/*
 *
 * Copyright (c) 2006 The Apache Software Foundation
 *
 * 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.
 *
 */
#include "Buffer.h"

qpid::framing::Buffer::Buffer(int _size) : size(_size), position(0), limit(_size){
    data = new char[size];
}

qpid::framing::Buffer::~Buffer(){
    delete[] data;
}

void qpid::framing::Buffer::flip(){
    limit = position;
    position = 0;
}

void qpid::framing::Buffer::clear(){
    limit = size;
    position = 0;
}

void qpid::framing::Buffer::compact(){
    int p = limit - position;
    //copy p chars from position to 0
    memmove(data, data + position, p);
    limit = size;
    position = p;
}

void qpid::framing::Buffer::record(){
    r_position = position;
    r_limit = limit;
}

void qpid::framing::Buffer::restore(){
    position = r_position;
    limit = r_limit;
}

int qpid::framing::Buffer::available(){
    return limit - position;
}

char* qpid::framing::Buffer::start(){
    return data + position;
}

void qpid::framing::Buffer::move(int bytes){
    position += bytes;
}
    
void qpid::framing::Buffer::putOctet(u_int8_t i){
    data[position++] = i;
}

void qpid::framing::Buffer::putShort(u_int16_t i){
    u_int16_t b = i;
    data[position++] = (u_int8_t) (0xFF & (b >> 8));
    data[position++] = (u_int8_t) (0xFF & b);
}

void qpid::framing::Buffer::putLong(u_int32_t i){
    u_int32_t b = i;
    data[position++] = (u_int8_t) (0xFF & (b >> 24));
    data[position++] = (u_int8_t) (0xFF & (b >> 16));
    data[position++] = (u_int8_t) (0xFF & (b >> 8));
    data[position++] = (u_int8_t) (0xFF & b);
}

void qpid::framing::Buffer::putLongLong(u_int64_t i){
    u_int32_t hi = i >> 32;
    u_int32_t lo = i;
    putLong(hi);
    putLong(lo);
}

u_int8_t qpid::framing::Buffer::getOctet(){ 
    return (u_int8_t) data[position++]; 
}

u_int16_t qpid::framing::Buffer::getShort(){ 
    u_int16_t hi = (unsigned char) data[position++];
    hi = hi << 8;
    hi |= (unsigned char) data[position++];
    return hi;
}

u_int32_t qpid::framing::Buffer::getLong(){ 
    u_int32_t a = (unsigned char) data[position++];
    u_int32_t b = (unsigned char) data[position++];
    u_int32_t c = (unsigned char) data[position++];
    u_int32_t d = (unsigned char) data[position++];
    a = a << 24;
    a |= b << 16;
    a |= c << 8;
    a |= d;
    return a;
}

u_int64_t qpid::framing::Buffer::getLongLong(){
    u_int64_t hi = getLong();
    u_int64_t lo = getLong();
    hi = hi << 32;
    return hi | lo;
}


void qpid::framing::Buffer::putShortString(const string& s){
    u_int8_t size = s.length();
    putOctet(size);
    s.copy(data + position, size);
    position += size;    
}

void qpid::framing::Buffer::putLongString(const string& s){
    u_int32_t size = s.length();
    putLong(size);
    s.copy(data + position, size);
    position += size;    
}

void qpid::framing::Buffer::getShortString(string& s){
    u_int8_t size = getOctet();
    s.assign(data + position, size);
    position += size;
}

void qpid::framing::Buffer::getLongString(string& s){
    u_int32_t size = getLong();
    s.assign(data + position, size);
    position += size;
}

void qpid::framing::Buffer::putFieldTable(const FieldTable& t){
    t.encode(*this);
}

void qpid::framing::Buffer::getFieldTable(FieldTable& t){
    t.decode(*this);
}

void qpid::framing::Buffer::putRawData(const string& s){
    u_int32_t size = s.length();
    s.copy(data + position, size);
    position += size;    
}

void qpid::framing::Buffer::getRawData(string& s, u_int32_t size){
    s.assign(data + position, size);
    position += size;
}
