym = *syms_iter;
                const xkb_layout_index_t group = j / wire_sym_map->width;
                const xkb_level_index_t level = j % wire_sym_map->width;

                assert(key->groups[group].type != NULL);
                if (level < key->groups[group].type->num_levels &&
                    wire_keysym != XKB_KEY_NoSymbol) {
                    key->groups[group].levels[level].num_syms = 1;
                    key->groups[group].levels[level].u.sym = wire_keysym;
                }

                syms_iter++;
            }
        }

        xcb_xkb_key_sym_map_next(&sym_maps_iter);
    }

    return true;

fail:
    return false;
}

static bool
get_actions(struct xkb_keymap *keymap, xcb_connection_t *conn,
            xcb_xkb_get_map_reply_t *reply, xcb_xkb_get_map_map_t *map)
{
    int acts_count_length =
        xcb_xkb_get_map_map_acts_rtrn_count_length(reply, map);
    uint8_t *acts_count_iter = xcb_xkb_get_map_map_acts_rtrn_count(map);
    xcb_xkb_action_iterator_t acts_iter =
        xcb_xkb_get_map_map_acts_rtrn_acts_iterator(reply, map);
    xcb_xkb_key_sym_map_iterator_t sym_maps_iter =
        xcb_xkb_get_map_map_syms_rtrn_iterator(reply, map);

    FAIL_UNLESS(reply->firstKeyAction == keymap->min_key_code);
    FAIL_UNLESS(reply->firstKeyAction + reply->nKeyActions ==
                keymap->max_key_code + 1);

    for (int i = 0; i < acts_count_length; i++) {
        xcb_xkb_key_sym_map_t *wire_sym_map = sym_maps_iter.data;
        int syms_length = xcb_xkb_key_sym_map_syms_length(wire_sym_map);
        uint8_t wire_count = *acts_count_iter;
        struct xkb_key *key = &keymap->keys[reply->firstKeyAction + i];

        FAIL_UNLESS(wire_count == 0 || wire_count == syms_length);

        for (int j = 0; j < wire_count; j++) {
            xcb_xkb_action_t *wire_action = acts_iter.data;
            const xkb_layout_index_t group = j / wire_sym_map->width;
            const xkb_level_index_t level = j % wire_sym_map->width;

            if (level < key->groups[group].type->num_levels) {
                union xkb_action *action =
                    &key->groups[group].levels[level].action;

                translate_action(action, wire_action);
            }

            xcb_xkb_action_next(&acts_iter);
        }

        acts_count_iter++;
        xcb_xkb_key_sym_map_next(&sym_maps_iter);
    }

    return true;

fail:
    return false;
}

static bool
get_vmods(struct xkb_keymap *keymap, xcb_connection_t *conn,
          xcb_xkb_get_map_reply_t *reply, xcb_xkb_get_map_map_t *map)
{
    uint8_t *iter = xcb_xkb_get_map_map_vmods_rtrn(map);

    keymap->mods.num_mods =
        NUM_REAL_MODS + MIN(msb_pos(reply->virtualMods), NUM_VMODS);

    for (unsigned i = 0; i < NUM_VMODS; i++) {
        if (reply->virtualMods & (1u << i)) {
            uint8_t wire = *iter;
            struct xkb_mod *mod = &keymap->mods.mods[NUM_REAL_MODS + i];

            mod->type = MOD_VIRT;
            mod->mapping = translate_mods(wire, 0, 0);

            iter++;
        }
    }

    return true;
}

static bool
get_explicits(struct xkb_keymap *keymap, xcb_connection_t *conn,
              xcb_xkb_get_map_reply_t *reply, xcb_xkb_get_map_map_t *map)
{
    int length = xcb_xkb_get_map_map_explicit_rtrn_length(reply, map);
    xcb_xkb_set_explicit_iterator_t iter =
        xcb_xkb_get_map_map_explicit_rtrn_iterator(reply, map);

    for (int i = 0; i < length; i++) {
        xcb_xkb_set_explicit_t *wire = iter.data;
        struct xkb_key *key;

