detail/stream.hpp

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stream.hpp

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1		//
2		// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
3		//
4		// Distributed under the Boost Software License, Version 1.0. (See accompanying
5		// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6		//
7		// Official repository: https://github.com/boostorg/json
8		//
9
10		#ifndef BOOST_JSON_DETAIL_STREAM_HPP
11		#define BOOST_JSON_DETAIL_STREAM_HPP
12
13		namespace boost {
14		namespace json {
15		namespace detail {
16
17		class const_stream
18		{
19		friend class local_const_stream;
20
21		char const* p_;
22		char const* end_;
23
24		public:
25		const_stream() = default;
26
27	35771x	const_stream(
28		char const* data,
29		std::size_t size) noexcept
30	35771x	: p_(data)
31	35771x	, end_(data + size)
32		{
33	35771x	}
34
35		size_t
36		used(char const* begin) const noexcept
37		{
38		return static_cast<
39		size_t>(p_ - begin);
40		}
41
42		size_t
43	65198x	remain() const noexcept
44		{
45	65198x	return end_ - p_;
46		}
47
48		char const*
49	62410x	data() const noexcept
50		{
51	62410x	return p_;
52		}
53
54	31451934x	operator bool() const noexcept
55		{
56	31451934x	return p_ < end_;
57		}
58
59		// unchecked
60		char
61	31417505x	operator*() const noexcept
62		{
63	31417505x	BOOST_ASSERT(p_ < end_);
64	31417505x	return *p_;
65		}
66
67		// unchecked
68		const_stream&
69	31417505x	operator++() noexcept
70		{
71	31417505x	BOOST_ASSERT(p_ < end_);
72	31417505x	++p_;
73	31417505x	return *this;
74		}
75
76		void
77	26673x	skip(std::size_t n) noexcept
78		{
79	26673x	BOOST_ASSERT(n <= remain());
80	26673x	p_ += n;
81	26673x	}
82
83		void
84		skip_to(const char* p) noexcept
85		{
86		BOOST_ASSERT(p <= end_ && p >= p_);
87		p_ = p;
88		}
89		};
90
91		class local_const_stream
92		: public const_stream
93		{
94		const_stream& src_;
95
96		public:
97		explicit
98	44285x	local_const_stream(
99		const_stream& src) noexcept
100	44285x	: const_stream(src)
101	44285x	, src_(src)
102		{
103	44285x	}
104
105	44285x	~local_const_stream()
106		{
107	44285x	src_.p_ = p_;
108	44285x	}
109
110		void
111		clip(std::size_t n) noexcept
112		{
113		if(static_cast<std::size_t>(
114		src_.end_ - p_) > n)
115		end_ = p_ + n;
116		else
117		end_ = src_.end_;
118		}
119		};
120
121		class const_stream_wrapper
122		{
123		const char*& p_;
124		const char* const end_;
125
126		friend class clipped_const_stream;
127		public:
128	4794114x	const_stream_wrapper(
129		const char*& p,
130		const char* end)
131	4794114x	: p_(p)
132	4794114x	, end_(end)
133		{
134	4794114x	}
135
136	63385385x	void operator++() noexcept
137		{
138	63385385x	++p_;
139	63385385x	}
140
141	2046840x	void operator+=(std::size_t n) noexcept
142		{
143	2046840x	p_ += n;
144	2046840x	}
145
146	7322893x	void operator=(const char* p) noexcept
147		{
148	7322893x	p_ = p;
149	7322893x	}
150
151	70856155x	char operator*() const noexcept
152		{
153	70856155x	return *p_;
154		}
155
156	76831965x	operator bool() const noexcept
157		{
158	76831965x	return p_ < end_;
159		}
160
161	20797881x	const char* begin() const noexcept
162		{
163	20797881x	return p_;
164		}
165
166	4865457x	const char* end() const noexcept
167		{
168	4865457x	return end_;
169		}
170
171	2135882x	std::size_t remain() const noexcept
172		{
173	2135882x	return end_ - p_;
174		}
175
176	3071x	std::size_t remain(const char* p) const noexcept
177		{
178	3071x	return end_ - p;
179		}
180
181	2314834x	std::size_t used(const char* p) const noexcept
182		{
183	2314834x	return p_ - p;
184		}
185		};
186
187		class clipped_const_stream
188		: public const_stream_wrapper
189		{
190		const char* clip_;
191
192		public:
193	13678x	clipped_const_stream(
194		const char*& p,
195		const char* end)
196	13678x	: const_stream_wrapper(p, end)
197	13678x	, clip_(end)
198		{
199	13678x	}
200
201		void operator=(const char* p)
202		{
203		p_ = p;
204		}
205
206		const char* end() const noexcept
207		{
208		return clip_;
209		}
210
211	68643x	operator bool() const noexcept
212		{
213	68643x	return p_ < clip_;
214		}
215
216	11688x	std::size_t remain() const noexcept
217		{
218	11688x	return clip_ - p_;
219		}
220
221		std::size_t remain(const char* p) const noexcept
222		{
223		return clip_ - p;
224		}
225
226		void
227	15663x	clip(std::size_t n) noexcept
228		{
229	15663x	if(static_cast<std::size_t>(
230	15663x	end_ - p_) > n)
231	37x	clip_ = p_ + n;
232		else
233	15626x	clip_ = end_;
234	15663x	}
235		};
236
237		//--------------------------------------
238
239		class stream
240		{
241		friend class local_stream;
242
243		char* p_;
244		char* end_;
245
246		public:
247	33153x	stream(
248		char* data,
249		std::size_t size) noexcept
250	33153x	: p_(data)
251	33153x	, end_(data + size)
252		{
253	33153x	}
254
255		size_t
256	33151x	used(char* begin) const noexcept
257		{
258		return static_cast<
259	33151x	size_t>(p_ - begin);
260		}
261
262		size_t
263	90947x	remain() const noexcept
264		{
265	90947x	return end_ - p_;
266		}
267
268		char*
269	2961x	data() noexcept
270		{
271	2961x	return p_;
272		}
273
274	31623970x	operator bool() const noexcept
275		{
276	31623970x	return p_ < end_;
277		}
278
279		// unchecked
280		char&
281		operator*() noexcept
282		{
283		BOOST_ASSERT(p_ < end_);
284		return *p_;
285		}
286
287		// unchecked
288		stream&
289		operator++() noexcept
290		{
291		BOOST_ASSERT(p_ < end_);
292		++p_;
293		return *this;
294		}
295
296		// unchecked
297		void
298	32902x	append(
299		char const* src,
300		std::size_t n) noexcept
301		{
302	32902x	BOOST_ASSERT(remain() >= n);
303	32902x	std::memcpy(p_, src, n);
304	32902x	p_ += n;
305	32902x	}
306
307		// unchecked
308		void
309	31554230x	append(char c) noexcept
310		{
311	31554230x	BOOST_ASSERT(p_ < end_);
312	31554230x	*p_++ = c;
313	31554230x	}
314
315		void
316	2961x	advance(std::size_t n) noexcept
317		{
318	2961x	BOOST_ASSERT(remain() >= n);
319	2961x	p_ += n;
320	2961x	}
321		};
322
323		class local_stream
324		: public stream
325		{
326		stream& src_;
327
328		public:
329		explicit
330	84757x	local_stream(
331		stream& src)
332	84757x	: stream(src)
333	84757x	, src_(src)
334		{
335	84757x	}
336
337	84757x	~local_stream()
338		{
339	84757x	src_.p_ = p_;
340	84757x	}
341		};
342
343		} // detail
344		} // namespace json
345		} // namespace boost
346
347		#endif
348