libdap Updated for version 3.20.10
libdap4 is an implementation of OPeNDAP's DAP protocol.
XDRStreamUnMarshaller.cc
1// XDRStreamUnMarshaller.cc
2
3// -*- mode: c++; c-basic-offset:4 -*-
4
5// This file is part of libdap, A C++ implementation of the OPeNDAP Data
6// Access Protocol.
7
8// Copyright (c) 2002,2003 OPeNDAP, Inc.
9// Author: Patrick West <pwest@ucar.edu>
10//
11// This library is free software; you can redistribute it and/or
12// modify it under the terms of the GNU Lesser General Public
13// License as published by the Free Software Foundation; either
14// version 2.1 of the License, or (at your option) any later version.
15//
16// This library is distributed in the hope that it will be useful,
17// but WITHOUT ANY WARRANTY; without even the implied warranty of
18// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19// Lesser General Public License for more details.
20//
21// You should have received a copy of the GNU Lesser General Public
22// License along with this library; if not, write to the Free Software
23// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24//
25// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
26
27// (c) COPYRIGHT URI/MIT 1994-1999
28// Please read the full copyright statement in the file COPYRIGHT_URI.
29//
30// Authors:
31// pwest Patrick West <pwest@ucar.edu>
32#include "config.h"
33#include "XDRStreamUnMarshaller.h"
34
35#include <cstring> // for memcpy
36#include <string>
37#include <sstream>
38
39//#define DODS_DEBUG2 1
40//#define DODS_DEBUG 1
41
42#include "Str.h"
43#include "Array.h"
44#include "util.h"
45#include "InternalErr.h"
46#include "debug.h"
47#include "DapIndent.h"
48
49namespace libdap {
50
51char *XDRStreamUnMarshaller::d_buf = 0;
52
53XDRStreamUnMarshaller::XDRStreamUnMarshaller(istream &in) : /*&d_source( 0 ),*/
54 d_in(in)
55{
56 if (!d_buf)
57 d_buf = (char *) malloc(XDR_DAP_BUFF_SIZE);
58 if (!d_buf)
59 throw Error(internal_error, "Failed to allocate memory for data serialization.");
60
61 //&d_source = new XDR;
62 xdrmem_create(&d_source, d_buf, XDR_DAP_BUFF_SIZE, XDR_DECODE);
63}
64
65XDRStreamUnMarshaller::XDRStreamUnMarshaller() :
66 UnMarshaller(), /*&d_source( 0 ),*/d_in(cin)
67{
68 throw InternalErr(__FILE__, __LINE__, "Default constructor not implemented.");
69}
70
71XDRStreamUnMarshaller::XDRStreamUnMarshaller(const XDRStreamUnMarshaller &um) :
72 UnMarshaller(um), /*&d_source( 0 ),*/d_in(cin)
73{
74 throw InternalErr(__FILE__, __LINE__, "Copy constructor not implemented.");
75}
76
77XDRStreamUnMarshaller &
78XDRStreamUnMarshaller::operator=(const XDRStreamUnMarshaller &)
79{
80 throw InternalErr(__FILE__, __LINE__, "Copy operator not implemented.");
81}
82
83XDRStreamUnMarshaller::~XDRStreamUnMarshaller()
84{
85 xdr_destroy( &d_source );
86 //&d_source = 0;
87}
88
89void XDRStreamUnMarshaller::get_byte(dods_byte &val)
90{
91 if (xdr_setpos( &d_source, 0 ) < 0)
92 throw Error("Failed to reposition input stream");
93 if (!(d_in.read(d_buf, 4))) {
94 if (d_in.eof())
95 throw Error("Premature EOF in input stream");
96 else {
97 ostringstream ss("Error reading from input stream: ");
98 ss << d_in.rdstate();
99 throw Error(ss.str());
100 }
101 }
102
103 DBG2( std::cerr << "_in.gcount(): " << d_in.gcount() << std::endl );
104 DBG2( std::cerr << "_in.tellg(): " << d_in.tellg() << std::endl );
