/* packet-btamp.c
 * Routines for the Bluetooth AMP dissection
 *
 * Copyright 2009, Kovarththanan Rajaratnam <kovarththanan.rajaratnam@gmail.com>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <epan/packet.h>

#include "packet-btl2cap.h"

/* Initialize the protocol and registered fields */
static int proto_btamp = -1;
static int hf_btamp_command = -1;
static int hf_btamp_cmd_code = -1;
static int hf_btamp_cmd_ident = -1;
static int hf_btamp_cmd_length = -1;
static int hf_btamp_cmd_data = -1;
static int hf_btamp_rej_reason = -1;
static int hf_btamp_mtu = -1;
static int hf_btamp_extfeatures = -1;
static int hf_btamp_lcontroller_id = -1;
static int hf_btamp_rcontroller_id = -1;
static int hf_btamp_controller_list = -1;
static int hf_btamp_controllers = -1;
static int hf_btamp_controller_id = -1;
static int hf_btamp_controller_type = -1;
static int hf_btamp_controller_status = -1;
static int hf_btamp_status = -1;
/* static int hf_btamp_create_status = -1; */
/* static int hf_btamp_disc_status = -1; */
static int hf_btamp_total_bw = -1;
static int hf_btamp_max_guaran_bw = -1;
static int hf_btamp_min_latency = -1;
static int hf_btamp_pal_caps_guaranteed = -1;
static int hf_btamp_pal_caps_mask = -1;
static int hf_btamp_amp_assoc_size = -1;
static int hf_btamp_amp_assoc = -1;

/* Initialize the subtree pointers */
static gint ett_btamp = -1;
static gint ett_btamp_cmd = -1;
static gint ett_btamp_caps = -1;
static gint ett_btamp_controller_entry = -1;
static gint ett_btamp_controller_list = -1;

static dissector_handle_t btamp_handle;


static const value_string command_code_vals[] = {
    { 0x01, "AMP Command Reject" },
    { 0x02, "AMP Discover Request" },
    { 0x03, "AMP Discover Response" },
    { 0x04, "AMP Change Notify" },
    { 0x05, "AMP Change Response" },
    { 0x06, "AMP Get Info Request" },
    { 0x07, "AMP Get Info Response" },
    { 0x08, "AMP Get AMP Assoc Request" },
    { 0x09, "AMP Get AMP Assoc Response" },
    { 0x0A, "AMP Create Physical Link Request" },
    { 0x0B, "AMP Create Physical Link Response" },
    { 0x0C, "AMP Disconnect Physical Link Request" },
    { 0x0D, "AMP Disconnect Physical Link Response" },
    { 0, NULL }
};

static const value_string reason_vals[] = {
    { 0x0000, "Command not understood" },
    { 0, NULL }
};

static const value_string controller_type_vals[] = {
    { 0x0000, "Bluetooth BR/EDR" },
    { 0x0001, "802.11" },
    { 0x0002, "ECMA-368" },
    { 0, NULL }
};

static const value_string controller_status_vals[] = {
    { 0x0000, "Controller available but currently physically powered down" },
    { 0x0001, "Controller used exclusively by Bluetooth BR/EDR" },
    { 0x0002, "Controller has no capacity available for Bluetooth operation" },
    { 0x0003, "Controller has low capacity available for Bluetooth operation" },
    { 0x0004, "Controller has medium capacity available for Bluetooth operation" },
    { 0x0005, "Controller has high capacity available for Bluetooth operation" },
    { 0x0006, "Controller has full capacity available for Bluetooth operation" },
    { 0, NULL }
};

static const value_string status_vals[] = {
    { 0x0000, "Success" },
    { 0x0001, "Invalid Controller ID" },
    { 0, NULL }
};

