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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Read_Buffer.h
//
// = AUTHOR
// Doug Schmidt and Seth Widoff
//
// ============================================================================
#ifndef ACE_READ_BUFFER_H
#define ACE_READ_BUFFER_H
#include "ace/pre.h"
#include "ace/ACE.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Malloc.h"
class ACE_Export ACE_Read_Buffer
{
// = TITLE
// Efficiently reads an artibrarily large buffer from an input
// stream up to and including a termination character. Also
// performs search/replace on single occurrences a character in
// the buffer using the principles of Integrated Layer
// Processing.
//
// = DESCRIPTION
// This implementation is optimized to do a single dynamic
// allocation and make only one copy of the data. It uses
// recursion and the run-time stack to accomplish this
// efficiently.
public:
// = Initialization and termination methods.
ACE_Read_Buffer (FILE *fp,
int close_on_delete = 0,
ACE_Allocator * = 0);
// Read from a FILE *.
ACE_Read_Buffer (ACE_HANDLE handle,
int close_on_delete = 0,
ACE_Allocator * = 0);
// Read from an open HANDLE.
~ACE_Read_Buffer (void);
// Closes the FILE *.
char *read (int terminator = EOF,
int search = '\n',
int replace = '\0');
// Returns a pointer dynamically allocated with
// <ACE_Allocator::malloc> to data from the input stream up to (and
// including) the <terminator>. If <search> is >= 0 then all
// occurrences of the <search> value are substituted with the
// <replace> value. The last of the byte of data is a 0, so that
// <strlen> can be used on it. The caller is responsible for
// freeing the pointer returned from this method using the
// <ACE_Allocator::free>.
size_t replaced (void) const;
// Returns the number of characters replaced during a <read>.
size_t size (void) const;
// Returns the size of the allocated buffer obtained during a
// <read>, not including the null terminator.
ACE_Allocator *alloc (void) const;
// Returns a pointer to its allocator.
void dump (void) const;
// Dump the state of the object.
private:
char *rec_read (int term, int search, int replace);
// Recursive helper method that does the work...
size_t size_;
// The total number of characters in the buffer.
size_t occurrences_;
// The total number of characters replaced.
FILE *stream_;
// The stream we are reading from.
int close_on_delete_;
// Keeps track of whether we should close the FILE in the
// destructor.
ACE_Allocator *allocator_;
// Pointer to the allocator.
// = Disallow copying and assignment...
ACE_UNIMPLEMENTED_FUNC (void operator= (const ACE_Read_Buffer &))
ACE_UNIMPLEMENTED_FUNC (ACE_Read_Buffer (const ACE_Read_Buffer &))
};
#if defined (__ACE_INLINE__)
# include "ace/Read_Buffer.i"
#endif /* __ACE_INLINE__ */
#include "ace/post.h"
#endif /* ACE_READ_BUFFER_H */
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