public override long Seek(long offset, SeekOrigin origin)
{
long num = StreamHelpers.ComputeNewPosition(offset, origin, Length, Position);
long num2 = 0L;
int i;
for (i = 0; i < commandSummary.Count; i++)
{
long num3 = num2;
CommandPosition commandPosition = commandSummary[i];
long num4 = num3 + commandPosition.Command.Length;
if (num4 > num)
{
break;
}
num2 = num4;
}
if (i == commandSummary.Count)
{
throw new ArgumentException("The specified offset is past the end of the stream");
}
delta.Seek(commandSummary[i].DeltaStartPosition, SeekOrigin.Begin);
Command command = ReadCommand(deltaReader);
currentCopyHelper = ConstructCopyHelperForCommand(command, input, delta);
currentCopyHelper.SeekForward(num - num2);
outputPosition = num;
return(num);
}
protected void btnDownload_Click(object sender, EventArgs e)
{
Stream outputStream = ExecuteMerge("all", DocumentFormat.Rtf);
outputStream.Seek(0, SeekOrigin.Begin);
StreamCopyHelper.Copy(outputStream, Response.OutputStream);
Response.StatusCode = (int)HttpStatusCode.OK;
Response.ContentType = "application/rtf";
Response.AddHeader("Content-Disposition", "attachment; filename=RichEditMailMerge.rtf");
Response.End();
}
private void RefreshPreview(string previewName)
{
Response.StatusCode = (int)HttpStatusCode.OK;
Response.ContentType = "text/html";
Stream outputStream = ExecuteMerge(previewName, DocumentFormat.Html);
outputStream.Seek(0, SeekOrigin.Begin);
StreamCopyHelper.Copy(outputStream, Response.OutputStream);
Response.End();
}
public PatchedStream(Stream input, Stream delta)
{
this.input = input;
this.delta = delta;
deltaReader = new BinaryReader(this.delta);
ReadHeader(deltaReader);
long position = this.delta.Position;
commandSummary = ReadCommandSummary(this.delta);
this.delta.Seek(position, SeekOrigin.Begin);
currentCopyHelper = new StreamCopyHelper(0L, input);
}
private int ReadInternalSync(byte[] buffer, int offset, int count)
{
if (!currentCopyHelper.MoreData)
{
Command command = ReadCommand(deltaReader);
currentCopyHelper = ConstructCopyHelperForCommand(command, input, delta);
if (currentCopyHelper == null)
{
return(0);
}
}
int num = currentCopyHelper.Read(buffer, offset, count);
outputPosition += num;
return(num);
}
public PatchedStream(Stream input, Stream delta)
{
this.input = input;
this.delta = delta;
this.deltaReader = new BinaryReader(this.delta);
// read and check the header
PatchedStream.ReadHeader(this.deltaReader);
// Read in all of the commands from the delta to build a table which will tell us the length of the
// resulting stream, as well as tell us how to seek into the file
var currentPosition = this.delta.Position;
this.commandSummary = ReadCommandSummary(this.delta);
this.delta.Seek(currentPosition, SeekOrigin.Begin);
// starting the current helper with 0 bytes left will force us to immediately read a new command
this.currentCopyHelper = new StreamCopyHelper(0, input);
}
public PatchedStream(Stream input, Stream delta)
{
this.input = input;
this.delta = delta;
this.deltaReader = new BinaryReader(this.delta);
// read and check the header
PatchedStream.ReadHeader(this.deltaReader);
// Read in all of the commands from the delta to build a table which will tell us the length of the
// resulting stream, as well as tell us how to seek into the file
var currentPosition = this.delta.Position;
this.commandSummary = ReadCommandSummary(this.delta);
this.delta.Seek(currentPosition, SeekOrigin.Begin);
// starting the current helper with 0 bytes left will force us to immediately read a new command
this.currentCopyHelper = new StreamCopyHelper(0, input);
}
public override async Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
// if the current command can't supply any more data, then read a new command
if (!this.currentCopyHelper.MoreData)
{
// read the next command from the delta stream
var command = ReadCommand(this.deltaReader);
// construct a copy helper to run that command
this.currentCopyHelper = ConstructCopyHelperForCommand(command, this.input, this.delta);
if (this.currentCopyHelper == null)
{
// if it's null, that means we reached the end token
return 0;
}
}
// now read the data based on the copy helper
int bytesRead = await this.currentCopyHelper.ReadAsync(buffer, offset, count, cancellationToken);
this.outputPosition += bytesRead;
return bytesRead;
}
public override async Task <int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
// if the current command can't supply any more data, then read a new command
if (!this.currentCopyHelper.MoreData)
{
// read the next command from the delta stream
var command = ReadCommand(this.deltaReader);
// construct a copy helper to run that command
this.currentCopyHelper = ConstructCopyHelperForCommand(command, this.input, this.delta);
if (this.currentCopyHelper == null)
{
// if it's null, that means we reached the end token
return(0);
}
}
// now read the data based on the copy helper
int bytesRead = await this.currentCopyHelper.ReadAsync(buffer, offset, count, cancellationToken);
this.outputPosition += bytesRead;
return(bytesRead);
}
public override long Seek(long offset, SeekOrigin origin)
{
long newPosition = StreamHelpers.ComputeNewPosition(offset, origin, this.Length, this.Position);
// search until we find the command just before this position
long runningTotal = 0;
int i;
for (i = 0; i < this.commandSummary.Count; i++)
{
// if this is the first command that takes us past the desired position
long newTotal = runningTotal + this.commandSummary[i].Command.Length;
if (newTotal > newPosition)
{
break;
}
runningTotal = newTotal;
}
if (i == this.commandSummary.Count)
{
throw new ArgumentException("The specified offset is past the end of the stream");
}
// seek to the point that that command starts
this.delta.Seek(this.commandSummary[i].DeltaStartPosition, SeekOrigin.Begin);
// now read that command in
var command = ReadCommand(this.deltaReader);
// construct a copy helper to run that command
this.currentCopyHelper = ConstructCopyHelperForCommand(command, this.input, this.delta);
// finally seek into the copy helper for whatever bytes are left over
this.currentCopyHelper.SeekForward(newPosition - runningTotal);
this.outputPosition = newPosition;
return(newPosition);
}
public override long Seek(long offset, SeekOrigin origin)
{
long newPosition = StreamHelpers.ComputeNewPosition(offset, origin, this.Length, this.Position);
// search until we find the command just before this position
long runningTotal = 0;
int i;
for (i = 0; i < this.commandSummary.Count; i++)
{
// if this is the first command that takes us past the desired position
long newTotal = runningTotal + this.commandSummary[i].Command.Length;
if (newTotal > newPosition)
{
break;
}
runningTotal = newTotal;
}
if (i == this.commandSummary.Count)
{
throw new ArgumentException("The specified offset is past the end of the stream");
}
// seek to the point that that command starts
this.delta.Seek(this.commandSummary[i].DeltaStartPosition, SeekOrigin.Begin);
// now read that command in
var command = ReadCommand(this.deltaReader);
// construct a copy helper to run that command
this.currentCopyHelper = ConstructCopyHelperForCommand(command, this.input, this.delta);
// finally seek into the copy helper for whatever bytes are left over
this.currentCopyHelper.SeekForward(newPosition - runningTotal);
this.outputPosition = newPosition;
return newPosition;
}
