/src/dcmtk/dcmdata/libsrc/dcwcache.cc
Line | Count | Source |
1 | | /* |
2 | | * |
3 | | * Copyright (C) 2007-2010, OFFIS e.V. |
4 | | * All rights reserved. See COPYRIGHT file for details. |
5 | | * |
6 | | * This software and supporting documentation were developed by |
7 | | * |
8 | | * OFFIS e.V. |
9 | | * R&D Division Health |
10 | | * Escherweg 2 |
11 | | * D-26121 Oldenburg, Germany |
12 | | * |
13 | | * |
14 | | * Module: dcmdata |
15 | | * |
16 | | * Author: Marco Eichelberg |
17 | | * |
18 | | * Purpose: Implementation of class DcmWriteCache |
19 | | * |
20 | | */ |
21 | | |
22 | | |
23 | | #include "dcmtk/config/osconfig.h" /* make sure OS specific configuration is included first */ |
24 | | |
25 | | #include "dcmtk/dcmdata/dcwcache.h" /* for class DcmWriteCache */ |
26 | | #include "dcmtk/dcmdata/dcelem.h" /* for class DcmElement */ |
27 | | #include "dcmtk/dcmdata/dcostrma.h" /* for class DcmOutputStream */ |
28 | | |
29 | | |
30 | | void DcmWriteCache::init(void *owner, |
31 | | Uint32 fieldLength, |
32 | | Uint32 bytesTransferred, |
33 | | E_ByteOrder byteOrder) |
34 | 0 | { |
35 | 0 | if (! buf_) |
36 | 0 | { |
37 | 0 | capacity_ = DcmWriteCacheBufsize; |
38 | 0 | buf_ = new Uint8[capacity_]; |
39 | 0 | } |
40 | |
|
41 | 0 | if (owner != owner_) |
42 | 0 | { |
43 | 0 | owner_ = owner; |
44 | 0 | fieldLength_ = fieldLength; |
45 | 0 | fieldOffset_ = bytesTransferred; |
46 | 0 | byteOrder_ = byteOrder; |
47 | 0 | offset_ = 0; |
48 | 0 | numBytes_ = 0; |
49 | 0 | } |
50 | 0 | } |
51 | | |
52 | | OFCondition DcmWriteCache::fillBuffer(DcmElement& elem) |
53 | 0 | { |
54 | 0 | OFCondition result = EC_Normal; |
55 | 0 | if (buf_) |
56 | 0 | { |
57 | | // re-fill the buffer only if completely empty |
58 | 0 | if (! numBytes_) |
59 | 0 | { |
60 | 0 | offset_ = 0; |
61 | | |
62 | | // compute the number of bytes to read - either buffer size or |
63 | | // the remaining number of bytes in the element, whatever is smaller |
64 | 0 | Uint32 bytesToRead = fieldLength_ - fieldOffset_; |
65 | 0 | if (bytesToRead > capacity_) bytesToRead = capacity_; |
66 | |
|
67 | 0 | result = elem.getPartialValue(buf_, fieldOffset_, bytesToRead, &fcache_, byteOrder_); |
68 | |
|
69 | 0 | if (result.good()) |
70 | 0 | { |
71 | 0 | numBytes_ = bytesToRead; |
72 | 0 | fieldOffset_ += numBytes_; |
73 | 0 | } |
74 | |
|
75 | 0 | } |
76 | 0 | } else result = EC_IllegalCall; |
77 | 0 | return result; |
78 | 0 | } |
79 | | |
80 | | Uint32 DcmWriteCache::writeBuffer(DcmOutputStream &outStream) |
81 | 0 | { |
82 | 0 | Uint32 result = 0; |
83 | 0 | if (buf_ && numBytes_) |
84 | 0 | { |
85 | 0 | result = OFstatic_cast(Uint32, outStream.write(buf_ + offset_, numBytes_)); |
86 | |
|
87 | 0 | numBytes_ -= result; |
88 | 0 | offset_ += result; |
89 | 0 | } |
90 | 0 | return result; |
91 | 0 | } |