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<?php
namespace RangeHeader;
class RangeHeader
{
private $first_byte;
private $last_byte;
private $filesize;
private $is_valid = true;
public function __construct($http_range_header, $file_path)
{
// Simulate basic support for the Content-Range header.
preg_match('/bytes=(\d+)?-(\d+)?/', $http_range_header, $matches);
$this->first_byte = isset($matches['1']) ? (int)$matches['1'] : null;
$this->last_byte = isset($matches['2']) ? (int)$matches['2'] : null;
$this->filesize = filesize($file_path);
// Start position begins after end of file.
if ($this->first_byte >= $this->filesize) {
$this->is_valid = false;
}
// "If the last-byte-pos value is present, it MUST be greater than or equal to the first-byte-pos in that
// byte-range-spec, or the byte- range-spec is syntactically invalid."
if (!($this->last_byte === null) && !($this->last_byte >= $this->first_byte)) {
$this->is_valid = false;
}
}
public function getFirstBytePosition()
{
if ($this->first_byte === null) {
return $this->filesize - 1 - $this->last_byte;
}
return $this->first_byte;
}
public function getLastBytePosition()
{
if ($this->last_byte === null) {
return $this->filesize - 1;
}
return $this->last_byte;
}
public function getLength()
{
return $this->getLastBytePosition() - $this->getFirstBytePosition() + 1;
}
public function getByteRangeSpec()
{
return $this->is_valid ? $this->getFirstBytePosition() . '-' . $this->getLastBytePosition() : '*';
}
public function getContentRangeHeader()
{
return 'bytes ' . $this->getByteRangeSpec() . '/' . $this->filesize;
}
public function isValid()
{
return $this->is_valid;
}
}