//------------------------------------------------------------------------------
/*
    This file is part of Beast: https://github.com/vinniefalco/Beast
    Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>

    Portions of this file are from JUCE.
    Copyright (c) 2013 - Raw Material Software Ltd.
    Please visit http://www.juce.com

    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.
*/
//==============================================================================

int64 InputStream::getNumBytesRemaining()
{
    int64 len = getTotalLength();

    if (len >= 0)
        len -= getPosition();

    return len;
}

char InputStream::readByte()
{
    char temp = 0;
    read (&temp, 1);
    return temp;
}

bool InputStream::readBool()
{
    return readByte() != 0;
}

short InputStream::readShort()
{
    char temp[2];

    if (read (temp, 2) == 2)
        return (short) ByteOrder::littleEndianShort (temp);

    return 0;
}

short InputStream::readShortBigEndian()
{
    char temp[2];

    if (read (temp, 2) == 2)
        return (short) ByteOrder::bigEndianShort (temp);

    return 0;
}

int InputStream::readInt()
{
    static_bassert (sizeof (int) == 4);

    char temp[4];

    if (read (temp, 4) == 4)
        return (int) ByteOrder::littleEndianInt (temp);

    return 0;
}

int32 InputStream::readInt32()
{
    char temp[4];

    if (read (temp, 4) == 4)
        return (int32) ByteOrder::littleEndianInt (temp);

    return 0;
}

int InputStream::readIntBigEndian()
{
    char temp[4];

    if (read (temp, 4) == 4)
        return (int) ByteOrder::bigEndianInt (temp);

    return 0;
}

int32 InputStream::readInt32BigEndian()
{
    char temp[4];

    if (read (temp, 4) == 4)
        return (int32) ByteOrder::bigEndianInt (temp);

    return 0;
}

int InputStream::readCompressedInt()
{
    const uint8 sizeByte = (uint8) readByte();
    if (sizeByte == 0)
        return 0;

    const int numBytes = (sizeByte & 0x7f);
    if (numBytes > 4)
    {
        bassertfalse;    // trying to read corrupt data - this method must only be used
                       // to read data that was written by OutputStream::writeCompressedInt()
        return 0;
    }

    char bytes[4] = { 0, 0, 0, 0 };
    if (read (bytes, numBytes) != numBytes)
        return 0;

    const int num = (int) ByteOrder::littleEndianInt (bytes);
    return (sizeByte >> 7) ? -num : num;
}

int64 InputStream::readInt64()
{
    union { uint8 asBytes[8]; uint64 asInt64; } n;

    if (read (n.asBytes, 8) == 8)
        return (int64) ByteOrder::swapIfBigEndian (n.asInt64);

    return 0;
}

int64 InputStream::readInt64BigEndian()
{
    union { uint8 asBytes[8]; uint64 asInt64; } n;

    if (read (n.asBytes, 8) == 8)
        return (int64) ByteOrder::swapIfLittleEndian (n.asInt64);

    return 0;
}

float InputStream::readFloat()
{
    // the union below relies on these types being the same size...
    static_bassert (sizeof (int32) == sizeof (float));
    union { int32 asInt; float asFloat; } n;
    n.asInt = (int32) readInt();
    return n.asFloat;
}

float InputStream::readFloatBigEndian()
{
    union { int32 asInt; float asFloat; } n;
    n.asInt = (int32) readIntBigEndian();
    return n.asFloat;
}

double InputStream::readDouble()
{
    union { int64 asInt; double asDouble; } n;
    n.asInt = readInt64();
    return n.asDouble;
}

double InputStream::readDoubleBigEndian()
{
    union { int64 asInt; double asDouble; } n;
    n.asInt = readInt64BigEndian();
    return n.asDouble;
}

