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/*
* palm-db-tools: Encapsulate "blocks" of data.
* Copyright (C) 2000 by Tom Dyas (tdyas@users.sourceforge.net)
*
* The PalmLib::Block class represents a generic block of data. It is
* used to make passing pi_char_t buffers around very easy. The Record
* and Resource classes both inherit from this class. A STL interface
* is also attempted though it is probably not complete.
*/
#ifndef __PALMLIB_BLOCK_H__
#define __PALMLIB_BLOCK_H__
#include <cstddef>
#include <algorithm>
#include <iterator>
#include "palmtypes.h"
namespace PalmLib {
class Block {
public:
// STL: container type definitions
typedef PalmLib::pi_char_t value_type;
typedef value_type* pointer;
typedef const value_type* const_pointer;
typedef value_type* iterator;
typedef const value_type* const_iterator;
typedef value_type& reference;
typedef const value_type& const_reference;
typedef size_t size_type;
typedef ptrdiff_t difference_type;
// STL: reverisible container type definitions
#ifdef __GNUG__
typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
typedef std::reverse_iterator<iterator> reverse_iterator;
#endif
/**
* Default constructor.
*/
Block() : m_data(0), m_size(0) { }
/**
* Constructor which fills the block from buffer "raw" with
* length "len".
*/
Block(const_pointer raw, const size_type len) : m_data(0), m_size(0) {
assign(raw, len);
}
/**
* Constructor which takes a size and allocates a zero'ed out
* buffer of that size. (STL: Sequence: default fill
* constructor)
*/
Block(const size_type size, const value_type value = 0)
: m_data(0), m_size(0) {
assign(size, value);
}
/**
* Constructor which takes two iterators and builds the block
* from the region between the iterators. (STL: Sequence:
* range constructor)
*/
Block(const_iterator a, const_iterator b) : m_data(0), m_size(0) {
assign(a, b - a);
}
/**
* Copy constructor. Just copies the data from the other block
* into this block.
*/
Block(const Block& rhs) : m_data(0), m_size(0) {
assign(rhs.data(), rhs.size());
}
/**
* Destructor. Just frees the buffer if it exists.
*/
virtual ~Block() { clear(); }
/**
* Assignment operator.
*
* @param rhs The block whose contents should be copied.
*/
Block& operator = (const Block& rhs) {
assign(rhs.data(), rhs.size());
return *this;
}
// STL: Container
iterator begin() { return m_data; }
const_iterator begin() const { return m_data; }
iterator end() { return (m_data != 0) ? (m_data + m_size) : (0); }
const_iterator end() const
{ return (m_data != 0) ? (m_data + m_size) : (0); }
size_type size() const { return m_size; }
size_type max_size() const {
return size_type(-1) / sizeof(value_type);
}
bool empty() const { return m_size == 0; }
// STL: Reversible Container
#ifdef __GNUG__
reverse_iterator rbegin() { return reverse_iterator(end()); }
const_reverse_iterator rbegin() const {
return const_reverse_iterator(end());
}
reverse_iterator rend() { return reverse_iterator(begin()); }
const_reverse_iterator rend() const {
return const_reverse_iterator(begin());
}
#endif
// STL: Random Access Container
reference operator [] (size_type index) { return m_data[index]; }
const_reference operator [] (size_type index) const
{ return m_data[index]; }
// STL: Sequence (not complete)
void clear() {
if (m_data) {
delete [] m_data;
m_data = 0;
m_size = 0;
}
}
void resize(size_type n);
reference front() { return m_data[0]; }
const_reference front() const { return m_data[0]; }
// STL: (present in vector but not part of a interface spec)
size_type capacity() const { return m_size; }
void reserve(size_type size);
/**
* Return a pointer to the data area. If there are no
* contents, then the return value will be NULL. This is not
* an STL method but goes with this class as a singular data
* block and not a container (even though it is).
*/
iterator data() { return m_data; }
const_iterator data() const { return m_data; }
/**
* Replace the existing contents of the Block with the buffer
* that starts at raw of size len.
*
* @param raw Pointer to the new contents.
* @param len Size of the new contents.
*/
void assign(const_pointer data, const size_type size);
/**
* Replace the existing contents of the Block with a buffer
* consisting of size elements equal to fill.
*
* @param size The size of the new contents.
* @param value Value to fill the contents with.
*/
void assign(const size_type size, const value_type value = 0);
// compatiblity functions (remove before final 0.3.0 release)
const_pointer raw_data() const { return data(); }
pointer raw_data() { return data(); }
size_type raw_size() const { return size(); }
void set_raw(const_pointer raw, const size_type len)
{ assign(raw, len); }
private:
pointer m_data;
size_type m_size;
};
}
bool operator == (const PalmLib::Block& lhs, const PalmLib::Block& rhs);
inline bool operator != (const PalmLib::Block& lhs, const PalmLib::Block& rhs)
{ return ! (lhs == rhs); }
#endif
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