#if 0
static const value_string create_status_vals[] = {
    { 0x0000, "Success" },
    { 0x0001, "Invalid Controller ID" },
    { 0x0002, "Failed - Unable to start link creation" },
    { 0x0003, "Failed - Collision Occurred" },
    { 0x0004, "Failed - AMP Disconnected Physical Link Request packet received" },
    { 0x0005, "Failed - Physical Link Already Exists" },
    { 0, NULL }
};

static const value_string disc_status_vals[] = {
    { 0x0000, "Success" },
    { 0x0001, "Invalid Controller ID" },
    { 0x0002, "Failed - No Physical Link exists and no Physical Link creation is in progress" },
    { 0, NULL }
};
#endif

void proto_register_btamp(void);
void proto_reg_handoff_btamp(void);

static int
dissect_comrej(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
    guint16 reason;

    reason = tvb_get_letohs(tvb, offset);
    proto_tree_add_item(tree, hf_btamp_rej_reason, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    switch (reason) {
    case 0x0000: /* Command not understood */
        break;

    default:
        break;
    }

    return offset;
}

static int
dissect_discoverrequest(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_btamp_mtu, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    proto_tree_add_item(tree, hf_btamp_extfeatures, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    return offset;
}

static int
dissect_controller_entry(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree, guint16 idx)
{
    proto_item *ti_controller_entry;
    proto_tree *btamp_controller_entry_tree;

    ti_controller_entry = proto_tree_add_none_format(tree,
            hf_btamp_controllers, tvb,
            offset, 3,
            "Entry: %u", idx);
    btamp_controller_entry_tree = proto_item_add_subtree(ti_controller_entry, ett_btamp_controller_entry);

    proto_tree_add_item(btamp_controller_entry_tree, hf_btamp_controller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    proto_tree_add_item(btamp_controller_entry_tree, hf_btamp_controller_type, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    proto_tree_add_item(btamp_controller_entry_tree, hf_btamp_controller_status, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    return offset;
}

static int
dissect_discoverresponse(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
    guint16     length;
    guint16     idx = 1;
    proto_item *ti_controller_list;
    proto_tree *btamp_controller_list_tree;

    proto_tree_add_item(tree, hf_btamp_mtu, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    proto_tree_add_item(tree, hf_btamp_extfeatures, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    length = tvb_reported_length_remaining(tvb, offset);
    ti_controller_list = proto_tree_add_none_format(tree,
            hf_btamp_controller_list, tvb,
            offset, length,
            "Controller list");
    btamp_controller_list_tree = proto_item_add_subtree(ti_controller_list, ett_btamp_controller_list);

    while (tvb_reported_length_remaining(tvb, offset) >= 3) {
        offset = dissect_controller_entry(tvb, offset, pinfo, btamp_controller_list_tree, idx);
        idx += 1;
    }

    return offset;
}

static int
dissect_changenotify(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
    guint16     length;
    guint16     idx = 1;
    proto_item *ti_controller_list;
    proto_tree *btamp_controller_list_tree;

    length = tvb_reported_length_remaining(tvb, offset);
    ti_controller_list = proto_tree_add_none_format(tree,
            hf_btamp_controller_list, tvb,
            offset, length,
            "Controller list");
    btamp_controller_list_tree = proto_item_add_subtree(ti_controller_list, ett_btamp_controller_list);

    while (tvb_reported_length_remaining(tvb, offset) >= 3) {
        offset = dissect_controller_entry(tvb, offset, pinfo, btamp_controller_list_tree, idx);
        idx += 1;
    }

    return offset;
}

static int
dissect_changeresponse(tvbuff_t *tvb _U_, int offset, packet_info *pinfo _U_, proto_tree *tree _U_)
{
    return offset;
}

static int
dissect_getinforequest(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_btamp_controller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    return offset;
}

static int
dissect_getinforesponse(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
    proto_item *ti_controller;
    proto_tree *btamp_controller_tree;

