Panda3D

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datagram.cxx
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file datagram.cxx
10 * @author drose
11 * @date 2000-06-06
12 */
13
14#include "datagram.h"
15
16#include "pnotify.h"
17
18// for sprintf().
19#include <stdio.h>
20
21 TypeHandle Datagram::_type_handle;
22
23/**
24 *
25 */
26Datagram::
27~Datagram() {
28}
29
30/**
31 * Resets the datagram to empty, in preparation for building up a new
32 * datagram.
33 */
34 void Datagram::
35 clear() {
36 _data.clear();
37}
38
39/**
40 * Writes a representation of the entire datagram contents, as a sequence of
41 * hex (and ASCII) values.
42 */
43 void Datagram::
44 dump_hex(std::ostream &out, unsigned int indent) const {
45 const char *message = (const char *)get_data();
46 size_t num_bytes = get_length();
47 for (size_t line = 0; line < num_bytes; line += 16) {
48 char hex[12];
49 sprintf(hex, "%04x ", ((unsigned int )line));
50 for (unsigned int ind = 0; ind < indent; ind++) {
51 out << " ";
52 }
53 out << hex;
54
55 size_t p;
56 for (p = line; p < line + 16; p++) {
57 if (p < num_bytes) {
58 char hex[12];
59 sprintf(hex, " %02x", ((unsigned int)message[p]) & 0xff);
60 out << hex;
61 } else {
62 out << " ";
63 }
64 }
65 out << " ";
66 for (p = line; p < line + 16 && p < num_bytes; p++) {
67 // must cast to (unsigned char) to avoid conversion to large negative
68 // integers outside of 0xFF range
69 if (isgraph((unsigned char)message[p]) || message[p] == ' ') {
70 out << (char)message[p];
71 } else {
72 out << ".";
73 }
74 }
75 out << "\n";
76 }
77}
78
79/**
80 * Adds a variable-length wstring to the datagram.
81 */
82 void Datagram::
83 add_wstring(const std::wstring &str) {
84 // By convention, wstrings are marked with 32-bit lengths.
85 add_uint32((uint32_t)str.length());
86
87 // Now append each character in the string. We store each code little-
88 // endian, for no real good reason.
89 std::wstring::const_iterator ci;
90 for (ci = str.begin(); ci != str.end(); ++ci) {
91 add_uint16((uint16_t)*ci);
92 }
93}
94
95/**
96 * Adds the indicated number of zero bytes to the datagram.
97 */
98 void Datagram::
99 pad_bytes(size_t size) {
100 nassertv((int)size >= 0);
101
102 if (_data == nullptr) {
103 // Create a new array.
104 _data = PTA_uchar::empty_array(0);
105
106 } else if (_data.get_ref_count() != 1) {
107 // Copy on write.
108 PTA_uchar new_data = PTA_uchar::empty_array(0);
109 new_data.v() = _data.v();
110 _data = new_data;
111 }
112
113 // Now append the data.
114
115 // It is very important that we *don't* do this reserve() operation. See
116 // the further comments in append_data(), below.
117 //_data.reserve(_data.size() + size);
118
119 while (size > 0) {
120 _data.push_back('\0');
121 --size;
122 }
123}
124
125/**
126 * Appends some more raw data to the end of the datagram.
127 */
128 void Datagram::
129 append_data(const void *data, size_t size) {
130 nassertv((int)size >= 0);
131
132 if (_data == nullptr) {
133 // Create a new array.
134 _data = PTA_uchar::empty_array(0);
135
136 } else if (_data.get_ref_count() != 1) {
137 // Copy on write.
138 PTA_uchar new_data = PTA_uchar::empty_array(0);
139 new_data.v() = _data.v();
140 _data = new_data;
141 }
142
143 // Now append the data.
144
145 // It is very important that we *don't* do this reserve() operation. This
146 // actually slows it down on Windows, which takes the reserve() request as a
147 // fixed size the array should be set to (!) instead of as a minimum size to
148 // guarantee. This forces the array to reallocate itself with *every* call
149 // to append_data!
150 //_data.reserve(_data.size() + size);
151
152 _data.v().insert(_data.v().end(), (const unsigned char *)data,
153 (const unsigned char *)data + size);
154}
155
156/**
157 * Replaces the datagram's data with the indicated block.
158 */
159 void Datagram::
160 assign(const void *data, size_t size) {
161 nassertv((int)size >= 0);
162
163 _data = PTA_uchar::empty_array(0);
164 _data.v().insert(_data.v().end(), (const unsigned char *)data,
165 (const unsigned char *)data + size);
166}
167
168/**
169 * Write a string representation of this instance to <out>.
170 */
171 void Datagram::
172 output(std::ostream &out) const {
173 #ifndef NDEBUG //[
174 out<<""<<"Datagram";
175 #endif //] NDEBUG
176}
177
178/**
179 * Write a string representation of this instance to <out>.
180 */
181 void Datagram::
182 write(std::ostream &out, unsigned int indent) const {
183 #ifndef NDEBUG //[
184 out.width(indent);
185 out<<""<<"Datagram:\n";
186 dump_hex(out, indent);
187 #endif //] NDEBUG
188}
Datagram::add_uint32
void add_uint32(uint32_t value)
Adds an unsigned 32-bit integer to the datagram.
Definition datagram.I:94
Datagram::output
void output(std::ostream &out) const
Write a string representation of this instance to <out>.
Definition datagram.cxx:172
Datagram::write
void write(std::ostream &out, unsigned int indent=0) const
Write a string representation of this instance to <out>.
Definition datagram.cxx:182
Datagram::get_length
size_t get_length() const
Returns the number of bytes in the datagram.
Definition datagram.I:335
Datagram::add_wstring
void add_wstring(const std::wstring &str)
Adds a variable-length wstring to the datagram.
Definition datagram.cxx:83
Datagram::assign
void assign(const void *data, size_t size)
Replaces the datagram's data with the indicated block.
Definition datagram.cxx:160
Datagram::dump_hex
void dump_hex(std::ostream &out, unsigned int indent=0) const
Writes a representation of the entire datagram contents, as a sequence of hex (and ASCII) values.
Definition datagram.cxx:44
Datagram::clear
virtual void clear()
Resets the datagram to empty, in preparation for building up a new datagram.
Definition datagram.cxx:35
Datagram::append_data
void append_data(const void *data, size_t size)
Appends some more raw data to the end of the datagram.
Definition datagram.cxx:129
Datagram::pad_bytes
void pad_bytes(size_t size)
Adds the indicated number of zero bytes to the datagram.
Definition datagram.cxx:99
Datagram::add_uint16
void add_uint16(uint16_t value)
Adds an unsigned 16-bit integer to the datagram.
Definition datagram.I:85
Datagram::get_data
const void * get_data() const
Returns a pointer to the beginning of the datagram's data.
Definition datagram.I:327
TypeHandle
TypeHandle is the identifier used to differentiate C++ class types.
Definition typeHandle.h:81
datagram.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
indent
std::ostream & indent(std::ostream &out, int indent_level)
A handy function for doing text formatting.
Definition indent.cxx:20
pnotify.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.