filebuff.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25// FILEBUFF.HPP - Definitions for parser file buffering routines 26#include <iostream> 27 28using namespace std; 29 30// STRUCTURE FOR HANDLING INPUT AND OUTPUT FILES 31typedef struct { 32 const char *_name; 33 FILE *_fp; 34} BufferedFile; 35 36class ArchDesc; 37 38//------------------------------FileBuff-------------------------------------- 39// This class defines a nicely behaved buffer of text. Entire file of text 40// is read into buffer at creation, with sentinels at start and end. 41class FileBuff { 42 friend class FileBuffRegion; 43 private: 44 long _bufferSize; // Size of text holding buffer. 45 long _offset; // Expected filepointer offset. 46 long _bufoff; // Start of buffer file offset 47 48 char *_buf; // The buffer itself. 49 char *_bigbuf; // The buffer plus sentinels; actual heap area 50 char *_bufmax; // A pointer to the buffer end sentinel 51 char *_bufeol; // A pointer to the last complete line end 52 53 int _err; // Error flag for file seek/read operations 54 long _filepos; // Current offset from start of file 55 int _linenum; 56 57 ArchDesc& _AD; // Reference to Architecture Description 58 59 // Error reporting function 60 void file_error(int flag, int linenum, const char *fmt, ...); 61 62 public: 63 const BufferedFile *_fp; // File to be buffered 64 65 FileBuff(BufferedFile *fp, ArchDesc& archDesc); // Constructor 66 ~FileBuff(); // Destructor 67 68 // This returns a pointer to the start of the current line in the buffer, 69 // and increments bufeol and filepos to point at the end of that line. 70 char *get_line(void); 71 int linenum() const { return _linenum; } 72 void set_linenum(int line) { _linenum = line; } 73 74 // This converts a pointer into the buffer to a file offset. It only works 75 // when the pointer is valid (i.e. just obtained from getline()). 76 long getoff(const char* s) { return _bufoff + (long)(s - _buf); } 77}; 78 79//------------------------------FileBuffRegion--------------------------------- 80// A buffer region is really a region of some file, specified as a linked list 81// of offsets and lengths. These regions can be merged; overlapping regions 82// will coalesce. 83class FileBuffRegion { 84 public: // Workaround dev-studio friend/private bug 85 FileBuffRegion *_next; // Linked list of regions sorted by offset. 86 private: 87 FileBuff *_bfr; // The Buffer of the file 88 int _offset, _length; // The file area 89 int _sol; // Start of line where the file area starts 90 int _line; // First line of region 91 92 public: 93 FileBuffRegion(FileBuff*, int sol, int line, int offset, int len); 94 ~FileBuffRegion(); 95 96 FileBuffRegion *copy(); // Deep copy 97 FileBuffRegion *merge(FileBuffRegion*); // Merge 2 regions; delete input 98 99 void print(ostream&); 100 friend ostream& operator<< (ostream&, FileBuffRegion&); 101}; 102