DEFAULT_VERSION
DEFAULT_VERSION = 0x1
Info-ZIP Unicode Comment Extra Field (0x6375):.
Stores the UTF-8 version of the file comment as stored in the central directory header. (Last Revision 20070912)
Value Size Description
(UCom) 0x6375 Short tag for this extra block type ("uc") TSize Short total data size for this block Version 1 byte version of this extra field, currently 1 ComCRC32 4 bytes Comment Field CRC32 Checksum UnicodeCom Variable UTF-8 version of the entry comment
Currently Version is set to the number 1. If there is a need to change this field, the version will be incremented. Changes may not be backward compatible so this extra field should not be used if the version is not recognized.
The ComCRC32 is the standard zip CRC32 checksum of the File Comment field in the central directory header. This is used to verify that the comment field has not changed since the Unicode Comment extra field was created. This can happen if a utility changes the File Comment field but does not update the UTF-8 Comment extra field. If the CRC check fails, this Unicode Comment extra field should be ignored and the File Comment field in the header should be used instead.
The UnicodeCom field is the UTF-8 version of the File Comment field in the header. As UnicodeCom is defined to be UTF-8, no UTF-8 byte order mark (BOM) is used. The length of this field is determined by subtracting the size of the previous fields from TSize. If both the File Name and Comment fields are UTF-8, the new General Purpose Bit Flag, bit 11 (Language encoding flag (EFS)), can be used to indicate both the header File Name and Comment fields are UTF-8 and, in this case, the Unicode Path and Unicode Comment extra fields are not needed and should not be created. Note that, for backward compatibility, bit 11 should only be used if the native character set of the paths and comments being zipped up are already in UTF-8. It is expected that the same file comment storage method, either general purpose bit 11 or extra fields, be used in both the Local and Central Directory Header for a file.
$crc32 : int
$unicodeValue : string
unpackLocalFileData(string $buffer, \PhpZip\Model\ZipEntry|null $entry = null) : static
Populate data from this array as if it was in local file data.
| string | $buffer | the buffer to read data from |
| \PhpZip\Model\ZipEntry|null | $entry |
on error
unpackCentralDirData(string $buffer, \PhpZip\Model\ZipEntry|null $entry = null) : static
Populate data from this array as if it was in central directory data.
| string | $buffer | the buffer to read data from |
| \PhpZip\Model\ZipEntry|null | $entry |
on error