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< h1 class = "title" > Utility< / h1 >
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< tr > < th class = "docinfo-name" > Author:< / th >
< td > Arvid Norberg, < a class = "last reference external" href = "mailto:arvid@rasterbar.com" > arvid@ rasterbar.com< / a > < / td > < / tr >
< tr > < th class = "docinfo-name" > Version:< / th >
< td > 1.0.0< / td > < / tr >
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< p class = "topic-title first" > Table of contents< / p >
< ul class = "simple" >
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< li > < a class = "reference internal" href = "#bitfield" id = "id39" > bitfield< / a > < / li >
< li > < a class = "reference internal" href = "#sha1-hash" id = "id40" > sha1_hash< / a > < / li >
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< / ul >
< / div >
< a name = "bitfield" > < / a > < div class = "section" id = "bitfield" >
< h1 > bitfield< / h1 >
< p > Declared in " < a class = "reference external" href = "../include/libtorrent/bitfield.hpp" > libtorrent/bitfield.hpp< / a > " < / p >
< p > The bitfiled type stores any number of bits as a < a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a >
in a heap allocated or borrowed array.< / p >
< pre class = "literal-block" >
struct bitfield
{
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**bitfield** (int bits);
**bitfield** (bitfield const& rhs);
**bitfield** (bitfield& & rhs);
**bitfield** (int bits, bool val);
**bitfield** ();
**bitfield** (char const* b, int bits);
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void < strong > borrow_bytes< / strong > (char* b, int bits);
void < strong > assign< / strong > (char const* b, int bits);
bool < strong > get_bit< / strong > (int index) const;
bool < strong > operator[]< / strong > (int index) const;
void < strong > clear_bit< / strong > (int index);
void < strong > set_bit< / strong > (int index);
bool < strong > all_set< / strong > () const;
std::size_t < strong > size< / strong > () const;
bool < strong > empty< / strong > () const;
char const* < strong > bytes< / strong > () const;
bitfield& < strong > operator=< / strong > (bitfield const& rhs);
int < strong > count< / strong > () const;
};
< / pre >
< a name = "bitfield()" > < / a > < div class = "section" id = "id3" >
< h2 > bitfield()< / h2 >
< pre class = "literal-block" >
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**bitfield** (int bits);
**bitfield** (bitfield const& rhs);
**bitfield** (bitfield& & rhs);
**bitfield** (int bits, bool val);
**bitfield** ();
**bitfield** (char const* b, int bits);
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< / pre >
< p > constructs a new < a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a > . The default constructor creates an empty
< a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a > . < tt class = "docutils literal" > bits< / tt > is the size of the < a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a > (specified in bits).
`` val`` is the value to initialize the bits to. If not specified
all bits are initialized to 0.< / p >
< p > The constructor taking a pointer < tt class = "docutils literal" > b< / tt > and < tt class = "docutils literal" > bits< / tt > copies a < a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a >
from the specified buffer, and < tt class = "docutils literal" > bits< / tt > number of bits (rounded up to
the nearest byte boundry).< / p >
< a name = "borrow_bytes()" > < / a > < / div >
< div class = "section" id = "borrow-bytes" >
< h2 > borrow_bytes()< / h2 >
< pre class = "literal-block" >
void < strong > borrow_bytes< / strong > (char* b, int bits);
< / pre >