        FAIL_UNLESS(wire->keycode >= keymap->min_key_code &&
                    wire->keycode <= keymap->max_key_code);

        key = &keymap->keys[wire->keycode];

        if ((wire->explicit & XCB_XKB_EXPLICIT_KEY_TYPE_1) &&
            key->num_groups > 0)
            key->groups[0].explicit_type = true;
        if ((wire->explicit & XCB_XKB_EXPLICIT_KEY_TYPE_2) &&
            key->num_groups > 1)
            key->groups[1].explicit_type = true;
        if ((wire->explicit & XCB_XKB_EXPLICIT_KEY_TYPE_3) &&
            key->num_groups > 2)
            key->groups[2].explicit_type = true;
        if ((wire->explicit & XCB_XKB_EXPLICIT_KEY_TYPE_4) &&
            key->num_groups > 3)
            key->groups[3].explicit_type = true;
        if (wire->explicit & XCB_XKB_EXPLICIT_INTERPRET)
            key->explicit |= EXPLICIT_INTERP;
        if (wire->explicit & XCB_XKB_EXPLICIT_AUTO_REPEAT)
            key->explicit |= EXPLICIT_REPEAT;
        if (wire->explicit & XCB_XKB_EXPLICIT_V_MOD_MAP)
            key->explicit |= EXPLICIT_VMODMAP;

        xcb_xkb_set_explicit_next(&iter);
    }

    return true;

fail:
    return false;
}

static bool
get_modmaps(struct xkb_keymap *keymap, xcb_connection_t *conn,
            xcb_xkb_get_map_reply_t *reply, xcb_xkb_get_map_map_t *map)
{
    int length = xcb_xkb_get_map_map_modmap_rtrn_length(reply, map);
    xcb_xkb_key_mod_map_iterator_t iter =
        xcb_xkb_get_map_map_modmap_rtrn_iterator(reply, map);

    for (int i = 0; i < length; i++) {
        xcb_xkb_key_mod_map_t *wire = iter.data;
        struct xkb_key *key;

        FAIL_UNLESS(wire->keycode >= keymap->min_key_code &&
                    wire->keycode <= keymap->max_key_code);

        key = &keymap->keys[wire->keycode];
        key->modmap = wire->mods;

        xcb_xkb_key_mod_map_next(&iter);
    }

    return true;

fail:
    return false;
}

static bool
get_vmodmaps(struct xkb_keymap *keymap, xcb_connection_t *conn,
             xcb_xkb_get_map_reply_t *reply, xcb_xkb_get_map_map_t *map)
{
    int length = xcb_xkb_get_map_map_vmodmap_rtrn_length(reply, map);
    xcb_xkb_key_v_mod_map_iterator_t iter =
        xcb_xkb_get_map_map_vmodmap_rtrn_iterator(reply, map);

    for (int i = 0; i < length; i++) {
        xcb_xkb_key_v_mod_map_t *wire = iter.data;
        struct xkb_key *key;

        FAIL_UNLESS(wire->keycode >= keymap->min_key_code &&
                    wire->keycode <= keymap->max_key_code);

        key = &keymap->keys[wire->keycode];
        key->vmodmap = translate_mods(0, wire->vmods, 0);

        xcb_xkb_key_v_mod_map_next(&iter);
    }

    return true;

fail:
    return false;
}

static bool
get_map(struct xkb_keymap *keymap, xcb_connection_t *conn, uint16_t device_id)
{
    static const xcb_xkb_map_part_t required_components =
        (XCB_XKB_MAP_PART_KEY_TYPES |
         XCB_XKB_MAP_PART_KEY_SYMS |
         XCB_XKB_MAP_PART_MODIFIER_MAP |
         XCB_XKB_MAP_PART_EXPLICIT_COMPONENTS |
         XCB_XKB_MAP_PART_KEY_ACTIONS |
         XCB_XKB_MAP_PART_VIRTUAL_MODS |
         XCB_XKB_MAP_PART_VIRTUAL_MOD_MAP);

    xcb_xkb_get_map_cookie_t cookie =
        xcb_xkb_get_map(conn, device_id, required_components,
                        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
    xcb_xkb_get_map_reply_t *reply = xcb_xkb_get_map_reply(conn, cookie, NULL);
    xcb_xkb_get_map_map_t map;

