summaryrefslogtreecommitdiff
path: root/connectivity/source/drivers/jdbc/Reader.cxx
blob: 5f49db97f05bc66c9d67fcce8c5a398b63471daa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <java/io/Reader.hxx>
#include <string.h>
using namespace connectivity;
using ::com::sun::star::uno::Sequence;


//************ Class: java.io.Reader


jclass java_io_Reader::theClass = nullptr;
java_io_Reader::java_io_Reader( JNIEnv * pEnv, jobject myObj )
    : java_lang_Object( pEnv, myObj )
{
    SDBThreadAttach::addRef();
}
java_io_Reader::~java_io_Reader()
{
    SDBThreadAttach::releaseRef();
}

jclass java_io_Reader::getMyClass() const
{
    // the class must be fetched only once, therefore static
    if( !theClass )
        theClass = findMyClass("java/io/Reader");
    return theClass;
}

sal_Int32 SAL_CALL java_io_Reader::readSomeBytes( css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead )
{
    return readBytes(aData,nMaxBytesToRead);
}

void SAL_CALL java_io_Reader::skipBytes( sal_Int32 nBytesToSkip )
{
    static jmethodID mID(nullptr);
    if(nBytesToSkip <= 0)
        return;

    if(m_buf)
    {
        m_buf.reset();
        --nBytesToSkip;
    }

    static_assert(sizeof(jchar) == 2, "I thought Java characters were UTF16 code units?");
    sal_Int32 nCharsToSkip = nBytesToSkip / sizeof(jchar);
    callIntMethodWithIntArg_ThrowRuntime("skip",mID,nCharsToSkip);
    if(nBytesToSkip % sizeof(jchar) != 0)
    {
        assert(nBytesToSkip % sizeof(jchar) == 1);
        Sequence< sal_Int8 > aData(1);
        assert(m_buf);
        readBytes(aData, 1);
    }
}

sal_Int32 SAL_CALL java_io_Reader::available(  )
{
    if(m_buf)
        return 1;
    bool out;
    SDBThreadAttach t; OSL_ENSURE(t.pEnv,"Java environment has been deleted!");

    {
        static const char * const cSignature = "()Z";
        static const char * const cMethodName = "ready";
        // Java-Call
        static jmethodID mID(nullptr);
        obtainMethodId_throwRuntime(t.pEnv, cMethodName,cSignature, mID);
        out = t.pEnv->CallBooleanMethod( object, mID);
        ThrowRuntimeException(t.pEnv,*this);
    } //t.pEnv
    return (m_buf ? 1 : 0) + (out ? 1 : 0); // no way to tell *how much* is ready
}

void SAL_CALL java_io_Reader::closeInput(  )
{
    static jmethodID mID(nullptr);
    callVoidMethod_ThrowRuntime("close", mID);
}

sal_Int32 SAL_CALL java_io_Reader::readBytes( css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead )
{
    OSL_ENSURE(aData.getLength() >= nBytesToRead," Sequence is smaller than BytesToRead");

    if(nBytesToRead == 0)
        return 0;

    sal_Int8 *dst(aData.getArray());
    sal_Int32 nBytesWritten(0);

    if (m_buf)
    {
        if(!aData.hasElements())
        {
            aData.realloc(1);
            dst = aData.getArray();
        }
        *dst = *m_buf;
        m_buf.reset();
        ++nBytesWritten;
        ++dst;
        --nBytesToRead;
    }

    if(nBytesToRead == 0)
        return nBytesWritten;

    sal_Int32 nCharsToRead = (nBytesToRead + 1)/2;

    jint outChars(0);
    SDBThreadAttach t; OSL_ENSURE(t.pEnv,"Java environment has been deleted!");

    {
        jcharArray pCharArray = t.pEnv->NewCharArray(nCharsToRead);
        static const char * const cSignature = "([CII)I";
        static const char * const cMethodName = "read";
        // Java-Call
        static jmethodID mID(nullptr);
        obtainMethodId_throwRuntime(t.pEnv, cMethodName,cSignature, mID);
        outChars = t.pEnv->CallIntMethod( object, mID, pCharArray, 0, nCharsToRead );
        if ( !outChars )
        {
            if(nBytesWritten==0)
                ThrowRuntimeException(t.pEnv,*this);
            else
                return 1;
        }
        if(outChars > 0)
        {
            static_assert(sizeof(jchar) == 2, "I thought Java characters were UTF16 code units?");
            const sal_Int32 jcs = sizeof(jchar);
            const sal_Int32 outBytes = std::min(nBytesToRead, outChars*jcs);
            assert(outBytes == outChars*jcs || outBytes == outChars*jcs - 1);

            jboolean p = JNI_FALSE;
            if(aData.getLength() < nBytesWritten + outBytes)
            {
                aData.realloc(nBytesWritten + outBytes);
                dst = aData.getArray() + nBytesWritten;
            }
            jchar *outBuf(t.pEnv->GetCharArrayElements(pCharArray,&p));

            memcpy(dst, outBuf, outBytes);
            nBytesWritten += outBytes;
            if(outBytes < outChars*jcs)
            {
                assert(outChars*jcs - outBytes == 1);
                assert(!m_buf);
                m_buf = reinterpret_cast<char*>(outBuf)[outBytes];
            }
        }
        t.pEnv->DeleteLocalRef(pCharArray);
    } //t.pEnv
    return nBytesWritten;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */