code_device/hgdriver/hgdev/scanner_manager.cpp

#include "scanner_manager.h"
#include "../../sdk/hginclude/hg_log.h"
#include <iostream>
#include <string.h>
#include "raw_src.h"
#include "char_const.h"

// kinds of scanners ...
#define SCAN_PTR(ptr)   ((hg_scanner*)ptr)

#include "hg_scanner_200.h"
#include "hg_scanner_239.h"
#include "hg_scanner_300.h"
#include "hg_scanner_400.h"

/// <summary>
/// supporting devices :
static struct
{
    uint16_t    vid;        // vendor ID
    uint16_t    pid;        // product ID
    std::string name;       // product name
    std::string type;       // product type
    std::string rsc;        // USB resource, version-addr. e.g. "USB2.0-1"
}
g_supporting_devices[] = {
#ifdef OEM_LISICHENG
                           {0x31c9, 0x8420, SCANNER_NAME_LSC_G42S, "G426xF", ""}
                         , {0x31c9, 0x8520, SCANNER_NAME_LSC_G52S, "G52x0F", ""}
                         , {0x31c9, 0x8620, SCANNER_NAME_LSC_G62S, "G6290U", ""}
                         , {0x31c9, 0x8629, SCANNER_NAME_LSC_G62S, "G6290U", ""}
                         , {0x31c9, 0x8730, SCANNER_NAME_LSC_G73S, "G73x0U", ""}
                         , {0x31c9, 0x8739, SCANNER_NAME_LSC_G73S, "G73x0U", ""},
#endif
#ifdef OEM_HANWANG
                           {0x2903, 0x7000, SCANNER_NAME_HW_7000, "HW-74x0WA", ""}
                         , {0x2903, 0x1000, SCANNER_NAME_HW_1060A, "HW-1060A", ""}
                         , {0x2903, 0x8000, SCANNER_NAME_HW_8090F, "HW-8090F", ""}
                         , {0x2903, 0x9000, SCANNER_NAME_HW_9110F, "HW-9110F", ""},
#endif
                           {0x3072, 0x100, SCANNER_NAME_HG_G100, "GScanO200", ""}
                         , {0x3072, 0x200, SCANNER_NAME_HG_G200, "GScanO200", ""}
                         , {0x3072, 0x300, SCANNER_NAME_HG_G300, "GScanO400", ""}
                         , {0x3072, 0x400, SCANNER_NAME_HG_G400, "GScanO400", ""}
                         , {0x3072, 0x139, SCANNER_NAME_HG_G139, "GScanO1003399", ""}
                         , {0x3072, 0x239, SCANNER_NAME_HG_G239, "GScanO1003399", ""}
                         , {0x3072, 0x339, SCANNER_NAME_HG_G339, "GScanO1003399", ""}
                         , {0x3072, 0x439, SCANNER_NAME_HG_G439, "GScanO1003399", ""}
                         , {0x064B, 0x7823, SCANNER_NAME_HG_G200, "GScanO200", ""}
                         };
static std::string g_vendor = COMPANY_NAME;

#define BRAND_LOGO_SIZE                 8 * 1024

#define MOVE_TO_NEXT_STR(str)           str += strlen(str) + 1
/// </summary>


hg_scanner_mgr* hg_scanner_mgr::inst_ = NULL;
sane_callback hg_scanner_mgr::event_callback_ = NULL;
bool          hg_scanner_mgr::async_io_enabled_ = false;
int           hg_scanner_mgr::ver_major_ = 1;
int           hg_scanner_mgr::ver_minor_ = 0;
int           hg_scanner_mgr::ver_build_ = 0;
int           hg_scanner_mgr::ver_patch_ = 1;

hg_scanner_mgr::hg_scanner_mgr() : same_ind_(1)
{
    usb_manager::instance()->register_hotplug(&hg_scanner_mgr::usb_event_handle, this);
}
hg_scanner_mgr::~hg_scanner_mgr()
{
    usb_manager::clear();
}

int hg_scanner_mgr::ui_default_callback(scanner_handle h, int ev, void* data, unsigned int* len, void* param)
{
    // if (!hg_scanner_mgr::async_io_enabled_ &&
    //     ev == SANE_EVENT_IS_MEMORY_ENOUGH)
    // {
    //     struct sysinfo si;
    //     if(sysinfo(&si) == 0)
    //         return si.freeram * si.mem_unit > *len + 200 * 1024 * 1024 ? SCANNER_ERR_OK : SCANNER_ERR_INSUFFICIENT_MEMORY;