    FAIL_IF_BAD_REPLY(reply, "XkbGetMap");

    if ((reply->present & required_components) != required_components)
        goto fail;

    xcb_xkb_get_map_map_unpack(xcb_xkb_get_map_map(reply),
                               reply->nTypes,
                               reply->nKeySyms,
                               reply->nKeyActions,
                               reply->totalActions,
                               reply->totalKeyBehaviors,
                               reply->virtualMods,
                               reply->totalKeyExplicit,
                               reply->totalModMapKeys,
                               reply->totalVModMapKeys,
                               reply->present,
                               &map);

    if (!get_types(keymap, conn, reply, &map) ||
        !get_sym_maps(keymap, conn, reply, &map) ||
        !get_actions(keymap, conn, reply, &map) ||
        !get_vmods(keymap, conn, reply, &map) ||
        !get_explicits(keymap, conn, reply, &map) ||
        !get_modmaps(keymap, conn, reply, &map) ||
        !get_vmodmaps(keymap, conn, reply, &map))
        goto fail;

    free(reply);
    return true;

fail:
    free(reply);
    return false;
}

static bool
get_indicators(struct xkb_keymap *keymap, xcb_connection_t *conn,
               xcb_xkb_get_indicator_map_reply_t *reply)
{
    xcb_xkb_indicator_map_iterator_t iter =
        xcb_xkb_get_indicator_map_maps_iterator(reply);

    keymap->num_leds = msb_pos(reply->which);

    for (unsigned i = 0; i < NUM_INDICATORS; i++) {
        if (reply->which & (1u << i)) {
            xcb_xkb_indicator_map_t *wire = iter.data;
            struct xkb_led *led = &keymap->leds[i];

            if (wire->whichGroups & XCB_XKB_IM_GROUPS_WHICH_USE_BASE)
                led->which_groups |= XKB_STATE_LAYOUT_DEPRESSED;
            if (wire->whichGroups & XCB_XKB_IM_GROUPS_WHICH_USE_LATCHED)
                led->which_groups |= XKB_STATE_LAYOUT_LATCHED;
            if (wire->whichGroups & XCB_XKB_IM_GROUPS_WHICH_USE_LOCKED)
                led->which_groups |= XKB_STATE_LAYOUT_LOCKED;
            if (wire->whichGroups & XCB_XKB_IM_GROUPS_WHICH_USE_EFFECTIVE)
                led->which_groups |= XKB_STATE_LAYOUT_EFFECTIVE;
            if (wire->whichGroups & XCB_XKB_IM_GROUPS_WHICH_USE_COMPAT)
                led->which_groups |= XKB_STATE_LAYOUT_EFFECTIVE;

            led->groups = wire->groups;

            if (wire->whichMods & XCB_XKB_IM_MODS_WHICH_USE_BASE)
                led->which_mods |= XKB_STATE_MODS_DEPRESSED;
            if (wire->whichMods & XCB_XKB_IM_MODS_WHICH_USE_LATCHED)
                led->which_mods |= XKB_STATE_MODS_LATCHED;
            if (wire->whichMods & XCB_XKB_IM_MODS_WHICH_USE_LOCKED)
                led->which_mods |= XKB_STATE_MODS_LOCKED;
            if (wire->whichMods & XCB_XKB_IM_MODS_WHICH_USE_EFFECTIVE)
                led->which_mods |= XKB_STATE_MODS_EFFECTIVE;
            if (wire->whichMods & XCB_XKB_IM_MODS_WHICH_USE_COMPAT)
                led->which_mods |= XKB_STATE_MODS_EFFECTIVE;

            led->mods.mods = translate_mods(wire->realMods, wire->vmods, 0);
            led->mods.mask = translate_mods(wire->mods, 0, 0);

            led->ctrls = translate_controls_mask(wire->ctrls);

            xcb_xkb_indicator_map_next(&iter);
        }
    }

    return true;
}

static bool
get_indicator_map(struct xkb_keymap *keymap, xcb_connection_t *conn,
                  uint16_t device_id)
{
    xcb_xkb_get_indicator_map_cookie_t cookie =
        xcb_xkb_get_indicator_map(conn, device_id, ALL_INDICATORS_MASK);
    xcb_xkb_get_indicator_map_reply_t *reply =
        xcb_xkb_get_indicator_map_reply(conn, cookie, NULL);