105 DBG2( std::cerr << "_buf[0]: " << hex << d_buf[0] << "; _buf[1]: " << d_buf[1]
106 << "; _buf[2]: " << d_buf[2] << "; _buf[3]: " << d_buf[3]
107 << dec << std::endl );
108
109 if (!xdr_char(&d_source, (char *) &val))
110 throw Error("Network I/O Error. Could not read byte data.");
111
112 DBG2(std::cerr << "get_byte: " << val << std::endl );
113}
114
115void XDRStreamUnMarshaller::get_int16(dods_int16 &val)
116{
117 xdr_setpos( &d_source, 0);
118 d_in.read(d_buf, 4);
119
120 if (!XDR_INT16(&d_source, &val))
121 throw Error("Network I/O Error. Could not read int 16 data.");
122}
123
124void XDRStreamUnMarshaller::get_int32(dods_int32 &val)
125{
126 xdr_setpos( &d_source, 0);
127 d_in.read(d_buf, 4);
128
129 if (!XDR_INT32(&d_source, &val))
130 throw Error("Network I/O Error. Could not read int 32 data.");
131}
132
133void XDRStreamUnMarshaller::get_float32(dods_float32 &val)
134{
135 xdr_setpos( &d_source, 0);
136 d_in.read(d_buf, 4);
137
138 if (!xdr_float(&d_source, &val))
139 throw Error("Network I/O Error. Could not read float 32 data.");
140}
141
142void XDRStreamUnMarshaller::get_float64(dods_float64 &val)
143{
144 xdr_setpos( &d_source, 0);
145 d_in.read(d_buf, 8);
146
147 if (!xdr_double(&d_source, &val))
148 throw Error("Network I/O Error. Could not read float 64 data.");
149}
150
151void XDRStreamUnMarshaller::get_uint16(dods_uint16 &val)
152{
153 xdr_setpos( &d_source, 0);
154 d_in.read(d_buf, 4);
155
156 if (!XDR_UINT16(&d_source, &val))
157 throw Error("Network I/O Error. Could not read uint 16 data.");
158}
159
160void XDRStreamUnMarshaller::get_uint32(dods_uint32 &val)
161{
162 xdr_setpos( &d_source, 0);
163 d_in.read(d_buf, 4);
164
165 if (!XDR_UINT32(&d_source, &val))
166 throw Error("Network I/O Error. Could not read uint 32 data.");
167}
168
169void XDRStreamUnMarshaller::get_str(string &val)
170{
171 int i;
172 get_int(i);
173 DBG(std::cerr << "i: " << i << std::endl);
174
175 // Must round up string size to next 4
176 i = ((i + 3) / 4) * 4;
177 DBG(std::cerr << "i: " << i << std::endl);
178
179 char *in_tmp = 0;
180 //char *buf = 0;
181 //XDR *source = 0;
182 // Must address the case where the string is larger than the buffer
183 if (i + 4 > XDR_DAP_BUFF_SIZE) {
184#if 0
185 char *buf = (char *) malloc(i + 4);
186 if (!buf)
187 throw InternalErr(__FILE__, __LINE__, "Error allocating memory");
188#endif
189 vector<char> buf(i+4);
190
191 XDR source;// = new XDR;
192 xdrmem_create(&source, buf.data(), i + 4, XDR_DECODE);
193 memcpy(buf.data(), d_buf, 4);
194
195 d_in.read(buf.data() + 4, i);
196
197 xdr_setpos( &source, 0);
198 if (!xdr_string( &source, &in_tmp, max_str_len)) {
199 xdr_destroy( &source );
200 throw Error("Network I/O Error. Could not read string data.");
201 }
202
203 xdr_destroy( &source );
204 }
205 else {
206 d_in.read(d_buf + 4, i);
207
208 xdr_setpos( &d_source, 0);
209 if (!xdr_string(&d_source, &in_tmp, max_str_len))
210 throw Error("Network I/O Error. Could not read string data.");
211 }
212
213 val = in_tmp;
214
215 free(in_tmp);
216}
217
218void XDRStreamUnMarshaller::get_url(string &val)
219{
220 get_str(val);
221}
222
223void XDRStreamUnMarshaller::get_opaque(char *val, unsigned int len)
224{
225 xdr_setpos( &d_source, 0);
226
227 // Round len up to the next multiple of 4. There is also the RNDUP()
228 // macro in xdr.h, at least on OS/X.
