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utlbuffer.cpp
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//===== Copyright © 1996-2005, Valve Corporation, All rights reserved. ======//
//
// $Header: $
// $NoKeywords: $
//
// Serialization buffer
//===========================================================================//
#pragma warning (disable : 4514)
#include "utlbuffer.h"
#include <stdio.h>
#include <stdarg.h>
#include <ctype.h>
#include <stdlib.h>
#include <limits.h>
#include "tier1/strtools.h"
#include "tier1/characterset.h"
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"
//-----------------------------------------------------------------------------
// Character conversions for C strings
//-----------------------------------------------------------------------------
class CUtlCStringConversion : public CUtlCharConversion
{
public:
CUtlCStringConversion( char nEscapeChar, const char *pDelimiter, int nCount, ConversionArray_t *pArray );
// Finds a conversion for the passed-in string, returns length
virtual char FindConversion( const char *pString, int *pLength );
private:
char m_pConversion[256];
};
//-----------------------------------------------------------------------------
// Character conversions for no-escape sequence strings
//-----------------------------------------------------------------------------
class CUtlNoEscConversion : public CUtlCharConversion
{
public:
CUtlNoEscConversion( char nEscapeChar, const char *pDelimiter, int nCount, ConversionArray_t *pArray ) :
CUtlCharConversion( nEscapeChar, pDelimiter, nCount, pArray ) {}
// Finds a conversion for the passed-in string, returns length
virtual char FindConversion( const char *pString, int *pLength ) { *pLength = 0; return 0; }
};
//-----------------------------------------------------------------------------
// List of character conversions
//-----------------------------------------------------------------------------
BEGIN_CUSTOM_CHAR_CONVERSION( CUtlCStringConversion, s_StringCharConversion, "\"", '\\' )
{ '\n', "n" },
{ '\t', "t" },
{ '\v', "v" },
{ '\b', "b" },
{ '\r', "r" },
{ '\f', "f" },
{ '\a', "a" },
{ '\\', "\\" },
{ '\?', "\?" },
{ '\'', "\'" },
{ '\"', "\"" },
END_CUSTOM_CHAR_CONVERSION( CUtlCStringConversion, s_StringCharConversion, "\"", '\\' )
CUtlCharConversion *GetCStringCharConversion()
{
return &s_StringCharConversion;
}
BEGIN_CUSTOM_CHAR_CONVERSION( CUtlNoEscConversion, s_NoEscConversion, "\"", 0x7F )
{ 0x7F, "" },
END_CUSTOM_CHAR_CONVERSION( CUtlNoEscConversion, s_NoEscConversion, "\"", 0x7F )
CUtlCharConversion *GetNoEscCharConversion()
{
return &s_NoEscConversion;
}
//-----------------------------------------------------------------------------
// Constructor
//-----------------------------------------------------------------------------
CUtlCStringConversion::CUtlCStringConversion( char nEscapeChar, const char *pDelimiter, int nCount, ConversionArray_t *pArray ) :
CUtlCharConversion( nEscapeChar, pDelimiter, nCount, pArray )
{
memset( m_pConversion, 0x0, sizeof(m_pConversion) );
for ( int i = 0; i < nCount; ++i )
{
m_pConversion[ (unsigned char)(pArray[i].m_pReplacementString[0]) ] = pArray[i].m_nActualChar;
}
}
// Finds a conversion for the passed-in string, returns length
char CUtlCStringConversion::FindConversion( const char *pString, int *pLength )
{
char c = m_pConversion[ (unsigned char)( pString[0] ) ];
*pLength = (c != '\0') ? 1 : 0;
return c;
}
//-----------------------------------------------------------------------------
// Constructor
//-----------------------------------------------------------------------------
CUtlCharConversion::CUtlCharConversion( char nEscapeChar, const char *pDelimiter, int nCount, ConversionArray_t *pArray )