String InputStream::readString()
{
    MemoryBlock buffer (256);
    char* data = static_cast<char*> (buffer.getData());
    size_t i = 0;

    while ((data[i] = readByte()) != 0)
    {
        if (++i >= buffer.getSize())
        {
            buffer.setSize (buffer.getSize() + 512);
            data = static_cast<char*> (buffer.getData());
        }
    }

    return String (CharPointer_UTF8 (data),
                   CharPointer_UTF8 (data + i));
}

String InputStream::readNextLine()
{
    MemoryBlock buffer (256);
    char* data = static_cast<char*> (buffer.getData());
    size_t i = 0;

    while ((data[i] = readByte()) != 0)
    {
        if (data[i] == '\n')
            break;

        if (data[i] == '\r')
        {
            const int64 lastPos = getPosition();

            if (readByte() != '\n')
                setPosition (lastPos);

            break;
        }

        if (++i >= buffer.getSize())
        {
            buffer.setSize (buffer.getSize() + 512);
            data = static_cast<char*> (buffer.getData());
        }
    }

    return String::fromUTF8 (data, (int) i);
}

int InputStream::readIntoMemoryBlock (MemoryBlock& block, ssize_t numBytes)
{
    MemoryOutputStream mo (block, true);
    return mo.writeFromInputStream (*this, numBytes);
}

String InputStream::readEntireStreamAsString()
{
    MemoryOutputStream mo;
    mo << *this;
    return mo.toString();
}

//==============================================================================
void InputStream::skipNextBytes (int64 numBytesToSkip)
{
    if (numBytesToSkip > 0)
    {
        const int skipBufferSize = (int) bmin (numBytesToSkip, (int64) 16384);
        HeapBlock<char> temp ((size_t) skipBufferSize);

        while (numBytesToSkip > 0 && ! isExhausted())
            numBytesToSkip -= read (temp, (int) bmin (numBytesToSkip, (int64) skipBufferSize));
    }
}

//------------------------------------------------------------------------------

// Unfortunately, putting these in the header causes duplicate
// definition linker errors, even with the inline keyword!

template <>
char InputStream::readType <char> () { return readByte (); }

template <>
short InputStream::readType <short> () { return readShort (); }

template <>
int32 InputStream::readType <int32> () { return readInt32 (); }

template <>
int64 InputStream::readType <int64> () { return readInt64 (); }

template <>
unsigned char InputStream::readType <unsigned char> () { return static_cast <unsigned char> (readByte ()); }

template <>
unsigned short InputStream::readType <unsigned short> () { return static_cast <unsigned short> (readShort ()); }

template <>
uint32 InputStream::readType <uint32> () { return static_cast <uint32> (readInt32 ()); }

template <>
uint64 InputStream::readType <uint64> () { return static_cast <uint64> (readInt64 ()); }

template <>
float InputStream::readType <float> () { return readFloat (); }

template <>
double InputStream::readType <double> () { return readDouble (); }

//------------------------------------------------------------------------------

template <>
char InputStream::readTypeBigEndian <char> () { return readByte (); }

template <>
short InputStream::readTypeBigEndian <short> () { return readShortBigEndian (); }

template <>
int32 InputStream::readTypeBigEndian <int32> () { return readInt32BigEndian (); }

template <>
int64 InputStream::readTypeBigEndian <int64> () { return readInt64BigEndian (); }

template <>
unsigned char InputStream::readTypeBigEndian <unsigned char> () { return static_cast <unsigned char> (readByte ()); }

template <>
unsigned short InputStream::readTypeBigEndian <unsigned short> () { return static_cast <unsigned short> (readShortBigEndian ()); }

template <>
uint32 InputStream::readTypeBigEndian <uint32> () { return static_cast <uint32> (readInt32BigEndian ()); }

template <>
uint64 InputStream::readTypeBigEndian <uint64> () { return static_cast <uint64> (readInt64BigEndian ()); }

template <>
float InputStream::readTypeBigEndian <float> () { return readFloatBigEndian (); }

template <>
double InputStream::readTypeBigEndian <double> () { return readDoubleBigEndian (); }