229 len += len & 3;
230 if (static_cast<int>(len) > XDR_DAP_BUFF_SIZE)
231 throw Error("Network I/O Error. Length of opaque data larger than allowed");
232
233 d_in.read(d_buf, len);
234
235 xdr_opaque(&d_source, val, len);
236}
237
238void XDRStreamUnMarshaller::get_int(int &val)
239{
240 xdr_setpos( &d_source, 0);
241 d_in.read(d_buf, 4);
242
243 if (!xdr_int(&d_source, &val))
244 throw Error("Network I/O Error(1).");
245
246 DBG(std::cerr << "get_int: " << val << std::endl);
247}
248
249void XDRStreamUnMarshaller::get_vector(char **val, unsigned int &num, Vector &)
250{
251 int i;
252 get_int(i); // This leaves the XDR encoded value in d_buf; used later
253 DBG(std::cerr << "i: " << i << std::endl);
254
255 // Must round up string size to next 4
256 i += i & 3;
257 DBG(std::cerr << "i: " << i << std::endl);
258
259 //char *buf = 0;
260 //XDR *source = 0;
261 // Must address the case where the string is larger than the buffer
262 if (i + 4 > XDR_DAP_BUFF_SIZE) {
263 vector<char> buf(i+4);
264 XDR source;
265 xdrmem_create(&source, buf.data(), i + 4, XDR_DECODE);
266 memcpy(buf.data(), d_buf, 4);
267
268 d_in.read(buf.data() + 4, i);
269 DBG2(cerr << "bytes read: " << d_in.gcount() << endl);
270
271 xdr_setpos(&source, 0);
272 if (!xdr_bytes(&d_source, val, &num, DODS_MAX_ARRAY)) {
273 xdr_destroy(&source);
274 throw Error("Network I/O Error. Could not read byte array data.");
275 }
276
277 xdr_destroy( &source );
278 }
279 else {
280 d_in.read(d_buf + 4, i);
281 DBG2(cerr << "bytes read: " << d_in.gcount() << endl);
282
283 xdr_setpos(&d_source, 0);
284 if (!xdr_bytes(&d_source, val, &num, DODS_MAX_ARRAY))
285 throw Error("Network I/O Error. Could not read byte array data.");
286 }
287}
288
289void XDRStreamUnMarshaller::get_vector(char **val, unsigned int &num, int width, Vector &vec)
290{
291 get_vector(val, num, width, vec.var()->type());
292}
293
294void XDRStreamUnMarshaller::get_vector(char **val, unsigned int &num, int width, Type type)
295{
296 int i;
297 get_int(i); // This leaves the XDR encoded value in d_buf; used later
298 DBG(std::cerr << "i: " << i << std::endl);
299
300 width += width & 3;
301 DBG(std::cerr << "width: " << width << std::endl);
302
303 int size = i * width; // + 4; // '+ 4' to hold the int already read
304
305 // Must address the case where the string is larger than the buffer
306 if (size > XDR_DAP_BUFF_SIZE) {
307 vector<char> buf(size+4);
308 XDR source;
309 xdrmem_create(&source, buf.data(), size + 4, XDR_DECODE);
310 DBG(cerr << "size: " << size << endl);
311 memcpy(buf.data(), d_buf, 4);
312
313 d_in.read(buf.data() + 4, size); // +4 for the int already read
314 DBG(cerr << "bytes read: " << d_in.gcount() << endl);
315
316 xdr_setpos(&source, 0);
317 if (!xdr_array(&source, val, &num, DODS_MAX_ARRAY, width, XDRUtils::xdr_coder(type))) {
318 xdr_destroy( &source );
319 throw Error("Network I/O Error. Could not read array data.");
320 }
321
322 xdr_destroy( &source );
323 }
324 else {
325 d_in.read(d_buf + 4, size);
326 DBG(cerr << "bytes read (2): " << d_in.gcount() << endl);
327
328 xdr_setpos( &d_source, 0);
329 if (!xdr_array(&d_source, val, &num, DODS_MAX_ARRAY, width, XDRUtils::xdr_coder(type)))
330 throw Error("Network I/O Error. Could not read array data.");
331 }
332}
333
334void XDRStreamUnMarshaller::dump(ostream &strm) const
335{
336 strm << DapIndent::LMarg << "XDRStreamUnMarshaller::dump - (" << (void *) this << ")" << endl;
337}
338
339} // namespace libdap
340
top level DAP object to house generic methods