/*
  ==============================================================================

   This file is part of the juce_core module of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.

   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 THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
   TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
   NO EVENT SHALL THE AUTHOR 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.

   ------------------------------------------------------------------------------

   NOTE! This permissive ISC license applies ONLY to files within the juce_core module!
   All other JUCE modules are covered by a dual GPL/commercial license, so if you are
   using any other modules, be sure to check that you also comply with their license.

   For more details, visit www.juce.com

  ==============================================================================
*/

MemoryOutputStream::MemoryOutputStream (const size_t initialSize)
  : blockToUse (&internalBlock), externalData (nullptr),
    position (0), size (0), availableSize (0)
{
    internalBlock.setSize (initialSize, false);
}

MemoryOutputStream::MemoryOutputStream (MemoryBlock& memoryBlockToWriteTo,
                                        const bool appendToExistingBlockContent)
  : blockToUse (&memoryBlockToWriteTo), externalData (nullptr),
    position (0), size (0), availableSize (0)
{
    if (appendToExistingBlockContent)
        position = size = memoryBlockToWriteTo.getSize();
}

MemoryOutputStream::MemoryOutputStream (void* destBuffer, size_t destBufferSize)
  : blockToUse (nullptr), externalData (destBuffer),
    position (0), size (0), availableSize (destBufferSize)
{
    jassert (externalData != nullptr); // This must be a valid pointer.
}

MemoryOutputStream::~MemoryOutputStream()
{
    trimExternalBlockSize();
}

void MemoryOutputStream::flush()
{
    trimExternalBlockSize();
}

void MemoryOutputStream::trimExternalBlockSize()
{
    if (blockToUse != &internalBlock && blockToUse != nullptr)
        blockToUse->setSize (size, false);
}

void MemoryOutputStream::preallocate (const size_t bytesToPreallocate)
{
    if (blockToUse != nullptr)
        blockToUse->ensureSize (bytesToPreallocate + 1);
}

void MemoryOutputStream::reset() noexcept
{
    position = 0;
    size = 0;
}

char* MemoryOutputStream::prepareToWrite (size_t numBytes)
{
    jassert ((ssize_t) numBytes >= 0);
    size_t storageNeeded = position + numBytes;

    char* data;

    if (blockToUse != nullptr)
    {
        if (storageNeeded >= blockToUse->getSize())
            blockToUse->ensureSize ((storageNeeded + jmin (storageNeeded / 2, (size_t) (1024 * 1024)) + 32) & ~31u);

        data = static_cast<char*> (blockToUse->getData());
    }
    else
    {
        if (storageNeeded > availableSize)
            return nullptr;

        data = static_cast<char*> (externalData);
    }

    char* const writePointer = data + position;
    position += numBytes;
    size = jmax (size, position);
    return writePointer;
}

bool MemoryOutputStream::write (const void* const buffer, size_t howMany)
{
    jassert (buffer != nullptr);

    if (howMany == 0)
        return true;

    if (char* dest = prepareToWrite (howMany))
    {
        memcpy (dest, buffer, howMany);
        return true;
    }

    return false;
}

bool MemoryOutputStream::writeRepeatedByte (uint8 byte, size_t howMany)
{
    if (howMany == 0)
        return true;

    if (char* dest = prepareToWrite (howMany))
    {
        memset (dest, byte, howMany);
        return true;
    }

    return false;
}

bool MemoryOutputStream::appendUTF8Char (juce_wchar c)
{
    if (char* dest = prepareToWrite (CharPointer_UTF8::getBytesRequiredFor (c)))
    {
        CharPointer_UTF8 (dest).write (c);
        return true;
    }

    return false;
}

MemoryBlock MemoryOutputStream::getMemoryBlock() const
{
    return MemoryBlock (getData(), getDataSize());
}

const void* MemoryOutputStream::getData() const noexcept
{
    if (blockToUse == nullptr)
        return externalData;

    if (blockToUse->getSize() > size)
        static_cast<char*> (blockToUse->getData()) [size] = 0;

    return blockToUse->getData();
}

bool MemoryOutputStream::setPosition (int64 newPosition)
{
    if (newPosition <= (int64) size)
    {
        // ok to seek backwards
        position = jlimit ((size_t) 0, size, (size_t) newPosition);
        return true;
    }

    // can't move beyond the end of the stream..
    return false;
}

int64 MemoryOutputStream::writeFromInputStream (InputStream& source, int64 maxNumBytesToWrite)
{
    // before writing from an input, see if we can preallocate to make it more efficient..
    int64 availableData = source.getTotalLength() - source.getPosition();

    if (availableData > 0)
    {
        if (maxNumBytesToWrite > availableData || maxNumBytesToWrite < 0)
            maxNumBytesToWrite = availableData;

        if (blockToUse != nullptr)
            preallocate (blockToUse->getSize() + (size_t) maxNumBytesToWrite);
    }

    return OutputStream::writeFromInputStream (source, maxNumBytesToWrite);
}

String MemoryOutputStream::toUTF8() const
{
    const char* const d = static_cast<const char*> (getData());
    return String (CharPointer_UTF8 (d), CharPointer_UTF8 (d + getDataSize()));
}

String MemoryOutputStream::toString() const
{
    return String::createStringFromData (getData(), (int) getDataSize());
}

OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const MemoryOutputStream& streamToRead)
{
    const size_t dataSize = streamToRead.getDataSize();

    if (dataSize > 0)
        stream.write (streamToRead.getData(), dataSize);

    return stream;
}
