function time_end($start)
{
$end = time_micro();
$end = round($end - $start, 3);
$end = pad_zeros($end, 3);
return $end;
}
function Expand()
{
if (!$this->havefiles) {
$this->Error("Files not provided");
}
if ($this->debug_time) {
$this->debug_t1 = time_micro();
}
//
// WORKING WITH INPUT
//
// From header : reading Huffman tree (with no weights, mind you)
$this->ReconstructTree();
// From header : number of characters to read (ie. size of output file)
$this->ofsize = bindec($this->BitRead(24));
//
// WORKING WITH OUTPUT
//
// Reading bit-by-bit and generating output
$this->Read2MakeOutput();
// Writing the output and closing resource handles
fwrite($this->ofhand, $this->odata);
fclose($this->ofhand);
fclose($this->ifhand);
if ($this->debug_time) {
$this->debug_t2 = time_micro();
}
// Calling Debug stuff in case any has been activated
$this->ShowDebug();
}
function Compress()
{
if (!$this->havefiles) {
$this->Error("Files not provided");
}
if ($this->debug_time) {
$this->debug_t1 = time_micro();
}
//
// WORKING WITH INPUT
//
// Counting letter occurrences in input file
$this->CountOccurrences();
// Converting occurrences into basic nodes
// The nodes array has been initialized, as it will be filled with dynamic incrementation
$this->Occs2Nodes();
// Construction of the Huffman tree
$this->MakeHuffmanTree();
// Constructing character codes
$this->MakeCharCodes();
//
// WORKING WITH OUTPUT
//
//!! No need for 8 bits of nb of chars in alphabet ?? still use $this -> nbchars ? NO
//!! No need for 8+5+codelen bits of chars & codes ?? still use $this -> codelens array ? YES
// Header : passing the Huffman tree with an automatically stopping algorithm
$this->TransmitTree();
// End of header : number of chars actually encoded, over 3 bytes
$this->BitWrite(DecBinDig($this->ifsize, 24), 24);
// Contents : compressed data
rewind($this->ifhand);
while (($char = fgetc($this->ifhand)) !== FALSE) {
$this->BitWrite($this->codes[$char], $this->codelens[$char]);
}
// Finalising output, closing file handles
$this->BitWrite_End();
fclose($this->ofhand);
fclose($this->ifhand);
if ($this->debug_time) {
$this->debug_t2 = time_micro();
}
// Calling Debug stuff in case any has been activated
$this->ShowDebug();
}