{
m_nEscapeChar = nEscapeChar;
m_pDelimiter = pDelimiter;
m_nCount = nCount;
m_nDelimiterLength = V_strlen( pDelimiter );
m_nMaxConversionLength = 0;
memset( m_pReplacements, 0, sizeof(m_pReplacements) );
for ( int i = 0; i < nCount; ++i )
{
m_pList[i] = pArray[i].m_nActualChar;
ConversionInfo_t &info = m_pReplacements[ (unsigned char)( m_pList[i] ) ];
Assert( info.m_pReplacementString == 0 );
info.m_pReplacementString = pArray[i].m_pReplacementString;
info.m_nLength = V_strlen( info.m_pReplacementString );
if ( info.m_nLength > m_nMaxConversionLength )
{
m_nMaxConversionLength = info.m_nLength;
}
}
}
//-----------------------------------------------------------------------------
// Escape character + delimiter
//-----------------------------------------------------------------------------
char CUtlCharConversion::GetEscapeChar() const
{
return m_nEscapeChar;
}
const char *CUtlCharConversion::GetDelimiter() const
{
return m_pDelimiter;
}
int CUtlCharConversion::GetDelimiterLength() const
{
return m_nDelimiterLength;
}
//-----------------------------------------------------------------------------
// Constructor
//-----------------------------------------------------------------------------
const char *CUtlCharConversion::GetConversionString( char c ) const
{
return m_pReplacements[ (unsigned char)c ].m_pReplacementString;
}
int CUtlCharConversion::GetConversionLength( char c ) const
{
return m_pReplacements[ (unsigned char)c ].m_nLength;
}
int CUtlCharConversion::MaxConversionLength() const
{
return m_nMaxConversionLength;
}
//-----------------------------------------------------------------------------
// Finds a conversion for the passed-in string, returns length
//-----------------------------------------------------------------------------
char CUtlCharConversion::FindConversion( const char *pString, int *pLength )
{
for ( int i = 0; i < m_nCount; ++i )
{
if ( !V_strcmp( pString, m_pReplacements[ (unsigned char)( m_pList[i] ) ].m_pReplacementString ) )
{
*pLength = m_pReplacements[ (unsigned char)( m_pList[i] ) ].m_nLength;
return m_pList[i];
}
}
*pLength = 0;
return '\0';
}
//-----------------------------------------------------------------------------
// constructors
//-----------------------------------------------------------------------------
CUtlBuffer::CUtlBuffer( int growSize, int initSize, int nFlags ) :
m_Error(0)
{
MEM_ALLOC_CREDIT();
m_Memory.Init( growSize, initSize );
m_Get = 0;
m_Put = 0;
m_nTab = 0;
m_nOffset = 0;
m_Flags = nFlags;
if ( (initSize != 0) && !IsReadOnly() )
{
m_nMaxPut = -1;
AddNullTermination( m_Put );
}
else
{
m_nMaxPut = 0;
}
SetOverflowFuncs( &CUtlBuffer::GetOverflow, &CUtlBuffer::PutOverflow );
}
CUtlBuffer::CUtlBuffer( const void *pBuffer, int nSize, int nFlags ) :
m_Memory( (unsigned char*)pBuffer, nSize ), m_Error(0)
{
Assert( nSize != 0 );
m_Get = 0;
m_Put = 0;
m_nTab = 0;
m_nOffset = 0;
m_Flags = nFlags;
if ( IsReadOnly() )
{
m_nMaxPut = m_Put = nSize;
}
else
{
m_nMaxPut = -1;
AddNullTermination( m_Put );
}
SetOverflowFuncs( &CUtlBuffer::GetOverflow, &CUtlBuffer::PutOverflow );
}
CUtlBuffer::CUtlBuffer( const CUtlBuffer& copyFrom )
: m_Get( copyFrom.m_Get )
, m_Put( copyFrom.m_Put )
, m_Error( copyFrom.m_Error )
, m_Flags( copyFrom.m_Flags )
, m_Reserved( copyFrom.m_Reserved )
#if defined( _GAMECONSOLE )
, pad( copyFrom.pad )
#endif
, m_nTab( copyFrom.m_nTab )
, m_nMaxPut( copyFrom.m_nMaxPut )
, m_nOffset( copyFrom.m_nOffset )
, m_GetOverflowFunc( copyFrom.m_GetOverflowFunc )
, m_PutOverflowFunc( copyFrom.m_PutOverflowFunc )
, m_Byteswap( copyFrom.m_Byteswap )
{
if(copyFrom.m_Memory.Count() > 0)
{
Assert( false ); // This is a slow path, don't do this.