    //     return SCANNER_ERR_OK;
    // }

    if (hg_scanner_mgr::event_callback_)
        return hg_scanner_mgr::event_callback_(h, ev, data, len, param);

    return SCANNER_ERR_OK;
}
hg_scanner_mgr* hg_scanner_mgr::instance(sane_callback cb)
{
    if (!hg_scanner_mgr::inst_)
    {
        hg_scanner_mgr::event_callback_ = cb;
        if (cb)
            hg_scanner_mgr::async_io_enabled_ = cb(NULL, SANE_EVENT_SUPPORT_ASYNC_IO, NULL, NULL, NULL) == 0;
        hg_scanner_mgr::inst_ = new hg_scanner_mgr();
        HG_VLOG_MINI_1(LOG_LEVEL_DEBUG_INFO, "async image transferring is %s\n", hg_scanner_mgr::async_io_enabled_ ? "enabled" : "disabled");
    }

    return hg_scanner_mgr::inst_;
}
void hg_scanner_mgr::clear(void)
{
    if (hg_scanner_mgr::inst_)
    {
        {
            std::lock_guard<std::mutex>    lock(hg_scanner_mgr::inst_->mutex_dev_);
            hg_scanner_mgr::event_callback_ = nullptr;
        }
        delete hg_scanner_mgr::inst_;
        hg_scanner_mgr::inst_ = NULL;
    }
}
void hg_scanner_mgr::set_version(int hh, int hl, int lh, int ll)
{
    hg_scanner_mgr::ver_major_ = hh;
    hg_scanner_mgr::ver_minor_ = hl;
    hg_scanner_mgr::ver_build_ = lh;
    hg_scanner_mgr::ver_patch_ = ll;
}

void hg_scanner_mgr::usb_event_handle(usb_event ev, libusb_device* device, int vid, int pid, int usb_ver_h, int usb_ver_l, bool* retry, void* user) // usb_ver_h.usb_ver_l
{
    hg_scanner_mgr* obj = (hg_scanner_mgr*)user;
    
    obj->on_hgscanner_pnp(ev, device, vid, pid, usb_ver_h, usb_ver_l, retry);
}

void hg_scanner_mgr::on_hgscanner_pnp(usb_event ev, libusb_device* device, int vid, int pid, int usb_ver_h, int usb_ver_l, bool* retry)
{
    char    model[40],
            vendor[40];
    SANE_Device_Ex de;
    int     ev_ui = 0;
    scanner_handle h = NULL;
    unsigned int len = sizeof(de);
    std::string name(""), type("");
    std::lock_guard<std::mutex>    lock(mutex_dev_);

    sprintf(model, "%x", pid);
    sprintf(vendor, "%x", vid);
    de.model = model;
    de.name = NULL;
    de.type = NULL;
    de.vendor = vendor;
    de.openned = SANE_FALSE;

    if (ev == USB_EVENT_DEVICE_ARRIVED)
    {
        int index = -1;
        for (int i = 0; i < _countof(g_supporting_devices); ++i)
        {
            if (g_supporting_devices[i].vid == vid && g_supporting_devices[i].pid == pid)
            {
                HG_VLOG_MINI_1(LOG_LEVEL_DEBUG_INFO, "%s connected.\n", g_supporting_devices[i].name.c_str());
                index = i;
                ev_ui = SANE_EVENT_DEVICE_ARRIVED;
                de.name = g_supporting_devices[i].name.c_str();
                de.type = g_supporting_devices[i].type.c_str();
                break;
            }
        }

        if (index != -1)
        {
            bool add = true;
            for (size_t i = 0; i < online_devices_.size(); ++i)
            {
                if (online_devices_[i].dev == device)
                {
                    online_devices_[i].ind = index;
                    add = false;
                    break;
                }
                else if (online_devices_[i].scanner && !online_devices_[i].scanner->is_online()
                    && online_devices_[i].scanner->get_pid() == pid && online_devices_[i].scanner->get_vid() == vid)
                {
                    usb_io* io = NULL;

