Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	crypto/crypto_bio.cc	Lines:	238	276	86.2 %
Date:	2022-08-29 04:21:03	Branches:	125	176	71.0 %


// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

#include "crypto/crypto_bio.h"
#include "base_object-inl.h"
#include "memory_tracker-inl.h"
#include "util-inl.h"

#include <openssl/bio.h>

#include <climits>
#include <cstring>

namespace node {
namespace crypto {

BIOPointer NodeBIO::New(Environment* env) {
  BIOPointer bio(BIO_new(GetMethod()));
  if (bio && env != nullptr)
    NodeBIO::FromBIO(bio.get())->env_ = env;
  return bio;
}


BIOPointer NodeBIO::NewFixed(const char* data, size_t len, Environment* env) {
  BIOPointer bio = New(env);

  if (!bio ||
      len > INT_MAX ||
      BIO_write(bio.get(), data, len) != static_cast<int>(len) ||
      BIO_set_mem_eof_return(bio.get(), 0) != 1) {
    return BIOPointer();
  }

  return bio;
}


int NodeBIO::New(BIO* bio) {
  BIO_set_data(bio, new NodeBIO());
  BIO_set_init(bio, 1);

  return 1;
}


int NodeBIO::Free(BIO* bio) {
  if (bio == nullptr)
    return 0;

  if (BIO_get_shutdown(bio)) {
    if (BIO_get_init(bio) && BIO_get_data(bio) != nullptr) {
      delete FromBIO(bio);
      BIO_set_data(bio, nullptr);
    }
  }

  return 1;
}


int NodeBIO::Read(BIO* bio, char* out, int len) {
  BIO_clear_retry_flags(bio);

  NodeBIO* nbio = FromBIO(bio);
  int bytes = nbio->Read(out, len);

  if (bytes == 0) {
    bytes = nbio->eof_return();
    if (bytes != 0) {
      BIO_set_retry_read(bio);
    }
  }

  return bytes;
}


char* NodeBIO::Peek(size_t* size) {
  *size = read_head_->write_pos_ - read_head_->read_pos_;
  return read_head_->data_ + read_head_->read_pos_;
}


size_t NodeBIO::PeekMultiple(char** out, size_t* size, size_t* count) {
  Buffer* pos = read_head_;
  size_t max = *count;
  size_t total = 0;

  size_t i;
  for (i = 0; i < max; i++) {
    size[i] = pos->write_pos_ - pos->read_pos_;
    total += size[i];
    out[i] = pos->data_ + pos->read_pos_;

    /* Don't get past write head */
    if (pos == write_head_)
      break;
    else
      pos = pos->next_;
  }

  if (i == max)
    *count = i;
  else
    *count = i + 1;

  return total;
}


int NodeBIO::Write(BIO* bio, const char* data, int len) {
  BIO_clear_retry_flags(bio);

  FromBIO(bio)->Write(data, len);

  return len;
}


int NodeBIO::Puts(BIO* bio, const char* str) {
  return Write(bio, str, strlen(str));
}


int NodeBIO::Gets(BIO* bio, char* out, int size) {
  NodeBIO* nbio = FromBIO(bio);

  if (nbio->Length() == 0)
    return 0;

  int i = nbio->IndexOf('\n', size);

  // Include '\n', if it's there.  If not, don't read off the end.
  if (i < size && i >= 0 && static_cast<size_t>(i) < nbio->Length())
    i++;

  // Shift `i` a bit to nullptr-terminate string later
  if (size == i)
    i--;

