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1 /*
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2 * Copyright 1997-2005 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 // Simple interface for filing out and filing in basic types
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26 // Used for writing out and reading in debugging information.
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27
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28 class CompressedStream : public ResourceObj {
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29 friend class VMStructs;
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30 protected:
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31 u_char* _buffer;
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32 int _position;
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33
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34 enum {
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35 // Constants for UNSIGNED5 coding of Pack200
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36 lg_H = 6, H = 1<<lg_H, // number of high codes (64)
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37 L = (1<<BitsPerByte)-H, // number of low codes (192)
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38 MAX_i = 4 // bytes are numbered in (0..4), max 5 bytes
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39 };
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40
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41 // these inlines are defined only in compressedStream.cpp
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42 static inline juint encode_sign(jint value); // for Pack200 SIGNED5
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43 static inline jint decode_sign(juint value); // for Pack200 SIGNED5
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44 static inline juint reverse_int(juint bits); // to trim trailing float 0's
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45
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46 public:
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47 CompressedStream(u_char* buffer, int position = 0) {
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48 _buffer = buffer;
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49 _position = position;
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50 }
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51
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52 u_char* buffer() const { return _buffer; }
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53
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54 // Positioning
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55 int position() const { return _position; }
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56 void set_position(int position) { _position = position; }
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57 };
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58
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59
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60 class CompressedReadStream : public CompressedStream {
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61 private:
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62 inline u_char read() { return _buffer[_position++]; }
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63
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64 jint read_int_mb(jint b0); // UNSIGNED5 coding, 2-5 byte cases
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65
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66 public:
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67 CompressedReadStream(u_char* buffer, int position = 0)
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68 : CompressedStream(buffer, position) {}
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69
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70 jboolean read_bool() { return (jboolean) read(); }
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71 jbyte read_byte() { return (jbyte ) read(); }
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72 jchar read_char() { return (jchar ) read_int(); }
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73 jshort read_short() { return (jshort ) read_signed_int(); }
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74 jint read_int() { jint b0 = read();
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75 if (b0 < L) return b0;
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76 else return read_int_mb(b0);
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77 }
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78 jint read_signed_int();
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79 jfloat read_float(); // jfloat_cast(reverse_int(read_int()))
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80 jdouble read_double(); // jdouble_cast(2*reverse_int(read_int))
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81 jlong read_long(); // jlong_from(2*read_signed_int())
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82 };
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83
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84
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85 class CompressedWriteStream : public CompressedStream {
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86 private:
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87 bool full() {
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88 return _position >= _size;
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89 }
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90 void store(u_char b) {
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91 _buffer[_position++] = b;
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92 }
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93 void write(u_char b) {
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94 if (full()) grow();
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95 store(b);
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96 }
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97 void grow();
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98
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99 void write_int_mb(jint value); // UNSIGNED5 coding, 1-5 byte cases
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100
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101 protected:
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102 int _size;
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103
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104 public:
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105 CompressedWriteStream(int initial_size);
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106 CompressedWriteStream(u_char* buffer, int initial_size, int position = 0)
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107 : CompressedStream(buffer, position) { _size = initial_size; }
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108
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109 void write_bool(jboolean value) { write(value); }
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110 void write_byte(jbyte value) { write(value); }
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111 void write_char(jchar value) { write_int(value); }
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112 void write_short(jshort value) { write_signed_int(value); }
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113 void write_int(jint value) { if ((juint)value < L && !full())
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114 store((u_char)value);
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115 else write_int_mb(value); }
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116 void write_signed_int(jint value); // write_int(encode_sign(value))
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117 void write_float(jfloat value); // write_int(reverse_int(jint_cast(v)))
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118 void write_double(jdouble value); // write_int(reverse_int(<low,high>))
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119 void write_long(jlong value); // write_signed_int(<low,high>)
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120 };
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