< p > assigns a < a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a > pointed to < tt class = "docutils literal" > b< / tt > of < tt class = "docutils literal" > bits< / tt > number of bits, without
taking ownership of the buffer. This is a way to avoid copying data and
yet provide a raw buffer to functions that may operate on the < a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a >
type. It is the user's responsibility to make sure the passed-in buffer's
life time exceeds all uses of the < a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a > .< / p >
< a name = "assign()" > < / a > < / div >
< div class = "section" id = "assign" >
< h2 > assign()< / h2 >
< pre class = "literal-block" >
void < strong > assign< / strong > (char const* b, int bits);
< / pre >
< p > copy < a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a > from buffer < tt class = "docutils literal" > b< / tt > of < tt class = "docutils literal" > bits< / tt > number of bits, rounded up to
the nearest byte boundary.< / p >
< a name = "operator[]()" > < / a >
< a name = "get_bit()" > < / a > < / div >
< div class = "section" id = "operator-get-bit" >
< h2 > operator[]() get_bit()< / h2 >
< pre class = "literal-block" >
bool < strong > get_bit< / strong > (int index) const;
bool < strong > operator[]< / strong > (int index) const;
< / pre >
< p > query bit at < tt class = "docutils literal" > index< / tt > . Returns true if bit is 1, otherwise false.< / p >
< a name = "set_bit()" > < / a >
< a name = "clear_bit()" > < / a > < / div >
< div class = "section" id = "set-bit-clear-bit" >
< h2 > set_bit() clear_bit()< / h2 >
< pre class = "literal-block" >
void < strong > clear_bit< / strong > (int index);
void < strong > set_bit< / strong > (int index);
< / pre >
< p > set bit at < tt class = "docutils literal" > index< / tt > to 0 (clear_bit) or 1 (set_bit).< / p >
< a name = "all_set()" > < / a > < / div >
< div class = "section" id = "all-set" >
< h2 > all_set()< / h2 >
< pre class = "literal-block" >
bool < strong > all_set< / strong > () const;
< / pre >
< p > returns true if all bits in the < a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a > are set< / p >
< a name = "size()" > < / a > < / div >
< div class = "section" id = "size" >
< h2 > size()< / h2 >
< pre class = "literal-block" >
std::size_t < strong > size< / strong > () const;
< / pre >
< p > returns the size of the < a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a > in bits.< / p >
< a name = "empty()" > < / a > < / div >
< div class = "section" id = "empty" >
< h2 > empty()< / h2 >
< pre class = "literal-block" >
bool < strong > empty< / strong > () const;
< / pre >
< p > returns true if the < a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a > has zero size.< / p >
< a name = "bytes()" > < / a > < / div >
< div class = "section" id = "bytes" >
< h2 > bytes()< / h2 >
< pre class = "literal-block" >
char const* < strong > bytes< / strong > () const;
< / pre >
< p > returns a pointer to the internal buffer of the < a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a > .< / p >
< a name = "operator=()" > < / a > < / div >
< div class = "section" id = "operator" >
< h2 > operator=()< / h2 >
< pre class = "literal-block" >
bitfield& < strong > operator=< / strong > (bitfield const& rhs);
< / pre >
< p > copy operator< / p >
< a name = "count()" > < / a > < / div >
< div class = "section" id = "count" >
< h2 > count()< / h2 >
< pre class = "literal-block" >
int < strong > count< / strong > () const;
< / pre >
< p > count the number of bits in the < a class = "reference external" href = "reference-Utility.html#bitfield" > bitfield< / a > that are set to 1.< / p >
< a name = "sha1_hash" > < / a > < / div >
< / div >
< div class = "section" id = "sha1-hash" >
< h1 > sha1_hash< / h1 >