// copy memory
m_Memory.EnsureCapacity( copyFrom.m_Memory.Count() );
memcpy( m_Memory.Base(), copyFrom.m_Memory.Base(), copyFrom.m_Memory.Count() );
}
}
CUtlBuffer& CUtlBuffer::operator=( const CUtlBuffer& copyFrom )
{
if ( copyFrom.m_Memory.Count() > 0 )
{
Assert( false ); // This is a slow path, don't do this.
if(this != ©From)
{
m_Memory.Purge();
m_Memory.EnsureCapacity( copyFrom.m_Memory.Count() );
memcpy( m_Memory.Base(), copyFrom.m_Memory.Base(), copyFrom.m_Memory.Count() );
}
}
m_Get = copyFrom.m_Get;
m_Put = copyFrom.m_Put;
m_Error = copyFrom.m_Error;
m_Flags = copyFrom.m_Flags;
m_Reserved = copyFrom.m_Reserved;
#if defined( _GAMECONSOLE )
pad = copyFrom.pad;
#endif
m_nTab = copyFrom.m_nTab;
m_nMaxPut = copyFrom.m_nMaxPut;
m_nOffset = copyFrom.m_nOffset;
m_GetOverflowFunc = copyFrom.m_GetOverflowFunc;
m_PutOverflowFunc = copyFrom.m_PutOverflowFunc;
m_Byteswap = copyFrom.m_Byteswap;
return *this;
}
#if VALVE_CPP11
CUtlBuffer::CUtlBuffer( CUtlBuffer&& moveFrom ) // = default
: m_Memory( Move( moveFrom.m_Memory ) )
, m_Get( Move( moveFrom.m_Get ) )
, m_Put( Move( moveFrom.m_Put ) )
, m_Error( Move( moveFrom.m_Error ) )
, m_Flags( Move( moveFrom.m_Flags ) )
, m_Reserved( Move( moveFrom.m_Reserved ) )
#if defined( _GAMECONSOLE )
, pad( Move( moveFrom.pad ) )
#endif
, m_nTab( Move( moveFrom.m_nTab ) )
, m_nMaxPut( Move( moveFrom.m_nMaxPut ) )
, m_nOffset( Move( moveFrom.m_nOffset ) )
, m_GetOverflowFunc( Move( moveFrom.m_GetOverflowFunc ) )
, m_PutOverflowFunc( Move( moveFrom.m_PutOverflowFunc ) )
, m_Byteswap( Move( moveFrom.m_Byteswap ) )
{}
CUtlBuffer& CUtlBuffer::operator=( CUtlBuffer&& moveFrom ) // = default
{
m_Memory = Move( moveFrom.m_Memory );
m_Get = Move( moveFrom.m_Get );
m_Put = Move( moveFrom.m_Put );
m_Error = Move( moveFrom.m_Error );
m_Flags = Move( moveFrom.m_Flags );
m_Reserved = Move( moveFrom.m_Reserved );
#if defined( _GAMECONSOLE )
pad = Move( moveFrom.pad );
#endif
m_nTab = Move( moveFrom.m_nTab );
m_nMaxPut = Move( moveFrom.m_nMaxPut );
m_nOffset = Move( moveFrom.m_nOffset );
m_GetOverflowFunc = Move( moveFrom.m_GetOverflowFunc );
m_PutOverflowFunc = Move( moveFrom.m_PutOverflowFunc );
m_Byteswap = Move( moveFrom.m_Byteswap );
return *this;
}
#endif
//-----------------------------------------------------------------------------
// Modifies the buffer to be binary or text; Blows away the buffer and the CONTAINS_CRLF value.
