/**
* Retrieve the list of the data sections contained in this CHM.
*
* @throws Exception Throws an Exception in case of errors.
*/
protected function retrieveSectionList()
{
$nameList = $this->getEntryByPath('::DataSpace/NameList');
if ($nameList === null) {
throw new Exception("Missing required entry: '::DataSpace/NameList'");
}
if ($nameList->getContentSectionIndex() !== 0) {
throw new Exception("The content of the entry '{$nameList->getPath()}' should be in section 0, but it's in section {$nameList->getContentSection()}");
}
$nameListReader = new StringReader($nameList->getContents());
/* Length */
$nameListReader->readUInt16();
$numSections = $nameListReader->readUInt16();
if ($numSections === 0) {
throw new Exception('No content section defined.');
}
for ($i = 0; $i < $numSections; ++$i) {
$nameLength = $nameListReader->readUInt16();
$utf16name = $nameListReader->readString($nameLength * 2);
$nameListReader->readUInt16();
$name = iconv('UTF-16LE', 'UTF-8', $utf16name);
switch ($name) {
case 'Uncompressed':
break;
case 'MSCompressed':
if ($i === 0) {
throw new Exception('First data section should be Uncompressed');
} else {
$this->sections[$i] = new Section\MSCompressedSection($this);
}
break;
default:
throw new Exception("Unknown data section: {$name}");
}
}
}
