source/modules/water/streams/MemoryInputStream.cpp

   1 /*
   2   ==============================================================================
   3
   4    This file is part of the Water library.
   5    Copyright (c) 2016 - ROLI Ltd.
   6    Copyright (C) 2021 Filipe Coelho <falktx@falktx.com>
   7
   8    Permission is granted to use this software under the terms of the ISC license
   9    http://www.isc.org/downloads/software-support-policy/isc-license/
  10
  11    Permission to use, copy, modify, and/or distribute this software for any
  12    purpose with or without fee is hereby granted, provided that the above
  13    copyright notice and this permission notice appear in all copies.
  14
  15    THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH REGARD
  16    TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17    FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
  18    OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
  19    USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  20    TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  21    OF THIS SOFTWARE.
  22
  23   ==============================================================================
  24 */
  25
  26 #include "MemoryInputStream.h"
  27
  28 namespace water {
  29
  30 MemoryInputStream::MemoryInputStream (const void* const sourceData,
  31                                       const size_t sourceDataSize,
  32                                       const bool keepInternalCopy)
  33     : data (sourceData),
  34       dataSize (sourceDataSize),
  35       position (0)
  36 {
  37     if (keepInternalCopy)
  38         createInternalCopy();
  39 }
  40
  41 MemoryInputStream::MemoryInputStream (const MemoryBlock& sourceData,
  42                                       const bool keepInternalCopy)
  43     : data (sourceData.getData()),
  44       dataSize (sourceData.getSize()),
  45       position (0)
  46 {
  47     if (keepInternalCopy)
  48         createInternalCopy();
  49 }
  50
  51 void MemoryInputStream::createInternalCopy()
  52 {
  53     internalCopy.malloc (dataSize);
  54     memcpy (internalCopy, data, dataSize);
  55     data = internalCopy;
  56 }
  57
  58 MemoryInputStream::~MemoryInputStream()
  59 {
  60 }
  61
  62 int64 MemoryInputStream::getTotalLength()
  63 {
  64     return (int64) dataSize;
  65 }
  66
  67 int MemoryInputStream::read (void* const buffer, const int howMany)
  68 {
  69     wassert (buffer != nullptr && howMany >= 0);
  70
  71     if (howMany <= 0 || position >= dataSize)
  72         return 0;
  73
  74     const size_t num = jmin ((size_t) howMany, dataSize - position);
  75
  76     if (num > 0)
  77     {
  78         memcpy (buffer, addBytesToPointer (data, position), num);
  79         position += num;
  80     }
  81
  82     return (int) num;
  83 }
  84
  85 bool MemoryInputStream::isExhausted()
  86 {
  87     return position >= dataSize;
  88 }
  89
  90 bool MemoryInputStream::setPosition (const int64 pos)
  91 {
  92     position = (size_t) jlimit ((int64) 0, (int64) dataSize, pos);
  93     return true;
  94 }
  95
  96 int64 MemoryInputStream::getPosition()
  97 {
  98     return (int64) position;
  99 }
 100
 101
 102 //==============================================================================
 103 #if WATER_UNIT_TESTS
 104
 105 class MemoryStreamTests  : public UnitTest
 106 {
 107 public:
 108     MemoryStreamTests() : UnitTest ("MemoryInputStream & MemoryOutputStream") {}
 109
 110     void runTest() override
 111     {
 112         beginTest ("Basics");
 113         Random r = getRandom();
 114
 115         int randomInt = r.nextInt();
 116         int64 randomInt64 = r.nextInt64();
 117         double randomDouble = r.nextDouble();
 118         String randomString (createRandomWideCharString (r));
 119
 120         MemoryOutputStream mo;
 121         mo.writeInt (randomInt);
 122         mo.writeIntBigEndian (randomInt);
 123         mo.writeCompressedInt (randomInt);
 124         mo.writeString (randomString);
 125         mo.writeInt64 (randomInt64);
 126         mo.writeInt64BigEndian (randomInt64);
 127         mo.writeDouble (randomDouble);
 128         mo.writeDoubleBigEndian (randomDouble);
 129
 130         MemoryInputStream mi (mo.getData(), mo.getDataSize(), false);
 131         expect (mi.readInt() == randomInt);
 132         expect (mi.readIntBigEndian() == randomInt);
 133         expect (mi.readCompressedInt() == randomInt);
 134         expectEquals (mi.readString(), randomString);
 135         expect (mi.readInt64() == randomInt64);
 136         expect (mi.readInt64BigEndian() == randomInt64);
 137         expect (mi.readDouble() == randomDouble);
 138         expect (mi.readDoubleBigEndian() == randomDouble);
 139     }
 140
 141     static String createRandomWideCharString (Random& r)
 142     {
 143         water_wchar buffer [50] = { 0 };
 144
 145         for (int i = 0; i < numElementsInArray (buffer) - 1; ++i)
 146         {
 147             if (r.nextBool())
 148             {
 149                 do
 150                 {
 151                     buffer[i] = (water_wchar) (1 + r.nextInt (0x10ffff - 1));
 152                 }
 153                 while (! CharPointer_UTF16::canRepresent (buffer[i]));
 154             }
 155             else
 156                 buffer[i] = (water_wchar) (1 + r.nextInt (0xff));
 157         }
 158
 159         return CharPointer_UTF32 (buffer);
 160     }
 161 };
 162
 163 static MemoryStreamTests memoryInputStreamUnitTests;
 164
 165 #endif
 166
 167 }