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mot_manager.cpp
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/*
DABlin - capital DAB experience
Copyright (C) 2016-2018 Stefan Pöschel
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 3 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/>.
*/
#include "mot_manager.h"
// --- MOTEntity -----------------------------------------------------------------
void MOTEntity::AddSeg(int seg_number, bool last_seg, const uint8_t* data, size_t len) {
//qDebug()<<"MOTEntity::AddSeg start";
if(last_seg)
last_seg_number = seg_number;
if(segs.find(seg_number) != segs.end())
return;
// copy data
segs[seg_number] = seg_t(len);
//qDebug()<<"memcpy addseg Entity"<<memcpy(&segs[seg_number][0], data, len);
memcpy(&segs[seg_number][0], data, len);
size += len;
}
bool MOTEntity::IsFinished() {
//qDebug()<<"MOTEntity::IsFinished start";
//qDebug()<<"last_seg_number"<<last_seg_number;
if(last_seg_number == -1)
return false;
// check if all segments are available
for(int i = 0; i <= last_seg_number; i++)
//qDebug()<<"segs.find(i)"<<segs;
if(segs.find(i) == segs.end())
return false;
//qDebug()<<"return true MOTEntity::IsFinished() for reached";
return true;
}
std::vector<uint8_t> MOTEntity::GetData() {
//qDebug()<<"MOTEntity::GetData start";
std::vector<uint8_t> result(size);
size_t offset = 0;
// concatenate all segments
for(int i = 0; i <= last_seg_number; i++) {
seg_t& seg = segs[i];
memcpy(&result[offset], &seg[0], seg.size());
offset += seg.size();
}
//qDebug()<<"result"<<result;
return result;
}
// --- MOTObject -----------------------------------------------------------------
void MOTObject::AddSeg(bool dg_type_header, int seg_number, bool last_seg, const uint8_t* data, size_t len) {
//qDebug()<<"MOTObject::AddSeg start";
(dg_type_header ? header : body).AddSeg(seg_number, last_seg, data, len);
}
bool MOTObject::ParseCheckHeader(MOT_FILE& target_file) {
//qDebug()<<"MOTObject::ParseCheckHeader start";
MOT_FILE file = target_file;
std::vector<uint8_t> data = header.GetData(); //qDebug()<<"data in MOTObject ParseCheckHeader"<<data;
// parse/check header core
if(data.size() < 7)
return false;
size_t body_size = (data[0] << 20) | (data[1] << 12) | (data[2] << 4) | (data[3] >> 4); //qDebug()<<"body_size"<<body_size;
size_t header_size = ((data[3] & 0x0F) << 9) | (data[4] << 1) | (data[5] >> 7); //qDebug()<<"header_size"<<header_size;
int content_type = (data[5] & 0x7F) >> 1; //qDebug()<<"content_type"<<content_type;
int content_sub_type = ((data[5] & 0x01) << 8) | data[6]; //qDebug()<<"conten_sub_type"<<content_sub_type;
//type 2 == image, 5 == transport
//subtype == 0 ? "GIF" : subtype == 1 ? "JPEG" : subtype == 2 ? "BMP" : "PNG"
// fprintf(stderr, "body_size: %5zu, header_size: %3zu, content_type: 0x%02X, content_sub_type: 0x%03X\n",
// body_size, header_size, content_type, content_sub_type);
if(header_size != header.GetSize())
return false;
//qDebug()<<"header_size != header.GetSize() passed";
bool header_update =
content_type == MOT_FILE::CONTENT_TYPE_MOT_TRANSPORT &&
content_sub_type == MOT_FILE::CONTENT_SUB_TYPE_HEADER_UPDATE;
//qDebug()<<"content_type"<<content_type;
//qDebug()<<"content_sub_type"<<content_sub_type;
// abort, if neither none nor both conditions (header received/update) apply
if(header_received != header_update)
return false;
//qDebug()<<"header_received != header_update passed";
if(!header_update) {
// store core info
file.body_size = body_size; //qDebug()<<"file.body_size"<<file.body_size;
file.content_type = content_type; //qDebug()<<"file.conten_type"<<file.content_type;
file.content_sub_type = content_sub_type; //qDebug()<<"file.content_sub_type"<<file.content_sub_type;
}
std::string old_content_name = file.content_name;
std::string new_content_name;
// parse/check header extension
for(size_t offset = 7; offset < data.size();) {
int pli = data[offset] >> 6; //qDebug()<<"pli"<<pli;
