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juce_FileInputStream.cpp
/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2022 - Raw Material Software Limited
JUCE is an open source library subject to commercial or open-source
licensing.
The code included in this file is provided 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.
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce
{
int64 juce_fileSetPosition (void* handle, int64 pos);
//==============================================================================
FileInputStream::FileInputStream (const File& f) : file (f)
{
openHandle();
}
int64 FileInputStream::getTotalLength()
{
// You should always check that a stream opened successfully before using it!
jassert (openedOk());
return file.getSize();
}
int FileInputStream::read (void* buffer, int bytesToRead)
{
// You should always check that a stream opened successfully before using it!
jassert (openedOk());
// The buffer should never be null, and a negative size is probably a
// sign that something is broken!
jassert (buffer != nullptr && bytesToRead >= 0);
auto num = readInternal (buffer, (size_t) bytesToRead);
currentPosition += (int64) num;
return (int) num;
}
bool FileInputStream::isExhausted()
{
return currentPosition >= getTotalLength();
}
int64 FileInputStream::getPosition()
{
return currentPosition;
}
bool FileInputStream::setPosition (int64 pos)
{
// You should always check that a stream opened successfully before using it!
jassert (openedOk());
if (pos != currentPosition)
currentPosition = juce_fileSetPosition (fileHandle, pos);
return currentPosition == pos;
}
//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS
struct FileInputStreamTests final : public UnitTest
{
FileInputStreamTests()
: UnitTest ("FileInputStream", UnitTestCategories::streams)
{}
void runTest() override
{
beginTest ("Open stream non-existent file");
{
auto tempFile = File::createTempFile (".txt");
expect (! tempFile.exists());
FileInputStream stream (tempFile);
expect (stream.failedToOpen());
}
beginTest ("Open stream existing file");
{
auto tempFile = File::createTempFile (".txt");
tempFile.create();
expect (tempFile.exists());
FileInputStream stream (tempFile);
expect (stream.openedOk());
}
const MemoryBlock data ("abcdefghijklmnopqrstuvwxyz", 26);
File f (File::createTempFile (".txt"));
f.appendData (data.getData(), data.getSize());
FileInputStream stream (f);
beginTest ("Read");
{
expectEquals (stream.getPosition(), (int64) 0);
expectEquals (stream.getTotalLength(), (int64) data.getSize());
expectEquals (stream.getNumBytesRemaining(), stream.getTotalLength());
expect (! stream.isExhausted());
size_t numBytesRead = 0;
MemoryBlock readBuffer (data.getSize());
while (numBytesRead < data.getSize())
{
numBytesRead += (size_t) stream.read (&readBuffer[numBytesRead], 3);
expectEquals (stream.getPosition(), (int64) numBytesRead);
expectEquals (stream.getNumBytesRemaining(), (int64) (data.getSize() - numBytesRead));
expect (stream.isExhausted() == (numBytesRead == data.getSize()));
}
expectEquals (stream.getPosition(), (int64) data.getSize());
expectEquals (stream.getNumBytesRemaining(), (int64) 0);
expect (stream.isExhausted());
expect (readBuffer == data);
}
beginTest ("Skip");
{
stream.setPosition (0);
expectEquals (stream.getPosition(), (int64) 0);
expectEquals (stream.getTotalLength(), (int64) data.getSize());
expectEquals (stream.getNumBytesRemaining(), stream.getTotalLength());
expect (! stream.isExhausted());
size_t numBytesRead = 0;
const int numBytesToSkip = 5;
while (numBytesRead < data.getSize())
{
stream.skipNextBytes (numBytesToSkip);
numBytesRead += numBytesToSkip;
numBytesRead = std::min (numBytesRead, data.getSize());
expectEquals (stream.getPosition(), (int64) numBytesRead);
expectEquals (stream.getNumBytesRemaining(), (int64) (data.getSize() - numBytesRead));
expect (stream.isExhausted() == (numBytesRead == data.getSize()));
}
expectEquals (stream.getPosition(), (int64) data.getSize());
expectEquals (stream.getNumBytesRemaining(), (int64) 0);
expect (stream.isExhausted());
f.deleteFile();
}
}
};
static FileInputStreamTests fileInputStreamTests;
#endif
} // namespace juce
juce::FileInputStream::getPosition
int64 getPosition() override
Definition juce_FileInputStream.cpp:63
juce::FileInputStream::setPosition
bool setPosition(int64) override
Definition juce_FileInputStream.cpp:68
juce::FileInputStream::read
int read(void *, int) override
Definition juce_FileInputStream.cpp:43
juce::FileInputStream::getTotalLength
int64 getTotalLength() override
Definition juce_FileInputStream.cpp:35
juce::FileInputStream::isExhausted
bool isExhausted() override
Definition juce_FileInputStream.cpp:58
juce::FileInputStream::openedOk
bool openedOk() const noexcept
Definition juce_FileInputStream.h:67
juce::FileInputStream::FileInputStream
FileInputStream(const File &fileToRead)
Definition juce_FileInputStream.cpp:30
juce::File
Definition juce_File.h:45
juce::UnitTest
Definition juce_UnitTest.h:70