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annotate libs/assimp/MemoryIOWrapper.h @ 0:b2f14e535253

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author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 01 Feb 2014 19:58:19 +0200
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nuclear@0 1 /*
nuclear@0 2 Open Asset Import Library (assimp)
nuclear@0 3 ----------------------------------------------------------------------
nuclear@0 4
nuclear@0 5 Copyright (c) 2006-2012, assimp team
nuclear@0 6 All rights reserved.
nuclear@0 7
nuclear@0 8 Redistribution and use of this software in source and binary forms,
nuclear@0 9 with or without modification, are permitted provided that the
nuclear@0 10 following conditions are met:
nuclear@0 11
nuclear@0 12 * Redistributions of source code must retain the above
nuclear@0 13 copyright notice, this list of conditions and the
nuclear@0 14 following disclaimer.
nuclear@0 15
nuclear@0 16 * Redistributions in binary form must reproduce the above
nuclear@0 17 copyright notice, this list of conditions and the
nuclear@0 18 following disclaimer in the documentation and/or other
nuclear@0 19 materials provided with the distribution.
nuclear@0 20
nuclear@0 21 * Neither the name of the assimp team, nor the names of its
nuclear@0 22 contributors may be used to endorse or promote products
nuclear@0 23 derived from this software without specific prior
nuclear@0 24 written permission of the assimp team.
nuclear@0 25
nuclear@0 26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
nuclear@0 27 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
nuclear@0 28 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
nuclear@0 29 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
nuclear@0 30 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
nuclear@0 31 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
nuclear@0 32 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
nuclear@0 33 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
nuclear@0 34 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
nuclear@0 35 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
nuclear@0 36 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
nuclear@0 37
nuclear@0 38 ----------------------------------------------------------------------
nuclear@0 39 */
nuclear@0 40
nuclear@0 41 /** @file MemoryIOWrapper.h
nuclear@0 42 * Handy IOStream/IOSystem implemetation to read directly from a memory buffer */
nuclear@0 43 #ifndef AI_MEMORYIOSTREAM_H_INC
nuclear@0 44 #define AI_MEMORYIOSTREAM_H_INC
nuclear@0 45 namespace Assimp {
nuclear@0 46 #define AI_MEMORYIO_MAGIC_FILENAME "$$$___magic___$$$"
nuclear@0 47 #define AI_MEMORYIO_MAGIC_FILENAME_LENGTH 17
nuclear@0 48
nuclear@0 49 // ----------------------------------------------------------------------------------
nuclear@0 50 /** Implementation of IOStream to read directly from a memory buffer */
nuclear@0 51 // ----------------------------------------------------------------------------------
nuclear@0 52 class MemoryIOStream : public IOStream
nuclear@0 53 {
nuclear@0 54 //friend class MemoryIOSystem;
nuclear@0 55 public:
nuclear@0 56 MemoryIOStream (const uint8_t* buff, size_t len, bool own = false)
nuclear@0 57 : buffer (buff)
nuclear@0 58 , length(len)
nuclear@0 59 , pos((size_t)0)
nuclear@0 60 , own(own)
nuclear@0 61 {
nuclear@0 62 }
nuclear@0 63
nuclear@0 64 public:
nuclear@0 65
nuclear@0 66 ~MemoryIOStream () {
nuclear@0 67 if(own) {
nuclear@0 68 delete[] buffer;
nuclear@0 69 }
nuclear@0 70 }
nuclear@0 71
nuclear@0 72 // -------------------------------------------------------------------
nuclear@0 73 // Read from stream
nuclear@0 74 size_t Read(void* pvBuffer, size_t pSize, size_t pCount) {
nuclear@0 75 const size_t cnt = std::min(pCount,(length-pos)/pSize),ofs = pSize*cnt;
nuclear@0 76
nuclear@0 77 memcpy(pvBuffer,buffer+pos,ofs);
nuclear@0 78 pos += ofs;
nuclear@0 79
nuclear@0 80 return cnt;
nuclear@0 81 }
nuclear@0 82
nuclear@0 83 // -------------------------------------------------------------------
