Function unpack_uastc

engine/dlib/src/basis/transcoder/basisu_transcoder.cpp:12182–12638

	}

	bool unpack_uastc(const uastc_block& blk, unpacked_uastc_block& unpacked, bool blue_contract_check, bool read_hints)
	{
		//memset(&unpacked, 0, sizeof(unpacked));
				
#if 0
		uint8_t table[128];
		memset(table, 0xFF, sizeof(table));

		{
			for (uint32_t mode = 0; mode <= TOTAL_UASTC_MODES; mode++)
			{
				const uint32_t code = g_uastc_mode_huff_codes[mode][0];
				const uint32_t codesize = g_uastc_mode_huff_codes[mode][1];

				table[code] = mode;

				uint32_t bits_left = 7 - codesize;
				for (uint32_t i = 0; i < (1 << bits_left); i++)
					table[code | (i << codesize)] = mode;
			}

			for (uint32_t i = 0; i < 128; i++)
				printf("%u,", table[i]);
			exit(0);
		}
#endif

		const int mode = g_uastc_huff_modes[blk.m_bytes[0] & 127];
		if (mode >= (int)TOTAL_UASTC_MODES)
			return false;

		unpacked.m_mode = mode;

		uint32_t bit_ofs = g_uastc_mode_huff_codes[mode][1];

		if (mode == UASTC_MODE_INDEX_SOLID_COLOR)
		{
			unpacked.m_solid_color.r = (uint8_t)read_bits1_to_9_fst(blk.m_bytes, bit_ofs, 8);
			unpacked.m_solid_color.g = (uint8_t)read_bits1_to_9_fst(blk.m_bytes, bit_ofs, 8);
			unpacked.m_solid_color.b = (uint8_t)read_bits1_to_9_fst(blk.m_bytes, bit_ofs, 8);
			unpacked.m_solid_color.a = (uint8_t)read_bits1_to_9_fst(blk.m_bytes, bit_ofs, 8);

			if (read_hints)
			{
				unpacked.m_etc1_flip = false;
				unpacked.m_etc1_diff = read_bit(blk.m_bytes, bit_ofs) != 0;
				unpacked.m_etc1_inten0 = (uint32_t)read_bits1_to_9_fst(blk.m_bytes, bit_ofs, 3);
				unpacked.m_etc1_inten1 = 0;
				unpacked.m_etc1_selector = (uint32_t)read_bits1_to_9_fst(blk.m_bytes, bit_ofs, 2);
				unpacked.m_etc1_r = (uint32_t)read_bits1_to_9_fst(blk.m_bytes, bit_ofs, 5);
				unpacked.m_etc1_g = (uint32_t)read_bits1_to_9_fst(blk.m_bytes, bit_ofs, 5);
				unpacked.m_etc1_b = (uint32_t)read_bits1_to_9_fst(blk.m_bytes, bit_ofs, 5);
				unpacked.m_etc1_bias = 0;
				unpacked.m_etc2_hints = 0;
			}

			return true;
		}