    proto_tree_add_item(tree, hf_btamp_controller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    proto_tree_add_item(tree, hf_btamp_status, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    proto_tree_add_item(tree, hf_btamp_total_bw, tvb, offset, 4, ENC_LITTLE_ENDIAN);
    offset += 4;

    proto_tree_add_item(tree, hf_btamp_max_guaran_bw, tvb, offset, 4, ENC_LITTLE_ENDIAN);
    offset += 4;

    proto_tree_add_item(tree, hf_btamp_min_latency, tvb, offset, 4, ENC_LITTLE_ENDIAN);
    offset += 4;

    ti_controller = proto_tree_add_none_format(tree,
            hf_btamp_pal_caps_mask, tvb,
            offset, 2,
            "PAL Capabilities");
    btamp_controller_tree = proto_item_add_subtree(ti_controller, ett_btamp_caps);
    proto_tree_add_item(btamp_controller_tree, hf_btamp_pal_caps_guaranteed, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    proto_tree_add_item(tree, hf_btamp_amp_assoc_size, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    return offset;
}

static int
dissect_getampassocrequest(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_btamp_controller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    return offset;
}

static int
dissect_ampassoc(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_btamp_amp_assoc, tvb, offset, tvb_reported_length_remaining(tvb, offset), ENC_NA);
    return tvb_reported_length(tvb);
}

static int
dissect_getampassocresponse(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_btamp_controller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    proto_tree_add_item(tree, hf_btamp_status, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    offset = dissect_ampassoc(tvb, offset, pinfo, tree);

    return offset;
}

static int
dissect_createphysicalrequest(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_btamp_lcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    proto_tree_add_item(tree, hf_btamp_rcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    offset = dissect_ampassoc(tvb, offset, pinfo, tree);

    return offset;
}

static int
dissect_createphysicalresponse(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_btamp_lcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    proto_tree_add_item(tree, hf_btamp_rcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    proto_tree_add_item(tree, hf_btamp_status, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    return offset;
}

static int
dissect_discphysicalchanrequest(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_btamp_lcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    proto_tree_add_item(tree, hf_btamp_rcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    return offset;
}

static int
dissect_discphysicalchanresponse(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_btamp_lcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    proto_tree_add_item(tree, hf_btamp_rcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    proto_tree_add_item(tree, hf_btamp_controller_status, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    return offset;
}

static int
dissect_btamp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
    int         offset         = 0;
    proto_item *ti;
    proto_tree *btamp_tree;
    guint16     length;
    proto_item *ti_command;
    proto_tree *btamp_cmd_tree;
    guint8      cmd_code;
    guint16     cmd_length;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "AMP");

    switch (pinfo->p2p_dir) {
        case P2P_DIR_SENT:
            col_set_str(pinfo->cinfo, COL_INFO, "Sent ");
            break;
        case P2P_DIR_RECV:
            col_set_str(pinfo->cinfo, COL_INFO, "Rcvd ");
            break;
        default:
            col_set_str(pinfo->cinfo, COL_INFO, "UnknownDirection ");
            break;
    }

    ti = proto_tree_add_item(tree, proto_btamp, tvb, offset, -1, ENC_NA);
    btamp_tree = proto_item_add_subtree(ti, ett_btamp);

    length = tvb_reported_length_remaining(tvb, offset);
    ti_command = proto_tree_add_none_format(btamp_tree,
            hf_btamp_command, tvb,
            offset, length,
            "Command: ");
    btamp_cmd_tree = proto_item_add_subtree(ti_command, ett_btamp_cmd);

    cmd_code = tvb_get_guint8(tvb, offset);
    proto_tree_add_item(btamp_cmd_tree, hf_btamp_cmd_code,   tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    proto_tree_add_item(btamp_cmd_tree, hf_btamp_cmd_ident,  tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    cmd_length = tvb_get_letohs(tvb, offset);
    proto_tree_add_item(btamp_cmd_tree, hf_btamp_cmd_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    proto_item_set_len(ti_command, cmd_length+4);
    offset += 2;

