/**
* Parses the supported flags from the given archive data.
* @param data local file header or a central directory entry.
* @param offset offset at which the general purpose bit starts
*/
public static GeneralPurposeBit parse(byte[] data, int offset)
{
int generalPurposeFlag = ZipShort.getValue(data, offset);
GeneralPurposeBit b = new GeneralPurposeBit();
b.useDataDescriptor((generalPurposeFlag & DATA_DESCRIPTOR_FLAG) != 0);
b.useUTF8ForNames((generalPurposeFlag & UFT8_NAMES_FLAG) != 0);
b.useStrongEncryption((generalPurposeFlag & STRONG_ENCRYPTION_FLAG)
!= 0);
b.useEncryption((generalPurposeFlag & ENCRYPTION_FLAG) != 0);
return(b);
}
private void writeVersionNeededToExtractAndGeneralPurposeBits(int zipMethod,
bool utfFallback)
//throws IOException
{
// CheckStyle:MagicNumber OFF
int versionNeededToExtract = 10;
GeneralPurposeBit b = new GeneralPurposeBit();
b.useUTF8ForNames(useUTF8Flag || utfFallback);
if (zipMethod == DEFLATED && raf == null)
{
// requires version 2 as we are going to store length info
// in the data descriptor
versionNeededToExtract = 20;
b.useDataDescriptor(true);
}
// CheckStyle:MagicNumber ON
// version needed to extract
writeOut(ZipShort.getBytes(versionNeededToExtract));
// general purpose bit flag
writeOut(b.encode());
}