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Important Update:

Browse Source 
- Improve parameter checking before function execution
- Rename functions:
  Get->Peek, ReadFD->ReadFromFD, WriteFD->WriteToFD
- Add StartPos param to Peek() & FindChar()
- Add ClearChar param for GetChar()
- Add default values for Position and Lengths
  Get, Set, Clear, Push, Peek, GetChar, FindChar
This commit is contained in:
Charl Wentzel
2016-05-19 07:44:28 +02:00
parent c50766021a
commit 839c8a1432
3 changed files with 107 additions and 45 deletions
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118
BufferCore.cpp
View File

@@ -48,11 +48,15 @@ CBuffer::~CBuffer()
//---------------------------------------------------------------------------
// Over write existing buffer with new data
int CBuffer::Set( char * Data, int Len )
int CBuffer::Set( const char * Data, int Len )
{
// Validate data
if (!Data || !Len)
if (!Data || !Len) {
return 0;
}
else if (Len == -1) {
Len = strlen( Data );
}
if (Len <= BufSize) {
memcpy( Buffer, Data, Len );
@@ -71,9 +75,10 @@ int CBuffer::Set( char * Data, int Len )
//---------------------------------------------------------------------------
// Return "stitched" buffer data in temporary buffer
int CBuffer::Get( char ** Data, int MaxLen )
int CBuffer::Peek( char ** Data, int PeekPos, int MaxLen )
{
int BytesReturned = 0;
int StartPos = 0;
// Check if any data
if (!BufLen || !MaxLen) {
@@ -81,19 +86,31 @@ int CBuffer::Get( char ** Data, int MaxLen )
return 0;
}
// Validate start position
if (PeekPos >= BufLen) {
*Data = NULL;
return 0;
}
else if (BufStart + StartPos < BufSize) {
StartPos = BufStart + PeekPos;
}
else {
StartPos = BufStart + PeekPos - BufSize;
}
// Validate MaxLen
if ((MaxLen == -1) || (MaxLen > BufSize)) {
MaxLen = BufSize;
}
BytesReturned = (MaxLen > BufLen)? BufLen : MaxLen;
BytesReturned = (MaxLen > BufLen - PeekPos)? (BufLen - PeekPos) : MaxLen;
// Copy Data from Buffer
if (BufStart + BytesReturned < BufSize) {
memcpy( OutBuffer, &Buffer[BufStart], BytesReturned );
if (StartPos + BytesReturned <= BufSize) {
memcpy( OutBuffer, &Buffer[StartPos], BytesReturned );
}
else {
memcpy( OutBuffer, &Buffer[BufStart], BufSize-BufStart ); // Copy from end of buffer
memcpy( &OutBuffer[BufSize-BufStart], Buffer, (BytesReturned-(BufSize-BufStart)) ); // Copy rollover from start of buffer
memcpy( OutBuffer, &Buffer[StartPos], BufSize-StartPos ); // Copy from end of buffer
memcpy( &OutBuffer[BufSize-StartPos], Buffer, (BytesReturned-(BufSize-StartPos)) ); // Copy rollover from start of buffer
}
OutBuffer[BytesReturned] = 0;
@@ -108,7 +125,12 @@ int CBuffer::Clear( int ClearLen )
int BytesCleared;
// Validate ClearLen
BytesCleared = (ClearLen > BufSize)? BufSize : ClearLen;
if (ClearLen == -1) {
BytesCleared = BufLen;
}
else {
BytesCleared = (ClearLen > BufLen)? BufLen : ClearLen;
}
// Update Buffer pointers
if (BufStart + BytesCleared < BufSize) {
@@ -139,17 +161,20 @@ int CBuffer::Reset()
// Add bytes to end of buffer
// Return "stitched" buffer data in temporary buffer
int CBuffer::Push( char * Data, int Len )
int CBuffer::Push( const char * Data, int Len )
{
int BytesPushed = 0;
int TotalPushed = 0;
int BufRemain = 0;
int DataRemain = Len;
// Check if buffer created
if (!BufSize) {
// Validate Buffer and Len
if (!BufSize || !Len) {
return 0;
}
else if (Len == -1) {
Len = strlen( Data );
}
// Read Data into buffer
while (TotalPushed < Len)
@@ -188,7 +213,7 @@ int CBuffer::Pop( char ** Data, int MaxLen )
int BytesWritten = 0;
// Read data
BytesWritten = Get( Data, MaxLen );