  // Flush read data
  nbio->Read(out, i);

  out[i] = 0;

  return i;
}


long NodeBIO::Ctrl(BIO* bio, int cmd, long num,  // NOLINT(runtime/int)
                   void* ptr) {
  NodeBIO* nbio;
  long ret;  // NOLINT(runtime/int)

  nbio = FromBIO(bio);
  ret = 1;

  switch (cmd) {
    case BIO_CTRL_RESET:
      nbio->Reset();
      break;
    case BIO_CTRL_EOF:
      ret = nbio->Length() == 0;
      break;
    case BIO_C_SET_BUF_MEM_EOF_RETURN:
      nbio->set_eof_return(num);
      break;
    case BIO_CTRL_INFO:
      ret = nbio->Length();
      if (ptr != nullptr)
        *reinterpret_cast<void**>(ptr) = nullptr;
      break;
    case BIO_C_SET_BUF_MEM:
      CHECK(0 && "Can't use SET_BUF_MEM_PTR with NodeBIO");
      break;
    case BIO_C_GET_BUF_MEM_PTR:
      CHECK(0 && "Can't use GET_BUF_MEM_PTR with NodeBIO");
      ret = 0;
      break;
    case BIO_CTRL_GET_CLOSE:
      ret = BIO_get_shutdown(bio);
      break;
    case BIO_CTRL_SET_CLOSE:
      BIO_set_shutdown(bio, num);
      break;
    case BIO_CTRL_WPENDING:
      ret = 0;
      break;
    case BIO_CTRL_PENDING:
      ret = nbio->Length();
      break;
    case BIO_CTRL_DUP:
    case BIO_CTRL_FLUSH:
      ret = 1;
      break;
    case BIO_CTRL_PUSH:
    case BIO_CTRL_POP:
    default:
      ret = 0;
      break;
  }
  return ret;
}


const BIO_METHOD* NodeBIO::GetMethod() {
  // This is called from InitCryptoOnce() to avoid race conditions during
  // initialization.
  static BIO_METHOD* method = nullptr;

  if (method == nullptr) {
    method = BIO_meth_new(BIO_TYPE_MEM, "node.js SSL buffer");
    BIO_meth_set_write(method, Write);
    BIO_meth_set_read(method, Read);
    BIO_meth_set_puts(method, Puts);
    BIO_meth_set_gets(method, Gets);
    BIO_meth_set_ctrl(method, Ctrl);
    BIO_meth_set_create(method, New);
    BIO_meth_set_destroy(method, Free);
  }

  return method;
}


void NodeBIO::TryMoveReadHead() {
  // `read_pos_` and `write_pos_` means the position of the reader and writer
  // inside the buffer, respectively. When they're equal - its safe to reset
  // them, because both reader and writer will continue doing their stuff
  // from new (zero) positions.
  while (read_head_->read_pos_ != 0 &&
         read_head_->read_pos_ == read_head_->write_pos_) {
    // Reset positions
    read_head_->read_pos_ = 0;
    read_head_->write_pos_ = 0;

    // Move read_head_ forward, just in case if there're still some data to
    // read in the next buffer.
    if (read_head_ != write_head_)
      read_head_ = read_head_->next_;
  }
}


size_t NodeBIO::Read(char* out, size_t size) {
  size_t bytes_read = 0;
  size_t expected = Length() > size ? size : Length();
  size_t offset = 0;
  size_t left = size;

  while (bytes_read < expected) {
    CHECK_LE(read_head_->read_pos_, read_head_->write_pos_);
    size_t avail = read_head_->write_pos_ - read_head_->read_pos_;
    if (avail > left)
      avail = left;

    // Copy data
    if (out != nullptr)
      memcpy(out + offset, read_head_->data_ + read_head_->read_pos_, avail);
    read_head_->read_pos_ += avail;

    // Move pointers
    bytes_read += avail;
    offset += avail;
    left -= avail;

    TryMoveReadHead();
  }
  CHECK_EQ(expected, bytes_read);
  length_ -= bytes_read;

  // Free all empty buffers, but write_head's child
  FreeEmpty();

  return bytes_read;
}


void NodeBIO::FreeEmpty() {
  if (write_head_ == nullptr)
    return;
  Buffer* child = write_head_->next_;
  if (child == write_head_ || child == read_head_)
    return;
  Buffer* cur = child->next_;
  if (cur == write_head_ || cur == read_head_)
    return;

