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// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "Input.h"
#include <algorithm>
#include <cassert>
#include <cstring>
namespace pp
{
Input::Input() : mCount(0), mString(0)
{
}
Input::Input(int count, const char* const string[], const int length[]) :
mCount(count),
mString(string)
{
assert(mCount >= 0);
mLength.reserve(mCount);
for (int i = 0; i < mCount; ++i)
{
int len = length ? length[i] : -1;
mLength.push_back(len < 0 ? strlen(mString[i]) : len);
}
}
int Input::read(char* buf, int maxSize)
{
int nRead = 0;
while ((nRead < maxSize) && (mReadLoc.sIndex < mCount))
{
int size = mLength[mReadLoc.sIndex] - mReadLoc.cIndex;
size = std::min(size, maxSize);
memcpy(buf + nRead, mString[mReadLoc.sIndex] + mReadLoc.cIndex, size);
nRead += size;
mReadLoc.cIndex += size;
// Advance string if we reached the end of current string.
if (mReadLoc.cIndex == mLength[mReadLoc.sIndex])
{
++mReadLoc.sIndex;
mReadLoc.cIndex = 0;
}
}
return nRead;
}
} // namespace pp