public static void OverwriteSequenceNumbers(File file,
long position,
IDictionary <uint, int> shiftTable)
{
bool done = true;
foreach (KeyValuePair <uint, int> pair in shiftTable)
{
if (pair.Value != 0)
{
done = false;
break;
}
}
if (done)
{
return;
}
while (position < file.Length)
{
PageHeader header = new PageHeader(file, position);
int size = (int)(header.Size + header.DataSize);
if (shiftTable.ContainsKey(header.StreamSerialNumber) &&
shiftTable [header.StreamSerialNumber] != 0)
{
file.Seek(position);
ByteVector page_data = file.ReadBlock(size);
ByteVector new_data = ByteVector.FromUInt(
(uint)(header.PageSequenceNumber +
shiftTable [header.StreamSerialNumber]),
false);
for (int i = 18; i < 22; i++)
{
page_data [i] = new_data [i - 18];
}
for (int i = 22; i < 26; i++)
{
page_data [i] = 0;
}
new_data.Add(ByteVector.FromUInt(
page_data.Checksum, false));
file.Seek(position + 18);
file.WriteBlock(new_data);
}
position += size;
}
}
public static void OverwriteSequenceNumbers (File file,
long position,
IDictionary<uint, int> shiftTable)
{
bool done = true;
foreach (KeyValuePair<uint, int> pair in shiftTable)
if (pair.Value != 0) {
done = false;
break;
}
if (done)
return;
while (position < file.Length) {
PageHeader header = new PageHeader (file, position);
int size = (int) (header.Size + header.DataSize);
if (shiftTable.ContainsKey (header.StreamSerialNumber)
&& shiftTable [header.StreamSerialNumber] != 0) {
file.Seek (position);
ByteVector page_data = file.ReadBlock (size);
ByteVector new_data = ByteVector.FromUInt (
(uint)(header.PageSequenceNumber +
shiftTable [header.StreamSerialNumber]),
false);
for (int i = 18; i < 22; i ++)
page_data [i] = new_data [i - 18];
for (int i = 22; i < 26; i++)
page_data [i] = 0;
new_data.Add (ByteVector.FromUInt (
page_data.Checksum, false));
file.Seek (position + 18);
file.WriteBlock (new_data);
}
position += size;
}
}
/// <summary>
/// Overwrites all page headers in a file starting at a
/// specified position, shifting the page sequence numbers
/// a set amount.
/// </summary>
/// <param name="file">
/// A <see cref="File" /> object containing the file to
/// update.
/// </param>
/// <param name="position">
/// A <see cref="long" /> value specify at what position to
/// start updating.
/// </param>
/// <param name="shiftTable">
/// A <see cref="T:System.Collections.Generic.IDictionary`2"
/// /> object where the key is the serial number of the
/// stream to update and the value is the amount to offset
/// the page sequence numbers in the stream.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="file" /> or <paramref name="shiftTable"
/// /> is <see langword="null" />.
/// </exception>
/// <remarks>
/// When the number of pages in a stream changes, all
/// subsequent pages in the stream need to have their page
/// sequence number update in order to remain valid.
/// Additionally, when the page sequence number changes, the
/// page needs to have its checksum recomputed. This makes
/// for a costly recalculation if large comment data is
/// added.
/// </remarks>
public static void OverwriteSequenceNumbers(File file,
long position,
IDictionary <uint, int> shiftTable)
{
if (file == null)
{
throw new ArgumentNullException("file");
}
if (shiftTable == null)
{
throw new ArgumentNullException("shiftTable");
}
// Check to see if there are no changes to be made.
bool done = true;
foreach (KeyValuePair <uint, int> pair in shiftTable)
{
if (pair.Value != 0)
{
done = false;
break;
}
}
// If the file is fine, quit.
if (done)
{
return;
}
while (position < file.Length - 27)
{
PageHeader header = new PageHeader(file, position);
int size = (int)(header.Size + header.DataSize);
if (shiftTable.ContainsKey(header.StreamSerialNumber) &&
shiftTable [header.StreamSerialNumber] != 0)
{
file.Seek(position);
ByteVector page_data = file.ReadBlock(size);
ByteVector new_data = ByteVector.FromUInt(
(uint)(header.PageSequenceNumber +
shiftTable [header.StreamSerialNumber]),
false);
for (int i = 18; i < 22; i++)
{
page_data [i] = new_data [i - 18];
}
for (int i = 22; i < 26; i++)
{
page_data [i] = 0;
}
new_data.Add(ByteVector.FromUInt(
page_data.Checksum, false));
file.Seek(position + 18);
file.WriteBlock(new_data);
}
position += size;
}
}
/// <summary>
/// Overwrites all page headers in a file starting at a
/// specified position, shifting the page sequence numbers
/// a set amount.
/// </summary>
/// <param name="file">
/// A <see cref="File" /> object containing the file to
/// update.
/// </param>
/// <param name="position">
/// A <see cref="long" /> value specify at what position to
/// start updating.
/// </param>
/// <param name="shiftTable">
/// A <see cref="T:System.Collections.Generic.IDictionary`2"
/// /> object where the key is the serial number of the
/// stream to update and the value is the amount to offset
/// the page sequence numbers in the stream.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="file" /> or <paramref name="shiftTable"
/// /> is <see langword="null" />.
/// </exception>
/// <remarks>
/// When the number of pages in a stream changes, all
/// subsequent pages in the stream need to have their page
/// sequence number update in order to remain valid.
/// Additionally, when the page sequence number changes, the
/// page needs to have its checksum recomputed. This makes
/// for a costly recalculation if large comment data is
/// added.
/// </remarks>
public static void OverwriteSequenceNumbers (File file,
long position,
IDictionary<uint, int> shiftTable)
{
if (file == null)
throw new ArgumentNullException ("file");
if (shiftTable == null)
throw new ArgumentNullException ("shiftTable");
// Check to see if there are no changes to be made.
bool done = true;
foreach (KeyValuePair<uint, int> pair in shiftTable)
if (pair.Value != 0) {
done = false;
break;
}
// If the file is fine, quit.
if (done)
return;
while (position < file.Length - 27) {
PageHeader header = new PageHeader (file, position);
int size = (int) (header.Size + header.DataSize);
if (shiftTable.ContainsKey (header.StreamSerialNumber)
&& shiftTable [header.StreamSerialNumber] != 0) {
file.Seek (position);
ByteVector page_data = file.ReadBlock (size);
ByteVector new_data = ByteVector.FromUInt (
(uint)(header.PageSequenceNumber +
shiftTable [header.StreamSerialNumber]),
false);
for (int i = 18; i < 22; i ++)
page_data [i] = new_data [i - 18];
for (int i = 22; i < 26; i++)
page_data [i] = 0;
new_data.Add (ByteVector.FromUInt (
page_data.Checksum, false));
file.Seek (position + 18);
file.WriteBlock (new_data);
}
position += size;
}
}
