public static int GetSignatureCentralDirectoryIndex(SignedPackageArchiveMetadata metadata, SigningSpecifications signingSpecification)
{
var centralDirectoryRecords = metadata.CentralDirectoryHeaders;
var centralDirectoryRecordsCount = centralDirectoryRecords.Count;
for (var centralDirectoryRecordIndex = 0; centralDirectoryRecordIndex < centralDirectoryRecordsCount; centralDirectoryRecordIndex++)
{
var record = centralDirectoryRecords[centralDirectoryRecordIndex];
if (record.IsPackageSignatureFile)
{
return(centralDirectoryRecordIndex);
}
}
return(-1);
}
public static int GetSignatureCentralDirectoryIndex(SignedPackageArchiveMetadata metadata, SigningSpecifications signingSpecification)
{
var centralDirectoryRecords = metadata.CentralDirectoryHeaders;
var centralDirectoryRecordsCount = centralDirectoryRecords.Count;
for (var centralDirectoryRecordIndex = 0; centralDirectoryRecordIndex < centralDirectoryRecordsCount; centralDirectoryRecordIndex++)
{
var record = centralDirectoryRecords[centralDirectoryRecordIndex];
if (StringComparer.Ordinal.Equals(record.Filename, signingSpecification.SignaturePath))
{
return(centralDirectoryRecordIndex);
}
}
return(-1);
}
private static List <CentralDirectoryHeaderMetadata> ShiftMetadata(
SigningSpecifications spec,
SignedPackageArchiveMetadata metadata,
int newSignatureFileEntryIndex,
int newSignatureCentralDirectoryRecordIndex)
{
var shiftedCdr = new List <CentralDirectoryHeaderMetadata>(metadata.CentralDirectoryHeaders);
// Sort Central Directory records in the order the file entries appear in the original archive
shiftedCdr.Sort((x, y) => x.OffsetToFileHeader.CompareTo(y.OffsetToFileHeader));
// Shift Central Directory records to the desired position.
// Because we sorted in the file entry order this will shift
// the file entries
ShiftSignatureToIndex(spec, shiftedCdr, newSignatureFileEntryIndex);
// Calculate the change in offsets for the shifted file entries
var lastEntryEnd = 0L;
foreach (var cdr in shiftedCdr)
{
cdr.ChangeInOffset = lastEntryEnd - cdr.OffsetToFileHeader;
lastEntryEnd = cdr.OffsetToFileHeader + cdr.FileEntryTotalSize + cdr.ChangeInOffset;
}
// Now we sort the central directory records in the order thecentral directory records appear in the original archive
shiftedCdr.Sort((x, y) => x.Position.CompareTo(y.Position));
// Shift Central Directory records to the desired position.
// Because we sorted in the central directory records order this will shift
// the central directory records
ShiftSignatureToIndex(spec, shiftedCdr, newSignatureCentralDirectoryRecordIndex);
// Calculate the new indexes for each central directory record
var lastIndex = 0;
foreach (var cdr in shiftedCdr)
{
cdr.IndexInHeaders = lastIndex;
lastIndex++;
}
return(shiftedCdr);
}