int param_id = data[offset] & 0x3F; //qDebug()<<"param_id"<<param_id;
offset++;
// get parameter len
size_t data_len;
switch(pli) {
case 0b00:
data_len = 0;
break;
case 0b01:
data_len = 1;
break;
case 0b10:
data_len = 4;
break;
case 0b11:
if(offset >= data.size())
return false;
bool ext = data[offset] & 0x80;
data_len = data[offset] & 0x7F;
offset++;
if(ext) {
if(offset >= data.size())
return false;
data_len = (data_len << 8) + data[offset];
offset++;
}
break;
}
if(offset + data_len - 1 >= data.size())
return false;
// process parameter
switch(param_id) {
case 0x05: // TriggerTime
if(data_len < 4)
return false;
// TODO: not only distinguish between Now or not
file.trigger_time_now = !(data[offset] & 0x80);
//fprintf(stderr, "TriggerTime: %s\n", file.trigger_time_now ? "Now" : "(not Now)");
break;
case 0x0C: // ContentName
if(data_len == 0)
return false;
//file.content_name = CharsetTools::ConvertTextToUTF8(&data[offset + 1], data_len - 1, data[offset] >> 4, true, &file.content_name_charset);
file.content_name = toUtf8StringUsingCharset ( (const char *)&data[offset + 1], (CharacterSet) (data[offset] >> 4), data_len - 1);
new_content_name = file.content_name;
//fprintf(stderr, "ContentName: '%s'\n", file.content_name.c_str());
break;
case 0x26: // CategoryTitle
file.category_title = std::string((char*) &data[offset], data_len); // already UTF-8
//fprintf(stderr, "CategoryTitle: '%s'\n", file.category_title.c_str());
break;
case 0x27: // ClickThroughURL
file.click_through_url = std::string((char*) &data[offset], data_len); // already UTF-8
//fprintf(stderr, "ClickThroughURL: '%s'\n", file.click_through_url.c_str());
break;
}
offset += data_len;
}
if(!header_update) {
// ensure actual header is processed only once
header_received = true;
} else {
// ensure matching content name
if(new_content_name != old_content_name)
return false;
}
target_file = file;
//qDebug()<<"all done and passed";
return true;
}
bool MOTObject::IsToBeShown() {
//qDebug()<<"MOTObject::IsToBeShown start";
// abort, if already shown
if(shown)
return false;
// try to process finished header
if(header.IsFinished()) { //qDebug()<<"MOTObject::IsToBeShown() IsFinished check Header start";
// parse/check MOT header
bool result = ParseCheckHeader(result_file);
header.Reset(); // allow for header updates
if(!result)
return false;
} //qDebug()<<"MOTObject::IsToBeShown() IsFinished check Header passed";
// abort, if incomplete/not yet triggered
if(!header_received)
return false;
//qDebug()<<"MOTObject::IsToBeShown() IsFinished check Body start";
if(!body.IsFinished() || result_file.body_size != body.GetSize())
return false;
if(!result_file.trigger_time_now)
return false;
// add body data
result_file.data = body.GetData();
shown = true;
//qDebug()<<"MOTObject::IsToBeShown() all passed and ready for pic";
return true;
}
// --- MOTManager -----------------------------------------------------------------
MOTManager::MOTManager() {
//qDebug()<<"MOTManager::MOTManager start";
Reset();
}
void MOTManager::Reset() {
//qDebug()<<"MOTManager::Reset start";
object = MOTObject();
current_transport_id = -1;
}
bool MOTManager::ParseCheckDataGroupHeader(const std::vector<uint8_t>& dg, size_t& offset, int& dg_type) {
//qDebug()<<"MOTManager::ParseCheckDataGroupHeader start";
//qDebug()<<dg;
//qDebug()<<"offset"<<offset;
//qDebug()<<"dg.size"<<dg.size();
//qDebug()<<"offset+2"<<(offset + 2);
// parse/check Data Group header
if(dg.size() < (offset + 2))
return false;
bool extension_flag = dg[offset] & 0x80; //qDebug()<<extension_flag << "dg[offset]" << dg[offset];
bool crc_flag = dg[offset] & 0x40; //qDebug()<<crc_flag << "dg[offset]" << dg[offset];
bool segment_flag = dg[offset] & 0x20; //qDebug()<<segment_flag << "dg[offset]" << dg[offset];
bool user_access_flag = dg[offset] & 0x10; //qDebug()<<user_access_flag << "dg[offset]" << dg[offset];
dg_type = dg[offset] & 0x0F; //qDebug()<<"dg_type = dg[offset] & 0x0F"<<dg_type<< "dg[offset]" << dg[offset];
