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1 /*
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2 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "Buffer.hpp"
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26
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27 #include <string.h>
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28
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29 Buffer::Buffer(int bufSize) {
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30 buf = new char[bufSize];
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31 sz = bufSize;
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32 fill = 0;
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33 drain = 0;
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34 }
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35
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36 Buffer::~Buffer() {
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37 delete[] buf;
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38 }
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39
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40 char*
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41 Buffer::fillPos() {
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42 return buf + fill;
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43 }
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44
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45 int
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46 Buffer::remaining() {
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47 return sz - fill;
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48 }
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49
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50 int
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51 Buffer::size() {
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52 return sz;
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53 }
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54
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55 bool
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56 Buffer::incrFillPos(int amt) {
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57 if (fill + amt >= sz) {
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58 return false;
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59 }
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60 fill += amt;
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61 return true;
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62 }
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63
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64 int
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65 Buffer::readByte() {
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66 if (drain < fill) {
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67 return buf[drain++] & 0xFF;
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68 } else {
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69 return -1;
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70 }
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71 }
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72
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73 int
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74 Buffer::readBytes(char* data, int len) {
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75 int numRead = 0;
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76 while (numRead < len) {
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77 int c = readByte();
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78 if (c < 0) break;
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79 data[numRead++] = (char) c;
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80 }
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81 return numRead;
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82 }
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83
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84 char*
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85 Buffer::drainPos() {
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86 return buf + drain;
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87 }
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88
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89 int
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90 Buffer::drainRemaining() {
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91 return fill - drain;
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92 }
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93
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94 bool
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95 Buffer::incrDrainPos(int amt) {
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96 if (drainRemaining() < amt) {
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97 return false;
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98 }
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99 drain += amt;
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100 return true;
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101 }
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102
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103 void
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104 Buffer::compact() {
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105 // Copy down data
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106 memmove(buf, buf + drain, fill - drain);
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107 // Adjust positions
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108 fill -= drain;
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109 drain = 0;
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110 }
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