23969876719

Committed 04 Apr 2026 02:57AM UTC coverage: 89.456% (-0.04%) from 89.494%

Build # 23969876719

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github

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Commit Message

Merge pull request #5514 from randombit/jack/ber-decoder-limits

Add BER_Decoder::Limits

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85.54

/src/lib/utils/data_src.cpp

/*
* DataSource
* (C) 1999-2007 Jack Lloyd
*     2005 Matthew Gregan
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/data_src.h>

#include <botan/exceptn.h>
#include <botan/mem_ops.h>
#include <botan/internal/fmt.h>
#include <botan/internal/mem_utils.h>
#include <algorithm>
#include <istream>

#if defined(BOTAN_TARGET_OS_HAS_FILESYSTEM)
   #include <fstream>
#endif

namespace Botan {

/*
* Read a single byte from the DataSource
*/
size_t DataSource::read_byte(uint8_t& out) {
   return read(&out, 1);
}

/*
* Read a single byte from the DataSource
*/
std::optional<uint8_t> DataSource::read_byte() {
   uint8_t b = 0;
   if(this->read(&b, 1) == 1) {
      return b;
   } else {
      return {};
   }
}

/*
* Peek a single byte from the DataSource
*/
size_t DataSource::peek_byte(uint8_t& out) const {
   return peek(&out, 1, 0);
}

/*
* Discard the next N bytes of the data
*/
size_t DataSource::discard_next(size_t n) {
   uint8_t buf[64] = {0};
   size_t discarded = 0;

   while(n > 0) {
      const size_t got = this->read(buf, std::min(n, sizeof(buf)));
      discarded += got;
      n -= got;

      if(got == 0) {
         break;
      }
   }

   return discarded;
}

/*
* Read from a memory buffer
*/
size_t DataSource_Memory::read(uint8_t out[], size_t length) {
   const size_t got = std::min<size_t>(m_source.size() - m_offset, length);
   copy_mem(out, m_source.data() + m_offset, got);
   m_offset += got;
   return got;
}

bool DataSource_Memory::check_available(size_t n) {
   return (n <= (m_source.size() - m_offset));
}

/*
* Peek into a memory buffer
*/
size_t DataSource_Memory::peek(uint8_t out[], size_t length, size_t peek_offset) const {
   const size_t bytes_left = m_source.size() - m_offset;
   if(peek_offset >= bytes_left) {
      return 0;
   }

   const size_t got = std::min(bytes_left - peek_offset, length);
   copy_mem(out, &m_source[m_offset + peek_offset], got);
   return got;
}

/*
* Check if the memory buffer is empty
*/
bool DataSource_Memory::end_of_data() const {
   return (m_offset == m_source.size());
}

/*
* DataSource_Memory Constructor
*/
DataSource_Memory::DataSource_Memory(std::string_view in) : DataSource_Memory(as_span_of_bytes(in)) {}

/*
* Read from a stream
*/
size_t DataSource_Stream::read(uint8_t out[], size_t length) {
   m_source.read(cast_uint8_ptr_to_char(out), length);
   if(m_source.bad()) {
      throw Stream_IO_Error("DataSource_Stream::read: Source failure");
   }

   const size_t got = static_cast<size_t>(m_source.gcount());
   m_total_read += got;
   return got;
}

bool DataSource_Stream::check_available(size_t n) {
   const std::streampos orig_pos = m_source.tellg();
   m_source.seekg(0, std::ios::end);
   const size_t avail = static_cast<size_t>(m_source.tellg() - orig_pos);
   m_source.seekg(orig_pos);
   return (avail >= n);
}

/*
* Peek into a stream
*/
size_t DataSource_Stream::peek(uint8_t out[], size_t length, size_t offset) const {
   if(end_of_data()) {
      throw Invalid_State("DataSource_Stream: Cannot peek when out of data");
   }

   size_t got = 0;

   if(offset > 0) {
      secure_vector<uint8_t> buf(offset);
      m_source.read(cast_uint8_ptr_to_char(buf.data()), buf.size());
      if(m_source.bad()) {
         throw Stream_IO_Error("DataSource_Stream::peek: Source failure");
      }
      got = static_cast<size_t>(m_source.gcount());
   }

   if(got == offset) {
      m_source.read(cast_uint8_ptr_to_char(out), length);
      if(m_source.bad()) {
         throw Stream_IO_Error("DataSource_Stream::peek: Source failure");
      }
      got = static_cast<size_t>(m_source.gcount());
   }

   if(m_source.eof()) {
      m_source.clear();
   }
   m_source.seekg(m_total_read, std::ios::beg);

   return got;
}

/*
* Check if the stream is empty or in error
*/
bool DataSource_Stream::end_of_data() const {
   /*
   Peek to trigger EOF indicator if positioned at the end of the stream.
   Without this, good() returns true even when all data has been read.
   */
   m_source.peek();
   return (!m_source.good());
}

