MemoryInputStream.cpp

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/*
  ==============================================================================
 
   This file is part of the Water library.
   Copyright (c) 2016 - ROLI Ltd.
   Copyright (C) 2021 Filipe Coelho <falktx@falktx.com>
 
   Permission is granted to use this software under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license/
 
   Permission to use, copy, modify, and/or distribute this software for any
   purpose with or without fee is hereby granted, provided that the above
   copyright notice and this permission notice appear in all copies.
 
   THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH REGARD
   TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
   FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
   OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
   USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
   TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
   OF THIS SOFTWARE.
 
  ==============================================================================
*/
 
#include "MemoryInputStream.h"
 
namespace water {
 
MemoryInputStream::MemoryInputStream (const void* const sourceData,
                                      const size_t sourceDataSize,
                                      const bool keepInternalCopy)
    : data (sourceData),
      dataSize (sourceDataSize),
      position (0)
{
    if (keepInternalCopy)
        createInternalCopy();
}
 
MemoryInputStream::MemoryInputStream (const MemoryBlock& sourceData,
                                      const bool keepInternalCopy)
    : data (sourceData.getData()),
      dataSize (sourceData.getSize()),
      position (0)
{
    if (keepInternalCopy)
        createInternalCopy();
}
 
void MemoryInputStream::createInternalCopy()
{
    internalCopy.malloc (dataSize);
    memcpy (internalCopy, data, dataSize);
    data = internalCopy;
}
 
MemoryInputStream::~MemoryInputStream()
{
}
 
int64 MemoryInputStream::getTotalLength()
{
    return (int64) dataSize;
}
 
int MemoryInputStream::read (void* const buffer, const int howMany)
{
    wassert (buffer != nullptr && howMany >= 0);
 
    if (howMany <= 0 || position >= dataSize)
        return 0;
 
    const size_t num = jmin ((size_t) howMany, dataSize - position);
 
    if (num > 0)
    {
        memcpy (buffer, addBytesToPointer (data, position), num);
        position += num;
    }
 
    return (int) num;
}
 
bool MemoryInputStream::isExhausted()
{
    return position >= dataSize;
}
 
bool MemoryInputStream::setPosition (const int64 pos)
{
    position = (size_t) jlimit ((int64) 0, (int64) dataSize, pos);
    return true;
}
 
int64 MemoryInputStream::getPosition()
{
    return (int64) position;
}
 
 
//==============================================================================
#if WATER_UNIT_TESTS
 
class MemoryStreamTests  : public UnitTest
{
public:
    MemoryStreamTests() : UnitTest ("MemoryInputStream & MemoryOutputStream") {}
 
    void runTest() override
    {
        beginTest ("Basics");
        Random r = getRandom();
 
        int randomInt = r.nextInt();
        int64 randomInt64 = r.nextInt64();
        double randomDouble = r.nextDouble();
        String randomString (createRandomWideCharString (r));
 
        MemoryOutputStream mo;
        mo.writeInt (randomInt);
        mo.writeIntBigEndian (randomInt);
        mo.writeCompressedInt (randomInt);
        mo.writeString (randomString);
        mo.writeInt64 (randomInt64);
        mo.writeInt64BigEndian (randomInt64);
        mo.writeDouble (randomDouble);
        mo.writeDoubleBigEndian (randomDouble);
 
        MemoryInputStream mi (mo.getData(), mo.getDataSize(), false);
        expect (mi.readInt() == randomInt);
        expect (mi.readIntBigEndian() == randomInt);
        expect (mi.readCompressedInt() == randomInt);
        expectEquals (mi.readString(), randomString);
        expect (mi.readInt64() == randomInt64);
        expect (mi.readInt64BigEndian() == randomInt64);
        expect (mi.readDouble() == randomDouble);
        expect (mi.readDoubleBigEndian() == randomDouble);
    }
 
    static String createRandomWideCharString (Random& r)
    {
        water_wchar buffer [50] = { 0 };
 
        for (int i = 0; i < numElementsInArray (buffer) - 1; ++i)
        {
            if (r.nextBool())
            {
                do
                {
                    buffer[i] = (water_wchar) (1 + r.nextInt (0x10ffff - 1));
                }
                while (! CharPointer_UTF16::canRepresent (buffer[i]));
            }
            else
                buffer[i] = (water_wchar) (1 + r.nextInt (0xff));
        }
 
        return CharPointer_UTF32 (buffer);
    }
};
 
static MemoryStreamTests memoryInputStreamUnitTests;
 
#endif
 
}