1 // Copyright 2016 The SwiftShader Authors. All Rights Reserved.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include "Input.h"
16
17 #include <algorithm>
18 #include <cassert>
19 #include <cstring>
20
21 namespace pp
22 {
23
Input()24 Input::Input() : mCount(0), mString(0)
25 {
26 }
27
Input(int count,const char * const string[],const int length[])28 Input::Input(int count, const char* const string[], const int length[]) :
29 mCount(count),
30 mString(string)
31 {
32 assert(mCount >= 0);
33 mLength.reserve(mCount);
34 for (int i = 0; i < mCount; ++i)
35 {
36 int len = length ? length[i] : -1;
37 mLength.push_back(len < 0 ? strlen(mString[i]) : len);
38 }
39 }
40
read(char * buf,int maxSize)41 int Input::read(char* buf, int maxSize)
42 {
43 int nRead = 0;
44 while ((nRead < maxSize) && (mReadLoc.sIndex < mCount))
45 {
46 int size = mLength[mReadLoc.sIndex] - mReadLoc.cIndex;
47 size = std::min(size, maxSize);
48 memcpy(buf + nRead, mString[mReadLoc.sIndex] + mReadLoc.cIndex, size);
49 nRead += size;
50 mReadLoc.cIndex += size;
51
52 // Advance string if we reached the end of current string.
53 if (mReadLoc.cIndex == mLength[mReadLoc.sIndex])
54 {
55 ++mReadLoc.sIndex;
56 mReadLoc.cIndex = 0;
57 }
58 }
59 return nRead;
60 }
61
62 } // namespace pp
63
64