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528b2c61 | 1 | |
2 | /* | |
47f6e231 | 3 | * $Id: StoreMeta.cc,v 1.5 2007/08/13 17:20:51 hno Exp $ |
528b2c61 | 4 | * |
5 | * DEBUG: section 20 Storage Manager Swapfile Metadata | |
6 | * AUTHOR: Kostas Anagnostakis | |
7 | * | |
8 | * SQUID Web Proxy Cache http://www.squid-cache.org/ | |
9 | * ---------------------------------------------------------- | |
10 | * | |
11 | * Squid is the result of efforts by numerous individuals from | |
12 | * the Internet community; see the CONTRIBUTORS file for full | |
13 | * details. Many organizations have provided support for Squid's | |
14 | * development; see the SPONSORS file for full details. Squid is | |
15 | * Copyrighted (C) 2001 by the Regents of the University of | |
16 | * California; see the COPYRIGHT file for full details. Squid | |
17 | * incorporates software developed and/or copyrighted by other | |
18 | * sources; see the CREDITS file for full details. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or modify | |
21 | * it under the terms of the GNU General Public License as published by | |
22 | * the Free Software Foundation; either version 2 of the License, or | |
23 | * (at your option) any later version. | |
24 | * | |
25 | * This program is distributed in the hope that it will be useful, | |
26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28 | * GNU General Public License for more details. | |
29 | * | |
30 | * You should have received a copy of the GNU General Public License | |
31 | * along with this program; if not, write to the Free Software | |
32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
33 | * | |
34 | */ | |
35 | ||
36 | #include "squid.h" | |
37 | #include "StoreMeta.h" | |
38 | #include "Store.h" | |
39 | #include "MemObject.h" | |
40 | #include "StoreMetaMD5.h" | |
41 | #include "StoreMetaURL.h" | |
42 | #include "StoreMetaSTD.h" | |
47f6e231 | 43 | #include "StoreMetaSTDLFS.h" |
528b2c61 | 44 | #include "StoreMetaVary.h" |
45 | ||
46 | bool | |
47 | StoreMeta::validType(char type) | |
48 | { | |
49 | /* VOID is reserved, and new types have to be added as classes */ | |
62e76326 | 50 | |
528b2c61 | 51 | if (type <= STORE_META_VOID || type >= STORE_META_END) { |
bf8fe701 | 52 | debugs(20, 0, "storeSwapMetaUnpack: bad type (" << type << ")!"); |
62e76326 | 53 | return false; |
528b2c61 | 54 | } |
62e76326 | 55 | |
528b2c61 | 56 | /* Unused in any current squid code */ |
57 | if (type == STORE_META_KEY_URL || | |
62e76326 | 58 | type == STORE_META_KEY_SHA || |
59 | type == STORE_META_HITMETERING || | |
60 | type == STORE_META_VALID) { | |
bf8fe701 | 61 | debugs(20, 0, "Obsolete and unused type (" << type << ") in disk metadata"); |
62e76326 | 62 | return false; |
528b2c61 | 63 | } |
62e76326 | 64 | |
528b2c61 | 65 | return true; |
66 | } | |
67 | ||
62e76326 | 68 | class IntRange |
69 | { | |
70 | ||
528b2c61 | 71 | public: |
62e76326 | 72 | IntRange (int minimum, int maximum) : _min (minimum), _max (maximum) |
73 | { | |
74 | if (_min > _max) { | |
75 | int temp = _min; | |
76 | _min = _max; | |
77 | _max = temp; | |
78 | } | |
79 | } | |
80 | ||
528b2c61 | 81 | bool includes (int anInt) const |
62e76326 | 82 | { |
83 | if (anInt < _min || anInt > _max) | |
