public MatchInfo ReadFromBuffer(byte[] bytes, int length, int minLength, TimeSpan? wait = null, bool consume = true)
{
MatchInfo info = new MatchInfo();
info.BytesConsumed = 0;
info.BytesSkipped = 0;
info.Matched = true;
info.Timeout = false;
info.TotalBytesRead = 0;
bool timeOut;
if (minLength > length)
minLength = length;
int count = 0;
DateTime startTime = DateTime.Now;
int immediate;
if (BytesUsed >= length)
immediate = length;
else
immediate = BytesUsed;
int fromPos = FirstByteUsed;
int toPos = 0;
for (int cnt = 0; cnt < immediate; cnt++)
bytes[toPos++] = LocalBuffer[fromPos++];
count = immediate;
if (consume)
{
BytesUsed -= count;
BytesRead += count;
// when buffer is empty, set next byte avail to start of buffer
if (BytesUsed == 0)
NextByteAvail = 0;
}
if (count < minLength)
{
int remaining = length - count;
// ensure buffer has room to read in the required extra bytes
if (!consume && remaining > BytesAvailable)
{
ShiftOrReallocateBuffer(BytesUsed + remaining);
if (remaining > BytesAvailable)
{
LogMessage("ReadFromBuffer", "Error adjusting buffer for non-consuming read: " + length, LogEntryType.ErrorMessage);
info.Matched = false;
return info;
}
}
do
{
int readCount;
readCount = ReadFromStreamToBuffer(remaining, out timeOut);
if (consume)
fromPos = FirstByteUsed;
else
fromPos = FirstByteUsed + count;
toPos = count;
for (int cnt = 0; cnt < readCount; cnt++)
bytes[toPos++] = LocalBuffer[fromPos++];
count += readCount;
if (consume)
{
BytesRead += readCount;
BytesUsed -= readCount;
if (BytesUsed == 0)
NextByteAvail = 0;
}
remaining -= readCount;
if (count >= minLength)
break;
if (timeOut)
{
info.Timeout = true;
info.Matched = false;
break;
}
}
while (count < length);
}
info.BytesConsumed = count;
info.TotalBytesRead = count;
if (SystemServices.LogMessageContent)
{
LogMessage("ReadFromBuffer", "Matched: " + info.Matched + " - Timeout: " + info.Timeout +
" - BytesRead: " + info.BytesRead + " - Bytes[" + count + "] next line", LogEntryType.MeterMessage);
FormatDump(bytes, 0, count, SystemServices);
}
return info;
}
public MatchInfo FindInBuffer(byte[] pattern, int maxSkip, bool consume, TimeSpan? wait, bool extractSkipped, out DataChunk skippedChunk)
{
int totalCount = 0;
int maxScan = maxSkip + pattern.Length;
DateTime startTime = DateTime.Now;
int patternPos = 0;
bool matchstarted = false;
MatchInfo info = new MatchInfo();
DataChunk skipped;
if (extractSkipped)
skipped = new DataChunk(maxSkip);
else
skipped = null;
skippedChunk = skipped;
int bytesRequired = pattern.Length + maxSkip;
if (bytesRequired > BytesAvailable + BytesUsed)
ShiftOrReallocateBuffer(bytesRequired);
bool skippedExceeded = false;
while (totalCount < maxScan && !info.Matched && !skippedExceeded)
{
int remaining = maxScan - totalCount;
if ((BytesUsed - totalCount) == 0)
{
int readCount;
bool timeOut;
readCount = ReadFromStreamToBuffer(remaining, out timeOut);
if (timeOut)
{
info.Timeout = true;
LogMessage("FindInBuffer", "Timeout: " + wait.Value.ToString(), LogEntryType.MeterMessage);
break;
}
}
else if ((BytesUsed - totalCount) < 0)
{
LogMessage("FindInBuffer", "Logic error - totalCount exceeds buffer content", LogEntryType.ErrorMessage);
totalCount = 0;
info.Matched = false;
info.BytesSkipped = 0;
info.BytesConsumed = 0;
break;
}
if ((BytesUsed - totalCount) > 0)
{
while ((FirstByteUsed + totalCount) < NextByteAvail)
{
matchstarted = (pattern[patternPos] == LocalBuffer[FirstByteUsed + totalCount++]);
if (matchstarted)
{
if (++patternPos == pattern.Length)
{
info.Matched = true;
break;
}
}
else
{
if (totalCount > maxSkip)
{
skippedExceeded = true;
break;
}
info.BytesSkipped = totalCount;
if (extractSkipped)
{
// increment skipped size
skipped.ChunkSize = totalCount;
// copy up to mismatch character
int offset = (totalCount - 1) - patternPos;
while (offset < totalCount)
{
skipped.ChunkBytes[offset] = LocalBuffer[FirstByteUsed + offset];
offset++;
}
}
//reset to start of pattern
patternPos = 0;
}
}
}
}
if (consume)
{
BytesUsed -= totalCount;
if (BytesUsed == 0)
NextByteAvail = 0;
info.BytesConsumed = totalCount; // total bytes matched or skipped
}
BytesRead += info.BytesConsumed;
info.TotalBytesRead = totalCount;
if (SystemServices.LogMessageContent)
{
if (info.BytesSkipped > 0)
{
LogMessage("FindInBuffer", "Skipped[" + info.BytesSkipped + "] next line", LogEntryType.MeterMessage);
FormatDump(skippedChunk.ChunkBytes, 0, skippedChunk.ChunkSize, SystemServices);
}
LogMessage("FindInBuffer", "Matched: " + info.Matched + " - Timeout: " + info.Timeout +
" - BytesRead: " + info.BytesRead + " - TotalBytesRead: " + info.TotalBytesRead + " - Pattern[" + pattern.Length + "] next line", LogEntryType.MeterMessage);
FormatDump(pattern, 0, pattern.Length, SystemServices);
}
return info;
}