//-----------------------------------------------------------------------------
void CUtlBuffer::SetBufferType( bool bIsText, bool bContainsCRLF )
{
#ifdef _DEBUG
// If the buffer is empty, there is no opportunity for this stuff to fail
if ( TellMaxPut() != 0 )
{
if ( IsText() )
{
if ( bIsText )
{
Assert( ContainsCRLF() == bContainsCRLF );
}
else
{
Assert( ContainsCRLF() );
}
}
else
{
if ( bIsText )
{
Assert( bContainsCRLF );
}
}
}
#endif
if ( bIsText )
{
m_Flags |= TEXT_BUFFER;
}
else
{
m_Flags &= ~TEXT_BUFFER;
}
if ( bContainsCRLF )
{
m_Flags |= CONTAINS_CRLF;
}
else
{
m_Flags &= ~CONTAINS_CRLF;
}
}
//-----------------------------------------------------------------------------
// Attaches the buffer to external memory....
//-----------------------------------------------------------------------------
void CUtlBuffer::SetExternalBuffer( void* pMemory, int nSize, int nInitialPut, int nFlags )
{
m_Memory.SetExternalBuffer( (unsigned char*)pMemory, nSize );
// Reset all indices; we just changed memory
m_Get = 0;
m_Put = nInitialPut;
m_nTab = 0;
m_Error = 0;
m_nOffset = 0;
m_Flags = nFlags;
m_nMaxPut = -1;
AddNullTermination( m_Put );
}
//-----------------------------------------------------------------------------
// Assumes an external buffer but manages its deletion
//-----------------------------------------------------------------------------
void CUtlBuffer::AssumeMemory( void *pMemory, int nSize, int nInitialPut, int nFlags )
{
m_Memory.AssumeMemory( (unsigned char*) pMemory, nSize );
// Reset all indices; we just changed memory
m_Get = 0;
m_Put = nInitialPut;
m_nTab = 0;
m_Error = 0;
m_nOffset = 0;
m_Flags = nFlags;
m_nMaxPut = -1;
AddNullTermination( m_Put );
}
//-----------------------------------------------------------------------------
// Allows the caller to control memory
//-----------------------------------------------------------------------------
void* CUtlBuffer::DetachMemory()
{
// Reset all indices; we just changed memory
m_Get = 0;
m_Put = 0;
m_nTab = 0;
m_Error = 0;
m_nOffset = 0;
return m_Memory.DetachMemory( );
}
//-----------------------------------------------------------------------------
// Makes sure we've got at least this much memory
//-----------------------------------------------------------------------------
void CUtlBuffer::EnsureCapacity( int num )
{
MEM_ALLOC_CREDIT();
// Add one extra for the null termination
num += 1;
if ( m_Memory.IsExternallyAllocated() )
{
if ( IsGrowable() && ( m_Memory.NumAllocated() < num ) )
{
m_Memory.ConvertToGrowableMemory( 0 );
}
else
{
num -= 1;
}
}
m_Memory.EnsureCapacity( num );
}
//-----------------------------------------------------------------------------
// Base get method from which all others derive
//-----------------------------------------------------------------------------
bool CUtlBuffer::Get( void* pMem, int size )
{
if ( size > 0 && CheckGet( size ) )
{
memcpy( pMem, &m_Memory[m_Get - m_nOffset], size );
m_Get += size;
return true;
}
return false;
}
//-----------------------------------------------------------------------------
// This will get at least 1 byte and up to nSize bytes.
// It will return the number of bytes actually read.