                    name = online_devices_[i].display_name;
                    type = g_supporting_devices[index].type;
                    online_devices_[i].dev = device;
                    h = online_devices_[i].scanner;
                    if (pid == 0x300 || pid == 0x400)
                        std::this_thread::sleep_for(std::chrono::milliseconds(1000));
                    len = usb_manager::instance()->open(device, &io);
                    if (len == SCANNER_ERR_OK)
                    {
                        HG_VLOG_MINI_3(LOG_LEVEL_WARNING, "[%04x:%04x]%s re-connected.\n", pid, vid, online_devices_[i].display_name.c_str());
                        online_devices_[i].scanner->reset_io(io);
                        de.openned = SANE_TRUE;
                    }
                    if (io)
                        io->release();
                    add = false;
                    break;
                }
            }

            if (add)
            {
                OLSCANNER ols;

                ols.dev = device;
                ols.ind = index;
                ols.scanner = NULL;
                ols.display_name = g_supporting_devices[ols.ind].name;
                if (std::find(online_devices_.begin(), online_devices_.end(), ols.ind) != online_devices_.end())
                {
                    char buf[40];

                    sprintf(buf, " - %u", same_ind_++);
                    ols.display_name += buf;
                }
                online_devices_.push_back(ols);
                name = ols.display_name;
                type = g_supporting_devices[ols.ind].type;
            }
        }
    }
    else if (ev == USB_EVENT_DEVICE_LEFT)
    {
        std::vector<OLSCANNER>::iterator it = std::find(online_devices_.begin(), online_devices_.end(), device);
        if (it != online_devices_.end())
        {
            ev_ui = SANE_EVENT_DEVICE_LEFT;
            name = it->display_name;
            type = g_supporting_devices[it->ind].type;
            h = it->scanner;
            HG_VLOG_MINI_1(LOG_LEVEL_DEBUG_INFO, "%s Dis-connected.\n", name.c_str());
            if (it->scanner)
                it->scanner->io_disconnected();
            else
                online_devices_.erase(it);
        }
    }

    if (ev_ui)
    {
        de.name = name.c_str();
        de.type = type.c_str();
        hg_scanner_mgr::ui_default_callback(h, ev_ui, &de, &len, NULL);
    }
}
void hg_scanner_mgr::get_online_devices(std::vector<OLSCANNER>& devs)
{
    std::lock_guard<std::mutex>    lock(mutex_dev_);

    devs = online_devices_;
}

void hg_scanner_mgr::set_appendix_info_for_about(SANE_About* about, char*& ptr, int& count, const char* key, const char* info, const char* url)
{
#ifdef BRAND_DISPLAY_ALL_EXPAND
    if (!info || *info == 0)
        info = BRAND_COMMUNICATION_FAIL;
#endif

    if (info && strlen(info))
    {
        about->appendix[count].key = ptr;
        strcpy(ptr, key);
        MOVE_TO_NEXT_STR(ptr);

        about->appendix[count].content = ptr;
        strcpy(ptr, info);
        MOVE_TO_NEXT_STR(ptr);

        if (url)
        {
            about->appendix[count++].url = ptr;
            strcpy(ptr, url);
            MOVE_TO_NEXT_STR(ptr);
        }
        else
            count++;
    }
}
scanner_err hg_scanner_mgr::get_about_info(scanner_handle h, void* data, unsigned* len)
{
    hg_scanner* scanner = (hg_scanner*)h;
    unsigned    bytes = sizeof(SANE_About) + 40;
    SANE_About  tmp;

    bytes += sizeof(g_logo);
    bytes += strlen(BRAND_APP_NAME) + 8;
    bytes += strlen(BRAND_TITLE_VERSION) + 8;
    bytes += strlen(BRAND_TITLE_COPYRIGHT) + 8;
    bytes += strlen(BRAND_COPYRIGHT) + 8;
    bytes += strlen(BRAND_TITE_MANUFACTOR) + 8;
    bytes += strlen(BRAND_TITLE_URL) + 8;
    bytes += strlen(BRAND_COMPANY_URL) + 8;
    bytes += strlen(BRAND_URL_COMPANY_URL) + 8;
    bytes += strlen(BRAND_TITLE_TEL) + 8;
    bytes += strlen(BRAND_COMPANY_TEL) + 8;
    bytes += strlen(BRAND_TITLE_ADDRESS) + 8;
    bytes += strlen(BRAND_COMPANY_ADDRESS) + 8;
    bytes += strlen(BRAND_TITLE_GPS) + 8;
    bytes += strlen(BRAND_COMPANY_GPS) + 8;
    bytes += strlen(BRAND_URL_GPS) + 8;
    // bytes += 5 * sizeof(tmp.appendix[0]);

