71 lines
1.3 KiB
C++
71 lines
1.3 KiB
C++
#include "bitbuffer.h"
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#include <memory.h>
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#include <stdlib.h>
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BitBuffer::BitBuffer()
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{
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buffer=0;
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length=0;
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bits=0;
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}
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void BitBuffer::WriteBit(char bit)
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{
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if (bits == 0)
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Resize(length+1);
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bit = !!bit;
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unsigned char mask = 1 << (7-bits);
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buffer[length-1] &= ~mask;
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buffer[length-1] |= (bit << (7-bits));
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bits=(bits+1)%8;
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}
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void BitBuffer::Resize(size_t newlen)
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{
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if (newlen > length)
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{
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unsigned char *new_buffer = (unsigned char *)realloc(buffer, newlen);
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if (new_buffer)
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{
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buffer = new_buffer;
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memset(buffer+length, 0, newlen-length); // zero out new data
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length=newlen;
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}
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else
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{
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new_buffer = (unsigned char *)malloc(newlen);
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if (new_buffer)
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{
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memcpy(new_buffer, buffer, length);
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free(buffer);
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buffer = new_buffer;
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memset(buffer+length, 0, newlen-length); // zero out new data
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length=newlen;
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}
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}
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}
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}
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void BitBuffer::WriteBits(uintptr_t num, size_t bitlen)
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{
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for (size_t i=0;i!=bitlen;i++)
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{
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WriteBit((num >> (bitlen-i-1))&1);
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}
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}
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void BitBuffer::WriteBytes(void *buffer, size_t bytes)
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{
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unsigned char *b = (unsigned char *)buffer;
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for (size_t i=0;i!=bytes;i++)
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WriteBits(b[i], 8);
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}
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void BitBuffer::WriteByte(unsigned char byte)
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{
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for (size_t i=0;i!=8;i++)
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{
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WriteBit((byte >> (7-i))&1);
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}
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} |