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1 | (* |
2 | * Licensed to the Apache Software Foundation (ASF) under one | |
3 | * or more contributor license agreements. See the NOTICE file | |
4 | * distributed with this work for additional information | |
5 | * regarding copyright ownership. The ASF licenses this file | |
6 | * to you under the Apache License, Version 2.0 (the | |
7 | * "License"); you may not use this file except in compliance | |
8 | * with the License. You may obtain a copy of the License at | |
9 | * | |
10 | * http://www.apache.org/licenses/LICENSE-2.0 | |
11 | * | |
12 | * Unless required by applicable law or agreed to in writing, | |
13 | * software distributed under the License is distributed on an | |
14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
15 | * KIND, either express or implied. See the License for the | |
16 | * specific language governing permissions and limitations | |
17 | * under the License. | |
18 | *) | |
19 | ||
20 | unit Thrift.Stream; | |
21 | ||
22 | {$I Thrift.Defines.inc} | |
23 | ||
24 | interface | |
25 | ||
26 | uses | |
27 | Classes, | |
28 | SysUtils, | |
29 | SysConst, | |
30 | RTLConsts, | |
31 | {$IFDEF OLD_UNIT_NAMES} | |
32 | ActiveX, | |
33 | {$ELSE} | |
34 | Winapi.ActiveX, | |
35 | {$ENDIF} | |
36 | Thrift.Utils; | |
37 | ||
38 | type | |
39 | ||
40 | IThriftStream = interface | |
41 | ['{2A77D916-7446-46C1-8545-0AEC0008DBCA}'] | |
42 | procedure Write( const buffer: TBytes; offset: Integer; count: Integer); overload; | |
43 | procedure Write( const pBuf : Pointer; offset: Integer; count: Integer); overload; | |
44 | function Read( var buffer: TBytes; offset: Integer; count: Integer): Integer; overload; | |
45 | function Read( const pBuf : Pointer; const buflen : Integer; offset: Integer; count: Integer): Integer; overload; | |
46 | procedure Open; | |
47 | procedure Close; | |
48 | procedure Flush; | |
49 | function IsOpen: Boolean; | |
50 | function ToArray: TBytes; | |
51 | end; | |
52 | ||
53 | TThriftStreamImpl = class( TInterfacedObject, IThriftStream) | |
54 | private | |
55 | procedure CheckSizeAndOffset( const pBuf : Pointer; const buflen : Integer; offset: Integer; count: Integer); overload; | |
56 | protected | |
57 | procedure Write( const buffer: TBytes; offset: Integer; count: Integer); overload; inline; | |
58 | procedure Write( const pBuf : Pointer; offset: Integer; count: Integer); overload; virtual; | |
59 | function Read( var buffer: TBytes; offset: Integer; count: Integer): Integer; overload; inline; | |
60 | function Read( const pBuf : Pointer; const buflen : Integer; offset: Integer; count: Integer): Integer; overload; virtual; | |
61 | procedure Open; virtual; abstract; | |
62 | procedure Close; virtual; abstract; | |
63 | procedure Flush; virtual; abstract; | |
64 | function IsOpen: Boolean; virtual; abstract; | |
65 | function ToArray: TBytes; virtual; abstract; | |
66 | end; | |
67 | ||
68 | TThriftStreamAdapterDelphi = class( TThriftStreamImpl ) | |
69 | private | |
70 | FStream : TStream; | |
71 | FOwnsStream : Boolean; | |
72 | protected | |
73 | procedure Write( const pBuf : Pointer; offset: Integer; count: Integer); override; | |
74 | function Read( const pBuf : Pointer; const buflen : Integer; offset: Integer; count: Integer): Integer; override; | |
75 | procedure Open; override; | |
76 | procedure Close; override; | |
77 | procedure Flush; override; | |
78 | function IsOpen: Boolean; override; | |
79 | function ToArray: TBytes; override; | |
80 | public | |
81 | constructor Create( const AStream: TStream; AOwnsStream : Boolean); | |
