#include "image_io/jpeg/jpeg_marker.h"
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#include <iomanip>
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#include <limits>
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#include <sstream>
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#include <string>
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#include <vector>
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namespace photos_editing_formats {
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namespace image_io {
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using std::string;
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using std::stringstream;
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using std::vector;
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// Storage for class (static) data members.
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const size_t JpegMarker::kLength; // = 2;
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const size_t JpegMarker::kTypeOffset; // = 1;
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const Byte JpegMarker::kZERO; // = 0x00;
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const Byte JpegMarker::kStart; // = 0xFF;
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const Byte JpegMarker::kSOS; // = 0xDA;
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const Byte JpegMarker::kSOI; // = 0xD8;
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const Byte JpegMarker::kEOI; // = 0xD9;
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const Byte JpegMarker::kAPP0; // = 0xE0;
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const Byte JpegMarker::kAPP1; // = 0xE1;
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const Byte JpegMarker::kAPP2; // = 0xE2;
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const Byte JpegMarker::kFILL; // = 0xFF;
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const std::string JpegMarker::GetName() const {
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switch (type_) {
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case 0x01:
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return "TEM";
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case 0xC4:
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return "DHT";
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case 0xC8:
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return "JPG";
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case 0xCC:
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return "DAC";
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case JpegMarker::kSOI:
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return"SOI";
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case JpegMarker::kEOI:
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return "EOI";
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case JpegMarker::kSOS:
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return "SOS";
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case 0xDB:
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return "DQT";
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case 0xDC:
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return "DNL";
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case 0xDD:
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return "DRI";
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case 0xDE:
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return "DHP";
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case 0xDF:
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return "EXP";
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case 0xFE:
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return "COM";
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}
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stringstream name_stream;
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if (0xC0 <= type_ && type_ <= 0xC0+15) {
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name_stream << "SOF" << type_-0xC0;
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return name_stream.str();
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}
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if (0xD0 <= type_ && type_ <= 0xD0+7) {
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name_stream << "RST" << type_-0xD0;
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return name_stream.str();
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}
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if (JpegMarker::kAPP0 <= type_ && type_ <= JpegMarker::kAPP0+15) {
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name_stream << "APP" << type_-JpegMarker::kAPP0;
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return name_stream.str();
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}
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if (0xF0 <= type_ && type_ <= 0xF0+13) {
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name_stream << "JPG" << type_-0xF0;
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return name_stream.str();
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}
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return GetHexString("0x");
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}
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const std::string JpegMarker::GetHexString(const std::string& prefix) const {
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stringstream name_stream;
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name_stream << prefix << std::hex << std::uppercase << std::setfill('0')
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<< std::setw(2) << static_cast<int>(type_);
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return name_stream.str();
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}
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bool JpegMarker::HasVariablePayloadSize() const {
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return type_ != 0x00 && type_ != 0x01 && (type_ < 0xD0 || type_ > 0xD7) &&
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type_ != JpegMarker::kSOI && type_ != JpegMarker::kEOI &&
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type_ != 0xFF;
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}
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bool JpegMarker::IsEntropySegmentDelimiter() const {
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return (type_ == kSOS || (type_ >= 0xD0 && type_ <= 0xD7));
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}
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} // namespace image_io
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} // namespace photos_editing_formats
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