source: vscpl/src/hu/varadiistvan/scpl/io/_win32/BufferedStream.cc@ 26:c9f7229e60c9

Last change on this file since 26:c9f7229e60c9 was 9:84f0dcb053b4, checked in by István Váradi <ivaradi@…>, 12 years ago

Imported the Win32-specific I/O code

File size: 4.1 KB
Line 
1// Copyright (c) 2013 by István Váradi
2
3// This file is part of VSCPL, a simple cross-platform utility library
4
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are met:
7
8// 1. Redistributions of source code must retain the above copyright notice, this
9// list of conditions and the following disclaimer.
10// 2. Redistributions in binary form must reproduce the above copyright notice,
11// this list of conditions and the following disclaimer in the documentation
12// and/or other materials provided with the distribution.
13
14// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
15// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
18// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
23// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24
25// The views and conclusions contained in the software and documentation are those
26// of the authors and should not be interpreted as representing official policies,
27// either expressed or implied, of the FreeBSD Project.
28
29//------------------------------------------------------------------------------
30
31#include "BufferedStream.h"
32
33#include "ReadingBuffer.h"
34#include "WritingBuffer.h"
35
36//------------------------------------------------------------------------------
37
38using hu::varadiistvan::scpl::io::BufferedStream;
39
40//------------------------------------------------------------------------------
41
42BufferedStream::BufferedStream(Waiter* waiter, HANDLE handle,
43 size_t readingCapacity, size_t writingCapacity) :
44 Overlappable(waiter, handle),
45 readingBuffer( (readingCapacity==0) ? 0 :
46 new ReadingBuffer(readingCapacity, this)),
47 writingBuffer( (writingCapacity==0) ? 0 :
48 new WritingBuffer(writingCapacity, this))
49{
50}
51
52//------------------------------------------------------------------------------
53
54BufferedStream::~BufferedStream()
55{
56 delete writingBuffer;
57 delete readingBuffer;
58}
59
60//------------------------------------------------------------------------------
61
62ssize_t BufferedStream::read(void* dest, size_t length, Overlapped* overlapped)
63{
64 DWORD numRead = 0;
65 if (overlapped!=0) overlapped->reset();
66 bool result = ReadFile(handle, dest, length,
67 (overlapped==0) ? &numRead : 0,
68 (overlapped==0) ? 0 : overlapped->get());
69 DWORD error = GetLastError();
70 if (!result &&
71 (overlapped==0 ||
72 (error!=ERROR_IO_PENDING && error!=ERROR_IO_INCOMPLETE)))
73 {
74 setErrorCode(error);
75 return -1;
76 } else if (overlapped==0 || overlapped->getResult(numRead, handle)) {
77 return numRead;
78 } else {
79 return -1;
80 }
81}
82
83//------------------------------------------------------------------------------
84
85bool BufferedStream::write(const void* src, size_t length,
86 Overlapped* overlapped)
87{
88 if (overlapped!=0) overlapped->reset();
89 bool result = WriteFile(handle, src, length, 0,
90 (overlapped==0) ? 0 : overlapped->get());
91 DWORD error = GetLastError();
92 if (!result &&
93 (overlapped==0 ||
94 (error!=ERROR_IO_PENDING && error!=ERROR_IO_INCOMPLETE)))
95 {
96 setErrorCode(error);
97 return false;
98 } else if (overlapped==0) {
99 return result;
100 } else {
101 DWORD numWritten = 0;
102 return overlapped->getResult(numWritten, handle);
103 }
104}
105
106//------------------------------------------------------------------------------
107
108// Local Variables:
109// mode: C++
110// c-basic-offset: 4
111// indent-tabs-mode: nil
112// End:
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