    FAIL_IF_BAD_REPLY(reply, "XkbGetIndicatorMap");

    if (!get_indicators(keymap, conn, reply))
        goto fail;

    free(reply);
    return true;

fail:
    free(reply);
    return false;
}

static bool
get_sym_interprets(struct xkb_keymap *keymap, xcb_connection_t *conn,
                   xcb_xkb_get_compat_map_reply_t *reply)
{
    int length = xcb_xkb_get_compat_map_si_rtrn_length(reply);
    xcb_xkb_sym_interpret_iterator_t iter =
        xcb_xkb_get_compat_map_si_rtrn_iterator(reply);

    FAIL_UNLESS(reply->firstSIRtrn == 0);
    FAIL_UNLESS(reply->nSIRtrn == reply->nTotalSI);

    keymap->num_sym_interprets = reply->nSIRtrn;
    ALLOC_OR_FAIL(keymap->sym_interprets, keymap->num_sym_interprets);

    for (int i = 0; i < length; i++) {
        xcb_xkb_sym_interpret_t *wire = iter.data;
        struct xkb_sym_interpret *sym_interpret = &keymap->sym_interprets[i];

        sym_interpret->sym = wire->sym;

        switch (wire->match & XCB_XKB_SYM_INTERP_MATCH_OP_MASK) {
        case XCB_XKB_SYM_INTERPRET_MATCH_NONE_OF:
            sym_interpret->match = MATCH_NONE;
            break;
        case XCB_XKB_SYM_INTERPRET_MATCH_ANY_OF_OR_NONE:
            sym_interpret->match = MATCH_ANY_OR_NONE;
            break;
        case XCB_XKB_SYM_INTERPRET_MATCH_ANY_OF:
            sym_interpret->match = MATCH_ANY;
            break;
        case XCB_XKB_SYM_INTERPRET_MATCH_ALL_OF:
            sym_interpret->match = MATCH_ALL;
            break;
        case XCB_XKB_SYM_INTERPRET_MATCH_EXACTLY:
            sym_interpret->match = MATCH_EXACTLY;
            break;
        }

        sym_interpret->level_one_only =
            (wire->match & XCB_XKB_SYM_INTERP_MATCH_LEVEL_ONE_ONLY);
        sym_interpret->mods = wire->mods;

        if (wire->virtualMod == NO_MODIFIER)
            sym_interpret->virtual_mod = XKB_MOD_INVALID;
        else
            sym_interpret->virtual_mod = NUM_REAL_MODS + wire->virtualMod;

        sym_interpret->repeat = (wire->flags & 0x01);
        translate_action(&sym_interpret->action,
                         (xcb_xkb_action_t *) &wire->action);

        xcb_xkb_sym_interpret_next(&iter);
    }

    return true;

fail:
    return false;
}

static bool
get_compat_map(struct xkb_keymap *keymap, xcb_connection_t *conn,
               uint16_t device_id)
{
    xcb_xkb_get_compat_map_cookie_t cookie =
        xcb_xkb_get_compat_map(conn, device_id, 0, true, 0, 0);
    xcb_xkb_get_compat_map_reply_t *reply =
        xcb_xkb_get_compat_map_reply(conn, cookie, NULL);

    FAIL_IF_BAD_REPLY(reply, "XkbGetCompatMap");

    if (!get_sym_interprets(keymap, conn, reply))
        goto fail;

    free(reply);
    return true;

fail:
    free(reply);
    return false;
}

static bool
get_type_names(struct xkb_keymap *keymap, xcb_connection_t *conn,
               xcb_xkb_get_names_reply_t *reply,
               xcb_xkb_get_names_value_list_t *list)
{
    int key_type_names_length =
        xcb_xkb_get_names_value_list_type_names_length(reply, list);
    xcb_atom_t *key_type_names_iter =
        xcb_xkb_get_names_value_list_type_names(list);
    int n_levels_per_type_length =
        xcb_xkb_get_names_value_list_n_levels_per_type_length(reply, list);
    uint8_t *n_levels_per_type_iter =
        xcb_xkb_get_names_value_list_n_levels_per_type(list);
    xcb_atom_t *kt_level_names_iter =
        xcb_xkb_get_names_value_list_kt_level_names(list);