    switch(cmd_code) {
    case 0x01: /* Command Reject */
        offset = dissect_comrej(tvb, offset, pinfo, btamp_cmd_tree);
        break;

    case 0x02: /* Discover Request */
        offset = dissect_discoverrequest(tvb, offset, pinfo, btamp_cmd_tree);
        break;

    case 0x03: /* Discover Response */
        offset = dissect_discoverresponse(tvb, offset, pinfo, btamp_cmd_tree);
        break;

    case 0x04: /* AMP Change Notify */
        offset = dissect_changenotify(tvb, offset, pinfo, btamp_cmd_tree);
        break;

    case 0x05: /* AMP Change Response */
        offset = dissect_changeresponse(tvb, offset, pinfo, btamp_cmd_tree);
        break;

    case 0x06: /* AMP Get Info Request */
        offset = dissect_getinforequest(tvb, offset, pinfo, btamp_cmd_tree);
        break;

    case 0x07: /* AMP Get Info Response */
        offset = dissect_getinforesponse(tvb, offset, pinfo, btamp_cmd_tree);
        break;

    case 0x08: /* Get AMP Assoc Request */
        offset = dissect_getampassocrequest(tvb, offset, pinfo, btamp_cmd_tree);
        break;

    case 0x09: /* Get AMP Assoc Response */
        offset = dissect_getampassocresponse(tvb, offset, pinfo, btamp_cmd_tree);
        break;

    case 0x0A: /* Create Physical Link Request */
        offset = dissect_createphysicalrequest(tvb, offset, pinfo, btamp_cmd_tree);
        break;

    case 0x0B: /* Create Physical Link Response */
        offset = dissect_createphysicalresponse(tvb, offset, pinfo, btamp_cmd_tree);
        break;

    case 0x0c: /* Disconnect Physical Link Request */
        offset = dissect_discphysicalchanrequest(tvb, offset, pinfo, btamp_cmd_tree);
        break;

    case 0x0d: /* Disconnect Physical Link Response */
        offset = dissect_discphysicalchanresponse(tvb, offset, pinfo, btamp_cmd_tree);
        break;

    default:
        proto_tree_add_item(btamp_cmd_tree, hf_btamp_cmd_data, tvb, offset, -1, ENC_NA);
        offset = tvb_reported_length(tvb);
        break;
    }

    proto_item_append_text(ti_command, "%s", val_to_str(cmd_code, command_code_vals, "Unknown PDU (%u)"));
    col_append_str(pinfo->cinfo, COL_INFO, val_to_str(cmd_code, command_code_vals, "Unknown PDU (%u)"));