  Buffer* prev = child;
  while (cur != read_head_) {
    CHECK_NE(cur, write_head_);
    CHECK_EQ(cur->write_pos_, cur->read_pos_);

    Buffer* next = cur->next_;
    delete cur;
    cur = next;
  }
  prev->next_ = cur;
}


size_t NodeBIO::IndexOf(char delim, size_t limit) {
  size_t bytes_read = 0;
  size_t max = Length() > limit ? limit : Length();
  size_t left = limit;
  Buffer* current = read_head_;

  while (bytes_read < max) {
    CHECK_LE(current->read_pos_, current->write_pos_);
    size_t avail = current->write_pos_ - current->read_pos_;
    if (avail > left)
      avail = left;

    // Walk through data
    char* tmp = current->data_ + current->read_pos_;
    size_t off = 0;
    while (off < avail && *tmp != delim) {
      off++;
      tmp++;
    }

    // Move pointers
    bytes_read += off;
    left -= off;

    // Found `delim`
    if (off != avail) {
      return bytes_read;
    }

    // Move to next buffer
    if (current->read_pos_ + avail == current->len_) {
      current = current->next_;
    }
  }
  CHECK_EQ(max, bytes_read);

  return max;
}


void NodeBIO::Write(const char* data, size_t size) {
  size_t offset = 0;
  size_t left = size;

  // Allocate initial buffer if the ring is empty
  TryAllocateForWrite(left);

  while (left > 0) {
    size_t to_write = left;
    CHECK_LE(write_head_->write_pos_, write_head_->len_);
    size_t avail = write_head_->len_ - write_head_->write_pos_;

    if (to_write > avail)
      to_write = avail;

    // Copy data
    memcpy(write_head_->data_ + write_head_->write_pos_,
           data + offset,
           to_write);

    // Move pointers
    left -= to_write;
    offset += to_write;
    length_ += to_write;
    write_head_->write_pos_ += to_write;
    CHECK_LE(write_head_->write_pos_, write_head_->len_);

    // Go to next buffer if there still are some bytes to write
    if (left != 0) {
      CHECK_EQ(write_head_->write_pos_, write_head_->len_);
      TryAllocateForWrite(left);
      write_head_ = write_head_->next_;

      // Additionally, since we're moved to the next buffer, read head
      // may be moved as well.
      TryMoveReadHead();
    }
  }
  CHECK_EQ(left, 0);
}


char* NodeBIO::PeekWritable(size_t* size) {
  TryAllocateForWrite(*size);

  size_t available = write_head_->len_ - write_head_->write_pos_;
  if (*size == 0 || available <= *size)
    *size = available;

  return write_head_->data_ + write_head_->write_pos_;
}


void NodeBIO::Commit(size_t size) {
  write_head_->write_pos_ += size;
  length_ += size;
  CHECK_LE(write_head_->write_pos_, write_head_->len_);

  // Allocate new buffer if write head is full,
  // and there're no other place to go
  TryAllocateForWrite(0);
  if (write_head_->write_pos_ == write_head_->len_) {
    write_head_ = write_head_->next_;

    // Additionally, since we're moved to the next buffer, read head
    // may be moved as well.
    TryMoveReadHead();
  }
}


void NodeBIO::TryAllocateForWrite(size_t hint) {
  Buffer* w = write_head_;
  Buffer* r = read_head_;
  // If write head is full, next buffer is either read head or not empty.
  if (w == nullptr ||
      (w->write_pos_ == w->len_ &&
       (w->next_ == r || w->next_->write_pos_ != 0))) {
    size_t len = w == nullptr ? initial_ :
                             kThroughputBufferLength;
    if (len < hint)
      len = hint;

    // If there is a one time allocation size hint, use it.
    if (allocate_hint_ > len) {
      len = allocate_hint_;
      allocate_hint_ = 0;
    }

