hotspot/agent/src/os/win32/Buffer.cpp
changeset 1 489c9b5090e2
child 5547 f4b087cbb361
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0:fd16c54261b3 1:489c9b5090e2
       
     1 /*
       
     2  * Copyright 2001 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
       
    20  * CA 95054 USA or visit www.sun.com if you need additional information or
       
    21  * have any questions.
       
    22  *
       
    23  */
       
    24 
       
    25 #include "Buffer.hpp"
       
    26 
       
    27 #include <string.h>
       
    28 
       
    29 Buffer::Buffer(int bufSize) {
       
    30   buf = new char[bufSize];
       
    31   sz = bufSize;
       
    32   fill = 0;
       
    33   drain = 0;
       
    34 }
       
    35 
       
    36 Buffer::~Buffer() {
       
    37   delete[] buf;
       
    38 }
       
    39 
       
    40 char*
       
    41 Buffer::fillPos() {
       
    42   return buf + fill;
       
    43 }
       
    44 
       
    45 int
       
    46 Buffer::remaining() {
       
    47   return sz - fill;
       
    48 }
       
    49 
       
    50 int
       
    51 Buffer::size() {
       
    52   return sz;
       
    53 }
       
    54 
       
    55 bool
       
    56 Buffer::incrFillPos(int amt) {
       
    57   if (fill + amt >= sz) {
       
    58     return false;
       
    59   }
       
    60   fill += amt;
       
    61   return true;
       
    62 }
       
    63 
       
    64 int
       
    65 Buffer::readByte() {
       
    66   if (drain < fill) {
       
    67     return buf[drain++] & 0xFF;
       
    68   } else {
       
    69     return -1;
       
    70   }
       
    71 }
       
    72 
       
    73 int
       
    74 Buffer::readBytes(char* data, int len) {
       
    75   int numRead = 0;
       
    76   while (numRead < len) {
       
    77     int c = readByte();
       
    78     if (c < 0) break;
       
    79     data[numRead++] = (char) c;
       
    80   }
       
    81   return numRead;
       
    82 }
       
    83 
       
    84 char*
       
    85 Buffer::drainPos() {
       
    86   return buf + drain;
       
    87 }
       
    88 
       
    89 int
       
    90 Buffer::drainRemaining() {
       
    91   return fill - drain;
       
    92 }
       
    93 
       
    94 bool
       
    95 Buffer::incrDrainPos(int amt) {
       
    96   if (drainRemaining() < amt) {
       
    97     return false;
       
    98   }
       
    99   drain += amt;
       
   100   return true;
       
   101 }
       
   102 
       
   103 void
       
   104 Buffer::compact() {
       
   105   // Copy down data
       
   106   memmove(buf, buf + drain, fill - drain);
       
   107   // Adjust positions
       
   108   fill -= drain;
       
   109   drain = 0;
       
   110 }