Qore Programming Language  0.9.16
StringInputStream.h
1 /* -*- mode: c++; indent-tabs-mode: nil -*- */
2 /*
3  StringInputStream.h
4 
5  Qore Programming Language
6 
7  Copyright (C) 2016 - 2019 Qore Technologies, s.r.o.
8 
9  Permission is hereby granted, free of charge, to any person obtaining a
10  copy of this software and associated documentation files (the "Software"),
11  to deal in the Software without restriction, including without limitation
12  the rights to use, copy, modify, merge, publish, distribute, sublicense,
13  and/or sell copies of the Software, and to permit persons to whom the
14  Software is furnished to do so, subject to the following conditions:
15 
16  The above copyright notice and this permission notice shall be included in
17  all copies or substantial portions of the Software.
18 
19  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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24  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25  DEALINGS IN THE SOFTWARE.
26 
27  Note that the Qore library is released under a choice of three open-source
28  licenses: MIT (as above), LGPL 2+, or GPL 2+; see README-LICENSE for more
29  information.
30 */
31 
32 #ifndef _QORE_STRINGINPUTSTREAM_H
33 #define _QORE_STRINGINPUTSTREAM_H
34 
35 #include <stdint.h>
36 #include "qore/InputStream.h"
37 
42 public:
43  DLLLOCAL StringInputStream(const QoreStringNode *str) : src(str->stringRefSelf()) {
44  }
45 
46  DLLLOCAL const char *getName() override {
47  return "StringInputStream";
48  }
49 
50  DLLLOCAL int64 read(void *ptr, int64 limit, ExceptionSink *xsink) override {
51  assert(limit > 0);
52  qore_size_t count = src->size() - offset;
53  if (count == 0) {
54  return 0;
55  }
56  if (count > static_cast<qore_size_t>(limit)) {
57  count = limit;
58  }
59  memcpy(ptr, src->getBuffer() + offset, count);
60  offset += count;
61  return count;
62  }
63 
64  DLLLOCAL int64 peek(ExceptionSink* xsink) override {
65  if ((src->size() - offset) == 0) // No more data.
66  return -1;
67  return src->getBuffer()[offset];
68  }
69 
70  DLLLOCAL const QoreEncoding* getEncoding() const {
71  return src->getEncoding();
72  }
73 
74 private:
76  qore_size_t offset = 0;
77 };
78 
79 #endif // _QORE_STRINGINPUTSTREAM_H
SimpleRefHolder< QoreStringNode >
StringInputStream::peek
DLLLOCAL int64 peek(ExceptionSink *xsink) override
Peeks the next byte from the input stream.
Definition: StringInputStream.h:64
QoreString::size
DLLEXPORT qore_size_t size() const
returns number of bytes in the string (not including the null pointer)
QoreStringNode::stringRefSelf
DLLEXPORT QoreStringNode * stringRefSelf() const
references the object and returns a non-const pointer to "this"
QoreString::getEncoding
const DLLEXPORT QoreEncoding * getEncoding() const
returns the encoding for the string
qore_size_t
size_t qore_size_t
used for sizes (same range as a pointer)
Definition: common.h:73
int64
long long int64
64bit integer type, cannot use int64_t here since it breaks the API on some 64-bit systems due to equ...
Definition: common.h:260
StringInputStream::read
DLLLOCAL int64 read(void *ptr, int64 limit, ExceptionSink *xsink) override
Reads up to `limit` bytes from the input stream.
Definition: StringInputStream.h:50
StringInputStream
Private data for the Qore::StringInputStream class.
Definition: StringInputStream.h:41
QoreString::getBuffer
const DLLEXPORT char * getBuffer() const
returns the string's buffer; this data should not be changed
InputStream
Interface for private data of input streams.
Definition: InputStream.h:44
ExceptionSink
container for holding Qore-language exception information and also for registering a "thread_exit" ca...
Definition: ExceptionSink.h:48
StringInputStream::getName
const DLLLOCAL char * getName() override
Returns the name of the class.
Definition: StringInputStream.h:46
QoreEncoding
defines string encoding functions in Qore
Definition: QoreEncoding.h:83
QoreStringNode
Qore's string value type, reference counted, dynamically-allocated only.
Definition: QoreStringNode.h:50