82 | destructor Destroy; override; | |
83 | end; | |
84 | ||
85 | TThriftStreamAdapterCOM = class( TThriftStreamImpl) | |
86 | private | |
87 | FStream : IStream; | |
88 | protected | |
89 | procedure Write( const pBuf : Pointer; offset: Integer; count: Integer); override; | |
90 | function Read( const pBuf : Pointer; const buflen : Integer; offset: Integer; count: Integer): Integer; override; | |
91 | procedure Open; override; | |
92 | procedure Close; override; | |
93 | procedure Flush; override; | |
94 | function IsOpen: Boolean; override; | |
95 | function ToArray: TBytes; override; | |
96 | public | |
97 | constructor Create( const AStream: IStream); | |
98 | end; | |
99 | ||
100 | implementation | |
101 | ||
102 | { TThriftStreamAdapterCOM } | |
103 | ||
104 | procedure TThriftStreamAdapterCOM.Close; | |
105 | begin | |
106 | FStream := nil; | |
107 | end; | |
108 | ||
109 | constructor TThriftStreamAdapterCOM.Create( const AStream: IStream); | |
110 | begin | |
111 | inherited Create; | |
112 | FStream := AStream; | |
113 | end; | |
114 | ||
115 | procedure TThriftStreamAdapterCOM.Flush; | |
116 | begin | |
117 | if IsOpen then begin | |
118 | if FStream <> nil then begin | |
119 | FStream.Commit( STGC_DEFAULT ); | |
120 | end; | |
121 | end; | |
122 | end; | |
123 | ||
124 | function TThriftStreamAdapterCOM.IsOpen: Boolean; | |
125 | begin | |
126 | Result := FStream <> nil; | |
127 | end; | |
128 | ||
129 | procedure TThriftStreamAdapterCOM.Open; | |
130 | begin | |
131 | // nothing to do | |
132 | end; | |
133 | ||
134 | function TThriftStreamAdapterCOM.Read( const pBuf : Pointer; const buflen : Integer; offset: Integer; count: Integer): Integer; | |
135 | var pTmp : PByte; | |
136 | begin | |
137 | inherited; | |
138 | ||
139 | if count >= buflen-offset | |
140 | then count := buflen-offset; | |
141 | ||
142 | Result := 0; | |
143 | if FStream <> nil then begin | |
144 | if count > 0 then begin | |
145 | pTmp := pBuf; | |
146 | Inc( pTmp, offset); | |
147 | FStream.Read( pTmp, count, @Result); | |
148 | end; | |
149 | end; | |
150 | end; | |
151 | ||
152 | function TThriftStreamAdapterCOM.ToArray: TBytes; | |
153 | var | |
154 | statstg: TStatStg; | |
155 | len : Integer; | |
156 | NewPos : {$IF CompilerVersion >= 29.0} UInt64 {$ELSE} Int64 {$IFEND}; | |
157 | cbRead : Integer; | |
158 | begin | |
159 | FillChar( statstg, SizeOf( statstg), 0); | |
160 | len := 0; | |
161 | if IsOpen then begin | |
162 | if Succeeded( FStream.Stat( statstg, STATFLAG_NONAME )) then begin | |
163 | len := statstg.cbSize; | |
164 | end; | |
165 | end; | |
166 | ||
167 | SetLength( Result, len ); | |
168 | ||
169 | if len > 0 then begin | |
170 | if Succeeded( FStream.Seek( 0, STREAM_SEEK_SET, NewPos) ) then begin | |
171 | FStream.Read( @Result[0], len, @cbRead); | |
172 | end; | |
173 | end; | |
174 | end; | |
175 | ||
176 | procedure TThriftStreamAdapterCOM.Write( const pBuf: Pointer; offset: Integer; count: Integer); | |
177 | var nWritten : Integer; | |
178 | pTmp : PByte; | |
179 | begin | |
180 | inherited; | |
181 | if IsOpen then begin | |
182 | if count > 0 then begin | |
183 | pTmp := pBuf; | |
184 | Inc( pTmp, offset); | |
185 | FStream.Write( pTmp, count, @nWritten); | |
186 | end; | |
187 | end; | |
188 | end; | |
189 | ||
190 | { TThriftStreamImpl } | |
191 | ||
192 | procedure TThriftStreamImpl.CheckSizeAndOffset( const pBuf : Pointer; const buflen : Integer; offset: Integer; count: Integer); | |
193 | begin | |
194 | if count > 0 then begin | |
195 | if (offset < 0) or ( offset >= buflen) then begin | |
