/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * qmi-firmware-update -- Command line tool to update firmware in QMI devices
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright (C) 2016 Bjørn Mork <bjorn@mork.no>
 * Copyright (C) 2016 Zodiac Inflight Innovations
 * Copyright (C) 2016 Aleksander Morgado <aleksander@aleksander.es>
 *
 * crc16 and HDLC escape code borrowed from modemmanager/libqcdm
 * Copyright (C) 2010 Red Hat, Inc.
 */

#include <stdio.h>
#include <string.h>

#include <glib.h>
#include <gio/gio.h>

#include "qfu-utils.h"

/******************************************************************************/

gchar *
qfu_utils_str_hex (gconstpointer mem,
                   gsize         size,
                   gchar         delimiter)
{
    const guint8 *data = mem;
    gsize         i;
    gsize         j;
    gsize         new_str_length;
    gchar        *new_str;

    /* Get new string length. If input string has N bytes, we need:
     * - 1 byte for last NUL char
     * - 2N bytes for hexadecimal char representation of each byte...
     * - N-1 bytes for the separator ':'
     * So... a total of (1+2N+N-1) = 3N bytes are needed... */
    new_str_length =  3 * size;

    /* Allocate memory for new array and initialize contents to NUL */
    new_str = g_malloc0 (new_str_length);

    /* Print hexadecimal representation of each byte... */
    for (i = 0, j = 0; i < size; i++, j += 3) {
        /* Print character in output string... */
        snprintf (&new_str[j], 3, "%02X", data[i]);
        /* And if needed, add separator */
        if (i != (size - 1) )
            new_str[j + 2] = delimiter;
    }

    /* Set output string */
    return new_str;
}

/******************************************************************************/

gchar *
qfu_utils_get_firmware_image_unique_id_printable (const GArray *unique_id)
{
    gchar    *unique_id_str;
    guint     i;
    guint     n_ascii = 0;
    gboolean  end = FALSE;

#define UNIQUE_ID_LEN 16

    g_warn_if_fail (unique_id->len <= UNIQUE_ID_LEN);
    unique_id_str = g_malloc0 (UNIQUE_ID_LEN + 1);
    memcpy (unique_id_str, unique_id->data, UNIQUE_ID_LEN);

    /* We want an ASCII string that, if finished before the 16 bytes,
     * is suffixed with NUL bytes. */
    for (i = 0; i < UNIQUE_ID_LEN; i++) {
        /* If a byte isn't ASCII, stop */
        if (unique_id_str[i] & 0x80)
            break;
        /* If string isn't finished yet... */
        if (!end) {
            /* String finished now */
            if (unique_id_str[i] == '\0')
                end = TRUE;
            else
                n_ascii++;
        } else {
            /* String finished but we then got
             * another ASCII byte? not possible */
            if (unique_id_str[i] != '\0')
                break;
        }
    }

    if (i == UNIQUE_ID_LEN && n_ascii > 0)
        return unique_id_str;

#undef UNIQUE_ID_LEN

    g_free (unique_id_str);

    /* Get a raw hex string otherwise */
    unique_id_str = qfu_utils_str_hex (unique_id->data, unique_id->len, ':');

    return unique_id_str;
}

/******************************************************************************/

/* Table of CRCs for each possible byte, with a generator polynomial of 0x8408 */
static const guint16 crc_table[256] = {
    0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
    0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
    0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
    0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
    0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
    0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
    0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
    0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
    0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
    0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
    0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
    0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
    0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
    0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
    0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
    0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
    0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
    0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
    0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
    0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
    0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
    0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
    0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
    0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
    0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
    0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
    0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
    0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
    0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
    0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
    0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
    0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};

/* Calculate the CRC for a buffer using a seed of 0xffff */
guint16
qfu_utils_crc16 (const guint8 *buffer,
                 gsize         len)
{
    guint16 crc = 0xffff;

    while (len--)
            crc = crc_table[(crc ^ *buffer++) & 0xff] ^ (crc >> 8);
    return ~crc;
}

/******************************************************************************/

gboolean
qfu_utils_parse_cwe_version_string (const gchar  *version,
                                    gchar       **firmware_version,
                                    gchar       **config_version,
                                    gchar       **carrier,
                                    GError      **error)
{
    GRegex     *regex;
    GMatchInfo *match_info = NULL;
    gboolean    result = FALSE;

    regex = g_regex_new ("(?:.*)"
                         "_([0-9][0-9]\\.[0-9][0-9]\\.[0-9][0-9]\\.[0-9][0-9])" /* firmware version */
                         "(?:"
                             "(?:.*)"
                             "_([a-zA-Z\\-]+)" /* carrier */
                             "_([0-9][0-9][0-9]\\.[0-9][0-9][0-9]_[0-9][0-9][0-9])" /* config version */
                         ")?",
                         0, 0, NULL);
    g_assert (regex);

    if (!g_regex_match_full (regex, version, strlen (version), 0, 0, &match_info, NULL)) {
        g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
                     "couldn't parse CWE version string '%s': didn't match",
                     version);
        goto out;
    }

    if (firmware_version)
        *firmware_version = g_match_info_fetch (match_info, 1);
    if (carrier)
        *carrier = (g_match_info_get_match_count (match_info) > 2 ? g_match_info_fetch (match_info, 2) : NULL);
    if (config_version)
        *config_version = (g_match_info_get_match_count (match_info) > 3 ? g_match_info_fetch (match_info, 3) : NULL);

    result = TRUE;

out:
    if (match_info)
        g_match_info_free (match_info);
    g_regex_unref (regex);