    Buffer* next = new Buffer(env_, len);

    if (w == nullptr) {
      next->next_ = next;
      write_head_ = next;
      read_head_ = next;
    } else {
      next->next_ = w->next_;
      w->next_ = next;
    }
  }
}


void NodeBIO::Reset() {
  if (read_head_ == nullptr)
    return;

  while (read_head_->read_pos_ != read_head_->write_pos_) {
    CHECK(read_head_->write_pos_ > read_head_->read_pos_);

    length_ -= read_head_->write_pos_ - read_head_->read_pos_;
    read_head_->write_pos_ = 0;
    read_head_->read_pos_ = 0;

    read_head_ = read_head_->next_;
  }
  write_head_ = read_head_;
  CHECK_EQ(length_, 0);
}


NodeBIO::~NodeBIO() {
  if (read_head_ == nullptr)
    return;

  Buffer* current = read_head_;
  do {
    Buffer* next = current->next_;
    delete current;
    current = next;
  } while (current != read_head_);

  read_head_ = nullptr;
  write_head_ = nullptr;
}


NodeBIO* NodeBIO::FromBIO(BIO* bio) {
  CHECK_NOT_NULL(BIO_get_data(bio));
  return static_cast<NodeBIO*>(BIO_get_data(bio));
}


}  // namespace crypto
}  // namespace node


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			// Copyright Joyent, Inc. and other Node contributors.
2			//
3			// Permission is hereby granted, free of charge, to any person obtaining a
4			// copy of this software and associated documentation files (the
5			// "Software"), to deal in the Software without restriction, including
6			// without limitation the rights to use, copy, modify, merge, publish,
7			// distribute, sublicense, and/or sell copies of the Software, and to permit
8			// persons to whom the Software is furnished to do so, subject to the
9			// following conditions:
10			//
11			// The above copyright notice and this permission notice shall be included
12			// in all copies or substantial portions of the Software.
13			//
14			// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15			// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16			// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
17			// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
18			// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
19			// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
20			// USE OR OTHER DEALINGS IN THE SOFTWARE.
21
22			#include "crypto/crypto_bio.h"
23			#include "base_object-inl.h"
24			#include "memory_tracker-inl.h"
25			#include "util-inl.h"
26
27			#include <openssl/bio.h>
28
29			#include <climits>
30			#include <cstring>
31
32			namespace node {
33			namespace crypto {
34
35		63001	BIOPointer NodeBIO::New(Environment* env) {
36		63001	BIOPointer bio(BIO_new(GetMethod()));
37	✓✗✓✓ ✓✓	63001	if (bio && env != nullptr)
38		24804	NodeBIO::FromBIO(bio.get())->env_ = env;
39		63001	return bio;
40			}
41
42
43		38197	BIOPointer NodeBIO::NewFixed(const char* data, size_t len, Environment* env) {
44		76394	BIOPointer bio = New(env);
45
46	✓✗	76394	if (!bio \|\|
47		38197	len > INT_MAX \|\|
48	✓✗✓✗ ✗✓✗✓	114591	BIO_write(bio.get(), data, len) != static_cast<int>(len) \|\|
49		38197	BIO_set_mem_eof_return(bio.get(), 0) != 1) {
50			return BIOPointer();
51			}
52
53		38197	return bio;
54			}