//-----------------------------------------------------------------------------
int CUtlBuffer::GetUpTo( void *pMem, int nSize )
{
if ( CheckArbitraryPeekGet( 0, nSize ) )
{
memcpy( pMem, &m_Memory[m_Get - m_nOffset], nSize );
m_Get += nSize;
return nSize;
}
return 0;
}
//-----------------------------------------------------------------------------
// Eats whitespace
//-----------------------------------------------------------------------------
void CUtlBuffer::EatWhiteSpace()
{
if ( IsText() && IsValid() )
{
while ( CheckGet( sizeof(char) ) )
{
if ( !V_isspace( *(const unsigned char*)PeekGet() ) )
break;
m_Get += sizeof(char);
}
}
}
//-----------------------------------------------------------------------------
// Eats C++ style comments
//-----------------------------------------------------------------------------
bool CUtlBuffer::EatCPPComment()
{
if ( IsText() && IsValid() )
{
// If we don't have a a c++ style comment next, we're done
const char *pPeek = (const char *)PeekGet( 2 * sizeof(char), 0 );
if ( !pPeek || ( pPeek[0] != '/' ) || ( pPeek[1] != '/' ) )
return false;
// Deal with c++ style comments
m_Get += 2;
// read complete line
for ( char c = GetChar(); IsValid(); c = GetChar() )
{
if ( c == '\n' )
break;
}
return true;
}
return false;
}
//-----------------------------------------------------------------------------
// Peeks how much whitespace to eat
//-----------------------------------------------------------------------------
int CUtlBuffer::PeekWhiteSpace( int nOffset )
{
if ( !IsText() || !IsValid() )
return 0;
while ( CheckPeekGet( nOffset, sizeof(char) ) )
{
if ( !V_isspace( *(unsigned char*)PeekGet( nOffset ) ) )
break;
nOffset += sizeof(char);
}
return nOffset;
}
//-----------------------------------------------------------------------------
// Peek size of sting to come, check memory bound
//-----------------------------------------------------------------------------
int CUtlBuffer::PeekStringLength()
{
if ( !IsValid() )
return 0;
// Eat preceeding whitespace
int nOffset = 0;
if ( IsText() )
{
nOffset = PeekWhiteSpace( nOffset );
}
int nStartingOffset = nOffset;
do
{
int nPeekAmount = 128;
// NOTE: Add 1 for the terminating zero!
if ( !CheckArbitraryPeekGet( nOffset, nPeekAmount ) )
{
if ( nOffset == nStartingOffset )
return 0;
return nOffset - nStartingOffset + 1;
}
const char *pTest = (const char *)PeekGet( nOffset );
if ( !IsText() )
{
for ( int i = 0; i < nPeekAmount; ++i )
{
// The +1 here is so we eat the terminating 0
if ( pTest[i] == 0 )
return (i + nOffset - nStartingOffset + 1);
}
}
else
{
for ( int i = 0; i < nPeekAmount; ++i )
{
// The +1 here is so we eat the terminating 0
if ( V_isspace((unsigned char)pTest[i]) || (pTest[i] == 0) )
return (i + nOffset - nStartingOffset + 1);
}
}
nOffset += nPeekAmount;
} while ( true );
}
//-----------------------------------------------------------------------------
// Peek size of line to come, check memory bound
//-----------------------------------------------------------------------------
int CUtlBuffer::PeekLineLength()
{
if ( !IsValid() )
return 0;
int nOffset = 0;
int nStartingOffset = nOffset;
do
{
int nPeekAmount = 128;
// NOTE: Add 1 for the terminating zero!
if ( !CheckArbitraryPeekGet( nOffset, nPeekAmount ) )
{
if ( nOffset == nStartingOffset )
return 0;
return nOffset - nStartingOffset + 1;
}
const char *pTest = (const char *)PeekGet( nOffset );
for ( int i = 0; i < nPeekAmount; ++i )
{
// The +2 here is so we eat the terminating '\n' and 0
if ( pTest[i] == '\n' || pTest[i] == '\r' )
return (i + nOffset - nStartingOffset + 2);
// The +1 here is so we eat the terminating 0
if ( pTest[i] == 0 )
return (i + nOffset - nStartingOffset + 1);
}
nOffset += nPeekAmount;
} while ( true );
}
//-----------------------------------------------------------------------------
// Does the next bytes of the buffer match a pattern?
//-----------------------------------------------------------------------------
bool CUtlBuffer::PeekStringMatch( int nOffset, const char *pString, int nLen )
{
if ( !CheckPeekGet( nOffset, nLen ) )
return false;
return !V_strncmp( (const char*)PeekGet(nOffset), pString, nLen );
}
//-----------------------------------------------------------------------------
// This version of PeekStringLength converts \" to \\ and " to \, etc.