    return result;
}

/******************************************************************************/

#define QMI_CLIENT_RETRIES 3

typedef struct {
    QmiDevice    *qmi_device;
    gboolean      device_open_proxy;
    gboolean      device_open_mbim;
    gint          qmi_client_retries;
    QmiClientDms *qmi_client;
} NewClientDmsContext;

static void
new_client_dms_context_free (NewClientDmsContext *ctx)
{
    if (ctx->qmi_client)
        g_object_unref (ctx->qmi_client);
    if (ctx->qmi_device)
        g_object_unref (ctx->qmi_device);
    g_slice_free (NewClientDmsContext, ctx);
}

gboolean
qfu_utils_new_client_dms_finish (GAsyncResult  *res,
                                 QmiDevice    **qmi_device,
                                 QmiClientDms **qmi_client,
                                 GError       **error)
{
    NewClientDmsContext *ctx;

    if (!g_task_propagate_boolean (G_TASK (res), error))
        return FALSE;

    ctx = (NewClientDmsContext *) g_task_get_task_data (G_TASK (res));
    if (qmi_device)
        *qmi_device = g_object_ref (ctx->qmi_device);
    if (qmi_client)
        *qmi_client = g_object_ref (ctx->qmi_client);
    return TRUE;
}

static void retry_allocate_qmi_client (GTask *task);

static void
qmi_client_ready (QmiDevice    *device,
                  GAsyncResult *res,
                  GTask        *task)
{
    NewClientDmsContext *ctx;
    GError              *error = NULL;

    ctx = (NewClientDmsContext *) g_task_get_task_data (task);

    ctx->qmi_client = QMI_CLIENT_DMS (qmi_device_allocate_client_finish (device, res, &error));
    if (!ctx->qmi_client) {
        /* If this was the last attempt, error out */
        if (!ctx->qmi_client_retries) {
            g_prefix_error (&error, "couldn't allocate DMS QMI client: ");
            g_task_return_error (task, error);
            g_object_unref (task);
            return;
        }

        /* Retry allocation */
        g_debug ("[qfu,utils] DMS QMI client allocation failed: %s", error->message);
        g_error_free (error);

        g_debug ("[qfu,utils] retrying...");
        retry_allocate_qmi_client (task);
        return;
    }

    g_debug ("[qfu,utils] DMS QMI client allocated");
    g_task_return_boolean (task, TRUE);
    g_object_unref (task);
}

static void
retry_allocate_qmi_client (GTask *task)
{
    NewClientDmsContext *ctx;

    ctx = (NewClientDmsContext *) g_task_get_task_data (task);

    /* Consume one retry attempt */
    ctx->qmi_client_retries--;
    g_assert (ctx->qmi_client_retries >= 0);

    g_debug ("[qfu,utils] allocating new DMS QMI client...");
    qmi_device_allocate_client (ctx->qmi_device,
                                QMI_SERVICE_DMS,
                                QMI_CID_NONE,
                                10,
                                g_task_get_cancellable (task),
                                (GAsyncReadyCallback) qmi_client_ready,
                                task);
}

static void
qmi_device_open_ready (QmiDevice    *device,
                       GAsyncResult *res,
                       GTask        *task)
{
    GError *error = NULL;

    if (!qmi_device_open_finish (device, res, &error)) {
        g_prefix_error (&error, "couldn't open QMI device: ");
        g_task_return_error (task, error);
        g_object_unref (task);
        return;
    }

    g_debug ("[qfu,utils] QMI device open");
    retry_allocate_qmi_client (task);
}

static void
qmi_device_ready (GObject      *source,
                  GAsyncResult *res,
                  GTask        *task)
{
    NewClientDmsContext *ctx;
    GError              *error = NULL;
    QmiDeviceOpenFlags   flags = QMI_DEVICE_OPEN_FLAGS_NONE;

    ctx = (NewClientDmsContext *) g_task_get_task_data (task);

    ctx->qmi_device = qmi_device_new_finish (res, &error);
    if (!ctx->qmi_device) {
        g_prefix_error (&error, "couldn't create QMI device: ");
        g_task_return_error (task, error);
        g_object_unref (task);
        return;
    }

    g_debug ("[qfu,utils] QMI device created");

    if (ctx->device_open_proxy)
        flags |= QMI_DEVICE_OPEN_FLAGS_PROXY;
    if (ctx->device_open_mbim)
        flags |= QMI_DEVICE_OPEN_FLAGS_MBIM;

    g_debug ("[qfu,utils] opening QMI device (%s proxy, %s mode)...",
             ctx->device_open_proxy ? "with" : "without",
             ctx->device_open_mbim ? "mbim" : "qmi");
    qmi_device_open (ctx->qmi_device,
                     flags,
                     20,
                     g_task_get_cancellable (task),
                     (GAsyncReadyCallback) qmi_device_open_ready,
                     task);
}

void
qfu_utils_new_client_dms (GFile               *cdc_wdm_file,
                          gboolean             device_open_proxy,
                          gboolean             device_open_mbim,
                          GCancellable        *cancellable,
                          GAsyncReadyCallback  callback,
                          gpointer             user_data)
{
    GTask               *task;
    NewClientDmsContext *ctx;

    ctx = g_slice_new0 (NewClientDmsContext);
    ctx->device_open_proxy  = device_open_proxy;
    ctx->device_open_mbim   = device_open_mbim;
    ctx->qmi_client_retries = QMI_CLIENT_RETRIES;

    task = g_task_new (NULL, cancellable, callback, user_data);
    g_task_set_task_data (task, ctx, (GDestroyNotify) new_client_dms_context_free);

    g_debug ("[qfu,utils] creating QMI device...");
    qmi_device_new (cdc_wdm_file,
                    g_task_get_cancellable (task),
                    (GAsyncReadyCallback) qmi_device_ready,
                    task);
}