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CORBA::Octet * buf; buf = new CORBA::Octet[stst_size]; read(fd, buf, stst_size); BinaryFile image_seq(stst_size); image_seqlength(stst_size); // Fill sequence for (off_t i = 0; i < stst_size; i++) image_seq[i] = buf[i]; delete[] buf; close(fd); // Send octet sequence to server
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// Allocate file buffer // Read file contents // Create octet sequence // Set length of sequence
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// Don't need buffer anymore // Done with file
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The image file might be several hundred kilobytes long, but the preceding code copies the file contents into the octet sequence one byte at a time Even if the sequence's subscript operator is inlined, this approach is still massively inefficient We can avoid this problem by using the data constructor:
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// Open file and get attributes as before CORBA::Octet * buf; buf = new CORBA::Octet[stst_size]; // Allocate file buffer read(fd, buf, stst_size); // Read file contents close(fd); // Done with file // Initialize sequence with buffer just read BinaryFile image_seq(stst_size, stst_size, buf, 0); // Send octet sequence to server delete[] buf; // Deallocate buffer
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The interesting line here is the call to the data constructor:
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BinaryFile image_seq(stst_size, stst_size, buf, 0);
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This call initializes both the maximum and the length of the sequence to the size of the file, passes a pointer to the buffer, and sets the release flag to false The sequence now uses the passed buffer for its internal storage, thereby avoiding the cost of initializing the sequence one byte at a time Setting the release flag to false indicates that we want to retain responsibility for memory management of the buffer The sequence does not deallocate the buffer contents Instead, the preceding code does this explicitly by calling delete [] when the sequence contents are no longer needed
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If you set the release flag to true, the sequence takes ownership of the passed buffer In that case, the buffer must have been allocated with allocbuf, and the sequence deallocates the buffer with freebuf:
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// Open file and get attributes as before CORBA::Octet * buf; buf = BinaryFile::allocbuf(stst_size); // Allocate file buffer read(fd, buf, stst_size); // Read file contents // Initialize, sequence takes ownership BinaryFile image_seq(stst_size, stst_size, buf, 1); close(fd); // Send octet sequence to server // No need to deallocate buf here, the sequence // will deallocate it with BinaryFile::freebuf() // Done with file
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The allocbuf and freebuf member functions are provided to deal with non-uniform memory architectures (for uniform architectures, they are simply implemented in terms of new [] and delete []) The allocbuf function returns a null pointer if it fails to allocate memory (it does not throw C++ or CORBA exceptions) It is legal to call freebuf with a null pointer If you initialize a sequence with release set to true as shown earlier, you cannot make assumptions about the lifetime of the passed buffer For example, a compliant (although inefficient) implementation may decide to immediately copy the sequence and deallocate the buffer This means that after you have handed the buffer to the sequence, the buffer becomes private memory that is completely out of your control If the release flag is true and the sequence elements are strings, the sequence will release memory for the strings when it deallocates the buffer Similarly, if the release flag is true and the sequence elements are object references, the sequence will call CORBA::release on each reference String elements are deallocated by a call to CORBA::string_free, so you must allocate them with CORBA::string_alloc The following example shows use of a sequence of strings with the release flag set to true The code reads lines of text from a file, making each line a sequence element Again, for brevity, we have not included any error handling (The code also causes lines longer than 512 characters to be split, which we will assume is acceptable)
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char linebuf[512]; CORBA::ULong len = 0; CORBA::ULong max = 64; char ** strvec = StrSeq::allocbuf(max); ifstream infile("filetxt"); // Line buffer // // // // Current sequence length Initial sequence max Allocate initial chunk Open input file
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