#ifndef BRAND_DISPLAY_ALL_EXPAND
    if (scanner)
#endif
    {
        bytes += sizeof(tmp.appendix[0]) + BRAND_INFO_MAX_LENGTH + 8 + strlen(BRAND_TITLE_FIRM_VERSION) + 8;
        bytes += sizeof(tmp.appendix[0]) + BRAND_INFO_MAX_LENGTH + 8 + strlen(BRAND_TITLE_SERIAL_NUM) + 8;
        bytes += sizeof(tmp.appendix[0]) + BRAND_INFO_MAX_LENGTH + 8 + strlen(BRAND_TITLE_IP) + 8;
        bytes += sizeof(tmp.appendix[0]) + 28 + strlen(BRAND_TITLE_ROLLER_COUNT) + 8;
        bytes += sizeof(tmp.appendix[0]) + 28 + strlen(BRAND_TITLE_HISTORY_COUNT) + 8;
        bytes += sizeof(tmp.appendix[0]);
    }

    if (!data || *len < bytes)
    {
        *len = bytes;

        return SCANNER_ERR_INSUFFICIENT_MEMORY;
    }

    // filling info to flat buffer ...
    SANE_About* about = (SANE_About*)data;
    std::string info("");
    char* ptr = (char*)data + sizeof(SANE_About) + 9 * sizeof(about->appendix[0]);

    about->title = ptr;
    strcpy(ptr, BRAND_APP_NAME);
    MOVE_TO_NEXT_STR(ptr);

    about->version = ptr;
    sprintf(ptr, "%d.%d.%d.%d", hg_scanner_mgr::ver_major_, hg_scanner_mgr::ver_minor_, hg_scanner_mgr::ver_build_, hg_scanner_mgr::ver_patch_);
    MOVE_TO_NEXT_STR(ptr);

    about->copyright = ptr;
    strcpy(ptr, BRAND_COPYRIGHT);
    MOVE_TO_NEXT_STR(ptr);

    about->logo_bytes = sizeof(g_logo);;
    memcpy(ptr, g_logo, about->logo_bytes);
    ptr += about->logo_bytes + 1;

    int count = 0, rolls = 0;

    set_appendix_info_for_about(about, ptr, count, BRAND_TITE_MANUFACTOR, g_vendor.c_str(), NULL);
    set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_URL, BRAND_COMPANY_URL, BRAND_URL_COMPANY_URL);
    set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_TEL, BRAND_COMPANY_TEL, NULL);
    set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_ADDRESS, BRAND_COMPANY_ADDRESS, NULL);
    set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_GPS, BRAND_COMPANY_GPS, BRAND_URL_GPS);

    if (scanner)
    {        
        set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_FIRM_VERSION, scanner->get_firmware_version().c_str(), NULL);
        set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_SERIAL_NUM, scanner->get_serial_num().c_str(), NULL);
        set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_IP, scanner->get_ip().c_str(), NULL);
        rolls = scanner->get_roller_num();
        if (rolls >= 0)
        {
            char buf[40];
            sprintf(buf, "%u", rolls);
            set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_ROLLER_COUNT, buf, NULL);
        }
#ifdef BRAND_DISPLAY_ALL_EXPAND
        else
            set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_ROLLER_COUNT, rolls == -1 ? BRAND_COMMUNICATION_FAIL : BRAND_DEVICE_NOT_SUPPORT, NULL);
#endif

