InputStream.cpp

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/*
  ==============================================================================
 
   This file is part of the Water library.
   Copyright (c) 2016 ROLI Ltd.
   Copyright (C) 2017-2018 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 "InputStream.h"
#include "../memory/ByteOrder.h"
#include "../streams/MemoryOutputStream.h"
 
namespace water {
 
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()
{
    char temp[4];
 
    if (read (temp, 4) == 4)
        return (int) ByteOrder::littleEndianInt (temp);
 
    return 0;
}
 
int InputStream::readIntBigEndian()
{
    char temp[4];
 
    if (read (temp, 4) == 4)
        return (int) 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)
    {
        wassertfalse;    // 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...
#ifdef CARLA_PROPER_CPP11_SUPPORT
    static_wassert (sizeof (int32) == sizeof (float));
#endif
    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::fromUTF8 (data, (int) 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);
}
 
size_t InputStream::readIntoMemoryBlock (MemoryBlock& block, ssize_t numBytes)
{
    MemoryOutputStream mo (block, true);
    return (size_t) 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) jmin (numBytesToSkip, (int64) 16384);
        HeapBlock<char> temp;
        temp.malloc((size_t) skipBufferSize); // another FIXME
 
        while (numBytesToSkip > 0 && ! isExhausted())
            numBytesToSkip -= read (temp, (int) jmin (numBytesToSkip, (int64) skipBufferSize));
    }
}
 
}