84 | return false; | |
85 | ||
86 | return true; | |
87 | } | |
88 | ||
528b2c61 | 89 | private: |
90 | int _min; | |
91 | int _max; | |
92 | }; | |
93 | ||
94 | const int StoreMeta::MinimumTLVLength = 0; | |
95 | const int StoreMeta::MaximumTLVLength = 1 << 16; | |
96 | ||
97 | bool | |
98 | StoreMeta::validLength(int length) const | |
99 | { | |
62e76326 | 100 | if (!IntRange (MinimumTLVLength, MaximumTLVLength).includes(length)) { |
bf8fe701 | 101 | debugs(20, 0, "storeSwapMetaUnpack: insane length (" << length << ")!"); |
62e76326 | 102 | return false; |
528b2c61 | 103 | } |
62e76326 | 104 | |
528b2c61 | 105 | return true; |
106 | } | |
107 | ||
108 | ||
109 | StoreMeta * | |
110 | StoreMeta::Factory (char type, size_t len, void const *value) | |
111 | { | |
112 | if (!validType(type)) | |
113 | return NULL; | |
62e76326 | 114 | |
528b2c61 | 115 | StoreMeta *result; |
62e76326 | 116 | |
528b2c61 | 117 | switch (type) { |
62e76326 | 118 | |
119 | case STORE_META_KEY: | |
120 | result = new StoreMetaMD5; | |
121 | break; | |
122 | ||
123 | case STORE_META_URL: | |
124 | result = new StoreMetaURL; | |
125 | break; | |
126 | ||
127 | case STORE_META_STD: | |
128 | result = new StoreMetaSTD; | |
129 | break; | |
130 | ||
47f6e231 | 131 | case STORE_META_STD_LFS: |
132 | result = new StoreMetaSTDLFS; | |
133 | break; | |
134 | ||
62e76326 | 135 | case STORE_META_VARY_HEADERS: |
136 | result = new StoreMetaVary; | |
137 | break; | |
138 | ||
139 | default: | |
bf8fe701 | 140 | debugs(20, 0, "Attempt to create unknown concrete StoreMeta"); |
62e76326 | 141 | return NULL; |
528b2c61 | 142 | } |
62e76326 | 143 | |
528b2c61 | 144 | if (!result->validLength(len)) { |
00d77d6b | 145 | delete result; |
62e76326 | 146 | return NULL; |
528b2c61 | 147 | } |
62e76326 | 148 | |
528b2c61 | 149 | result->length = len; |
150 | result->value = xmalloc(len); | |
151 | xmemcpy(result->value, value, len); | |
152 | return result; | |
153 | } | |
154 | ||
155 | void | |
156 | StoreMeta::FreeList(StoreMeta **head) | |
157 | { | |
158 | StoreMeta *node; | |
62e76326 | 159 | |
528b2c61 | 160 | while ((node = *head) != NULL) { |
62e76326 | 161 | *head = node->next; |
162 | xfree(node->value); | |
00d77d6b | 163 | delete node; |
528b2c61 | 164 | } |
165 | } | |
166 | ||
167 | StoreMeta ** | |
168 | StoreMeta::Add(StoreMeta **tail, StoreMeta *aNode) | |
169 | { | |
170 | assert (*tail == NULL); | |
171 | *tail = aNode; | |
172 | return &aNode->next; /* return new tail pointer */ | |
173 | } | |
174 | ||
62e76326 | 175 | bool |
528b2c61 | 176 | StoreMeta::checkConsistency(StoreEntry *e) const |
177 | { | |
62e76326 | 178 | switch (getType()) { |
179 | ||
180 | case STORE_META_KEY: | |
181 | ||
182 | case STORE_META_URL: | |
183 | ||
184 | case STORE_META_VARY_HEADERS: | |
185 | assert(0); | |
186 | break; | |
187 | ||
188 | case STORE_META_STD: | |
189 | break; | |
190 | ||
47f6e231 | 191 | case STORE_META_STD_LFS: |
192 | break; | |
193 | ||
194 | case STORE_META_OBJSIZE: | |
195 | break; | |
196 | ||
62e76326 | 197 | default: |
bf8fe701 | 198 | debugs(20, 1, "WARNING: got unused STORE_META type " << getType()); |
62e76326 | 199 | break; |
200 | } | |
201 | ||
528b2c61 | 202 | return true; |
203 | } |