BytesWritten = Peek( Data, MaxLen );
// Clear bytes
Clear( BytesWritten );
@@ -199,7 +224,7 @@ int CBuffer::Pop( char ** Data, int MaxLen )
//---------------------------------------------------------------------------
// Read File descriptor directly into rolling buffer
int CBuffer::ReadFD( int Handle, int MaxRead )
int CBuffer::ReadFromFD( int Handle, int MaxRead )
{
int BytesRead = 0;
int TotalRead = 0;
@@ -242,12 +267,13 @@ int CBuffer::ReadFD( int Handle, int MaxRead )
//---------------------------------------------------------------------------
// Write given number of bytes directly from buffer to File descriptor
int CBuffer::WriteFD( int Handle, int MaxLen )
int CBuffer::WriteToFD( int Handle, int MaxLen )
{
int BytesWritten = 0;
int TotalWritten = 0;
int BufRemain = 0;
int DataRemain = 0;
int ReadPos = 0;
// Check if buffer created
if (!BufSize) {
@@ -255,12 +281,13 @@ int CBuffer::WriteFD( int Handle, int MaxLen )
}
// Read Data into buffer
ReadPos = BufStart;
DataRemain = (MaxLen == -1)? BufLen : MaxLen;
while ((TotalWritten < MaxLen) && (BufLen > 0))
{
// Read from file descriptor
BufRemain = BufSize - BufStart;
BytesWritten = write( Handle, &Buffer[BufStart], ((BufRemain > DataRemain)? DataRemain : BufRemain) );
BufRemain = BufSize - ReadPos;
BytesWritten = write( Handle, &Buffer[ReadPos], ((BufRemain > DataRemain)? DataRemain : BufRemain) );
if (BytesWritten <= 0)
break;
@@ -270,10 +297,9 @@ int CBuffer::WriteFD( int Handle, int MaxLen )
// Update Buffer Pointers
BufLen -= BytesWritten;
BufStart += BytesWritten;
if (BufStart >= BufSize) {
// Rolling over end of buffer, start at beginning
BufStart = 0;
ReadPos += BytesWritten;
if (ReadPos >= BufSize) {
ReadPos = 0; // Rolling over end of buffer, start at beginning
}
}
@@ -282,48 +308,78 @@ int CBuffer::WriteFD( int Handle, int MaxLen )
//---------------------------------------------------------------------------
// Return specific character for current rolling data
char CBuffer::GetChar( int Pos )
char CBuffer::PeekChar( int Pos, bool ClearChar )
{
char CharValue = 0;
// Validate buffer and Pos
if (!BufLen) {
return 0;
}
else if (BufStart + Pos < BufSize) {
return Buffer[ BufStart+Pos ];
// Get char
if (BufStart + Pos < BufSize) {
CharValue = Buffer[ BufStart+Pos ];
}
else {
return Buffer[ BufStart+Pos-BufSize ];
CharValue = Buffer[ BufStart+Pos-BufSize ];
}
// Clear Char
if (ClearChar && (Pos == 0)) {
BufStart++;
BufLen--;
}
// Return char
return CharValue;
}
//---------------------------------------------------------------------------
// Look for first occureance of character in buffer
bool CBuffer::FindChar( char SearchChar, int &Pos )
// Look for first occurrence of character in buffer
bool CBuffer::FindChar( char SearchChar, int &FoundPos, int StartPos )
{
char * CheckPos;
char * Limit;
// Check if buffer exists
if (!BufLen) {
FoundPos = -1;
return false;
}
// Validate start Pos
if (StartPos >= BufLen) {
FoundPos = -1;
return false;
}
// Get Search start point
if (BufStart + StartPos < BufSize) {
CheckPos = &Buffer[ BufStart+StartPos ];
} else {
CheckPos = &Buffer[ (BufStart+StartPos)-BufSize ];
}
// Search for char
Pos = 0;
CheckPos = &Buffer[BufStart];
FoundPos = StartPos;
Limit = &Buffer[BufSize-1];
while (Pos < BufLen)
while (FoundPos < BufLen)
{
if (*CheckPos == SearchChar)
return true;
// Next char
Pos++;
FoundPos++;
if (CheckPos == Limit) {
CheckPos = Buffer; // Roll-over, Start at beginning of buffer
} else {
CheckPos++;
}
}
// Not Found
FoundPos = -1;
return false;
}
//---------------------------------------------------------------------------