1 /*
2 Source File : PDFStream.cpp
3
4
5 Copyright 2011 Gal Kahana PDFWriter
6
7 Licensed under the Apache License, Version 2.0 (the "License");
8 you may not use this file except in compliance with the License.
9 You may obtain a copy of the License at
10
11 http://www.apache.org/licenses/LICENSE-2.0
12
13 Unless required by applicable law or agreed to in writing, software
14 distributed under the License is distributed on an "AS IS" BASIS,
15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 See the License for the specific language governing permissions and
17 limitations under the License.
18
19
20 */
21 #include "PDFStream.h"
22 #include "IObjectsContextExtender.h"
23 #include "InputStringBufferStream.h"
24 #include "OutputStreamTraits.h"
25
PDFStream(bool inCompressStream,IByteWriterWithPosition * inOutputStream,ObjectIDType inExtentObjectID,IObjectsContextExtender * inObjectsContextExtender)26 PDFStream::PDFStream(bool inCompressStream,
27 IByteWriterWithPosition* inOutputStream,
28 ObjectIDType inExtentObjectID,
29 IObjectsContextExtender* inObjectsContextExtender)
30 {
31 mExtender = inObjectsContextExtender;
32 mCompressStream = inCompressStream;
33 mExtendObjectID = inExtentObjectID;
34 mStreamStartPosition = inOutputStream->GetCurrentPosition();
35 mOutputStream = inOutputStream;
36 mStreamLength = 0;
37 mStreamDictionaryContextForDirectExtentStream = NULL;
38
39
40 if(mCompressStream)
41 {
42 if(mExtender && mExtender->OverridesStreamCompression())
43 {
44 mWriteStream = mExtender->GetCompressionWriteStream(inOutputStream);
45 }
46 else
47 {
48 mFlateEncodingStream.Assign(inOutputStream);
49 mWriteStream = &mFlateEncodingStream;
50 }
51 }
52 else
53 mWriteStream = inOutputStream;
54
55 }
56
PDFStream(bool inCompressStream,IByteWriterWithPosition * inOutputStream,DictionaryContext * inStreamDictionaryContextForDirectExtentStream,IObjectsContextExtender * inObjectsContextExtender)57 PDFStream::PDFStream(
58 bool inCompressStream,
59 IByteWriterWithPosition* inOutputStream,
60 DictionaryContext* inStreamDictionaryContextForDirectExtentStream,
61 IObjectsContextExtender* inObjectsContextExtender)
62 {
63 mExtender = inObjectsContextExtender;
64 mCompressStream = inCompressStream;
65 mExtendObjectID = 0;
66 mStreamStartPosition = 0;
67 mOutputStream = inOutputStream;
68 mStreamLength = 0;
69 mStreamDictionaryContextForDirectExtentStream = inStreamDictionaryContextForDirectExtentStream;
70
71 mTemporaryOutputStream.Assign(&mTemporaryStream);
72
73 if(mCompressStream)
74 {
75 if(mExtender && mExtender->OverridesStreamCompression())
76 {
77 mWriteStream = mExtender->GetCompressionWriteStream(&mTemporaryOutputStream);
78 }
79 else
80 {
81 mFlateEncodingStream.Assign(&mTemporaryOutputStream);
82 mWriteStream = &mFlateEncodingStream;
83 }
84 }
85 else
86 mWriteStream = &mTemporaryOutputStream;
87
88 }
89
90
~PDFStream(void)91 PDFStream::~PDFStream(void)
92 {
93
94 }
95
GetWriteStream()96 IByteWriter* PDFStream::GetWriteStream()
97 {
98 return mWriteStream;
99 }
100
FinalizeStreamWrite()101 void PDFStream::FinalizeStreamWrite()
102 {
103 if(mExtender && mExtender->OverridesStreamCompression() && mCompressStream)
104 mExtender->FinalizeCompressedStreamWrite(mWriteStream);
105 mWriteStream = NULL;
106 if(mCompressStream)
107 mFlateEncodingStream.Assign(NULL); // this both finished encoding any left buffers and releases ownership from mFlateEncodingStream
108
109 // different endings, depending if direct stream writing or not
110 if(mExtendObjectID == 0)
111 {
112 mStreamLength = mTemporaryStream.GetCurrentWritePosition();
113 }
114 else
115 {
116 mStreamLength = mOutputStream->GetCurrentPosition()-mStreamStartPosition;
117 mOutputStream = NULL;
118 }
119 }
120
GetLength()121 LongFilePositionType PDFStream::GetLength()
122 {
123 return mStreamLength;
124 }
125
IsStreamCompressed()126 bool PDFStream::IsStreamCompressed()
127 {
128 return mCompressStream;
129 }
130
GetExtentObjectID()131 ObjectIDType PDFStream::GetExtentObjectID()
132 {
133 return mExtendObjectID;
134 }
135
GetStreamDictionaryForDirectExtentStream()136 DictionaryContext* PDFStream::GetStreamDictionaryForDirectExtentStream()
137 {
138 return mStreamDictionaryContextForDirectExtentStream;
139 }
140
FlushStreamContentForDirectExtentStream()141 void PDFStream::FlushStreamContentForDirectExtentStream()
142 {
143 mTemporaryStream.pubseekoff(0,std::ios_base::beg);
144
145 // copy internal temporary stream to output
146 InputStringBufferStream inputStreamForWrite(&mTemporaryStream);
147 OutputStreamTraits streamCopier(mOutputStream);
148 streamCopier.CopyToOutputStream(&inputStreamForWrite);
149
150 mTemporaryStream.str();
151 mOutputStream = NULL;
152 }
153
154