    FAIL_UNLESS(reply->nTypes == keymap->num_types);
    FAIL_UNLESS(key_type_names_length == n_levels_per_type_length);

    for (int i = 0; i < key_type_names_length; i++) {
        xcb_atom_t wire_type_name = *key_type_names_iter;
        uint8_t wire_num_levels = *n_levels_per_type_iter;
        struct xkb_key_type *type = &keymap->types[i];

        /* Levels must have names. */
        FAIL_UNLESS(type->num_levels == wire_num_levels);

        ALLOC_OR_FAIL(type->level_names, type->num_levels);

        if (!adopt_atom(keymap->ctx, conn, wire_type_name, &type->name))
            goto fail;

        if (!adopt_atoms(keymap->ctx, conn,
                         kt_level_names_iter, type->level_names,
                         wire_num_levels))
            goto fail;

        kt_level_names_iter += wire_num_levels;
        key_type_names_iter++;
        n_levels_per_type_iter++;
    }

    return true;

fail:
    return false;
}

static bool
get_indicator_names(struct xkb_keymap *keymap, xcb_connection_t *conn,
                    xcb_xkb_get_names_reply_t *reply,
                    xcb_xkb_get_names_value_list_t *list)
{
    xcb_atom_t *iter = xcb_xkb_get_names_value_list_indicator_names(list);

    FAIL_UNLESS(msb_pos(reply->indicators) <= keymap->num_leds);

    for (unsigned i = 0; i < NUM_INDICATORS; i++) {
        if (reply->indicators & (1u << i)) {
            xcb_atom_t wire = *iter;
            struct xkb_led *led = &keymap->leds[i];

            if (!adopt_atom(keymap->ctx, conn, wire, &led->name))
                return false;

            iter++;
        }
    }

    return true;

fail:
    return false;
}

static bool
get_vmod_names(struct xkb_keymap *keymap, xcb_connection_t *conn,
               xcb_xkb_get_names_reply_t *reply,
               xcb_xkb_get_names_value_list_t *list)
{
    xcb_atom_t *iter = xcb_xkb_get_names_value_list_virtual_mod_names(list);

    /*
     * GetMap's reply->virtualMods is always 0xffff. This one really
     * tells us which vmods exist (a vmod must have a name), so we fix
     * up the size here.
     */
    keymap->mods.num_mods =
        NUM_REAL_MODS + MIN(msb_pos(reply->virtualMods), NUM_VMODS);

    for (unsigned i = 0; i < NUM_VMODS; i++) {
        if (reply->virtualMods & (1u << i)) {
            xcb_atom_t wire = *iter;
            struct xkb_mod *mod = &keymap->mods.mods[NUM_REAL_MODS + i];

            if (!adopt_atom(keymap->ctx, conn, wire, &mod->name))
                return false;

            iter++;
        }
    }

    return true;
}

static bool
get_group_names(struct xkb_keymap *keymap, xcb_connection_t *conn,
                xcb_xkb_get_names_reply_t *reply,
                xcb_xkb_get_names_value_list_t *list)
{
    int length = xcb_xkb_get_names_value_list_groups_length(reply, list);
    xcb_atom_t *iter = xcb_xkb_get_names_value_list_groups(list);

    keymap->num_group_names = msb_pos(reply->groupNames);
    ALLOC_OR_FAIL(keymap->group_names, keymap->num_group_names);

    if (!adopt_atoms(keymap->ctx, conn,
                     iter, keymap->group_names, length))
        goto fail;

    return true;

fail:
    return false;
}

static bool
get_key_names(struct xkb_keymap *keymap, xcb_connection_t *conn,
              xcb_xkb_get_names_reply_t *reply,
              xcb_xkb_get_names_value_list_t *list)
{
    int length = xcb_xkb_get_names_value_list_key_names_length(reply, list);
    xcb_xkb_key_name_iterator_t iter =
        xcb_xkb_get_names_value_list_key_names_iterator(reply, list);