    return offset;
}

/* Register the protocol with Wireshark */
void
proto_register_btamp(void)
{
    /* Setup list of header fields  See Section 1.6.1 for details*/
    static hf_register_info hf[] = {
        { &hf_btamp_command,
            { "Command",           "btamp.command",
                FT_NONE, BASE_NONE, NULL, 0x0,
                "L2CAP Command", HFILL }
        },
        { &hf_btamp_cmd_code,
            { "Command Code",           "btamp.cmd_code",
                FT_UINT8, BASE_HEX, VALS(command_code_vals), 0x0,
                "L2CAP Command Code", HFILL }
        },
        { &hf_btamp_cmd_ident,
            { "Command Identifier",           "btamp.cmd_ident",
                FT_UINT8, BASE_HEX, NULL, 0x0,
                "L2CAP Command Identifier", HFILL }
        },
        { &hf_btamp_cmd_length,
            { "Command Length",           "btamp.cmd_length",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "L2CAP Command Length", HFILL }
        },
        { &hf_btamp_cmd_data,
            { "Command Data",           "btamp.cmd_data",
                FT_NONE, BASE_NONE, NULL, 0x0,
                "L2CAP Command Data", HFILL }
        },
        { &hf_btamp_rej_reason,
            { "Reason",           "btamp.rej_reason",
                FT_UINT16, BASE_HEX, VALS(reason_vals), 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_mtu,
            { "MPS/MTU",           "btamp.mps",
                FT_UINT16, BASE_HEX, NULL, 0x0,
                "MPS/MTU Size", HFILL }
        },
        { &hf_btamp_extfeatures,
            { "Extended Features",           "btamp.extfeatures",
                FT_UINT16, BASE_HEX, NULL, 0x0,
                "Extended Features Mask", HFILL }
        },
        { &hf_btamp_controllers,
            { "Controller entry",           "btamp.ctrl_entry",
                FT_NONE, BASE_NONE, NULL, 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_controller_list,
            { "Controller list",           "btamp.ctrl_list",
                FT_NONE, BASE_NONE, NULL, 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_lcontroller_id,
            { "Local Controller ID",           "btamp.lctrl_id",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_rcontroller_id,
            { "Remote Controller ID",           "btamp.rctrl_id",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_controller_id,
            { "Controller ID",           "btamp.ctrl_id",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_controller_type,
            { "Controller Type",           "btamp.ctrl_type",
                FT_UINT8, BASE_DEC, VALS(controller_type_vals), 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_controller_status,
            { "Controller Status",           "btamp.ctrl_status",
                FT_UINT8, BASE_DEC, VALS(controller_status_vals), 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_status,
            { "Status",           "btamp.status",
                FT_UINT8, BASE_DEC, VALS(status_vals), 0x0,
                NULL, HFILL }
        },
#if 0
        { &hf_btamp_create_status,
            { "Status",           "btamp.create_status",
                FT_UINT8, BASE_DEC, VALS(create_status_vals), 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_disc_status,
            { "Status",           "btamp.disc_status",
                FT_UINT8, BASE_DEC, VALS(disc_status_vals), 0x0,
                NULL, HFILL }
        },
#endif
        { &hf_btamp_pal_caps_mask,
            { "PAL Capabilities Mask",           "btamp.pal_caps_mask",
                FT_NONE, BASE_NONE, NULL, 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_pal_caps_guaranteed,
            { "Guaranteed Service type",           "btamp.guaranteed_type",
                FT_BOOLEAN, 16, NULL, 0x01,
                NULL, HFILL }
        },
        { &hf_btamp_total_bw,
            { "Total Bandwidth",           "btamp.total_bw",
                FT_UINT32, BASE_HEX, NULL, 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_max_guaran_bw,
            { "Max Guaranteed Bandwidth",           "btamp.max_guaran_bw",
                FT_UINT32, BASE_HEX, NULL, 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_min_latency,
            { "Minimum latency",           "btamp.min_latency",
                FT_UINT32, BASE_HEX, NULL, 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_amp_assoc_size,
            { "Assoc Size",           "btamp.assoc_size",
                FT_UINT16, BASE_HEX, NULL, 0x0,
                NULL, HFILL }
        },
        { &hf_btamp_amp_assoc,
            { "Assoc",        "btamp.assoc",
                FT_BYTES, BASE_NONE, NULL, 0x0,
                NULL, HFILL }
        },
    };

    /* Setup protocol subtree array */
    static gint *ett[] = {
        &ett_btamp,
        &ett_btamp_cmd,
        &ett_btamp_caps,
        &ett_btamp_controller_entry,
        &ett_btamp_controller_list,
    };

    /* Register the protocol name and description */
    proto_btamp = proto_register_protocol("Bluetooth AMP Packet", "BT AMP", "btamp");

    btamp_handle = register_dissector("btamp", dissect_btamp, proto_btamp);

    /* Required function calls to register the header fields and subtrees used */
    proto_register_field_array(proto_btamp, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));
}

void
proto_reg_handoff_btamp(void)
{
    dissector_add_uint("btl2cap.cid", BTL2CAP_FIXED_CID_AMP_MAN, btamp_handle);
}

/*
 * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */
