1 // Copyright Joyent, Inc. and other Node contributors.
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4 // copy of this software and associated documentation files (the
5 // "Software"), to deal in the Software without restriction, including
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8 // persons to whom the Software is furnished to do so, subject to the
9 // following conditions:
11 // The above copyright notice and this permission notice shall be included
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15 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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22 #ifndef SRC_NODE_CRYPTO_BIO_H_
23 #define SRC_NODE_CRYPTO_BIO_H_
25 #include "openssl/bio.h"
32 NodeBIO() : length_(0), read_head_(&head_), write_head_(&head_) {
41 // Move read head to next buffer if needed
42 void TryMoveReadHead();
44 // Allocate new buffer for write if needed
45 void TryAllocateForWrite();
47 // Read `len` bytes maximum into `out`, return actual number of read bytes
48 size_t Read(char* out, size_t size);
50 // Memory optimization:
51 // Deallocate children of write head's child if they're empty
54 // Return pointer to internal data and amount of
55 // contiguous data available to read
56 char* Peek(size_t* size);
58 // Return pointers and sizes of multiple internal data chunks available for
60 size_t PeekMultiple(char** out, size_t* size, size_t* count);
62 // Find first appearance of `delim` in buffer or `limit` if `delim`
64 size_t IndexOf(char delim, size_t limit);
66 // Discard all available data
69 // Put `len` bytes from `data` into buffer
70 void Write(const char* data, size_t size);
72 // Return pointer to internal data and amount of
73 // contiguous data available for future writes
74 char* PeekWritable(size_t* size);
76 // Commit reserved data
77 void Commit(size_t size);
79 // Return size of buffer in bytes
80 size_t inline Length() {
84 static inline NodeBIO* FromBIO(BIO* bio) {
85 assert(bio->ptr != NULL);
86 return static_cast<NodeBIO*>(bio->ptr);
90 static int New(BIO* bio);
91 static int Free(BIO* bio);
92 static int Read(BIO* bio, char* out, int len);
93 static int Write(BIO* bio, const char* data, int len);
94 static int Puts(BIO* bio, const char* str);
95 static int Gets(BIO* bio, char* out, int size);
96 static long Ctrl(BIO* bio, int cmd, long num, void* ptr);
98 // NOTE: Size is maximum TLS frame length, this is required if we want
99 // to fit whole ClientHello into one Buffer of NodeBIO.
100 static const size_t kBufferLength = 16 * 1024 + 5;
101 static const BIO_METHOD method;
105 Buffer() : read_pos_(0), write_pos_(0), next_(NULL) {
111 char data_[kBufferLength];
122 #endif // SRC_NODE_CRYPTO_BIO_H_