1 | /* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */ |
2 | /* If you are missing that file, acquire a complete release at teeworlds.com. */ |
3 | #include <base/system.h> |
4 | |
5 | #include "compression.h" |
6 | #include "packer.h" |
7 | |
8 | void CPacker::Reset() |
9 | { |
10 | m_Error = false; |
11 | m_pCurrent = m_aBuffer; |
12 | m_pEnd = m_pCurrent + PACKER_BUFFER_SIZE; |
13 | } |
14 | |
15 | void CPacker::AddInt(int i) |
16 | { |
17 | if(m_Error) |
18 | return; |
19 | |
20 | unsigned char *pNext = CVariableInt::Pack(pDst: m_pCurrent, i, DstSize: m_pEnd - m_pCurrent); |
21 | if(!pNext) |
22 | { |
23 | m_Error = true; |
24 | return; |
25 | } |
26 | m_pCurrent = pNext; |
27 | } |
28 | |
29 | void CPacker::AddString(const char *pStr, int Limit) |
30 | { |
31 | if(m_Error) |
32 | return; |
33 | |
34 | if(Limit <= 0) |
35 | { |
36 | Limit = PACKER_BUFFER_SIZE; |
37 | } |
38 | while(*pStr && Limit != 0) |
39 | { |
40 | int Codepoint = str_utf8_decode(ptr: &pStr); |
41 | if(Codepoint == -1) |
42 | { |
43 | Codepoint = 0xfffd; // Unicode replacement character. |
44 | } |
45 | char aGarbage[4]; |
46 | int Length = str_utf8_encode(ptr: aGarbage, chr: Codepoint); |
47 | if(Limit < Length) |
48 | { |
49 | break; |
50 | } |
51 | // Ensure space for the null termination. |
52 | if(m_pEnd - m_pCurrent < Length + 1) |
53 | { |
54 | m_Error = true; |
55 | break; |
56 | } |
57 | Length = str_utf8_encode(ptr: (char *)m_pCurrent, chr: Codepoint); |
58 | m_pCurrent += Length; |
59 | Limit -= Length; |
60 | } |
61 | *m_pCurrent++ = 0; |
62 | } |
63 | |
64 | void CPacker::AddRaw(const void *pData, int Size) |
65 | { |
66 | if(m_Error) |
67 | return; |
68 | |
69 | if(m_pCurrent + Size > m_pEnd) |
70 | { |
71 | m_Error = true; |
72 | return; |
73 | } |
74 | |
75 | mem_copy(dest: m_pCurrent, source: pData, size: Size); |
76 | m_pCurrent += Size; |
77 | } |
78 | |
79 | void CUnpacker::Reset(const void *pData, int Size) |
80 | { |
81 | m_Error = false; |
82 | m_pStart = (const unsigned char *)pData; |
83 | m_pEnd = m_pStart + Size; |
84 | m_pCurrent = m_pStart; |
85 | } |
86 | |
87 | int CUnpacker::GetInt() |
88 | { |
89 | if(m_Error) |
90 | return 0; |
91 | |
92 | if(m_pCurrent >= m_pEnd) |
93 | { |
94 | m_Error = true; |
95 | return 0; |
96 | } |
97 | |
98 | int i; |
99 | const unsigned char *pNext = CVariableInt::Unpack(pSrc: m_pCurrent, pInOut: &i, SrcSize: m_pEnd - m_pCurrent); |
100 | if(!pNext) |
101 | { |
102 | m_Error = true; |
103 | return 0; |
104 | } |
105 | m_pCurrent = pNext; |
106 | return i; |
107 | } |
108 | |
109 | int CUnpacker::GetIntOrDefault(int Default) |
110 | { |
111 | if(m_Error) |
112 | { |
113 | return 0; |
114 | } |
115 | if(m_pCurrent == m_pEnd) |
116 | { |
117 | return Default; |
118 | } |
119 | return GetInt(); |
120 | } |
121 | |
122 | int CUnpacker::GetUncompressedInt() |
123 | { |
124 | if(m_Error) |
125 | return 0; |
126 | |
127 | if(m_pCurrent + sizeof(int) > m_pEnd) |
128 | { |
129 | m_Error = true; |
130 | return 0; |
131 | } |
132 | |
133 | int i; |
134 | mem_copy(dest: &i, source: m_pCurrent, size: sizeof(int)); |
135 | m_pCurrent += sizeof(int); |
136 | return i; |
137 | } |
138 | |
139 | int CUnpacker::GetUncompressedIntOrDefault(int Default) |
140 | { |
141 | if(m_Error) |
142 | { |
143 | return 0; |
144 | } |
145 | if(m_pCurrent == m_pEnd) |
146 | { |
147 | return Default; |
148 | } |
149 | return GetUncompressedInt(); |
150 | } |
151 | |
152 | const char *CUnpacker::GetString(int SanitizeType) |
153 | { |
154 | if(m_Error) |
155 | return "" ; |
156 | |
157 | if(m_pCurrent >= m_pEnd) |
158 | { |
159 | m_Error = true; |
160 | return "" ; |
161 | } |
162 | |
163 | char *pPtr = (char *)m_pCurrent; |
164 | while(*m_pCurrent) // skip the string |
165 | { |
166 | m_pCurrent++; |
167 | if(m_pCurrent == m_pEnd) |
168 | { |
169 | m_Error = true; |
170 | return "" ; |
171 | } |
172 | } |
173 | m_pCurrent++; |
174 | |
175 | if(!str_utf8_check(str: pPtr)) |
176 | { |
177 | m_Error = true; |
178 | return "" ; |
179 | } |
180 | |
181 | // sanitize all strings |
182 | if(SanitizeType & SANITIZE) |
183 | str_sanitize(str: pPtr); |
184 | else if(SanitizeType & SANITIZE_CC) |
185 | str_sanitize_cc(str: pPtr); |
186 | return SanitizeType & SKIP_START_WHITESPACES ? str_utf8_skip_whitespaces(str: pPtr) : pPtr; |
187 | } |
188 | |
189 | const unsigned char *CUnpacker::GetRaw(int Size) |
190 | { |
191 | const unsigned char *pPtr = m_pCurrent; |
192 | if(m_Error) |
193 | return 0; |
194 | |
195 | // check for nasty sizes |
196 | if(Size < 0 || m_pCurrent + Size > m_pEnd) |
197 | { |
198 | m_Error = true; |
199 | return 0; |
200 | } |
201 | |
202 | // "unpack" the data |
203 | m_pCurrent += Size; |
204 | return pPtr; |
205 | } |
206 | |