/*
* Return a human-readable ID for this stream
*/
std::string DataSource_Stream::id() const {
   return m_identifier;
}

#if defined(BOTAN_TARGET_OS_HAS_FILESYSTEM)

/*
* DataSource_Stream Constructor
*/
DataSource_Stream::DataSource_Stream(std::string_view path, bool use_binary) :
      m_identifier(path),
      m_source_memory(std::make_unique<std::ifstream>(std::string(path), use_binary ? std::ios::binary : std::ios::in)),
      m_source(*m_source_memory),
      m_total_read(0) {
   if(!m_source.good()) {
      throw Stream_IO_Error(fmt("DataSource: Failure opening file '{}'", path));
   }
}

#endif

/*
* DataSource_Stream Constructor
*/
DataSource_Stream::DataSource_Stream(std::istream& in, std::string_view name) :
      m_identifier(name), m_source(in), m_total_read(0) {}

DataSource_Stream::~DataSource_Stream() = default;

}  // namespace Botan

1	/*
2	* DataSource
3	* (C) 1999-2007 Jack Lloyd
4	* 2005 Matthew Gregan
5	*
6	* Botan is released under the Simplified BSD License (see license.txt)
7	*/
8
9	#include <botan/data_src.h>
10
11	#include <botan/exceptn.h>
12	#include <botan/mem_ops.h>
13	#include <botan/internal/fmt.h>
14	#include <botan/internal/mem_utils.h>
15	#include <algorithm>
16	#include <istream>
17
18	#if defined(BOTAN_TARGET_OS_HAS_FILESYSTEM)
19	#include <fstream>
20	#endif
21
22	namespace Botan {
23
24	/*
25	* Read a single byte from the DataSource
26	*/
27	size_t DataSource::read_byte(uint8_t& out) {	29,528,351✔
28	return read(&out, 1);	29,528,351✔
29	}
30
31	/*
32	* Read a single byte from the DataSource
33	*/
34	std::optional<uint8_t> DataSource::read_byte() {	31,749,378✔
35	uint8_t b = 0;	31,749,378✔
36	if(this->read(&b, 1) == 1) {	31,749,378✔
37	return b;	31,687,013✔
38	} else {
39	return {};	62,365✔
40	}
41	}
42
43	/*
44	* Peek a single byte from the DataSource
45	*/
46	size_t DataSource::peek_byte(uint8_t& out) const {	51,054✔
47	return peek(&out, 1, 0);	51,054✔
48	}
49
50	/*
51	* Discard the next N bytes of the data
52	*/
53	size_t DataSource::discard_next(size_t n) {	233,138✔
54	uint8_t buf[64] = {0};	233,138✔
55	size_t discarded = 0;	233,138✔
56
57	while(n > 0) {	380,567✔
58	const size_t got = this->read(buf, std::min(n, sizeof(buf)));	160,379✔
59	discarded += got;	147,615✔
60	n -= got;	147,615✔
61
62	if(got == 0) {	147,615✔
63	break;
64	}
65	}
66
67	return discarded;	233,138✔
68	}
69
70	/*
71	* Read from a memory buffer
72	*/
73	size_t DataSource_Memory::read(uint8_t out[], size_t length) {	23,621,404✔
74	const size_t got = std::min<size_t>(m_source.size() - m_offset, length);	23,621,404✔
75	copy_mem(out, m_source.data() + m_offset, got);	23,621,404✔
76	m_offset += got;	23,621,404✔
77	return got;	23,621,404✔
78	}
79
80	bool DataSource_Memory::check_available(size_t n) {	5,722,769✔
81	return (n <= (m_source.size() - m_offset));	5,722,769✔
82	}
83
84	/*
85	* Peek into a memory buffer
86	*/
87	size_t DataSource_Memory::peek(uint8_t out[], size_t length, size_t peek_offset) const {	238,049✔
88	const size_t bytes_left = m_source.size() - m_offset;	238,049✔
89	if(peek_offset >= bytes_left) {	238,049✔
90	return 0;
91	}
92
93	const size_t got = std::min(bytes_left - peek_offset, length);	162,278✔
94	copy_mem(out, &m_source[m_offset + peek_offset], got);	162,278✔
95	return got;	162,278✔
96	}
97
98	/*
99	* Check if the memory buffer is empty
100	*/
101	bool DataSource_Memory::end_of_data() const {	433,322✔
102	return (m_offset == m_source.size());	433,322✔