55
56
57		63001	int NodeBIO::New(BIO* bio) {
58		63001	BIO_set_data(bio, new NodeBIO());
59		63001	BIO_set_init(bio, 1);
60
61		63001	return 1;
62			}
63
64
65		62985	int NodeBIO::Free(BIO* bio) {
66	✗✓	62985	if (bio == nullptr)
67			return 0;
68
69	✓✗	62985	if (BIO_get_shutdown(bio)) {
70	✓✗✓✗ ✓✗	62985	if (BIO_get_init(bio) && BIO_get_data(bio) != nullptr) {
71	✓✗	62985	delete FromBIO(bio);
72		62985	BIO_set_data(bio, nullptr);
73			}
74			}
75
76		62985	return 1;
77			}
78
79
80		36953	int NodeBIO::Read(BIO* bio, char* out, int len) {
81		36953	BIO_clear_retry_flags(bio);
82
83		36953	NodeBIO* nbio = FromBIO(bio);
84		36953	int bytes = nbio->Read(out, len);
85
86	✓✓	36953	if (bytes == 0) {
87		7797	bytes = nbio->eof_return();
88	✓✓	7797	if (bytes != 0) {
89		7795	BIO_set_retry_read(bio);
90			}
91			}
92
93		36953	return bytes;
94			}
95
96
97		20	char* NodeBIO::Peek(size_t* size) {
98		20	*size = read_head_->write_pos_ - read_head_->read_pos_;
99		20	return read_head_->data_ + read_head_->read_pos_;
100			}
101
102
103		7572	size_t NodeBIO::PeekMultiple(char** out, size_t* size, size_t* count) {
104		7572	Buffer* pos = read_head_;
105		7572	size_t max = *count;
106		7572	size_t total = 0;
107
108			size_t i;
109	✓✗	7708	for (i = 0; i < max; i++) {
110		7708	size[i] = pos->write_pos_ - pos->read_pos_;
111		7708	total += size[i];
112		7708	out[i] = pos->data_ + pos->read_pos_;
113
114			/* Don't get past write head */
115	✓✓	7708	if (pos == write_head_)
116		7572	break;
117			else
118		136	pos = pos->next_;
119			}
120
121	✗✓	7572	if (i == max)
122			*count = i;
123			else
124		7572	*count = i + 1;
125
126		7572	return total;
127			}
128
129
130		48530	int NodeBIO::Write(BIO* bio, const char* data, int len) {
131		48530	BIO_clear_retry_flags(bio);
132
133		48530	FromBIO(bio)->Write(data, len);
134
135		48530	return len;
136			}
137
138
139			int NodeBIO::Puts(BIO* bio, const char* str) {
140			return Write(bio, str, strlen(str));
141			}
142
143
144		870850	int NodeBIO::Gets(BIO* bio, char* out, int size) {
145		870850	NodeBIO* nbio = FromBIO(bio);
146
147	✓✓	870850	if (nbio->Length() == 0)
148		1572	return 0;
149
150		869278	int i = nbio->IndexOf('\n', size);
151
152			// Include '\n', if it's there. If not, don't read off the end.
153	✓✗✓✗ ✓✓✓✓	869278	if (i < size && i >= 0 && static_cast<size_t>(i) < nbio->Length())
154		833639	i++;
155
156			// Shift `i` a bit to nullptr-terminate string later
157	✗✓	869278	if (size == i)
158			i--;
159
160			// Flush read data
161		869278	nbio->Read(out, i);
162
163		869278	out[i] = 0;
164
165		869278	return i;
166			}
167
168
169		73427	long NodeBIO::Ctrl(BIO* bio, int cmd, long num, // NOLINT(runtime/int)
170			void* ptr) {
171			NodeBIO* nbio;
172			long ret; // NOLINT(runtime/int)
173
174		73427	nbio = FromBIO(bio);
175		73427	ret = 1;
176
177	✗✓✓✗ ✗✗✗✗ ✗✓✓✓	73427	switch (cmd) {
178			case BIO_CTRL_RESET:
179			nbio->Reset();
180			break;
181		32	case BIO_CTRL_EOF:
182		32	ret = nbio->Length() == 0;
183		32	break;
184		38197	case BIO_C_SET_BUF_MEM_EOF_RETURN:
185		38197	nbio->set_eof_return(num);
186		38197	break;
187			case BIO_CTRL_INFO:
