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<?php |
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namespace Xls; |
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class Bitmap |
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{ |
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const HEADER_SIZE = 0x36; |
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/** |
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* @var string |
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*/ |
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protected $filePath; |
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/** Holds raw file data |
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* @var mixed |
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*/ |
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protected $data; |
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/** |
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* @var mixed |
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*/ |
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protected $header; |
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/** |
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* @param string $filePath |
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*/ |
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public function __construct($filePath) |
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{ |
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$this->filePath = $filePath; |
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$this->read(); |
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} |
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/** |
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* @return string |
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* @throws \Exception |
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*/ |
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protected function read() |
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{ |
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$this->data = @file_get_contents($this->filePath, FILE_BINARY); |
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if ($this->data === false) { |
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throw new \Exception("Couldn't import $this->filePath"); |
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} |
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$this->header = substr($this->data, 0, self::HEADER_SIZE); |
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$this->validate(); |
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} |
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/** |
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* @throws \Exception |
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*/ |
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protected function validate() |
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{ |
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if (strlen($this->data) <= self::HEADER_SIZE) { |
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throw new \Exception("$this->filePath doesn't contain enough data"); |
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} |
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if ($this->getIdent() != "BM") { |
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throw new \Exception("$this->filePath doesn't appear to be a valid bitmap image"); |
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} |
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if ($this->getColorDepth() != 24) { |
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throw new \Exception("$this->filePath isn't a 24bit true color bitmap"); |
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} |
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if ($this->getPlanesCount() != 1) { |
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throw new \Exception("$this->filePath: only 1 plane supported in bitmap image"); |
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} |
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if ($this->getCompression() != 0) { |
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throw new \Exception("$this->filePath: compression not supported in bitmap image"); |
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} |
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} |
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/** |
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* @return mixed |
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*/ |
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protected function getIdent() |
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{ |
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$identity = unpack("A2ident", $this->header); |
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return $identity['ident']; |
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} |
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/** |
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* @return mixed |
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*/ |
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public function getWidth() |
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{ |
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$result = unpack("Vwidth", substr($this->header, 18, 4)); |
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return $result['width']; |
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} |
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/** |
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* @return mixed |
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*/ |
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public function getHeight() |
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{ |
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$result = unpack("Vheight", substr($this->header, 22, 4)); |
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return $result['height']; |
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} |
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/** |
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* @return mixed |
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*/ |
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public function getPlanesCount() |
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{ |
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$result = unpack("v1", substr($this->header, 26, 2)); |
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return $result[1]; |
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} |
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/** |
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* @return mixed |
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*/ |
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public function getColorDepth() |
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{ |
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$result = unpack("v1", substr($this->header, 28, 2)); |
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return $result[1]; |
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} |
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125
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/** |
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* @return mixed |
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*/ |
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public function getCompression() |
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{ |
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$result = unpack("V1", substr($this->header, 30, 4)); |
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return $result[1]; |
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} |
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135
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/** |
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136
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* @return string |
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137
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*/ |
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138
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public function getDataWithoutHeader() |
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139
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{ |
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140
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return substr($this->data, self::HEADER_SIZE); |
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141
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} |
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142
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} |
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MAXakaWIZARD /
xls-writer