        rolls = scanner->get_history_count();
        if (rolls >= 0)
        {
            char buf[40];
            sprintf(buf, "%u", rolls);
            set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_HISTORY_COUNT, buf, NULL);
        }
#ifdef BRAND_DISPLAY_ALL_EXPAND
        else
            set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_HISTORY_COUNT, rolls == -1 ? BRAND_COMMUNICATION_FAIL : BRAND_DEVICE_NOT_SUPPORT, NULL);
#endif
    }
#ifdef BRAND_DISPLAY_ALL_EXPAND
    else
    {
        set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_FIRM_VERSION, BRAND_NO_DEVICE, NULL);
        set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_SERIAL_NUM, BRAND_NO_DEVICE, NULL);
        set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_IP, BRAND_NO_DEVICE, NULL);
        set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_ROLLER_COUNT, BRAND_NO_DEVICE, NULL);
        set_appendix_info_for_about(about, ptr, count, BRAND_TITLE_HISTORY_COUNT, BRAND_NO_DEVICE, NULL);
    }
#endif

    about->appendix[count].key = NULL;
    about->appendix[count].content = NULL;
    about->appendix[count].url = NULL;

    return SCANNER_ERR_OK;
}

scanner_err hg_scanner_mgr::hg_scanner_enum(ScannerInfo* scanner_list, long* count, bool local_only)
{
    std::vector<OLSCANNER> devusbuf;
    long        size = *count;
    scanner_err      ret = SCANNER_ERR_OK;

    get_online_devices(devusbuf);
    *count = devusbuf.size();
	if (*count > size)
	{
        ret = SCANNER_ERR_INSUFFICIENT_MEMORY;
	}
    else
    {
        for (size_t i = 0; i < devusbuf.size(); i++)
        {
            strcpy(scanner_list->name, g_supporting_devices[devusbuf[i].ind].name.c_str());
            strcpy(scanner_list->type, g_supporting_devices[devusbuf[i].ind].type.c_str());
            sprintf(scanner_list->model, "%x", g_supporting_devices[devusbuf[i].ind].pid);
            strcpy(scanner_list->vendor, g_vendor.c_str());
            scanner_list++;
        }
    }

	return ret;
}
scanner_err hg_scanner_mgr::hg_scanner_open(scanner_handle* h, const char* name, bool shared, const char* user, const char* pwd, const char* check, char* rsc)
{
    std::vector<OLSCANNER> devs;
    std::vector<OLSCANNER>::iterator it;
    usb_io* io = NULL;
    scanner_err ret = SCANNER_ERR_DEVICE_NOT_FOUND;

    *h = NULL;
    get_online_devices(devs);
    it = std::find(devs.begin(), devs.end(), name);
    if (it != devs.end())
    {
        std::string msg("");
        ret = (scanner_err)usb_manager::instance()->open(it->dev, &io, &msg);
        if (ret == SCANNER_ERR_OK)
        {
            hg_scanner* scanner = NULL;
            if (g_supporting_devices[it->ind].pid == 0x100 || 
                g_supporting_devices[it->ind].pid == 0x200 ||
                g_supporting_devices[it->ind].pid == 0x8620||
                g_supporting_devices[it->ind].pid == 0x8730 )
            {
                hg_scanner_200* s200 = new hg_scanner_200(g_supporting_devices[it->ind].name.c_str(), 0x100, io);

                scanner = dynamic_cast<hg_scanner*>(s200);
                *h = (scanner_handle)s200;
            }
            else if (g_supporting_devices[it->ind].pid == 0x239 || 
                     g_supporting_devices[it->ind].pid == 0x139 ||
                     g_supporting_devices[it->ind].pid == 0x8000||
                     g_supporting_devices[it->ind].pid == 0x8739||
                     g_supporting_devices[it->ind].pid == 0x8629 )
            {
                hg_scanner_239* s239 = new hg_scanner_239(g_supporting_devices[it->ind].name.c_str(),0x239, io);

