1 /* libwpg\r
2 * Copyright (C) 2006 Ariya Hidayat (ariya@kde.org)\r
3 * Copyright (C) 2004 Marc Oude Kotte (marc@solcon.nl)\r
4 * Copyright (C) 2005 Fridrich Strba (fridrich.strba@bluewin.ch)\r
5 *\r
6 * This library is free software; you can redistribute it and/or\r
7 * modify it under the terms of the GNU Library General Public\r
8 * License as published by the Free Software Foundation; either\r
9 * version 2 of the License, or (at your option) any later version.\r
10 *\r
11 * This library is distributed in the hope that it will be useful,\r
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\r
14 * Library General Public License for more details.\r
15 *\r
16 * You should have received a copy of the GNU Library General Public\r
17 * License along with this library; if not, write to the \r
18 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, \r
19 * Boston, MA 02111-1301 USA\r
20 *\r
21 * For further information visit http://libwpg.sourceforge.net\r
22 */\r
23 \r
24 /* "This product is not manufactured, approved, or supported by\r
25 * Corel Corporation or Corel Corporation Limited."\r
26 */\r
27 \r
28 #include "WPGXParser.h"\r
29 \r
30 using namespace libwpg;\r
31 \r
32 WPGXParser::WPGXParser(WPGInputStream *input, WPGPaintInterface* painter):\r
33 m_input(input), m_painter(painter)\r
34 {\r
35 }\r
36 \r
37 unsigned char WPGXParser::readU8()\r
38 {\r
39 return m_input->getc();\r
40 }\r
41 \r
42 unsigned short WPGXParser::readU16()\r
43 {\r
44 unsigned short p0 = (unsigned short)readU8();\r
45 unsigned short p1 = (unsigned short)readU8();\r
46 return p0|(p1<<8);\r
47 }\r
48 \r
49 unsigned long WPGXParser::readU32()\r
50 {\r
51 unsigned long p0 = (unsigned short)readU8();\r
52 unsigned long p1 = (unsigned short)readU8();\r
53 unsigned long p2 = (unsigned short)readU8();\r
54 unsigned long p3 = (unsigned short)readU8();\r
55 return p0|(p1<<8)|(p2<<16)|(p3<<24);\r
56 }\r
57 \r
58 char WPGXParser::readS8()\r
59 {\r
60 return (char)m_input->getc();\r
61 }\r
62 \r
63 short WPGXParser::readS16()\r
64 {\r
65 short p0 = readU8();\r
66 short p1 = readS8();\r
67 return p0|(p1<<8);\r
68 }\r
69 \r
70 long WPGXParser::readS32()\r
71 {\r
72 long p0 = readU8();\r
73 long p1 = readU8();\r
74 long p2 = readU8();\r
75 long p3 = readS8();\r
76 return p0|(p1<<8)|(p2<<16)|(p3<<24);\r
77 }\r
78 \r
79 unsigned int WPGXParser::readVariableLengthInteger()\r
80 {\r
81 // read a byte\r
82 unsigned char value8 = readU8();\r
83 // if it's in the range 0-0xFE, then we have a 8-bit value\r
84 if (value8<=0xFE) {\r
85 return (unsigned int)value8;\r
86 } else {\r
87 // now read a 16 bit value\r
88 unsigned short value16 = readU16();\r
89 // if the MSB is 1, we have a 32 bit value\r
90 if (value16>>15) {\r
91 // read the next 16 bit value (LSB part, in value16 resides the MSB part)\r
92 unsigned long lvalue16 = readU16();\r
93 unsigned long value32 = value16 & 0x7fff; // mask out the MSB\r
94 return (value32<<16)+lvalue16;\r
95 } else {\r
96 // we have a 16 bit value, return it\r
97 return (unsigned int)value16;\r
98 }\r
99 }\r
100 \r
101 // unreachable\r
102 return 0;\r
103 }\r