// It also reads a " at the beginning and end of the string
//-----------------------------------------------------------------------------
int CUtlBuffer::PeekDelimitedStringLength( CUtlCharConversion *pConv, bool bActualSize )
{
if ( !IsText() || !pConv )
return PeekStringLength();
// Eat preceeding whitespace
int nOffset = 0;
if ( IsText() )
{
nOffset = PeekWhiteSpace( nOffset );
}
if ( !PeekStringMatch( nOffset, pConv->GetDelimiter(), pConv->GetDelimiterLength() ) )
return 0;
// Try to read ending ", but don't accept \"
int nActualStart = nOffset;
nOffset += pConv->GetDelimiterLength();
int nLen = 1; // Starts at 1 for the '\0' termination
do
{
if ( PeekStringMatch( nOffset, pConv->GetDelimiter(), pConv->GetDelimiterLength() ) )
break;
if ( !CheckPeekGet( nOffset, 1 ) )
break;
char c = *(const char*)PeekGet( nOffset );
++nLen;
++nOffset;
if ( c == pConv->GetEscapeChar() )
{
int nLength = pConv->MaxConversionLength();
if ( !CheckArbitraryPeekGet( nOffset, nLength ) )
break;
pConv->FindConversion( (const char*)PeekGet(nOffset), &nLength );
nOffset += nLength;
}
} while (true);
return bActualSize ? nLen : nOffset - nActualStart + pConv->GetDelimiterLength() + 1;
}
//-----------------------------------------------------------------------------
// Reads a null-terminated string
//-----------------------------------------------------------------------------
void CUtlBuffer::GetString( char* pString, int nMaxChars )
{
if (!IsValid())
{
*pString = 0;
return;
}
Assert( nMaxChars > 0 );
if ( nMaxChars <= 0 )
{
return;
}
// Remember, this *includes* the null character
// It will be 0, however, if the buffer is empty.
int nLen = PeekStringLength();
if ( IsText() )
{
EatWhiteSpace();
}
if ( nLen <= 0 )
{
*pString = 0;
m_Error |= GET_OVERFLOW;
return;
}
const int nCharsToRead = Min( nLen, nMaxChars ) - 1;
Get( pString, nCharsToRead );
pString[ nCharsToRead ] = 0;
if ( nLen > ( nCharsToRead + 1 ) )
{
SeekGet( SEEK_CURRENT, nLen - ( nCharsToRead + 1 ) );
}
// Read the terminating NULL in binary formats
if ( !IsText() )
{
VerifyEquals( GetChar(), 0 );
}
}
//-----------------------------------------------------------------------------
// Reads up to and including the first \n
//-----------------------------------------------------------------------------
void CUtlBuffer::GetLine( char* pLine, int nMaxChars )
{
//Assert( IsText() && !ContainsCRLF() );
if ( !IsValid() )
{
*pLine = 0;
return;
}
if ( nMaxChars == 0 )
{
nMaxChars = INT_MAX;
}
// Remember, this *includes* the null character
// It will be 0, however, if the buffer is empty.
int nLen = PeekLineLength();
if ( nLen == 0 )
{
*pLine = 0;
m_Error |= GET_OVERFLOW;
return;
}
// Strip off the terminating NULL
if ( nLen <= nMaxChars )
{
Get( pLine, nLen - 1 );
pLine[ nLen - 1 ] = 0;
}
else
{
Get( pLine, nMaxChars - 1 );
pLine[ nMaxChars - 1 ] = 0;
SeekGet( SEEK_CURRENT, nLen - 1 - nMaxChars );
}
}
//-----------------------------------------------------------------------------
// This version of GetString converts \ to \\ and " to \", etc.