                scanner = dynamic_cast<hg_scanner*>(s239);
                *h = (scanner_handle)s239;
            }
            else if (g_supporting_devices[it->ind].pid == 0x400 ||
                     g_supporting_devices[it->ind].pid == 0x7000||
                     g_supporting_devices[it->ind].pid == 0x8520)
            {
                hg_scanner_400* s400 = new hg_scanner_400(g_supporting_devices[it->ind].name.c_str(), 0x400, io);
                scanner = dynamic_cast<hg_scanner*>(s400);
                *h = (scanner_handle)s400;
            }
            else if (g_supporting_devices[it->ind].pid == 0x300 ||
                     g_supporting_devices[it->ind].pid == 0x1000||
                     g_supporting_devices[it->ind].pid == 0x8420)
            {
                hg_scanner_300* s300 = new hg_scanner_300(g_supporting_devices[it->ind].name.c_str(),0x300, io);
                scanner = dynamic_cast<hg_scanner*>(s300);
                *h = (scanner_handle)s300;
            }

            if (scanner)
            {
                scanner->set_ui_callback(&hg_scanner_mgr::ui_default_callback, hg_scanner_mgr::async_io_enabled_);
            }

            std::lock_guard<std::mutex>      lock(mutex_dev_);
            std::vector<OLSCANNER>::iterator ptr = std::find(online_devices_.begin(), online_devices_.end(), name);
            if (ptr != online_devices_.end())
                ptr->scanner = (hg_scanner*)*h;
        }
        else if(msg.length())
            hg_scanner_mgr::ui_default_callback(nullptr, SANE_EVENT_ERROR, (void*)msg.c_str(), (unsigned int*)&ret, nullptr);

        if(io)
            io->release();
    }

    return *h ? SCANNER_ERR_OK : ret;
}
scanner_err hg_scanner_mgr::hg_scanner_close(scanner_handle h, bool force)
{
    {
        std::lock_guard<std::mutex>      lock(mutex_dev_);
        for (size_t i = 0; i < online_devices_.size(); ++i)
        {
            if (online_devices_[i].scanner == h)
            {
                online_devices_[i].scanner = NULL;
                break;
            }
        }
    }

    SCAN_PTR(h)->close(force);
    delete SCAN_PTR(h);

	return SCANNER_ERR_OK;
}
scanner_err hg_scanner_mgr::hg_scanner_get_parameter(scanner_handle h, unsigned param_no, char* data, long* len)
{
    if (!len)
        return SCANNER_ERR_INVALID_PARAMETER;

    int l = *len,
        err = SCAN_PTR(h)->get_setting(param_no, data, &l);

    *len = l;

    return (scanner_err)err;
}
scanner_err hg_scanner_mgr::hg_scanner_set_parameter(scanner_handle h, unsigned param_no, void* data, long len)
{
    return (scanner_err)SCAN_PTR(h)->set_setting(param_no, data, len);
}
scanner_err hg_scanner_mgr::hg_scanner_start(scanner_handle h, void* async_event, int num)
{
	return (scanner_err)SCAN_PTR(h)->start();
}
scanner_err hg_scanner_mgr::hg_scanner_stop(scanner_handle h)
{
	return (scanner_err)SCAN_PTR(h)->stop();
}
scanner_err hg_scanner_mgr::hg_scanner_get_img_info(scanner_handle h, SANE_Parameters* bmi, long len)
{
	return (scanner_err)SCAN_PTR(h)->get_image_info(bmi);
}
scanner_err hg_scanner_mgr::hg_scanner_read_img_data(scanner_handle h, unsigned char* data, long* len)
{
    if (!len)
        return SCANNER_ERR_INVALID_PARAMETER;

    int l = *len,
        err = SCAN_PTR(h)->read_image_data(data, &l);

    *len = l;

    return (scanner_err)err;
}
scanner_err hg_scanner_mgr::hg_scanner_get_status(scanner_handle h, int setstutas)
{
    return (scanner_err)SCAN_PTR(h)->status();
}
scanner_err hg_scanner_mgr::hg_scanner_reset(scanner_handle h)
{
    return (scanner_err)SCAN_PTR(h)->reset();
}
scanner_err hg_scanner_mgr::hg_scanner_control(scanner_handle h, unsigned long code, void* data, unsigned* len)
{
    //if (!len && code != IO_CTRL_CODE_TEST_SINGLE)
    //    return SCANNER_ERR_INVALID_PARAMETER;

    if (code == IO_CTRL_CODE_ABOUT_INFO)
        return get_about_info(h, data, len);
    else if (!h)
        return SCANNER_ERR_INVALID_PARAMETER;
    else
        return (scanner_err)SCAN_PTR(h)->device_io_control(code, data, len);
}