path: root/doc/man3/BIO_s_mem.pod
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authorJung-uk Kim <jkim@FreeBSD.org>2018-09-13 19:18:07 +0000
committerJung-uk Kim <jkim@FreeBSD.org>2018-09-13 19:18:07 +0000
commita43ce912fc025d11e1395506111f75fc194d7ba5 (patch)
tree9794cf7720d75938ed0ea4f499c0dcd4b6eacdda /doc/man3/BIO_s_mem.pod
parent02be298e504b8554caca6dc85af450e1ea44d19d (diff)
Import OpenSSL 1.1.1.vendor/openssl/1.1.1
Notes: svn path=/vendor-crypto/openssl/dist/; revision=338658 svn path=/vendor-crypto/openssl/1.1.1/; revision=338659; tag=vendor/openssl/1.1.1
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+=head1 NAME
+BIO_s_mem, BIO_set_mem_eof_return, BIO_get_mem_data, BIO_set_mem_buf,
+BIO_get_mem_ptr, BIO_new_mem_buf - memory BIO
+=head1 SYNOPSIS
+ #include <openssl/bio.h>
+ const BIO_METHOD *BIO_s_mem(void);
+ const BIO_METHOD *BIO_s_secmem(void);
+ BIO_set_mem_eof_return(BIO *b, int v)
+ long BIO_get_mem_data(BIO *b, char **pp)
+ BIO_set_mem_buf(BIO *b, BUF_MEM *bm, int c)
+ BIO_get_mem_ptr(BIO *b, BUF_MEM **pp)
+ BIO *BIO_new_mem_buf(const void *buf, int len);
+BIO_s_mem() returns the memory BIO method function.
+A memory BIO is a source/sink BIO which uses memory for its I/O. Data
+written to a memory BIO is stored in a BUF_MEM structure which is extended
+as appropriate to accommodate the stored data.
+BIO_s_secmem() is like BIO_s_mem() except that the secure heap is used
+for buffer storage.
+Any data written to a memory BIO can be recalled by reading from it.
+Unless the memory BIO is read only any data read from it is deleted from
+the BIO.
+Memory BIOs support BIO_gets() and BIO_puts().
+If the BIO_CLOSE flag is set when a memory BIO is freed then the underlying
+BUF_MEM structure is also freed.
+Calling BIO_reset() on a read write memory BIO clears any data in it if the
+flag BIO_FLAGS_NONCLEAR_RST is not set. On a read only BIO or if the flag
+BIO_FLAGS_NONCLEAR_RST is set it restores the BIO to its original state and
+the data can be read again.
+BIO_eof() is true if no data is in the BIO.
+BIO_ctrl_pending() returns the number of bytes currently stored.
+BIO_set_mem_eof_return() sets the behaviour of memory BIO B<b> when it is
+empty. If the B<v> is zero then an empty memory BIO will return EOF (that is
+it will return zero and BIO_should_retry(b) will be false. If B<v> is non
+zero then it will return B<v> when it is empty and it will set the read retry
+flag (that is BIO_read_retry(b) is true). To avoid ambiguity with a normal
+positive return value B<v> should be set to a negative value, typically -1.
+BIO_get_mem_data() sets *B<pp> to a pointer to the start of the memory BIOs data
+and returns the total amount of data available. It is implemented as a macro.
+BIO_set_mem_buf() sets the internal BUF_MEM structure to B<bm> and sets the
+close flag to B<c>, that is B<c> should be either BIO_CLOSE or BIO_NOCLOSE.
+It is a macro.
+BIO_get_mem_ptr() places the underlying BUF_MEM structure in *B<pp>. It is
+a macro.
+BIO_new_mem_buf() creates a memory BIO using B<len> bytes of data at B<buf>,
+if B<len> is -1 then the B<buf> is assumed to be nul terminated and its
+length is determined by B<strlen>. The BIO is set to a read only state and
+as a result cannot be written to. This is useful when some data needs to be
+made available from a static area of memory in the form of a BIO. The
+supplied data is read directly from the supplied buffer: it is B<not> copied
+first, so the supplied area of memory must be unchanged until the BIO is freed.
+=head1 NOTES
+Writes to memory BIOs will always succeed if memory is available: that is
+their size can grow indefinitely.
+Every read from a read write memory BIO will remove the data just read with
+an internal copy operation, if a BIO contains a lot of data and it is
+read in small chunks the operation can be very slow. The use of a read only
+memory BIO avoids this problem. If the BIO must be read write then adding
+a buffering BIO to the chain will speed up the process.
+Calling BIO_set_mem_buf() on a BIO created with BIO_new_secmem() will
+give undefined results, including perhaps a program crash.
+=head1 BUGS
+There should be an option to set the maximum size of a memory BIO.
+=head1 EXAMPLE
+Create a memory BIO and write some data to it:
+ BIO *mem = BIO_new(BIO_s_mem());
+ BIO_puts(mem, "Hello World\n");
+Create a read only memory BIO:
+ char data[] = "Hello World";
+ BIO *mem = BIO_new_mem_buf(data, -1);
+Extract the BUF_MEM structure from a memory BIO and then free up the BIO:
+ BUF_MEM *bptr;
+ BIO_get_mem_ptr(mem, &bptr);
+ BIO_set_close(mem, BIO_NOCLOSE); /* So BIO_free() leaves BUF_MEM alone */
+ BIO_free(mem);
+BIO_s_mem() and BIO_s_secmem() return a valid memory B<BIO_METHOD> structure.
+BIO_set_mem_eof_return(), BIO_get_mem_data(), BIO_set_mem_buf() and BIO_get_mem_ptr()
+return 1 on success or a value which is less than or equal to 0 if an error occurred.
+BIO_new_mem_buf() returns a valid B<BIO> structure on success or NULL on error.
+Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
+Licensed under the OpenSSL license (the "License"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file LICENSE in the source distribution or at