/// <summary>
/// Searches the current ByteProvider
/// </summary>
/// <param name="options">contains all find options</param>
/// <returns>the SelectionStart property value if find was successful or
/// -1 if there is no match
/// -2 if Find was aborted.</returns>
public long FindPrev(FindOptions options)
{
var startIndex = SelectionStart;
int match = 0;
byte[] buffer1 = null;
byte[] buffer2 = null;
if (options.Type == FindType.Text && options.MatchCase)
{
if (options.FindBuffer == null || options.FindBuffer.Length == 0)
throw new ArgumentException("FindBuffer can not be null when Type: Text and MatchCase: false");
buffer1 = options.FindBuffer;
}
else if (options.Type == FindType.Text && !options.MatchCase)
{
if (options.FindBufferLowerCase == null || options.FindBufferLowerCase.Length == 0)
throw new ArgumentException("FindBufferLowerCase can not be null when Type is Text and MatchCase is true");
if (options.FindBufferUpperCase == null || options.FindBufferUpperCase.Length == 0)
throw new ArgumentException("FindBufferUpperCase can not be null when Type is Text and MatchCase is true");
if (options.FindBufferLowerCase.Length != options.FindBufferUpperCase.Length)
throw new ArgumentException("FindBufferUpperCase and FindBufferUpperCase must have the same size when Type is Text and MatchCase is true");
buffer1 = options.FindBufferLowerCase;
buffer2 = options.FindBufferUpperCase;
}
else if (options.Type == FindType.Hex)
{
if (options.Hex == null || options.Hex.Length == 0)
{
return -2;
//throw new ArgumentException("Hex can not be null when Type is Hex");
}
buffer1 = options.Hex;
}
int buffer1Length = buffer1.Length;
_abortFind = false;
for (long pos = startIndex; pos >= 0; pos--)
{
if (_abortFind)
return -2;
if (pos % 1000 == 0) // for performance reasons: DoEvents only 1 times per 1000 loops
Application.DoEvents();
byte compareByte = _byteProvider.ReadByte(pos);
bool buffer1Match = compareByte == buffer1[buffer1.Length - 1 - match];
bool hasBuffer2 = buffer2 != null;
bool buffer2Match = hasBuffer2 ? compareByte == buffer2[buffer2.Length - 1 - match] : false;
bool isMatch = buffer1Match || buffer2Match;
if (!isMatch)
{
pos += match;
match = 0;
_findingPos = pos;
continue;
}
match++;
if (match == buffer1Length)
{
long bytePos = pos;
Select(bytePos, buffer1Length);
ScrollByteIntoView(_bytePos + _selectionLength);
ScrollByteIntoView(_bytePos);
return bytePos;
}
}
return -1;
}
void FindNext()
{
if (_findBuffer.Length == 0)
{
Find();
return;
}
// show cancel dialog
_formFindCancel = new FormFindCancel();
_formFindCancel.SetHexBox(hexBox1);
_formFindCancel.Closed += new EventHandler(FormFindCancel_Closed);
_formFindCancel.Show();
// block activation of main form
//Activated += new EventHandler(FocusToFormFindCancel);
// start find process
FindOptions fo = new FindOptions();
fo.Hex = _findBuffer;
fo.Type = FindType.Hex;
//long res = hexBox1.Find(_findBuffer, hexBox1.SelectionStart + hexBox1.SelectionLength);
long res = hexBox1.Find(fo);
_formFindCancel.Dispose();
// unblock activation of main form
//Activated -= new EventHandler(FocusToFormFindCancel);
if (res == -1) // -1 = no match
{
MessageBox.Show("Find reached end of file", "EDC15P Suite",
MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else if (res == -2) // -2 = find was aborted
{
return;
}
else // something was found
{
if (!hexBox1.Focused)
hexBox1.Focus();
}
ManageAbility();
}