code_app/app/scanner/sane_device.cpp

#include "sane_device.h"


sane_dev::sane_dev() : hdev_(nullptr), offline_(true), name_(""), cfg_name_("")
{}
sane_dev::~sane_dev()
{
    close();
}

bool sane_dev::apply(OPTSCHEME* schm)
{
    SANE_Int    count = 0,
                afterdo = 0;
    bool        ret = false;

    if(sane_control_option(hdev_, 0, SANE_ACTION_GET_VALUE, &count, &afterdo) == SANE_STATUS_GOOD)
    {
        int applied = 0;
        for(int i = 1; i < count; ++i)
        {
            const SANE_Option_Descriptor* desc = sane_get_option_descriptor(hdev_, i);

            if(!desc)
                continue;
            if(desc->type == SANE_TYPE_GROUP ||
               desc->type == SANE_TYPE_BUTTON)
                continue;

            act_result result = apply(desc, i, schm->opts);
            if(result == ACT_RESULT_NO_NEED)
                continue;

            if(result == ACT_RESULT_SUCCESS)
                applied++;
            else
                break;
        }
        ret = schm->opts.size() == applied;
    }

    if(ret)
        cfg_name_ = schm->m_schemeTitle;

    return ret;
}
sane_dev::act_result sane_dev::apply(const SANE_Option_Descriptor* desc, int opt, const std::vector<OPTVAL>& vals)
{
    act_result      result = ACT_RESULT_NO_NEED;
    const OPTVAL    *cfg = nullptr;

    for(size_t i = 0; i < vals.size(); ++i)
    {
        if(vals[i].name == desc->name)
        {
            cfg = &vals[i];
            break;
        }
    }
    if(cfg)
    {
        SANE_Int    afterdo = 0;
        void        *data = nullptr, *str = nullptr;
        SANE_Int    nv = 0;
        SANE_Bool   bv = false;
        SANE_Fixed  fv = 0;

        result = ACT_RESULT_FAILED;
        if(desc->type == SANE_TYPE_INT)
        {
            nv = atoi(cfg->val.c_str());
            data = &nv;
        }
        else if(desc->type == SANE_TYPE_BOOL)
        {
            bv = cfg->val == "true";
            data = &bv;
        }
        else if(desc->type == SANE_TYPE_FIXED)
        {
            fv = SANE_FIX(atof(cfg->val.c_str()));
            data = &fv;
        }
        else if(desc->type == SANE_TYPE_STRING)
        {
            int len = (int)cfg->val.length() > desc->size * 4 ? cfg->val.length() : desc->size * 4;

            str = new char[len + 4];
            if(str)
            {
                memset(str, 0, len + 4);
                strcpy((char*)str, cfg->val.c_str());
                data = str;
            }
        }

        if(data)
            result = sane_control_option(hdev_, opt, SANE_ACTION_SET_VALUE, data, &afterdo) == SANE_STATUS_GOOD ? ACT_RESULT_SUCCESS : result;
        if(str)
            delete[] str;

        if(cfg->name == SANE_STD_OPT_NAME_IS_CUSTOM_GAMMA && cfg->val == "true")
        {
            SANE_Gamma gamma = {0};
            unsigned int l = 0;
            if(config::load_custom_gamma(cfg->extra.c_str(), &gamma))
                sane_io_control(hdev_, IO_CTRL_CODE_SET_CUSTOM_GAMMA, &gamma, &l);
        }
    }

    return result;
}

std::string sane_dev::name(void)
{
    return name_;
}
std::string sane_dev::current_configuration_name(void)
{
    return cfg_name_;
}
bool sane_dev::is_online(void)
{
    return !offline_;
}
SANE_Handle sane_dev::handle(void)
{
    return hdev_;
}

bool sane_dev::open(const std::string& name)
{
    if(name_ == name)
        return true;

    close();

    SANE_Status statu = sane_open(name.c_str(), &hdev_);
    if(statu == SANE_STATUS_GOOD)
    {
        DEVCFG  first;

        name_ = name;
        offline_ = false;
        if(first.schemes.size())
            cfg_name_ = first.schemes[0].m_schemeTitle;
    }

    return statu == SANE_STATUS_GOOD;
}
bool sane_dev::apply_setting(OPTSCHEME* schm)
{
    bool ret = false;

    if(hdev_)
    {
        if(sane_io_control(hdev_, IO_CTRL_CODE_RESTORE_SETTINGS, nullptr, nullptr) == SANE_STATUS_GOOD)
        {
            DEVCFG  first;
            if(first.schemes.size())
                cfg_name_ = first.schemes[0].m_schemeTitle;
            if(schm)
            {
                ret = apply(schm);
            }
            else
            {
                ret = true;
            }
        }
    }

    return ret;
}
void sane_dev::set_online(bool online)
{
    offline_ = !online;
}
void sane_dev::close(void)
{
    if(hdev_)
    {
        sane_close(hdev_);
        hdev_ = nullptr;
    }
    offline_ = true;
    name_ = "";
    cfg_name_ = "";
}