103	}
104
105	/*
106	* DataSource_Memory Constructor
107	*/
108	DataSource_Memory::DataSource_Memory(std::string_view in) : DataSource_Memory(as_span_of_bytes(in)) {}	2,679✔
109
110	/*
111	* Read from a stream
112	*/
113	size_t DataSource_Stream::read(uint8_t out[], size_t length) {	18,894,619✔
114	m_source.read(cast_uint8_ptr_to_char(out), length);	18,894,619✔
115	if(m_source.bad()) {	18,894,619✔
116	throw Stream_IO_Error("DataSource_Stream::read: Source failure");	×
117	}
118
119	const size_t got = static_cast<size_t>(m_source.gcount());	18,894,619✔
120	m_total_read += got;	18,894,619✔
121	return got;	18,894,619✔
122	}
123
124	bool DataSource_Stream::check_available(size_t n) {	1,168✔
125	const std::streampos orig_pos = m_source.tellg();	1,168✔
126	m_source.seekg(0, std::ios::end);	1,168✔
127	const size_t avail = static_cast<size_t>(m_source.tellg() - orig_pos);	1,168✔
128	m_source.seekg(orig_pos);	1,168✔
129	return (avail >= n);	1,168✔
130	}
131
132	/*
133	* Peek into a stream
134	*/
135	size_t DataSource_Stream::peek(uint8_t out[], size_t length, size_t offset) const {	8,272✔
136	if(end_of_data()) {	8,272✔
137	throw Invalid_State("DataSource_Stream: Cannot peek when out of data");	×
138	}
139
140	size_t got = 0;	8,272✔
141
142	if(offset > 0) {	8,272✔
143	secure_vector<uint8_t> buf(offset);	×
144	m_source.read(cast_uint8_ptr_to_char(buf.data()), buf.size());	×
145	if(m_source.bad()) {	×
146	throw Stream_IO_Error("DataSource_Stream::peek: Source failure");	×
147	}
148	got = static_cast<size_t>(m_source.gcount());	×
149	}	×
150
151	if(got == offset) {	×
152	m_source.read(cast_uint8_ptr_to_char(out), length);	8,272✔
153	if(m_source.bad()) {	8,272✔
154	throw Stream_IO_Error("DataSource_Stream::peek: Source failure");	×
155	}
156	got = static_cast<size_t>(m_source.gcount());	8,272✔
157	}
158
159	if(m_source.eof()) {	8,272✔
160	m_source.clear();	1,167✔
161	}
162	m_source.seekg(m_total_read, std::ios::beg);	8,272✔
163
164	return got;	8,272✔
165	}
166
167	/*
168	* Check if the stream is empty or in error
169	*/
170	bool DataSource_Stream::end_of_data() const {	20,926✔
171	/*
172	Peek to trigger EOF indicator if positioned at the end of the stream.
173	Without this, good() returns true even when all data has been read.
174	*/
175	m_source.peek();	20,926✔
176	return (!m_source.good());	20,926✔
177	}
178
179	/*
180	* Return a human-readable ID for this stream
181	*/
182	std::string DataSource_Stream::id() const {	×
183	return m_identifier;	×
184	}
185
186	#if defined(BOTAN_TARGET_OS_HAS_FILESYSTEM)
187
188	/*
189	* DataSource_Stream Constructor
190	*/
191	DataSource_Stream::DataSource_Stream(std::string_view path, bool use_binary) :	5,833✔
192	m_identifier(path),	5,833✔
193	m_source_memory(std::make_unique<std::ifstream>(std::string(path), use_binary ? std::ios::binary : std::ios::in)),	15,466✔
194	m_source(*m_source_memory),	5,833✔
195	m_total_read(0) {	5,833✔
196	if(!m_source.good()) {	5,833✔
197	throw Stream_IO_Error(fmt("DataSource: Failure opening file '{}'", path));	2✔
198	}
199	}	5,834✔
200
201	#endif
202
203	/*
204	* DataSource_Stream Constructor
205	*/
206	DataSource_Stream::DataSource_Stream(std::istream& in, std::string_view name) :	1✔
207	m_identifier(name), m_source(in), m_total_read(0) {}	1✔
208
209	DataSource_Stream::~DataSource_Stream() = default;	11,665✔
210
211	} // namespace Botan

randombit / botan / 23969876719

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