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/* builder.h */
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <string>
#include <string.h>
#include <stdio.h>
#include <boost/shared_ptr.hpp>
#include "../inline_decls.h"
#include "../stringdata.h"
namespace mongo {
class StringBuilder;
void msgasserted(int msgid, const char *msg);
class BufBuilder {
public:
BufBuilder(int initsize = 512) : size(initsize) {
if ( size > 0 ) {
data = (char *) malloc(size);
if( data == 0 )
msgasserted(10000, "out of memory BufBuilder");
} else {
data = 0;
}
l = 0;
}
~BufBuilder() {
kill();
}
void kill() {
if ( data ) {
free(data);
data = 0;
}
}
void reset( int maxSize = 0 ){
l = 0;
if ( maxSize && size > maxSize ){
free(data);
data = (char*)malloc(maxSize);
size = maxSize;
}
}
/* leave room for some stuff later */
char* skip(int n) { return grow(n); }
/* note this may be deallocated (realloced) if you keep writing. */
char* buf() { return data; }
const char* buf() const { return data; }
/* assume ownership of the buffer - you must then free() it */
void decouple() { data = 0; }
void appendChar(char j){
*((char*)grow(sizeof(char))) = j;
}
void appendNum(char j){
*((char*)grow(sizeof(char))) = j;
}
void appendNum(short j) {
*((short*)grow(sizeof(short))) = j;
}
void appendNum(int j) {
*((int*)grow(sizeof(int))) = j;
}
void appendNum(unsigned j) {
*((unsigned*)grow(sizeof(unsigned))) = j;
}
void appendNum(bool j) {
*((bool*)grow(sizeof(bool))) = j;
}
void appendNum(double j) {
*((double*)grow(sizeof(double))) = j;
}
void appendNum(long long j) {
*((long long*)grow(sizeof(long long))) = j;
}
void appendNum(unsigned long long j) {
*((unsigned long long*)grow(sizeof(unsigned long long))) = j;
}
void appendBuf(const void *src, size_t len) {
memcpy(grow((int) len), src, len);
}
void appendStr(const StringData &str , bool includeEOO = true ) {
const int len = str.size() + ( includeEOO ? 1 : 0 );
memcpy(grow(len), str.data(), len);
}
int len() const {
return l;
}
void setlen( int newLen ){
l = newLen;
}
/* returns the pre-grow write position */
inline char* grow(int by) {
int oldlen = l;
l += by;
if ( l > size ) {
grow_reallocate();
}
return data + oldlen;
}
int getSize() const { return size; }
private:
/* "slow" portion of 'grow()' */
void NOINLINE_DECL grow_reallocate(){
int a = size * 2;
if ( a == 0 )
a = 512;
if ( l > a )
a = l + 16 * 1024;
if( a > 64 * 1024 * 1024 )
msgasserted(10000, "BufBuilder grow() > 64MB");
data = (char *) realloc(data, a);
size= a;
}
char *data;
int l;
int size;
friend class StringBuilder;
};
#if defined(_WIN32)
#pragma warning( disable : 4996 )
#endif
class StringBuilder {
public:
StringBuilder( int initsize=256 )
: _buf( initsize ){
}
#define SBNUM(val,maxSize,macro) \
int prev = _buf.l; \
int z = sprintf( _buf.grow(maxSize) , macro , (val) ); \
_buf.l = prev + z; \
return *this;
StringBuilder& operator<<( double x ){
SBNUM( x , 25 , "%g" );
}
StringBuilder& operator<<( int x ){
SBNUM( x , 11 , "%d" );
}
StringBuilder& operator<<( unsigned x ){
SBNUM( x , 11 , "%u" );
}
StringBuilder& operator<<( long x ){
SBNUM( x , 22 , "%ld" );
}
StringBuilder& operator<<( unsigned long x ){
SBNUM( x , 22 , "%lu" );
}
StringBuilder& operator<<( long long x ){
SBNUM( x , 22 , "%lld" );
}
StringBuilder& operator<<( unsigned long long x ){
SBNUM( x , 22 , "%llu" );
}
StringBuilder& operator<<( short x ){
SBNUM( x , 8 , "%hd" );
}
StringBuilder& operator<<( char c ){
_buf.grow( 1 )[0] = c;
return *this;
}
#undef SBNUM
void write( const char* buf, int len){
memcpy( _buf.grow( len ) , buf , len );
}
void append( const StringData& str ){
memcpy( _buf.grow( str.size() ) , str.data() , str.size() );
}
StringBuilder& operator<<( const StringData& str ){
append( str );
return *this;
}
// access
void reset( int maxSize = 0 ){
_buf.reset( maxSize );
}
std::string str(){
return std::string(_buf.data, _buf.l);
}
private:
BufBuilder _buf;
};
} // namespace mongo
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