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Fixed issue when creating a shadow copy of a package, if the universe aligns together and the cosmos unit together to

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produce a package length exactly to where the end-of-package byte sequence is cut in half, the shadow copy will fail
   to be created due to the end-of-package byte sequence being cut in half, this issue was fixed by reading the package
   in chunks to determine the end-of-package byte sequence.

The PackageReader class has been updated to use a more efficient buffer management when reading data from a file. Previously, buffer size was growing uncontrollably and can eventually lead to out-of-memory errors for large files.

Now, the data is read in chunks and the buffer is cleared when it exceeds approximately 1MB size, maintaining only the last 512KB. This change ensures a more memory-efficient package reading and effectively prevents erroneous deadlocks for large package files.

Additionally, detection for end-of-data byte sequence has been modified to rectify an issue where package length could cut off the end-of-package byte sequence. This results in an improved reliability for package validation.
This commit is contained in:
Netkas 2023-10-25 21:40:42 -04:00
parent 76f12bb0a3
commit d2635b19fd
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GPG key ID: 5DAF58535614062B
2 changed files with 17 additions and 2 deletions
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15
src/ncc/Classes/PackageReader.php
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@ -182,17 +182,28 @@
// Seek the data until the end of the package (FF AA 55 F0)
fseek($this->package_file, $this->data_offset);
$buffer = '';
while(!feof($this->package_file))
{
$buffer = fread($this->package_file, 1024);
$this->data_length += strlen($buffer);
$current_chunk = fread($this->package_file, 1024);
$this->data_length += strlen($current_chunk);
$buffer .= $current_chunk;
// If we detect the end-of-data byte sequence
if (($position = strpos($buffer, "\xFF\xAA\x55\xF0")) !== false)
{
$this->data_length -= strlen($buffer) - $position;
$this->package_length += $this->data_length + 4;
break;
}
// Check if the buffer is 1MB or larger
if(strlen($buffer) > 1048576)
{
// Remove the first 512kb of the buffer
$buffer = substr($buffer, 512000);
}
}
if($this->data_length === null || $this->data_length === 0)