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void write_bits(someContainer<unsigned int>& dst,unsigned int& buffer,unsigned int& bits_left_in_buffer,int codeword,short bits_to_writE){ if(bits_to_write < bits_left_in_buffer){ buffer|= codeword << (32-bits_left_in_buffer); bits_left_in_buffer -= bits_to_write; }else{ unsigned int full_bits = bits_to_write - bits_left_in_buffer; unsigned int towrite = buffer|(codeword<<(32-bits_left_in_buffer)); buffer= full_bits ? (codeword >> bits_left_in_buffer) : 0; dst.push_BACk(towritE); bits_left_in_buffer = 32-full_bits; } }
有没有人知道任何好的优化,快速说明或其他可能有用的信息？
干杯,
@H_450_8@unsigned char* membuff; unsigned bit_pos; // current BIT position in the buffer,so it's max size is 512Mb // input bit buffer: we'll decode the byte address so that it's even,and the DWORD from that address will surely have at least 17 free bits inline unsigned int ge@R_262_11164@its(unsigned int bit_cnt){ // bit_cnt MUST be in range 0..17 unsigned int byte_offset = bit_pos >> 3; byte_offset &= ~1; // rounding down by 2. unsigned int bits = *(unsigned int*)(membuff + byte_offset); bits >>= bit_pos & 0xF; bit_pos += bit_cnt; return bits & BIT_MASKS[bit_cnt]; }; // output buffer,the whole desTination should be memset'ed to 0 inline unsigned int pu@R_262_11164@its(unsigned int val,unsigned int bit_cnt){ unsigned int byte_offset = bit_pos >> 3; byte_offset &= ~1; *(unsigned int*)(membuff + byte_offset) |= val << (bit_pos & 0xf); bit_pos += bit_cnt; };@H_450_8@ @H_450_8@
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