1/*
2Open Asset Import Library (assimp)
3----------------------------------------------------------------------
4
5Copyright (c) 2006-2017, assimp team
6
7All rights reserved.
8
9Redistribution and use of this software in source and binary forms,
10with or without modification, are permitted provided that the
11following conditions are met:
12
13* Redistributions of source code must retain the above
14 copyright notice, this list of conditions and the
15 following disclaimer.
16
17* Redistributions in binary form must reproduce the above
18 copyright notice, this list of conditions and the
19 following disclaimer in the documentation and/or other
20 materials provided with the distribution.
21
22* Neither the name of the assimp team, nor the names of its
23 contributors may be used to endorse or promote products
24 derived from this software without specific prior
25 written permission of the assimp team.
26
27THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38
39----------------------------------------------------------------------
40*/
41
42/** @file DXFHelper.h
43 * @brief Internal utilities for the DXF loader.
44 */
45
46#ifndef INCLUDED_DXFHELPER_H
47#define INCLUDED_DXFHELPER_H
48
49#include "LineSplitter.h"
50#include "TinyFormatter.h"
51#include "StreamReader.h"
52#include "fast_atof.h"
53#include <vector>
54#include <assimp/DefaultLogger.hpp>
55
56namespace Assimp {
57 namespace DXF {
58
59
60// read pairs of lines, parse group code and value and provide utilities
61// to convert the data to the target data type.
62class LineReader
63{
64
65public:
66
67 LineReader(StreamReaderLE& reader)
68 // do NOT skip empty lines. In DXF files, they count as valid data.
69 : splitter(reader,false,true)
70 , groupcode( 0 )
71 , value()
72 , end()
73 {
74 }
75
76public:
77
78
79 // -----------------------------------------
80 bool Is(int gc, const char* what) const {
81 return groupcode == gc && !strcmp(what,value.c_str());
82 }
83
84 // -----------------------------------------
85 bool Is(int gc) const {
86 return groupcode == gc;
87 }
88
89 // -----------------------------------------
90 int GroupCode() const {
91 return groupcode;
92 }
93
94 // -----------------------------------------
95 const std::string& Value() const {
96 return value;
97 }
98
99 // -----------------------------------------
100 bool End() const {
101 return !((bool)*this);
102 }
103
104public:
105
106 // -----------------------------------------
107 unsigned int ValueAsUnsignedInt() const {
108 return strtoul10(value.c_str());
109 }
110
111 // -----------------------------------------
112 int ValueAsSignedInt() const {
113 return strtol10(value.c_str());
114 }
115
116 // -----------------------------------------
117 float ValueAsFloat() const {
118 return fast_atof(value.c_str());
119 }
120
121public:
122
123 // -----------------------------------------
124 /** pseudo-iterator increment to advance to the next (groupcode/value) pair */
125 LineReader& operator++() {
126 if (end) {
127 if (end == 1) {
128 ++end;
129 }
130 return *this;
131 }
132
133 try {
134 groupcode = strtol10(splitter->c_str());
135 splitter++;
136
137 value = *splitter;
138 splitter++;
139
140 // automatically skip over {} meta blocks (these are for application use
141 // and currently not relevant for Assimp).
142 if (value.length() && value[0] == '{') {
143
144 size_t cnt = 0;
145 for(;splitter->length() && splitter->at(0) != '}'; splitter++, cnt++);
146
147 splitter++;
148 DefaultLogger::get()->debug((Formatter::format("DXF: skipped over control group ("),cnt," lines)"));
149 }
150 } catch(std::logic_error&) {
151 ai_assert(!splitter);
152 }
153 if (!splitter) {
154 end = 1;
155 }
156 return *this;
157 }
158
159 // -----------------------------------------
160 LineReader& operator++(int) {
161 return ++(*this);
162 }
163
164
165 // -----------------------------------------
166 operator bool() const {
167 return end <= 1;
168 }
169
170private:
171
172 LineSplitter splitter;
173 int groupcode;
174 std::string value;
175 int end;
176};
177
178
179
180// represents a POLYLINE or a LWPOLYLINE. or even a 3DFACE The data is converted as needed.
181struct PolyLine
182{
183 PolyLine()
184 : flags()
185 {}
186
187 std::vector<aiVector3D> positions;
188 std::vector<aiColor4D> colors;
189 std::vector<unsigned int> indices;
190 std::vector<unsigned int> counts;
191 unsigned int flags;
192
193 std::string layer;
194 std::string desc;
195};
196
197
198// reference to a BLOCK. Specifies its own coordinate system.
199struct InsertBlock
200{
201 InsertBlock()
202 : scale(1.f,1.f,1.f)
203 , angle()
204 {}
205
206 aiVector3D pos;
207 aiVector3D scale;
208 float angle;
209
210 std::string name;
211};
212
213
214// keeps track of all geometry in a single BLOCK.
215struct Block
216{
217 std::vector< std::shared_ptr<PolyLine> > lines;
218 std::vector<InsertBlock> insertions;
219
220 std::string name;
221 aiVector3D base;
222};
223
224
225struct FileData
226{
227 // note: the LAST block always contains the stuff from ENTITIES.
228 std::vector<Block> blocks;
229};
230
231
232
233
234
235}}
236#endif
237