< p > Declared in " < a class = "reference external" href = "../include/libtorrent/sha1_hash.hpp" > libtorrent/sha1_hash.hpp< / a > " < / p >
< p > This type holds a SHA-1 digest or any other kind of 20 byte
sequence. It implements a number of convenience functions, such
as bit operations, comparison operators etc.< / p >
< p > In libtorrent it is primarily used to hold info-hashes, piece-hashes,
peer IDs, node IDs etc.< / p >
< pre class = "literal-block" >
class sha1_hash
{
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**sha1_hash** ();
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static sha1_hash < strong > max< / strong > ();
static sha1_hash < strong > min< / strong > ();
explicit < strong > sha1_hash< / strong > (char const* s);
void < strong > assign< / strong > (char const* str);
explicit < strong > sha1_hash< / strong > (std::string const& s);
void < strong > assign< / strong > (std::string const& s);
void < strong > clear< / strong > ();
bool < strong > is_all_zeros< / strong > () const;
sha1_hash& < strong > operator< < =< / strong > (int n);
sha1_hash& < strong > operator> > =< / strong > (int n);
bool < strong > operator!=< / strong > (sha1_hash const& n) const;
bool < strong > operator< < / strong > (sha1_hash const& n) const;
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bool < strong > operator==< / strong > (sha1_hash const& n) const;
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sha1_hash < strong > operator~< / strong > ();
sha1_hash < strong > operator^< / strong > (sha1_hash const& n) const;
sha1_hash& < strong > operator^=< / strong > (sha1_hash const& n);
sha1_hash < strong > operator& < / strong > (sha1_hash const& n) const;
sha1_hash& < strong > operator& =< / strong > (sha1_hash const& n);
sha1_hash& < strong > operator|=< / strong > (sha1_hash const& n);
unsigned char& < strong > operator[]< / strong > (int i);
unsigned char const& < strong > operator[]< / strong > (int i) const;
const_iterator < strong > begin< / strong > () const;
iterator < strong > begin< / strong > ();
iterator < strong > end< / strong > ();
const_iterator < strong > end< / strong > () const;
std::string < strong > to_string< / strong > () const;
static const int size = number_size;
};
< / pre >
< a name = "sha1_hash()" > < / a > < div class = "section" id = "id18" >
< h2 > sha1_hash()< / h2 >
< pre class = "literal-block" >
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**sha1_hash** ();
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< / pre >
< p > constructs an all-sero sha1-hash< / p >
< a name = "max()" > < / a > < / div >
< div class = "section" id = "max" >
< h2 > max()< / h2 >
< pre class = "literal-block" >
static sha1_hash < strong > max< / strong > ();
< / pre >
< p > returns an all-F sha1-hash. i.e. the maximum value
representable by a 160 bit number (20 bytes). This is
a static member function.< / p >
< a name = "min()" > < / a > < / div >
< div class = "section" id = "min" >
< h2 > min()< / h2 >
< pre class = "literal-block" >
static sha1_hash < strong > min< / strong > ();
< / pre >
< p > returns an all-zero sha1-hash. i.e. the minimum value
representable by a 160 bit number (20 bytes). This is
a static member function.< / p >
< a name = "assign()" > < / a >
< a name = "sha1_hash()" > < / a > < / div >
< div class = "section" id = "assign-sha1-hash" >
< h2 > assign() sha1_hash()< / h2 >
< pre class = "literal-block" >
explicit < strong > sha1_hash< / strong > (char const* s);
void < strong > assign< / strong > (char const* str);
explicit < strong > sha1_hash< / strong > (std::string const& s);
void < strong > assign< / strong > (std::string const& s);
< / pre >
< p > copies 20 bytes from the pointer provided, into the sha1-hash.