    FAIL_UNLESS(reply->minKeyCode == keymap->min_key_code);
    FAIL_UNLESS(reply->maxKeyCode == keymap->max_key_code);
    FAIL_UNLESS(reply->firstKey == keymap->min_key_code);
    FAIL_UNLESS(reply->firstKey + reply->nKeys - 1U == keymap->max_key_code);

    for (int i = 0; i < length; i++) {
        xcb_xkb_key_name_t *wire = iter.data;
        xkb_atom_t *key_name = &keymap->keys[reply->firstKey + i].name;

        if (wire->name[0] == '\0') {
            *key_name = XKB_ATOM_NONE;
        }
        else {
            *key_name = xkb_atom_intern(keymap->ctx, wire->name,
                                        strnlen(wire->name,
                                                XCB_XKB_CONST_KEY_NAME_LENGTH));
            if (!*key_name)
                return false;
        }

        xcb_xkb_key_name_next(&iter);
    }

    return true;

fail:
    return false;
}

static bool
get_aliases(struct xkb_keymap *keymap, xcb_connection_t *conn,
            xcb_xkb_get_names_reply_t *reply,
            xcb_xkb_get_names_value_list_t *list)
{
    int length = xcb_xkb_get_names_value_list_key_aliases_length(reply, list);
    xcb_xkb_key_alias_iterator_t iter =
        xcb_xkb_get_names_value_list_key_aliases_iterator(reply, list);

    keymap->num_key_aliases = reply->nKeyAliases;
    ALLOC_OR_FAIL(keymap->key_aliases, keymap->num_key_aliases);

    for (int i = 0; i < length; i++) {
        xcb_xkb_key_alias_t *wire = iter.data;
        struct xkb_key_alias *alias = &keymap->key_aliases[i];

        alias->real =
            xkb_atom_intern(keymap->ctx, wire->real,
                            strnlen(wire->real, XCB_XKB_CONST_KEY_NAME_LENGTH));
        alias->alias =
            xkb_atom_intern(keymap->ctx, wire->alias,
                            strnlen(wire->alias, XCB_XKB_CONST_KEY_NAME_LENGTH));
        if (!alias->real || !alias->alias)
            goto fail;

        xcb_xkb_key_alias_next(&iter);
    }

    return true;

fail:
    return false;
}

static bool
get_names(struct xkb_keymap *keymap, xcb_connection_t *conn,
          uint16_t device_id)
{
    static const xcb_xkb_name_detail_t wanted =
        (XCB_XKB_NAME_DETAIL_KEYCODES |
         XCB_XKB_NAME_DETAIL_SYMBOLS |
         XCB_XKB_NAME_DETAIL_TYPES |
         XCB_XKB_NAME_DETAIL_COMPAT |
         XCB_XKB_NAME_DETAIL_KEY_TYPE_NAMES |
         XCB_XKB_NAME_DETAIL_KT_LEVEL_NAMES |
         XCB_XKB_NAME_DETAIL_INDICATOR_NAMES |
         XCB_XKB_NAME_DETAIL_KEY_NAMES |
         XCB_XKB_NAME_DETAIL_KEY_ALIASES |
         XCB_XKB_NAME_DETAIL_VIRTUAL_MOD_NAMES |
         XCB_XKB_NAME_DETAIL_GROUP_NAMES);
    static const xcb_xkb_name_detail_t required =
        (XCB_XKB_NAME_DETAIL_KEY_TYPE_NAMES |
         XCB_XKB_NAME_DETAIL_KT_LEVEL_NAMES |
         XCB_XKB_NAME_DETAIL_KEY_NAMES |
         XCB_XKB_NAME_DETAIL_VIRTUAL_MOD_NAMES);

    xcb_xkb_get_names_cookie_t cookie =
        xcb_xkb_get_names(conn, device_id, wanted);
    xcb_xkb_get_names_reply_t *reply =
        xcb_xkb_get_names_reply(conn, cookie, NULL);
    xcb_xkb_get_names_value_list_t list;

