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data_util.cpp
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192 lines (175 loc) · 5.55 KB
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#include "editor.h"
// Read the data stored in 'FileDescriptorNew* pDescriptorNew', starting at 'start_bit' of 'current_byte'
// and continuing for 'bits_to_write'. If end of current byte is reached, advance 'current_byte' to next
// byte.
int read_data(int start_bit, int bits_to_read, int& current_byte, FileDescriptorNew* pDescriptorNew)
{
int shift;
int pow_of_two[] = {1,2,4,8,16,32,64,128};
int bytes_advanced = 0;
int output = 0;
int bit = start_bit;
for(int ii=0; ii<bits_to_read; ii++)
{
if(bit == 8)
{
bit = 0;
current_byte++;
}
if(ii%8 == 0 && ii>0) bytes_advanced++;
shift = bit-(ii%8);
if(shift>=0)
output += ((pDescriptorNew->data[current_byte] >> shift) & pow_of_two[ii % 8]) << bytes_advanced*8;
else
output += ((pDescriptorNew->data[current_byte] << -shift) & pow_of_two[ii % 8]) << bytes_advanced*8;
bit++;
}
if(bit == 8) current_byte++;
return output;
}
// Write the data stored in 'input' to 'FileDescriptorNew* pDescriptorNew', starting at 'start_bit' of 'current_byte'
// and continuing for 'bits_to_write'. If end of current byte is reached, advance 'current_byte' to next byte.
void write_data(int input, int start_bit, int bits_to_write, int& current_byte, FileDescriptorNew* pDescriptorNew)
{
int shift;
uint8_t pow_of_two[] = {1,2,4,8,16,32,64,128};
int bytes_advanced = 0;
int bit = start_bit;
uint8_t byte_val = pDescriptorNew->data[current_byte];
for(int ii=0; ii<bits_to_write; ii++)
{
if(bit == 8)
{
bit = 0;
pDescriptorNew->data[current_byte] = byte_val;
current_byte++;
byte_val = pDescriptorNew->data[current_byte];
}
if(ii%8 == 0 && ii>0) bytes_advanced++;
shift = (ii%8) - bit;
if(shift>=0)
byte_val = (byte_val & ~pow_of_two[bit]) + (((input >> bytes_advanced*8) >> shift) & pow_of_two[bit]);
else
byte_val = (byte_val & ~pow_of_two[bit]) + (((input >> bytes_advanced*8) << -shift) & pow_of_two[bit]);
bit++;
}
pDescriptorNew->data[current_byte] = byte_val;
if(bit == 8)
{
current_byte++;
}
}
int read_dataOld(int start_bit, int bits_to_read, int& current_byte, FileDescriptorOld* pDescriptor)
{
int shift;
int pow_of_two[] = { 1,2,4,8,16,32,64,128 };
int bytes_advanced = 0;
int output = 0;
int bit = start_bit;
for (int ii = 0; ii < bits_to_read; ii++)
{
if (bit == 8)
{
bit = 0;
current_byte++;
}
if (ii % 8 == 0 && ii > 0) bytes_advanced++;
shift = bit - (ii % 8);
if (shift >= 0)
output += ((pDescriptor->data[current_byte] >> shift) & pow_of_two[ii % 8]) << bytes_advanced * 8;
else
output += ((pDescriptor->data[current_byte] << -shift) & pow_of_two[ii % 8]) << bytes_advanced * 8;
bit++;
}
if (bit == 8) current_byte++;
return output;
}
// Write the data stored in 'input' to 'FileDescriptorOld* pDescriptor', starting at 'start_bit' of 'current_byte'
// and continuing for 'bits_to_write'
void write_dataOld(int input, int start_bit, int bits_to_write, int& current_byte, FileDescriptorOld* pDescriptor)
{
int shift;
uint8_t pow_of_two[] = { 1,2,4,8,16,32,64,128 };
int bytes_advanced = 0;
int bit = start_bit;
uint8_t byte_val = pDescriptor->data[current_byte];
for (int ii = 0; ii < bits_to_write; ii++)
{
if (bit == 8)
{
bit = 0;
pDescriptor->data[current_byte] = byte_val;
current_byte++;
byte_val = pDescriptor->data[current_byte];
}
if (ii % 8 == 0 && ii > 0) bytes_advanced++;
shift = (ii % 8) - bit;
if (shift >= 0)
byte_val = (byte_val & ~pow_of_two[bit]) + (((input >> bytes_advanced * 8) >> shift) & pow_of_two[bit]);
else
byte_val = (byte_val & ~pow_of_two[bit]) + (((input >> bytes_advanced * 8) << -shift) & pow_of_two[bit]);
bit++;
}
pDescriptor->data[current_byte] = byte_val;
if (bit == 8)
{
current_byte++;
}
}
int read_data15(int start_bit, int bits_to_read, int& current_byte, FileDescriptor15* pDescriptor)
{
int shift;
int pow_of_two[] = { 1,2,4,8,16,32,64,128 };
int bytes_advanced = 0;
int output = 0;
int bit = start_bit;
for (int ii = 0; ii < bits_to_read; ii++)
{
if (bit == 8)
{
bit = 0;
current_byte++;
}
if (ii % 8 == 0 && ii > 0) bytes_advanced++;
shift = bit - (ii % 8);
if (shift >= 0)
output += ((pDescriptor->data[current_byte] >> shift) & pow_of_two[ii % 8]) << bytes_advanced * 8;
else
output += ((pDescriptor->data[current_byte] << -shift) & pow_of_two[ii % 8]) << bytes_advanced * 8;
bit++;
}
if (bit == 8) current_byte++;
return output;
}
// Write the data stored in 'input' to 'FileDescriptor15* pDescriptor', starting at 'start_bit' of 'current_byte'
// and continuing for 'bits_to_write'
void write_data15(int input, int start_bit, int bits_to_write, int& current_byte, FileDescriptor15* pDescriptor)
{
int shift;
uint8_t pow_of_two[] = { 1,2,4,8,16,32,64,128 };
int bytes_advanced = 0;
int bit = start_bit;
uint8_t byte_val = pDescriptor->data[current_byte];
for (int ii = 0; ii < bits_to_write; ii++)
{
if (bit == 8)
{
bit = 0;
pDescriptor->data[current_byte] = byte_val;
current_byte++;
byte_val = pDescriptor->data[current_byte];
}
if (ii % 8 == 0 && ii > 0) bytes_advanced++;
shift = (ii % 8) - bit;
if (shift >= 0)
byte_val = (byte_val & ~pow_of_two[bit]) + (((input >> bytes_advanced * 8) >> shift) & pow_of_two[bit]);
else
byte_val = (byte_val & ~pow_of_two[bit]) + (((input >> bytes_advanced * 8) << -shift) & pow_of_two[bit]);
bit++;
}
pDescriptor->data[current_byte] = byte_val;
if (bit == 8)
{
current_byte++;
}
}