offset += 2 + (extension_flag ? 2 : 0); //qDebug()<<"offset"<<offset;
if(!crc_flag)
return false; //printf("1");//qDebug()<<"crc_flag";
if(!segment_flag)
return false; //printf("2");//qDebug()<<"segment_flag";
if(!user_access_flag)
return false; //printf("3");//qDebug()<<"user_acc";
if(dg_type != 3 && dg_type != 4) // only accept MOT header/body
return false; //printf("4");//qDebug()<<"4te stufe";
return true;
}
bool MOTManager::ParseCheckSessionHeader(const std::vector<uint8_t>& dg, size_t& offset, bool& last_seg, int& seg_number, int& transport_id) {
//qDebug()<<"MOTManager::ParseCheckSessionHeader start";
//qDebug()<<"offset overload"<<offset;
//qDebug()<<"dg"<<dg;
// parse/check session header
if(dg.size() < (offset + 3))
return false;
last_seg = dg[offset] & 0x80; //qDebug()<<"last_seg"<<last_seg;
seg_number = ((dg[offset] & 0x7F) << 8) | dg[offset + 1]; //qDebug()<<"seg_number"<<seg_number; //qDebug()<<"seg_number"<<(seg_number > 0 ? (seg_number / 4096) : 0);
//seg_number = (seg_number > 0 ? (seg_number / 4096) : 0);
bool transport_id_flag = dg[offset + 2] & 0x10; //qDebug()<<"transport_id_flag"<<transport_id_flag;
size_t len_indicator = dg[offset + 2] & 0x0F; //qDebug()<<"len_indicator"<<len_indicator;
offset += 3; //qDebug()<<"offset"<<offset;
if(!transport_id_flag)
return false;
if(len_indicator < 2)
return false;
// handle transport ID
if(dg.size() < (offset + len_indicator))
return false;
transport_id = (dg[offset] << 8) | dg[offset + 1]; //qDebug()<<"transport_id"<<transport_id;
offset += len_indicator;
return true;
}
bool MOTManager::ParseCheckSegmentationHeader(const std::vector<uint8_t>& dg, size_t& offset, size_t& seg_size) {
//qDebug()<<"MOTManager::ParseCheckSegmentationHeader start";
//qDebug()<<"offset overload2"<<offset;
// parse/check segmentation header (MOT)
if(dg.size() < (offset + 2))
return false;
seg_size = ((dg[offset] & 0x1F) << 8) | dg[offset + 1]; //qDebug()<<"seg_size"<<seg_size;
offset += 2;
//qDebug()<<"offset"<<offset;
//qDebug()<<"calccrc"<<(seg_size != dg.size() - offset - CalcCRC::CRCLen + 1);
//qDebug()<<"dg.size()"<<dg.size();
//qDebug()<<"offset crc"<<offset;
//qDebug()<<"CRCLen"<<CalcCRC::CRCLen;
// compare announced/actual segment size
if(seg_size != dg.size() - offset - CalcCRC::CRCLen) //qDebug()<<"calccrc"<<(seg_size != dg.size() - offset - CalcCRC::CRCLen);
return false;
return true;
}
bool MOTManager::HandleMOTDataGroup(const std::vector<uint8_t>& dg) {
//qDebug()<<"MOTManager::HandleMOTDataGroup start";
size_t offset = 0;
// parse/check headers
int dg_type;
bool last_seg;
int seg_number;
int transport_id;
size_t seg_size;
// qDebug()<<"dg_type"<<dg_type;
// qDebug()<<"last_seg"<<last_seg;
// qDebug()<<"seg_number"<<seg_number;
// qDebug()<<"transport_id"<<transport_id;
// qDebug()<<"seg_size"<<seg_size;
if(!ParseCheckDataGroupHeader(dg, offset, dg_type)) //qDebug()<<"PCDGH"<<ParseCheckDataGroupHeader(dg, offset, dg_type);
return false;
if(!ParseCheckSessionHeader(dg, offset, last_seg, seg_number, transport_id))
return false;
if(!ParseCheckSegmentationHeader(dg, offset, seg_size))
return false;
//qDebug()<<"start after checks---------------------------------------------";
// add segment to MOT object (reset if necessary)
if(current_transport_id != transport_id) {
current_transport_id = transport_id;
object = MOTObject();
}
//qDebug()<<"seg_number"<<seg_number;
//qDebug()<<"last_seg"<<last_seg;
//qDebug()<<"dg[offset]"<<dg[offset];
//qDebug()<<"seg_size"<<seg_size;
object.AddSeg(dg_type == 3, seg_number, last_seg, &dg[offset], seg_size);
// check if object shall be shown
bool display = object.IsToBeShown();
// fprintf(stderr, "dg_type: %d, seg_number: %2d%s, transport_id: %5d, size: %4zu; display: %s\n",
// dg_type, seg_number, last_seg ? " (LAST)" : "", transport_id, seg_size, display ? "true" : "false");
// if object shall be shown, update it
return display;
}