188			ret = nbio->Length();
189			if (ptr != nullptr)
190			reinterpret_cast<void*>(ptr) = nullptr;
191			break;
192			case BIO_C_SET_BUF_MEM:
193			CHECK(0 && "Can't use SET_BUF_MEM_PTR with NodeBIO");
194			break;
195			case BIO_C_GET_BUF_MEM_PTR:
196			CHECK(0 && "Can't use GET_BUF_MEM_PTR with NodeBIO");
197			ret = 0;
198			break;
199			case BIO_CTRL_GET_CLOSE:
200			ret = BIO_get_shutdown(bio);
201			break;
202			case BIO_CTRL_SET_CLOSE:
203			BIO_set_shutdown(bio, num);
204			break;
205			case BIO_CTRL_WPENDING:
206			ret = 0;
207			break;
208		17074	case BIO_CTRL_PENDING:
209		17074	ret = nbio->Length();
210		17074	break;
211		6109	case BIO_CTRL_DUP:
212			case BIO_CTRL_FLUSH:
213		6109	ret = 1;
214		6109	break;
215		12015	case BIO_CTRL_PUSH:
216			case BIO_CTRL_POP:
217			default:
218		12015	ret = 0;
219		12015	break;
220			}
221		73427	return ret;
222			}
223
224
225		68426	const BIO_METHOD* NodeBIO::GetMethod() {
226			// This is called from InitCryptoOnce() to avoid race conditions during
227			// initialization.
228			static BIO_METHOD* method = nullptr;
229
230	✓✓	68426	if (method == nullptr) {
231		5425	method = BIO_meth_new(BIO_TYPE_MEM, "node.js SSL buffer");
232		5425	BIO_meth_set_write(method, Write);
233		5425	BIO_meth_set_read(method, Read);
234		5425	BIO_meth_set_puts(method, Puts);
235		5425	BIO_meth_set_gets(method, Gets);
236		5425	BIO_meth_set_ctrl(method, Ctrl);
237		5425	BIO_meth_set_create(method, New);
238		5425	BIO_meth_set_destroy(method, Free);
239			}
240
241		68426	return method;
242			}
243
244
245		958255	void NodeBIO::TryMoveReadHead() {
246			// `read_pos_` and `write_pos_` means the position of the reader and writer
247			// inside the buffer, respectively. When they're equal - its safe to reset
248			// them, because both reader and writer will continue doing their stuff
249			// from new (zero) positions.
250	✓✓	958255	while (read_head_->read_pos_ != 0 &&
251	✓✓	905949	read_head_->read_pos_ == read_head_->write_pos_) {
252			// Reset positions
253		51448	read_head_->read_pos_ = 0;
254		51448	read_head_->write_pos_ = 0;
255
256			// Move read_head_ forward, just in case if there're still some data to
257			// read in the next buffer.
258	✓✓	51448	if (read_head_ != write_head_)
259		332	read_head_ = read_head_->next_;
260			}
261		906807	}
262
263
264		913619	size_t NodeBIO::Read(char* out, size_t size) {
265		913619	size_t bytes_read = 0;
266	✓✓	913619	size_t expected = Length() > size ? size : Length();
267		913619	size_t offset = 0;
268		913619	size_t left = size;
269
270	✓✓	1819568	while (bytes_read < expected) {
271	✗✓	905949	CHECK_LE(read_head_->read_pos_, read_head_->write_pos_);
272		905949	size_t avail = read_head_->write_pos_ - read_head_->read_pos_;
273	✓✓	905949	if (avail > left)
274		854501	avail = left;
275
276			// Copy data
277	✓✓	905949	if (out != nullptr)
278		898434	memcpy(out + offset, read_head_->data_ + read_head_->read_pos_, avail);
279		905949	read_head_->read_pos_ += avail;
280
281			// Move pointers
282		905949	bytes_read += avail;
283		905949	offset += avail;
284		905949	left -= avail;
285
