/src/libwpd/src/lib/WPXMemoryStream.cpp
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1 | | /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */ |
2 | | /* libwpd |
3 | | * Version: MPL 2.0 / LGPLv2.1+ |
4 | | * |
5 | | * This Source Code Form is subject to the terms of the Mozilla Public |
6 | | * License, v. 2.0. If a copy of the MPL was not distributed with this |
7 | | * file, You can obtain one at http://mozilla.org/MPL/2.0/. |
8 | | * |
9 | | * Major Contributor(s): |
10 | | * Copyright (C) 2004-2005 William Lachance (wrlach@gmail.com) |
11 | | * Copyright (C) 2006 Fridrich Strba (fridrich.strba@bluewin.ch) |
12 | | * |
13 | | * For minor contributions see the git repository. |
14 | | * |
15 | | * Alternatively, the contents of this file may be used under the terms |
16 | | * of the GNU Lesser General Public License Version 2.1 or later |
17 | | * (LGPLv2.1+), in which case the provisions of the LGPLv2.1+ are |
18 | | * applicable instead of those above. |
19 | | * |
20 | | * For further information visit http://libwpd.sourceforge.net |
21 | | */ |
22 | | |
23 | | /* "This product is not manufactured, approved, or supported by |
24 | | * Corel Corporation or Corel Corporation Limited." |
25 | | */ |
26 | | |
27 | | #include "WPXMemoryStream.h" |
28 | | #include "libwpd_internal.h" |
29 | | |
30 | | |
31 | | WPXMemoryInputStream::WPXMemoryInputStream(unsigned char *data, unsigned long size) : |
32 | 316k | librevenge::RVNGInputStream(), |
33 | 316k | m_offset(0), |
34 | 316k | m_size(size), |
35 | 316k | m_data(data) |
36 | 316k | { |
37 | 316k | } |
38 | | |
39 | | WPXMemoryInputStream::~WPXMemoryInputStream() |
40 | 316k | { |
41 | 316k | } |
42 | | |
43 | | const unsigned char *WPXMemoryInputStream::read(unsigned long numBytes, unsigned long &numBytesRead) |
44 | 436M | { |
45 | 436M | numBytesRead = 0; |
46 | | |
47 | 436M | if (numBytes == 0) |
48 | 0 | return nullptr; |
49 | | |
50 | 436M | long numBytesToRead; |
51 | | |
52 | 436M | if ((m_offset+numBytes) < m_size) |
53 | 435M | numBytesToRead = numBytes; |
54 | 712k | else |
55 | 712k | numBytesToRead = m_size - m_offset; |
56 | | |
57 | 436M | numBytesRead = numBytesToRead; // about as paranoid as we can be.. |
58 | | |
59 | 436M | if (numBytesToRead == 0) |
60 | 65.7k | return nullptr; |
61 | | |
62 | 436M | long oldOffset = m_offset; |
63 | 436M | m_offset += numBytesToRead; |
64 | | |
65 | 436M | return &m_data[oldOffset]; |
66 | 436M | } |
67 | | |
68 | | int WPXMemoryInputStream::seek(long offset, librevenge::RVNG_SEEK_TYPE seekType) |
69 | 40.0M | { |
70 | 40.0M | if (seekType == librevenge::RVNG_SEEK_CUR) |
71 | 1.77M | m_offset += offset; |
72 | 38.2M | else if (seekType == librevenge::RVNG_SEEK_SET) |
73 | 38.2M | m_offset = offset; |
74 | 0 | else if (seekType == librevenge::RVNG_SEEK_END) |
75 | 0 | m_offset = m_size+offset; |
76 | | |
77 | 40.0M | if (m_offset < 0) |
78 | 0 | { |
79 | 0 | m_offset = 0; |
80 | 0 | return 1; |
81 | 0 | } |
82 | 40.0M | if ((long)m_offset > (long)m_size) |
83 | 10.6M | { |
84 | 10.6M | m_offset = m_size; |
85 | 10.6M | return 1; |
86 | 10.6M | } |
87 | | |
88 | 29.3M | return 0; |
89 | 40.0M | } |
90 | | |
91 | | long WPXMemoryInputStream::tell() |
92 | 19.4M | { |
93 | 19.4M | return m_offset; |
94 | 19.4M | } |
95 | | |
96 | | bool WPXMemoryInputStream::isEnd() |
97 | 397M | { |
98 | 397M | if ((long)m_offset == (long)m_size) |
99 | 663k | return true; |
100 | | |
101 | 397M | return false; |
102 | 397M | } |
103 | | /* vim:set shiftwidth=4 softtabstop=4 noexpandtab: */ |