Function imageParseJpeg

3rdparty/bimg/src/image_decode.cpp:703–837

	}

	static ImageContainer* imageParseJpeg(bx::AllocatorI* _allocator, const void* _data, uint32_t _size, bx::Error* _err)
	{
		bx::MemoryReader reader(_data, _size);

		bx::Error err;

		uint16_t magic = 0;
		bx::readHE(&reader, magic, false, &err);

		if (!err.isOk()
		||  0xffd8 != magic)
		{
			return NULL;
		}

		Orientation::Enum orientation = Orientation::R0;

		while (err.isOk() )
		{
			bx::readHE(&reader, magic, false, &err);

			uint16_t size;
			bx::readHE(&reader, size, false, &err);

			if (!err.isOk() )
			{
				return NULL;
			}

			if (0xffe1 != magic)
			{
				bx::seek(&reader, size-2);
				continue;
			}

			char exif00[6];
			bx::read(&reader, exif00, 6, &err);

			if (0 == bx::memCmp(exif00, "Exif\0\0", 6) )
			{
				uint16_t iimm = 0;
				bx::read(&reader, iimm, &err);

				const bool littleEndian = iimm == 0x4949; //II - Intel - little endian
				if (!err.isOk()
				&&  !littleEndian
				&&   iimm != 0x4d4d) // MM - Motorola - big endian
				{
					return NULL;
				}

				bx::readHE(&reader, magic, littleEndian, &err);
				if (!err.isOk()
				||  0x2a != magic)
				{
					return NULL;
				}