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 /*
  *  This file is part of the KDE libraries
  *  Copyright (C) 2013 Bernd Buschinski <b.buschinski@googlemail.com>
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public
  *  License along with this library; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #include "ecma/kjs_arraybuffer.h"
 
 #include <kjs/operations.h>
 
 #include "kjs_arraybuffer.lut.h"
 
 namespace KJS
 {
 
 ArrayBufferConstructorImp::ArrayBufferConstructorImp(ExecState *exec, DOM::DocumentImpl *d)
     : JSObject(exec->lexicalInterpreter()->builtinObjectPrototype()), doc(d)
 {
 }
 
 bool ArrayBufferConstructorImp::implementsConstruct() const
 {
     return true;
 }
 
 JSObject *ArrayBufferConstructorImp::construct(ExecState * /*exec*/, const List &args)
 {
     double sizeF = 0.0;
     size_t size = 0;
     if (args[0]->getNumber(sizeF)) {
         if (!KJS::isNaN(sizeF) && !KJS::isInf(sizeF) && sizeF > 0) {
             size = static_cast<size_t>(sizeF);
         }
     }
 
     return new ArrayBuffer(size);
 }
 
 /* Source for ArrayBufferProtoTable.
 
 @begin ArrayBufferProtoTable 1
     splice  ArrayBuffer::Splice     Function|DontDelete     1
 @end
 
 */
 
 KJS_DEFINE_PROTOTYPE(ArrayBufferProto)
 KJS_IMPLEMENT_PROTOFUNC(ArrayBufferProtoFunc)
 KJS_IMPLEMENT_PROTOTYPE("ArrayBuffer", ArrayBufferProto, ArrayBufferProtoFunc, ObjectPrototype)
 
 const ClassInfo ArrayBuffer::info = { "ArrayBuffer", nullptr, &ArrayBufferTable, nullptr };
 
 /* Source for ArrayBufferTable.
 
 @begin ArrayBufferTable 1
     byteLength  ArrayBuffer::ByteLength     ReadOnly|DontDelete
 @end
 
 */
 
 ArrayBuffer::ArrayBuffer(size_t size)
     : JSObject(),
       m_size(size),
       m_buffer(nullptr)
 {
     if (m_size > 0) {
         m_buffer = new uint8_t[m_size];
         memset(m_buffer, 0, m_size);
     }
 }
 
 ArrayBuffer::ArrayBuffer(uint8_t *buffer, size_t size)
     : JSObject(),
       m_size(size),
       m_buffer(nullptr)
 {
     if (m_size > 0) {
         m_buffer = new uint8_t[m_size];
         memcpy(m_buffer, buffer, m_size);
     }
 }
 
 ArrayBuffer::~ArrayBuffer()
 {
     delete[] m_buffer;
 }
 
 bool ArrayBuffer::getOwnPropertySlot(ExecState *exec, const Identifier &propertyName, PropertySlot &slot)
 {
     return getStaticValueSlot<ArrayBuffer, JSObject>(exec, &ArrayBufferTable, this, propertyName, slot);
 }
 
 JSValue *ArrayBuffer::getValueProperty(ExecState * /*exec*/, int token) const
 {
     switch (token) {
     case ByteLength:
         return jsNumber(m_size);
     default:
         return jsUndefined();
     }
 }
 
 // -------------------------- ArrayBufferProtoFunc ----------------------------
 
 JSValue *ArrayBufferProtoFunc::callAsFunction(ExecState *exec, JSObject *thisObj, const List &args)
 {
     if (thisObj->inherits(&ArrayBuffer::info)) {
         return throwError(exec, TypeError);
     }
 
     ArrayBuffer *arraybuf = static_cast<ArrayBuffer *>(thisObj);
     switch (id) {
     case ArrayBuffer::Splice: {
         // Slice takes max long/signed size_t
         // If start or end are negative, it refers to an index from the end of the array
         ssize_t start = 0;
         ssize_t end = 0;
         double tmp;
         if (args[0]->getNumber(tmp)) {
             start = static_cast<ssize_t>(tmp);
         }
         if (args.size() >= 2 && args[1]->getNumber(tmp)) {
             end = static_cast<ssize_t>(tmp);
         }
 
         // turn negative start/end into a valid positive index
         if (start < 0 && arraybuf->byteLength() > static_cast<size_t>(-start)) {
             start = arraybuf->byteLength() + start;
         }
         if (end < 0 && arraybuf->byteLength() > static_cast<size_t>(-end)) {
             end = arraybuf->byteLength() + end;
         }
 
         if (static_cast<size_t>(start) > arraybuf->byteLength()) {
             start = arraybuf->byteLength();
         }
         if (static_cast<size_t>(end) > arraybuf->byteLength()) {
             end = 0;
         }
 
         size_t length = 0;
         if (start < end) {
             length = end - start;
         } else if (args.size() < 2 && start > 0 && arraybuf->byteLength() > static_cast<size_t>(start)) {
             length = arraybuf->byteLength() - start;
         }
 
         ArrayBuffer *ret = new ArrayBuffer(length);
         memcpy(ret->buffer(), arraybuf->buffer() + start, length);
         return ret;
     }
     default:
         return jsUndefined();
     }
 }
 
 } // namespace KJS