| 提交 | 用户 | 时间 | ||
| 149dd0 | 1 | package com.iailab.netsdk.lib; |
| H | 2 | |
| 3 | import java.io.UnsupportedEncodingException; | |
| 4 | import java.nio.CharBuffer; | |
| 5 | ||
| 6 | import com.sun.jna.Memory; | |
| 7 | import com.sun.jna.Native; | |
| 8 | import com.sun.jna.Pointer; | |
| 9 | ||
| 10 | ||
| 11 | /** Provides a temporary allocation of an immutable C string | |
| 12 | * (<code>const char*</code> or <code>const wchar_t*</code>) for use when | |
| 13 | * converting a Java String into a native memory function argument. | |
| 14 | * | |
| 15 | * @author Todd Fast, todd.fast@sun.com | |
| 16 | * @author twall@users.sf.net | |
| 17 | */ | |
| 18 | public class NativeString implements CharSequence, Comparable<Object> { | |
| 19 | ||
| 20 | private Pointer pointer; | |
| 21 | private boolean wide; | |
| 22 | ||
| 23 | /** Create a native string (NUL-terminated array of <code>char</code>).<p> | |
| 24 | * If the system property <code>jna.encoding</code> is set, its value will | |
| 25 | * be used to encode the native string. If not set or if the encoding | |
| 26 | * is unavailable, the default platform encoding will be used. | |
| 27 | */ | |
| 28 | public NativeString(String string) { | |
| 29 | this(string, false); | |
| 30 | } | |
| 31 | ||
| 32 | /** Create a native string as a NUL-terminated array of <code>wchar_t</code> | |
| 33 | * (if <code>wide</code> is true) or <code>char</code>.<p> | |
| 34 | * If the system property <code>jna.encoding</code> is set, its value will | |
| 35 | * be used to encode the native <code>char</code>string. | |
| 36 | * If not set or if the encoding is unavailable, the default platform | |
| 37 | * encoding will be used. | |
| 38 | * | |
| 39 | * @param string value to write to native memory | |
| 40 | * @param wide whether to store the String as <code>wchar_t</code> | |
| 41 | */ | |
| 42 | public NativeString(String string, boolean wide) { | |
| 43 | if (string == null) { | |
| 44 | throw new NullPointerException("String must not be null"); | |
| 45 | } | |
| 46 | // Allocate the memory to hold the string. Note, we have to | |
| 47 | // make this 1 element longer in order to accommodate the terminating | |
| 48 | // NUL (which is generated in Pointer.setString()). | |
| 49 | this.wide = wide; | |
| 50 | if (wide) { | |
| 51 | int len = (string.length() + 1 ) * Native.WCHAR_SIZE; | |
| 52 | pointer = new Memory(len); | |
| 53 | pointer.setString(0, string); | |
| 54 | } | |
| 55 | else { | |
| 56 | byte[] data = getBytes(string); | |
| 57 | pointer = new Memory(data.length + 1); | |
| 58 | pointer.write(0, data, 0, data.length); | |
| 59 | pointer.setByte(data.length, (byte)0); | |
| 60 | } | |
| 61 | } | |
| 62 | ||
| 63 | static byte[] getBytes(String s) { | |
| 64 | try { | |
| 65 | return getBytes(s, System.getProperty("jna.encoding")); | |
| 66 | } | |
| 67 | catch (UnsupportedEncodingException e) { | |
| 68 | return s.getBytes(); | |
| 69 | } | |
| 70 | } | |
| 71 | ||
| 72 | /** Return a byte array corresponding to the given String, using the given | |
| 73 | encoding. | |
| 74 | */ | |
| 75 | static byte[] getBytes(String s, String encoding) throws UnsupportedEncodingException { | |
| 76 | if (encoding != null) { | |
| 77 | return s.getBytes(encoding); | |
| 78 | } | |
| 79 | return s.getBytes(); | |
| 80 | } | |
| 81 | ||
| 82 | public int hashCode() { | |
| 83 | return toString().hashCode(); | |
| 84 | } | |
| 85 | ||
| 86 | public boolean equals(Object other) { | |
| 87 | ||
| 88 | if (other instanceof CharSequence) { | |
| 89 | return compareTo(other) == 0; | |
| 90 | } | |
| 91 | return false; | |
| 92 | } | |
| 93 | ||
| 94 | public String toString() { | |
| 95 | String s = wide ? "const wchar_t*" : "const char*"; | |
| 96 | s += "(" + pointer.getString(0) + ")"; | |
| 97 | return s; | |
| 98 | } | |
| 99 | ||
| 100 | public Pointer getPointer() { | |
| 101 | return pointer; | |
| 102 | } | |
| 103 | ||
| 104 | public char charAt(int index) { | |
| 105 | return toString().charAt(index); | |
| 106 | } | |
| 107 | ||
| 108 | public int length() { | |
| 109 | return toString().length(); | |
| 110 | } | |
| 111 | ||
| 112 | public CharSequence subSequence(int start, int end) { | |
| 113 | return CharBuffer.wrap(toString()).subSequence(start, end); | |
| 114 | } | |
| 115 | ||
| 116 | public int compareTo(Object other) { | |
| 117 | ||
| 118 | if (other == null) | |
| 119 | return 1; | |
| 120 | ||
| 121 | return toString().compareTo(other.toString()); | |
| 122 | } | |
| 123 | } | |
| 124 | ||
