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#ifndef _bufferstore_h
#define _bufferstore_h
#include "bool.h"
class ostream;
/**
* A generic container for an array of bytes.
*
* bufferStore provides an array of bytes which
* can be accessed using various types.
*/
class bufferStore {
public:
/**
* Constructs a new bufferStore.
*/
bufferStore();
/**
* Constructs a new bufferStore and
* initializes its content.
*
* @param buf Pointer to data for initialization.
* @param len Length of data for initialization.
*/
bufferStore(const unsigned char *, long);
/**
* Destroys a bufferStore instance.
*/
~bufferStore();
/**
* Constructs a new bufferStore and
* initializes its content.
*
* @param b A bufferStore, whose content is
* used for initialization.
*/
bufferStore(const bufferStore &);
/**
* Copies a bufferStore.
*/
bufferStore &operator =(const bufferStore &);
/**
* Retrieves the length of a bufferStore.
*
* @returns The current length of the contents
* in bytes.
*/
unsigned long getLen() const;
/**
* Retrieves the byte at index <em>pos</em>.
*
* @param pos The index of the byte to retrieve.
*
* @returns The value of the byte at index <em>pos</em>
*/
unsigned char getByte(long pos = 0) const;
/**
* Retrieves the word at index <em>pos</em>.
*
* @param pos The index of the word to retrieve.
*
* @returns The value of the word at index <em>pos</em>
*/
unsigned int getWord(long pos = 0) const;
/**
* Retrieves the dword at index <em>pos</em>.
*
* @param pos The index of the dword to retrieve.
*
* @returns The value of the dword at index <em>pos</em>
*/
unsigned int getDWord(long pos = 0) const;
/**
* Retrieves the characters at index <em>pos</em>.
*
* @param pos The index of the characters to retrieve.
*
* @returns A pointer to characters at index <em>pos</em>
*/
const char * getString(long pos = 0) const;
/**
* Removes bytes from the start of the buffer.
*
* @param len Number of bytes to remove.
*/
void discardFirstBytes(int len = 0);
/**
* Prints a dump of the content.
*
* Mainly used for debugging purposes.
*
* @param s The stream to write to.
* @param b The bufferStore do be dumped.
*
* @returns The stream.
*/
friend ostream &operator<<(ostream &, const bufferStore &);
/**
* Tests if the bufferStore is empty.
*
* @returns true, if the bufferStore is empty.
* false, if it contains data.
*/
bool empty() const;
/**
* Initializes the bufferStore.
*
* All data is removed, the length is
* reset to 0.
*/
void init();
/**
* Initializes the bufferStore with
* a given data.
*
* @param buf Pointer to data to initialize from.
* @param len Length of data.
*/
void init(const unsigned char * buf, long len);
/**
* Appends a byte to the content of this instance.
*
* @param c The byte to append.
*/
void addByte(unsigned char c);
/**
* Appends a word to the content of this instance.
*
* @param w The word to append.
*/
void addWord(int);
/**
* Appends a dword to the content of this instance.
*
* @param dw The dword to append.
*/
void addDWord(long dw);
/**
* Appends a string to the content of this instance.
*
* The trailing zero byte is <em>not</em> copied
* to the content.
*
* @param s The string to append.
*/
void addString(const char *s);
/**
* Appends a string to the content of this instance.
*
* The trailing zero byte <em>is</em> copied
* to the content.
*
* @param s The string to append.
*/
void addStringT(const char *s);
/**
* Appends data to the content of this instance.
*
* @param buf The data to append.
* @param len Length of data.
*/
void addBytes(const unsigned char *buf, int len);
/**
* Appends data to the content of this instance.
*
* @param b The bufferStore whose content to append.
* @param maxLen Length of content.
*/
void addBuff(const bufferStore &b, long maxLen = -1);
/**
* Truncates the buffer.
* If the buffer is smaller, does nothing.
*
* @param newLen The new length of the buffer.
*/
void truncate(long newLen);
private:
void checkAllocd(long newLen);
long len;
long lenAllocd;
long start;
unsigned char * buff;
enum c { MIN_LEN = 300 };
};
inline bool bufferStore::empty() const {
return (len-start) == 0;
}
#endif
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