    FAIL_IF_BAD_REPLY(reply, "XkbGetNames");

    FAIL_UNLESS((reply->which & required) == required);

    xcb_xkb_get_names_value_list_unpack(xcb_xkb_get_names_value_list(reply),
                                        reply->nTypes,
                                        reply->indicators,
                                        reply->virtualMods,
                                        reply->groupNames,
                                        reply->nKeys,
                                        reply->nKeyAliases,
                                        reply->nRadioGroups,
                                        reply->which,
                                        &list);

    if (!get_atom_name(conn, list.keycodesName, &keymap->keycodes_section_name) ||
        !get_atom_name(conn, list.symbolsName, &keymap->symbols_section_name) ||
        !get_atom_name(conn, list.typesName, &keymap->types_section_name) ||
        !get_atom_name(conn, list.compatName, &keymap->compat_section_name) ||
        !get_type_names(keymap, conn, reply, &list) ||
        !get_indicator_names(keymap, conn, reply, &list) ||
        !get_vmod_names(keymap, conn, reply, &list) ||
        !get_group_names(keymap, conn, reply, &list) ||
        !get_key_names(keymap, conn, reply, &list) ||
        !get_aliases(keymap, conn, reply, &list))
        goto fail;

    XkbEscapeMapName(keymap->keycodes_section_name);
    XkbEscapeMapName(keymap->symbols_section_name);
    XkbEscapeMapName(keymap->types_section_name);
    XkbEscapeMapName(keymap->compat_section_name);

    free(reply);
    return true;

fail:
    free(reply);
    return false;
}

static bool
get_controls(struct xkb_keymap *keymap, xcb_connection_t *conn,
             uint16_t device_id)
{
    xcb_xkb_get_controls_cookie_t cookie =
        xcb_xkb_get_controls(conn, device_id);
    xcb_xkb_get_controls_reply_t *reply =
        xcb_xkb_get_controls_reply(conn, cookie, NULL);

    FAIL_IF_BAD_REPLY(reply, "XkbGetControls");
    FAIL_UNLESS(reply->numGroups > 0 && reply->numGroups <= 4);

    keymap->enabled_ctrls = translate_controls_mask(reply->enabledControls);
    keymap->num_groups = reply->numGroups;

    FAIL_UNLESS(keymap->max_key_code < XCB_XKB_CONST_PER_KEY_BIT_ARRAY_SIZE * 8);

    for (xkb_keycode_t i = keymap->min_key_code; i <= keymap->max_key_code; i++)
        keymap->keys[i].repeats = (reply->perKeyRepeat[i / 8] & (1 << (i % 8)));

    free(reply);
    return true;

fail:
    free(reply);
    return false;
}

XKB_EXPORT struct xkb_keymap *
xkb_x11_keymap_new_from_device(struct xkb_context *ctx,
                               xcb_connection_t *conn,
                               int32_t device_id,
                               enum xkb_keymap_compile_flags flags)
{
    struct xkb_keymap *keymap;
    const enum xkb_keymap_format format = XKB_KEYMAP_FORMAT_TEXT_V1;

    if (flags & ~(XKB_KEYMAP_COMPILE_NO_FLAGS)) {
        log_err_func(ctx, "unrecognized flags: %#x\n", flags);
        return NULL;
    }

    if (device_id < 0 || device_id > 127) {
        log_err_func(ctx, "illegal device ID: %d\n", device_id);
        return NULL;
    }

    keymap = xkb_keymap_new(ctx, format, flags);
    if (!keymap)
        return NULL;

    if (!get_map(keymap, conn, device_id) ||
        !get_indicator_map(keymap, conn, device_id) ||
        !get_compat_map(keymap, conn, device_id) ||
        !get_names(keymap, conn, device_id) ||
        !get_controls(keymap, conn, device_id)) {
        xkb_keymap_unref(keymap);
        return NULL;
    }

    return keymap;
}