1 //------------------------------------------------------------------------------ 2 // Copyright (c) 2001-2002, OpenBeOS 3 // 4 // Permission is hereby granted, free of charge, to any person obtaining a 5 // copy of this software and associated documentation files (the "Software"), 6 // to deal in the Software without restriction, including without limitation 7 // the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 // and/or sell copies of the Software, and to permit persons to whom the 9 // Software is furnished to do so, subject to the following conditions: 10 // 11 // The above copyright notice and this permission notice shall be included in 12 // all copies or substantial portions of the Software. 13 // 14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 19 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 20 // DEALINGS IN THE SOFTWARE. 21 // 22 // File Name: MessageUtils.cpp 23 // Author(s): Erik Jaesler <erik@cgsoftware.com> 24 // 25 // Description: Extra messaging utility functions 26 // 27 // 28 //------------------------------------------------------------------------------ 29 // Standard Includes ----------------------------------------------------------- 30 #include <string.h> 31 32 // System Includes ------------------------------------------------------------- 33 #include <ByteOrder.h> 34 35 // Project Includes ------------------------------------------------------------ 36 #include <MessageUtils.h> 37 38 // Local Includes -------------------------------------------------------------- 39 40 // Local Defines --------------------------------------------------------------- 41 42 // Globals --------------------------------------------------------------------- 43 44 //------------------------------------------------------------------------------ 45 uint32 _checksum_(const uchar* buf, int32 size) 46 { 47 uint32 sum = 0; 48 uint32 temp = 0; 49 50 while (size > 3) { 51 #if defined(__INTEL__) 52 sum += B_SWAP_INT32(*(int*)buf); 53 #else 54 sum += *(int*)buf; 55 #endif 56 57 buf += 4; 58 size -= 4; 59 } 60 61 while (size > 0) { 62 temp = (temp << 8) + *buf++; 63 size -= 1; 64 sum += temp; 65 } 66 67 return sum; 68 } 69 //------------------------------------------------------------------------------ 70 71 72 namespace BPrivate { // Only putting these here because Be did 73 //------------------------------------------------------------------------------ 74 status_t entry_ref_flatten(char* buffer, size_t* size, const entry_ref* ref) 75 { 76 memcpy((void*)buffer, (const void*)&ref->device, sizeof (ref->device)); 77 buffer += sizeof (ref->device); 78 memcpy((void*)buffer, (const void*)&ref->directory, sizeof (ref->directory)); 79 buffer += sizeof (ref->directory); 80 81 size_t len = 0; 82 if (ref->name) 83 { 84 len = strlen(ref->name) + 1; // extra for NULL terminator 85 memcpy((void*)buffer, (const void*)ref->name, len); 86 } 87 88 *size = sizeof (ref->device) + sizeof (ref->directory) + len; 89 return B_OK; 90 } 91 //------------------------------------------------------------------------------ 92 status_t entry_ref_unflatten(entry_ref* ref, const char* buffer, size_t size) 93 { 94 if (size < (sizeof (ref->device) + sizeof (ref->directory))) 95 { 96 *ref = entry_ref(); 97 return B_BAD_VALUE; 98 } 99 100 memcpy((void*)&ref->device, (const void*)buffer, sizeof (ref->device)); 101 buffer += sizeof (ref->device); 102 memcpy((void*)&ref->directory, (const void*)buffer, 103 sizeof (ref->directory)); 104 buffer += sizeof (ref->directory); 105 106 if (ref->device != -1 && 107 size > (sizeof (ref->device) + sizeof (ref->directory))) 108 { 109 ref->set_name(buffer); 110 if (ref->name == NULL) 111 { 112 *ref = entry_ref(); 113 return B_NO_MEMORY; 114 } 115 } 116 else 117 { 118 ref->set_name(NULL); 119 } 120 121 return B_OK; 122 } 123 //------------------------------------------------------------------------------ 124 status_t entry_ref_swap(char* buffer, size_t size) 125 { 126 if (size < (sizeof (dev_t) + sizeof (ino_t))) 127 { 128 return B_BAD_DATA; 129 } 130 131 dev_t* dev = (dev_t*)buffer; 132 *dev = B_SWAP_INT32(*dev); 133 buffer += sizeof (dev_t); 134 135 ino_t* ino = (ino_t*)buffer; 136 *ino = B_SWAP_INT64(*ino); 137 138 return B_OK; 139 } 140 //------------------------------------------------------------------------------ 141 142 } // namespace BPrivate 143 144 //------------------------------------------------------------------------------ 145 int32 TChecksumHelper::CheckSum() 146 { 147 return _checksum_(fBuffer, fBufPtr - fBuffer); 148 } 149 //------------------------------------------------------------------------------ 150 151 /* 152 * $Log $ 153 * 154 * $Id $ 155 * 156 */ 157 158