The passed in string MUST be at least 20 bytes. NULL terminators
are ignored, < tt class = "docutils literal" > s< / tt > is treated like a raw memory buffer.< / p >
< a name = "clear()" > < / a > < / div >
< div class = "section" id = "clear" >
< h2 > clear()< / h2 >
< pre class = "literal-block" >
void < strong > clear< / strong > ();
< / pre >
< p > set the sha1-hash to all zeroes.< / p >
< a name = "is_all_zeros()" > < / a > < / div >
< div class = "section" id = "is-all-zeros" >
< h2 > is_all_zeros()< / h2 >
< pre class = "literal-block" >
bool < strong > is_all_zeros< / strong > () const;
< / pre >
< p > return true if the sha1-hash is all zero.< / p >
< a name = "operator<<=()" > < / a > < / div >
< div class = "section" id = "id19" >
< h2 > operator< < =()< / h2 >
< pre class = "literal-block" >
sha1_hash& < strong > operator< < =< / strong > (int n);
< / pre >
< p > shift left < tt class = "docutils literal" > n< / tt > bits.< / p >
< a name = "operator>>=()" > < / a > < / div >
< div class = "section" id = "id20" >
< h2 > operator> > =()< / h2 >
< pre class = "literal-block" >
sha1_hash& < strong > operator> > =< / strong > (int n);
< / pre >
< p > shift r < tt class = "docutils literal" > n< / tt > bits.< / p >
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< a name = "operator!=()" > < / a >
< a name = "operator<()" > < / a >
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< a name = "operator==()" > < / a > < / div >
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< div class = "section" id = "operator-operator-operator" >
< h2 > operator!=() operator< () operator==()< / h2 >
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< pre class = "literal-block" >
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bool < strong > operator!=< / strong > (sha1_hash const& n) const;
bool < strong > operator< < / strong > (sha1_hash const& n) const;
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bool < strong > operator==< / strong > (sha1_hash const& n) const;
< / pre >
< p > standard comparison operators< / p >
< a name = "operator~()" > < / a > < / div >
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< div class = "section" id = "id21" >
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< h2 > operator~()< / h2 >
< pre class = "literal-block" >
sha1_hash < strong > operator~< / strong > ();
< / pre >
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< p > returns a bit-wise negated copy of the sha1-hash< / p >
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< a name = "operator^()" > < / a > < / div >
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< div class = "section" id = "id22" >
< h2 > operator^()< / h2 >
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< pre class = "literal-block" >
sha1_hash < strong > operator^< / strong > (sha1_hash const& n) const;
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< / pre >
< p > returns the bit-wise XOR of the two sha1-hashes.< / p >
< a name = "operator^=()" > < / a > < / div >
< div class = "section" id = "id23" >
< h2 > operator^=()< / h2 >
< pre class = "literal-block" >
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sha1_hash& < strong > operator^=< / strong > (sha1_hash const& n);
< / pre >
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< p > in-place bit-wise XOR with the passed in < a class = "reference external" href = "reference-Utility.html#sha1_hash" > sha1_hash< / a > .< / p >
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< a name = "operator&()" > < / a > < / div >
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< div class = "section" id = "id25" >
< h2 > operator& ()< / h2 >
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< pre class = "literal-block" >
sha1_hash < strong > operator& < / strong > (sha1_hash const& n) const;
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< / pre >
< p > returns the bit-wise AND of the two sha1-hashes.< / p >
< a name = "operator&=()" > < / a > < / div >
< div class = "section" id = "id26" >
< h2 > operator& =()< / h2 >
< pre class = "literal-block" >
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sha1_hash& < strong > operator& =< / strong > (sha1_hash const& n);
< / pre >
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< p > in-place bit-wise AND of the passed in < a class = "reference external" href = "reference-Utility.html#sha1_hash" > sha1_hash< / a > < / p >
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< a name = "operator|=()" > < / a > < / div >
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< div class = "section" id = "id28" >
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< h2 > operator|=()< / h2 >
< pre class = "literal-block" >
sha1_hash& < strong > operator|=< / strong > (sha1_hash const& n);
< / pre >
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< p > in-place bit-wise OR of the two sha1-hash.< / p >
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< a name = "operator[]()" > < / a > < / div >
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< div class = "section" id = "id29" >
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< h2 > operator[]()< / h2 >
< pre class = "literal-block" >
unsigned char& < strong > operator[]< / strong > (int i);
unsigned char const& < strong > operator[]< / strong > (int i) const;
< / pre >
< p > accessors for specific bytes< / p >
< a name = "begin()" > < / a >
< a name = "end()" > < / a > < / div >
< div class = "section" id = "begin-end" >
< h2 > begin() end()< / h2 >
< pre class = "literal-block" >
const_iterator < strong > begin< / strong > () const;
iterator < strong > begin< / strong > ();
iterator < strong > end< / strong > ();
const_iterator < strong > end< / strong > () const;
< / pre >
< p > start and end iterators for the hash. The value type
of these iterators is < tt class = "docutils literal" > unsigned char< / tt > .< / p >
< a name = "to_string()" > < / a > < / div >
< div class = "section" id = "to-string" >
< h2 > to_string()< / h2 >
< pre class = "literal-block" >
std::string < strong > to_string< / strong > () const;
< / pre >
< p > return a copy of the 20 bytes representing the sha1-hash as a std::string.