286		905949	TryMoveReadHead();
287			}
288	✗✓	913619	CHECK_EQ(expected, bytes_read);
289		913619	length_ -= bytes_read;
290
291			// Free all empty buffers, but write_head's child
292		913619	FreeEmpty();
293
294		913619	return bytes_read;
295			}
296
297
298		913619	void NodeBIO::FreeEmpty() {
299	✓✓	913619	if (write_head_ == nullptr)
300		913618	return;
301		911849	Buffer* child = write_head_->next_;
302	✓✓✓✓	911849	if (child == write_head_ \|\| child == read_head_)
303		906667	return;
304		5182	Buffer* cur = child->next_;
305	✓✓✗✓	5182	if (cur == write_head_ \|\| cur == read_head_)
306		5181	return;
307
308		1	Buffer* prev = child;
309	✓✓	2	while (cur != read_head_) {
310	✗✓	1	CHECK_NE(cur, write_head_);
311	✗✓	1	CHECK_EQ(cur->write_pos_, cur->read_pos_);
312
313		1	Buffer* next = cur->next_;
314	✓✗	1	delete cur;
315		1	cur = next;
316			}
317		1	prev->next_ = cur;
318			}
319
320
321		869278	size_t NodeBIO::IndexOf(char delim, size_t limit) {
322		869278	size_t bytes_read = 0;
323	✓✓	869278	size_t max = Length() > limit ? limit : Length();
324		869278	size_t left = limit;
325		869278	Buffer* current = read_head_;
326
327	✓✓	904917	while (bytes_read < max) {
328	✗✓	869278	CHECK_LE(current->read_pos_, current->write_pos_);
329		869278	size_t avail = current->write_pos_ - current->read_pos_;
330	✓✓	869278	if (avail > left)
331		711726	avail = left;
332
333			// Walk through data
334		869278	char* tmp = current->data_ + current->read_pos_;
335		869278	size_t off = 0;
336	✓✓✓✓	58153483	while (off < avail && *tmp != delim) {
337		57284205	off++;
338		57284205	tmp++;
339			}
340
341			// Move pointers
342		869278	bytes_read += off;
343		869278	left -= off;
344
345			// Found `delim`
346	✓✓	869278	if (off != avail) {
347		833639	return bytes_read;
348			}
349
350			// Move to next buffer
351	✓✓	35639	if (current->read_pos_ + avail == current->len_) {
352		28834	current = current->next_;
353			}
354			}
355	✗✓	35639	CHECK_EQ(max, bytes_read);
356
357		35639	return max;
358			}
359
360
361		48530	void NodeBIO::Write(const char* data, size_t size) {
362		48530	size_t offset = 0;
363		48530	size_t left = size;
364
365			// Allocate initial buffer if the ring is empty
366		48530	TryAllocateForWrite(left);
367
368	✓✓	97198	while (left > 0) {
369		48668	size_t to_write = left;
370	✗✓	48668	CHECK_LE(write_head_->write_pos_, write_head_->len_);
371		48668	size_t avail = write_head_->len_ - write_head_->write_pos_;
372
373	✓✓	48668	if (to_write > avail)
374		138	to_write = avail;
375
376			// Copy data
377		48668	memcpy(write_head_->data_ + write_head_->write_pos_,
378		48668	data + offset,
379			to_write);
380
381			// Move pointers
382		48668	left -= to_write;
383		48668	offset += to_write;
384		48668	length_ += to_write;
385		48668	write_head_->write_pos_ += to_write;
386	✗✓	48668	CHECK_LE(write_head_->write_pos_, write_head_->len_);
387
388			// Go to next buffer if there still are some bytes to write
389	✓✓	48668	if (left != 0) {
390	✗✓	138	CHECK_EQ(write_head_->write_pos_, write_head_->len_);
391		138	TryAllocateForWrite(left);
392		138	write_head_ = write_head_->next_;
393