196 | raise ERangeError.Create( SBitsIndexError ); | |
197 | end; | |
198 | if count > buflen then begin | |
199 | raise ERangeError.Create( SBitsIndexError ); | |
200 | end; | |
201 | end; | |
202 | end; | |
203 | ||
204 | function TThriftStreamImpl.Read(var buffer: TBytes; offset, count: Integer): Integer; | |
205 | begin | |
206 | if Length(buffer) > 0 | |
207 | then Result := Read( @buffer[0], Length(buffer), offset, count) | |
208 | else Result := 0; | |
209 | end; | |
210 | ||
211 | function TThriftStreamImpl.Read( const pBuf : Pointer; const buflen : Integer; offset: Integer; count: Integer): Integer; | |
212 | begin | |
213 | Result := 0; | |
214 | CheckSizeAndOffset( pBuf, buflen, offset, count ); | |
215 | end; | |
216 | ||
217 | procedure TThriftStreamImpl.Write(const buffer: TBytes; offset, count: Integer); | |
218 | begin | |
219 | if Length(buffer) > 0 | |
220 | then Write( @buffer[0], offset, count); | |
221 | end; | |
222 | ||
223 | procedure TThriftStreamImpl.Write( const pBuf : Pointer; offset: Integer; count: Integer); | |
224 | begin | |
225 | CheckSizeAndOffset( pBuf, offset+count, offset, count); | |
226 | end; | |
227 | ||
228 | { TThriftStreamAdapterDelphi } | |
229 | ||
230 | procedure TThriftStreamAdapterDelphi.Close; | |
231 | begin | |
232 | FStream.Free; | |
233 | FStream := nil; | |
234 | FOwnsStream := False; | |
235 | end; | |
236 | ||
237 | constructor TThriftStreamAdapterDelphi.Create( const AStream: TStream; AOwnsStream: Boolean); | |
238 | begin | |
239 | inherited Create; | |
240 | FStream := AStream; | |
241 | FOwnsStream := AOwnsStream; | |
242 | end; | |
243 | ||
244 | destructor TThriftStreamAdapterDelphi.Destroy; | |
245 | begin | |
246 | if FOwnsStream | |
247 | then Close; | |
248 | ||
249 | inherited; | |
250 | end; | |
251 | ||
252 | procedure TThriftStreamAdapterDelphi.Flush; | |
253 | begin | |
254 | // nothing to do | |
255 | end; | |
256 | ||
257 | function TThriftStreamAdapterDelphi.IsOpen: Boolean; | |
258 | begin | |
259 | Result := FStream <> nil; | |
260 | end; | |
261 | ||
262 | procedure TThriftStreamAdapterDelphi.Open; | |
263 | begin | |
264 | // nothing to do | |
265 | end; | |
266 | ||
267 | function TThriftStreamAdapterDelphi.Read(const pBuf : Pointer; const buflen : Integer; offset, count: Integer): Integer; | |
268 | var pTmp : PByte; | |
269 | begin | |
270 | inherited; | |
271 | ||
272 | if count >= buflen-offset | |
273 | then count := buflen-offset; | |
274 | ||
275 | if count > 0 then begin | |
276 | pTmp := pBuf; | |
277 | Inc( pTmp, offset); | |
278 | Result := FStream.Read( pTmp^, count) | |
279 | end | |
280 | else Result := 0; | |
281 | end; | |
282 | ||
283 | function TThriftStreamAdapterDelphi.ToArray: TBytes; | |
284 | var | |
285 | OrgPos : Integer; | |
286 | len : Integer; | |
287 | begin | |
288 | len := 0; | |
289 | if FStream <> nil then | |
290 | begin | |
291 | len := FStream.Size; | |
292 | end; | |
293 | ||
294 | SetLength( Result, len ); | |
295 | ||
296 | if len > 0 then | |
297 | begin | |
298 | OrgPos := FStream.Position; | |
299 | try | |
300 | FStream.Position := 0; | |
301 | FStream.ReadBuffer( Pointer(@Result[0])^, len ); | |
302 | finally | |
303 | FStream.Position := OrgPos; | |
304 | end; | |
305 | end | |
306 | end; | |
307 | ||
308 | procedure TThriftStreamAdapterDelphi.Write(const pBuf : Pointer; offset, count: Integer); | |
309 | var pTmp : PByte; | |
310 | begin | |
311 | inherited; | |
312 | if count > 0 then begin | |
313 | pTmp := pBuf; | |
314 | Inc( pTmp, offset); | |
315 | FStream.Write( pTmp^, count) | |
316 | end; | |
317 | end; | |
318 | ||
319 | end. |