It's still a binary string with 20 binary characters.< / p >
< a name = "number_size" > < / a > < dl class = "docutils" >
< dt > number_size< / dt >
< dd > the number of bytes of the number< / dd >
< / dl >
< a name = "identify_client()" > < / a > < / div >
< div class = "section" id = "identify-client" >
< h2 > identify_client()< / h2 >
< p > Declared in " < a class = "reference external" href = "../include/libtorrent/identify_client.hpp" > libtorrent/identify_client.hpp< / a > " < / p >
< pre class = "literal-block" >
std::string < strong > identify_client< / strong > (const peer_id& p);
< / pre >
< p > This function is declared in the header < tt class = "docutils literal" > < libtorrent/identify_client.hpp> < / tt > . It can can be used
to extract a string describing a client version from its peer-id. It will recognize most clients
that have this kind of identification in the peer-id.< / p >
< a name = "client_fingerprint()" > < / a > < / div >
< div class = "section" id = "client-fingerprint" >
< h2 > client_fingerprint()< / h2 >
< p > Declared in " < a class = "reference external" href = "../include/libtorrent/identify_client.hpp" > libtorrent/identify_client.hpp< / a > " < / p >
< pre class = "literal-block" >
boost::optional< fingerprint> < strong > client_fingerprint< / strong > (peer_id const& p);
< / pre >
< p > Returns an optional fingerprint if any can be identified from the peer id. This can be used
to automate the identification of clients. It will not be able to identify peers with non-
standard encodings. Only Azureus style, Shadow's style and Mainline style. This function is
declared in the header < tt class = "docutils literal" > < libtorrent/identify_client.hpp> < / tt > .< / p >
< a name = "operator<<()" > < / a > < / div >
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< div class = "section" id = "id32" >
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< h2 > operator< < ()< / h2 >
< p > Declared in " < a class = "reference external" href = "../include/libtorrent/sha1_hash.hpp" > libtorrent/sha1_hash.hpp< / a > " < / p >
< pre class = "literal-block" >
inline std::ostream& < strong > operator< < < / strong > (std::ostream& os, sha1_hash const& peer);
< / pre >
< p > print a < a class = "reference external" href = "reference-Utility.html#sha1_hash" > sha1_hash< / a > object to an ostream as 40 hexadecimal digits< / p >
< a name = "operator>>()" > < / a > < / div >
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< div class = "section" id = "id35" >
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< h2 > operator> > ()< / h2 >
< p > Declared in " < a class = "reference external" href = "../include/libtorrent/sha1_hash.hpp" > libtorrent/sha1_hash.hpp< / a > " < / p >
< pre class = "literal-block" >
inline std::istream& < strong > operator> > < / strong > (std::istream& is, sha1_hash& peer);
< / pre >
< p > read 40 hexadecimal digits from an istream into a < a class = "reference external" href = "reference-Utility.html#sha1_hash" > sha1_hash< / a > < / p >
< a name = "sleep()" > < / a > < / div >
< div class = "section" id = "sleep" >
< h2 > sleep()< / h2 >
< p > Declared in " < a class = "reference external" href = "../include/libtorrent/thread.hpp" > libtorrent/thread.hpp< / a > " < / p >
< pre class = "literal-block" >
void < strong > sleep< / strong > (int milliseconds);
< / pre >
< p > pauses the calling thread at least for the specified
number of milliseconds< / p >
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