nuclear@0 84 // Write to stream
nuclear@0 85 size_t Write(const void* /*pvBuffer*/, size_t /*pSize*/,size_t /*pCount*/) {
nuclear@0 86 ai_assert(false); // won't be needed
nuclear@0 87 return 0;
nuclear@0 88 }
nuclear@0 89
nuclear@0 90 // -------------------------------------------------------------------
nuclear@0 91 // Seek specific position
nuclear@0 92 aiReturn Seek(size_t pOffset, aiOrigin pOrigin) {
nuclear@0 93 if (aiOrigin_SET == pOrigin) {
nuclear@0 94 if (pOffset >= length) {
nuclear@0 95 return AI_FAILURE;
nuclear@0 96 }
nuclear@0 97 pos = pOffset;
nuclear@0 98 }
nuclear@0 99 else if (aiOrigin_END == pOrigin) {
nuclear@0 100 if (pOffset >= length) {
nuclear@0 101 return AI_FAILURE;
nuclear@0 102 }
nuclear@0 103 pos = length-pOffset;
nuclear@0 104 }
nuclear@0 105 else {
nuclear@0 106 if (pOffset+pos >= length) {
nuclear@0 107 return AI_FAILURE;
nuclear@0 108 }
nuclear@0 109 pos += pOffset;
nuclear@0 110 }
nuclear@0 111 return AI_SUCCESS;
nuclear@0 112 }
nuclear@0 113
nuclear@0 114 // -------------------------------------------------------------------
nuclear@0 115 // Get current seek position
nuclear@0 116 size_t Tell() const {
nuclear@0 117 return pos;
nuclear@0 118 }
nuclear@0 119
nuclear@0 120 // -------------------------------------------------------------------
nuclear@0 121 // Get size of file
nuclear@0 122 size_t FileSize() const {
nuclear@0 123 return length;
nuclear@0 124 }
nuclear@0 125
nuclear@0 126 // -------------------------------------------------------------------
nuclear@0 127 // Flush file contents
nuclear@0 128 void Flush() {
nuclear@0 129 ai_assert(false); // won't be needed
nuclear@0 130 }
nuclear@0 131
nuclear@0 132 private:
nuclear@0 133 const uint8_t* buffer;
nuclear@0 134 size_t length,pos;
nuclear@0 135 bool own;
nuclear@0 136 };
nuclear@0 137
nuclear@0 138 // ---------------------------------------------------------------------------
nuclear@0 139 /** Dummy IO system to read from a memory buffer */
nuclear@0 140 class MemoryIOSystem : public IOSystem
nuclear@0 141 {
nuclear@0 142 public:
nuclear@0 143 /** Constructor. */
nuclear@0 144 MemoryIOSystem (const uint8_t* buff, size_t len)
nuclear@0 145 : buffer (buff), length(len) {
nuclear@0 146 }
nuclear@0 147
nuclear@0 148 /** Destructor. */
nuclear@0 149 ~MemoryIOSystem() {
nuclear@0 150 }
nuclear@0 151
nuclear@0 152 // -------------------------------------------------------------------
nuclear@0 153 /** Tests for the existence of a file at the given path. */
nuclear@0 154 bool Exists( const char* pFile) const {
nuclear@0 155 return !strncmp(pFile,AI_MEMORYIO_MAGIC_FILENAME,AI_MEMORYIO_MAGIC_FILENAME_LENGTH);
nuclear@0 156 }
nuclear@0 157
nuclear@0 158 // -------------------------------------------------------------------
nuclear@0 159 /** Returns the directory separator. */
nuclear@0 160 char getOsSeparator() const {
nuclear@0 161 return '/'; // why not? it doesn't care
nuclear@0 162 }
nuclear@0 163
nuclear@0 164 // -------------------------------------------------------------------
nuclear@0 165 /** Open a new file with a given path. */
nuclear@0 166 IOStream* Open( const char* pFile, const char* /*pMode*/ = "rb") {
nuclear@0 167 if (strncmp(pFile,AI_MEMORYIO_MAGIC_FILENAME,AI_MEMORYIO_MAGIC_FILENAME_LENGTH)) {
nuclear@0 168 return NULL;
nuclear@0 169 }
nuclear@0 170 return new MemoryIOStream(buffer,length);
nuclear@0 171 }
nuclear@0 172
nuclear@0 173 // -------------------------------------------------------------------
nuclear@0 174 /** Closes the given file and releases all resources associated with it. */
nuclear@0 175 void Close( IOStream* /*pFile*/) {
nuclear@0 176 }
nuclear@0 177
nuclear@0 178 // -------------------------------------------------------------------
nuclear@0 179 /** Compare two paths */
nuclear@0 180 bool ComparePaths (const char* /*one*/, const char* /*second*/) const {
nuclear@0 181 return false;
nuclear@0 182 }
nuclear@0 183
nuclear@0 184 private:
nuclear@0 185 const uint8_t* buffer;
nuclear@0 186 size_t length;
nuclear@0 187 };
nuclear@0 188 } // end namespace Assimp
nuclear@0 189
nuclear@0 190 #endif