394			// Additionally, since we're moved to the next buffer, read head
395			// may be moved as well.
396		138	TryMoveReadHead();
397			}
398			}
399	✗✓	48530	CHECK_EQ(left, 0);
400		48530	}
401
402
403		7213	char* NodeBIO::PeekWritable(size_t* size) {
404		7213	TryAllocateForWrite(*size);
405
406		7213	size_t available = write_head_->len_ - write_head_->write_pos_;
407	✓✗✓✓	7213	if (size == 0 \|\| available <= size)
408		7170	*size = available;
409
410		7213	return write_head_->data_ + write_head_->write_pos_;
411			}
412
413
414		6384	void NodeBIO::Commit(size_t size) {
415		6384	write_head_->write_pos_ += size;
416		6384	length_ += size;
417	✗✓	6384	CHECK_LE(write_head_->write_pos_, write_head_->len_);
418
419			// Allocate new buffer if write head is full,
420			// and there're no other place to go
421		6384	TryAllocateForWrite(0);
422	✓✓	6384	if (write_head_->write_pos_ == write_head_->len_) {
423		720	write_head_ = write_head_->next_;
424
425			// Additionally, since we're moved to the next buffer, read head
426			// may be moved as well.
427		720	TryMoveReadHead();
428			}
429		6384	}
430
431
432		62265	void NodeBIO::TryAllocateForWrite(size_t hint) {
433		62265	Buffer* w = write_head_;
434		62265	Buffer* r = read_head_;
435			// If write head is full, next buffer is either read head or not empty.
436	✓✓	62265	if (w == nullptr \|\|
437	✓✓	19385	(w->write_pos_ == w->len_ &&
438	✓✓✗✓	860	(w->next_ == r \|\| w->next_->write_pos_ != 0))) {
439	✓✓	43547	size_t len = w == nullptr ? initial_ :
440			kThroughputBufferLength;
441	✓✓	43547	if (len < hint)
442		33350	len = hint;
443
444			// If there is a one time allocation size hint, use it.
445	✓✓	43547	if (allocate_hint_ > len) {
446		23	len = allocate_hint_;
447		23	allocate_hint_ = 0;
448			}
449
450		43547	Buffer* next = new Buffer(env_, len);
451
452	✓✓	43547	if (w == nullptr) {
453		42880	next->next_ = next;
454		42880	write_head_ = next;
455		42880	read_head_ = next;
456			} else {
457		667	next->next_ = w->next_;
458		667	w->next_ = next;
459			}
460			}
461		62265	}
462
463
464			void NodeBIO::Reset() {
465			if (read_head_ == nullptr)
466			return;
467
468			while (read_head_->read_pos_ != read_head_->write_pos_) {
469			CHECK(read_head_->write_pos_ > read_head_->read_pos_);
470
471			length_ -= read_head_->write_pos_ - read_head_->read_pos_;
472			read_head_->write_pos_ = 0;
473			read_head_->read_pos_ = 0;
474
475			read_head_ = read_head_->next_;
476			}
477			write_head_ = read_head_;
478			CHECK_EQ(length_, 0);
479			}
480
481
482	✓✓	251940	NodeBIO::~NodeBIO() {
483	✓✓	125970	if (read_head_ == nullptr)
484		40242	return;
485
486		85728	Buffer* current = read_head_;
487		1326	do {
488		87054	Buffer* next = current->next_;
489	✓✗	87054	delete current;
490		87054	current = next;
491	✓✓	87054	} while (current != read_head_);
492
493		85728	read_head_ = nullptr;
494		85728	write_head_ = nullptr;
495		251940	}
496
497
498		1160512	NodeBIO* NodeBIO::FromBIO(BIO* bio) {
499	✗✓	1160512	CHECK_NOT_NULL(BIO_get_data(bio));
500		1160512	return static_cast<NodeBIO*>(BIO_get_data(bio));
501			}
502
503
504			} // namespace crypto
505			} // namespace node