uint32 calculate_crc_for_opened_file(OpenedFile& OFile)
{
uint32 crc = 0;
unsigned char *buffer;
/* Build the crc table */
if(build_crc_table())
{
buffer = new byte[BUFFER_SIZE];
if(buffer)
{
crc= calculate_file_crc(buffer, BUFFER_SIZE, OFile);
delete []buffer;
}
/* free the crc table! */
free_crc_table();
}
return crc;
}
/* Calculate the crc for a file using the given buffer.. */
unsigned long calculate_data_crc(
unsigned char *buffer,
long length)
{
unsigned long crc= 0l;
assert(buffer);
/* Build the crc table */
if(build_crc_table())
{
/* The odd permutions ensure that we get the same crc as for a file */
crc = 0xFFFFFFFFL;
crc = calculate_buffer_crc(length, crc, buffer);
crc ^= 0xFFFFFFFFL;
/* free the crc table! */
free_crc_table();
}
return crc;
}
unsigned long calculate_crc_for_opened_file(
short refnum)
{
unsigned long crc;
unsigned char *buffer;
/* Build the crc table */
if(build_crc_table())
{
buffer= (unsigned char *) malloc(BUFFER_SIZE*sizeof(unsigned char));
if(buffer)
{
crc= calculate_file_crc(buffer, BUFFER_SIZE, refnum);
free(buffer);
}
/* free the crc table! */
free_crc_table();
}
return crc;
}