// It also places " at the beginning and end of the string
//-----------------------------------------------------------------------------
char CUtlBuffer::GetDelimitedCharInternal( CUtlCharConversion *pConv )
{
char c = GetChar();
if ( c == pConv->GetEscapeChar() )
{
int nLength = pConv->MaxConversionLength();
if ( !CheckArbitraryPeekGet( 0, nLength ) )
return '\0';
c = pConv->FindConversion( (const char *)PeekGet(), &nLength );
SeekGet( SEEK_CURRENT, nLength );
}
return c;
}
char CUtlBuffer::GetDelimitedChar( CUtlCharConversion *pConv )
{
if ( !IsText() || !pConv )
return GetChar( );
return GetDelimitedCharInternal( pConv );
}
void CUtlBuffer::GetDelimitedString( CUtlCharConversion *pConv, char *pString, int nMaxChars )
{
if ( !IsText() || !pConv )
{
GetString( pString, nMaxChars );
return;
}
if (!IsValid())
{
*pString = 0;
return;
}
if ( nMaxChars == 0 )
{
nMaxChars = INT_MAX;
}
EatWhiteSpace();
if ( !PeekStringMatch( 0, pConv->GetDelimiter(), pConv->GetDelimiterLength() ) )
return;
// Pull off the starting delimiter
SeekGet( SEEK_CURRENT, pConv->GetDelimiterLength() );
int nRead = 0;
while ( IsValid() )
{
if ( PeekStringMatch( 0, pConv->GetDelimiter(), pConv->GetDelimiterLength() ) )
{
SeekGet( SEEK_CURRENT, pConv->GetDelimiterLength() );
break;
}
char c = GetDelimitedCharInternal( pConv );
if ( nRead < nMaxChars )
{
pString[nRead] = c;
++nRead;
}
}
if ( nRead >= nMaxChars )
{
nRead = nMaxChars - 1;
}
pString[nRead] = '\0';
}
//-----------------------------------------------------------------------------
// Checks if a get is ok
//-----------------------------------------------------------------------------
bool CUtlBuffer::CheckGet( int nSize )
{
if ( m_Error & GET_OVERFLOW )
return false;
if ( TellMaxPut() < m_Get + nSize )
{
m_Error |= GET_OVERFLOW;
return false;
}
if ( ( m_Get < m_nOffset ) || ( m_Memory.NumAllocated() < m_Get - m_nOffset + nSize ) )
{
if ( !OnGetOverflow( nSize ) )
{
m_Error |= GET_OVERFLOW;
return false;
}
}
return true;
}
//-----------------------------------------------------------------------------
// Checks if a peek get is ok
//-----------------------------------------------------------------------------
bool CUtlBuffer::CheckPeekGet( int nOffset, int nSize )
{
if ( m_Error & GET_OVERFLOW )
return false;
// Checking for peek can't set the overflow flag
bool bOk = CheckGet( nOffset + nSize );
m_Error &= ~GET_OVERFLOW;
return bOk;
}
//-----------------------------------------------------------------------------
// Call this to peek arbitrarily long into memory. It doesn't fail unless
// it can't read *anything* new
//-----------------------------------------------------------------------------
bool CUtlBuffer::CheckArbitraryPeekGet( int nOffset, int &nIncrement )
{
if ( TellGet() + nOffset >= TellMaxPut() )
{
nIncrement = 0;
return false;
}
if ( TellGet() + nOffset + nIncrement > TellMaxPut() )
{
nIncrement = TellMaxPut() - TellGet() - nOffset;
}
// NOTE: CheckPeekGet could modify TellMaxPut for streaming files
// We have to call TellMaxPut again here
CheckPeekGet( nOffset, nIncrement );
int nMaxGet = TellMaxPut() - TellGet();
if ( nMaxGet < nIncrement )
{
nIncrement = nMaxGet;
}
return (nIncrement != 0);
}
//-----------------------------------------------------------------------------
// Peek part of the butt
//-----------------------------------------------------------------------------
const void* CUtlBuffer::PeekGet( int nMaxSize, int nOffset )
{
if ( !CheckPeekGet( nOffset, nMaxSize ) )
return NULL;
return &m_Memory[ m_Get + nOffset - m_nOffset ];
}
//-----------------------------------------------------------------------------
// Change where I'm reading
//-----------------------------------------------------------------------------
void CUtlBuffer::SeekGet( SeekType_t type, int offset )
{
switch( type )
{
case SEEK_HEAD:
m_Get = offset;
break;
case SEEK_CURRENT:
m_Get += offset;
break;
case SEEK_TAIL:
m_Get = m_nMaxPut - offset;
break;
}
if ( m_Get > m_nMaxPut )
{
m_Error |= GET_OVERFLOW;
}
else
{
m_Error &= ~GET_OVERFLOW;
if ( m_Get < m_nOffset || m_Get >= m_nOffset + Size() )
{