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-rw-r--r-- | comm/third_party/botan/src/lib/filters/pipe.h | 379 |
1 files changed, 379 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/filters/pipe.h b/comm/third_party/botan/src/lib/filters/pipe.h new file mode 100644 index 0000000000..03b5160835 --- /dev/null +++ b/comm/third_party/botan/src/lib/filters/pipe.h @@ -0,0 +1,379 @@ +/* +* Pipe +* (C) 1999-2007 Jack Lloyd +* 2012 Markus Wanner +* +* Botan is released under the Simplified BSD License (see license.txt) +*/ + +#ifndef BOTAN_PIPE_H_ +#define BOTAN_PIPE_H_ + +#include <botan/data_src.h> +#include <botan/exceptn.h> +#include <initializer_list> +#include <iosfwd> + +namespace Botan { + +class Filter; +class Output_Buffers; + +/** +* This class represents pipe objects. +* A set of filters can be placed into a pipe, and information flows +* through the pipe until it reaches the end, where the output is +* collected for retrieval. If you're familiar with the Unix shell +* environment, this design will sound quite familiar. +*/ +class BOTAN_PUBLIC_API(2,0) Pipe final : public DataSource + { + public: + /** + * An opaque type that identifies a message in this Pipe + */ + typedef size_t message_id; + + /** + * Exception if you use an invalid message as an argument to + * read, remaining, etc + */ + class BOTAN_PUBLIC_API(2,0) Invalid_Message_Number final : public Invalid_Argument + { + public: + /** + * @param where the error occurred + * @param msg the invalid message id that was used + */ + Invalid_Message_Number(const std::string& where, message_id msg) : + Invalid_Argument("Pipe::" + where + ": Invalid message number " + + std::to_string(msg)) + {} + }; + + /** + * A meta-id for whatever the last message is + */ + static const message_id LAST_MESSAGE; + + /** + * A meta-id for the default message (set with set_default_msg) + */ + static const message_id DEFAULT_MESSAGE; + + /** + * Write input to the pipe, i.e. to its first filter. + * @param in the byte array to write + * @param length the length of the byte array in + */ + void write(const uint8_t in[], size_t length); + + /** + * Write input to the pipe, i.e. to its first filter. + * @param in the secure_vector containing the data to write + */ + void write(const secure_vector<uint8_t>& in) + { write(in.data(), in.size()); } + + /** + * Write input to the pipe, i.e. to its first filter. + * @param in the std::vector containing the data to write + */ + void write(const std::vector<uint8_t>& in) + { write(in.data(), in.size()); } + + /** + * Write input to the pipe, i.e. to its first filter. + * @param in the string containing the data to write + */ + void write(const std::string& in); + + /** + * Write input to the pipe, i.e. to its first filter. + * @param in the DataSource to read the data from + */ + void write(DataSource& in); + + /** + * Write input to the pipe, i.e. to its first filter. + * @param in a single byte to be written + */ + void write(uint8_t in); + + /** + * Perform start_msg(), write() and end_msg() sequentially. + * @param in the byte array containing the data to write + * @param length the length of the byte array to write + */ + void process_msg(const uint8_t in[], size_t length); + + /** + * Perform start_msg(), write() and end_msg() sequentially. + * @param in the secure_vector containing the data to write + */ + void process_msg(const secure_vector<uint8_t>& in); + + /** + * Perform start_msg(), write() and end_msg() sequentially. + * @param in the secure_vector containing the data to write + */ + void process_msg(const std::vector<uint8_t>& in); + + /** + * Perform start_msg(), write() and end_msg() sequentially. + * @param in the string containing the data to write + */ + void process_msg(const std::string& in); + + /** + * Perform start_msg(), write() and end_msg() sequentially. + * @param in the DataSource providing the data to write + */ + void process_msg(DataSource& in); + + /** + * Find out how many bytes are ready to read. + * @param msg the number identifying the message + * for which the information is desired + * @return number of bytes that can still be read + */ + size_t remaining(message_id msg = DEFAULT_MESSAGE) const BOTAN_WARN_UNUSED_RESULT; + + /** + * Read the default message from the pipe. Moves the internal + * offset so that every call to read will return a new portion of + * the message. + * + * @param output the byte array to write the read bytes to + * @param length the length of the byte array output + * @return number of bytes actually read into output + */ + size_t read(uint8_t output[], size_t length) override BOTAN_WARN_UNUSED_RESULT; + + /** + * Read a specified message from the pipe. Moves the internal + * offset so that every call to read will return a new portion of + * the message. + * @param output the byte array to write the read bytes to + * @param length the length of the byte array output + * @param msg the number identifying the message to read from + * @return number of bytes actually read into output + */ + size_t read(uint8_t output[], size_t length, message_id msg) BOTAN_WARN_UNUSED_RESULT; + + /** + * Read a single byte from the pipe. Moves the internal offset so + * that every call to read will return a new portion of the + * message. + * + * @param output the byte to write the result to + * @param msg the message to read from + * @return number of bytes actually read into output + */ + size_t read(uint8_t& output, message_id msg = DEFAULT_MESSAGE) BOTAN_WARN_UNUSED_RESULT; + + /** + * Read the full contents of the pipe. + * @param msg the number identifying the message to read from + * @return secure_vector holding the contents of the pipe + */ + secure_vector<uint8_t> read_all(message_id msg = DEFAULT_MESSAGE) BOTAN_WARN_UNUSED_RESULT; + + /** + * Read the full contents of the pipe. + * @param msg the number identifying the message to read from + * @return string holding the contents of the pipe + */ + std::string read_all_as_string(message_id msg = DEFAULT_MESSAGE) BOTAN_WARN_UNUSED_RESULT; + + /** + * Read from the default message but do not modify the internal + * offset. Consecutive calls to peek() will return portions of + * the message starting at the same position. + * @param output the byte array to write the peeked message part to + * @param length the length of the byte array output + * @param offset the offset from the current position in message + * @return number of bytes actually peeked and written into output + */ + size_t peek(uint8_t output[], size_t length, size_t offset) const override BOTAN_WARN_UNUSED_RESULT; + + /** Read from the specified message but do not modify the + * internal offset. Consecutive calls to peek() will return + * portions of the message starting at the same position. + * @param output the byte array to write the peeked message part to + * @param length the length of the byte array output + * @param offset the offset from the current position in message + * @param msg the number identifying the message to peek from + * @return number of bytes actually peeked and written into output + */ + size_t peek(uint8_t output[], size_t length, + size_t offset, message_id msg) const BOTAN_WARN_UNUSED_RESULT; + + /** Read a single byte from the specified message but do not + * modify the internal offset. Consecutive calls to peek() will + * return portions of the message starting at the same position. + * @param output the byte to write the peeked message byte to + * @param offset the offset from the current position in message + * @param msg the number identifying the message to peek from + * @return number of bytes actually peeked and written into output + */ + size_t peek(uint8_t& output, size_t offset, + message_id msg = DEFAULT_MESSAGE) const BOTAN_WARN_UNUSED_RESULT; + + /** + * @return the number of bytes read from the default message. + */ + size_t get_bytes_read() const override; + + /** + * @return the number of bytes read from the specified message. + */ + size_t get_bytes_read(message_id msg) const; + + bool check_available(size_t n) override; + bool check_available_msg(size_t n, message_id msg); + + /** + * @return currently set default message + */ + size_t default_msg() const { return m_default_read; } + + /** + * Set the default message + * @param msg the number identifying the message which is going to + * be the new default message + */ + void set_default_msg(message_id msg); + + /** + * Get the number of messages the are in this pipe. + * @return number of messages the are in this pipe + */ + message_id message_count() const; + + /** + * Test whether this pipe has any data that can be read from. + * @return true if there is more data to read, false otherwise + */ + bool end_of_data() const override; + + /** + * Start a new message in the pipe. A potential other message in this pipe + * must be closed with end_msg() before this function may be called. + */ + void start_msg(); + + /** + * End the current message. + */ + void end_msg(); + + /** + * Insert a new filter at the front of the pipe + * Deprecated because runtime modification of Pipes is deprecated. + * You can instead use prepend_filter which only works before the first + * message is processed. + * @param filt the new filter to insert + */ + BOTAN_DEPRECATED("Runtime modification of Pipe deprecated") + void prepend(Filter* filt); + + /** + * Insert a new filter at the back of the pipe + * Deprecated because runtime modification of Pipes is deprecated. + * You can instead use append_filter which only works before the first + * message is processed. + * @param filt the new filter to insert + */ + BOTAN_DEPRECATED("Runtime modification of Pipe deprecated") + void append(Filter* filt); + + /** + * Remove the first filter at the front of the pipe. + */ + BOTAN_DEPRECATED("Runtime modification of Pipe deprecated") + void pop(); + + /** + * Reset this pipe to an empty pipe. + */ + BOTAN_DEPRECATED("Runtime modification of Pipe deprecated") + void reset(); + + /** + * Append a new filter onto the filter sequence. This may only be + * called immediately after initial construction, before _any_ + * calls to start_msg have been made. + * + * This function (unlike append) is not deprecated, as it allows + * only modification of the pipe at initialization (before use) + * rather than after messages have been processed. + */ + void append_filter(Filter* filt); + + /** + * Prepend a new filter onto the filter sequence. This may only be + * called immediately after initial construction, before _any_ + * calls to start_msg have been made. + * + * This function (unlike prepend) is not deprecated, as it allows + * only modification of the pipe at initialization (before use) + * rather than after messages have been processed. + */ + void prepend_filter(Filter* filt); + + /** + * Construct a Pipe of up to four filters. The filters are set up + * in the same order as the arguments. + */ + Pipe(Filter* = nullptr, Filter* = nullptr, + Filter* = nullptr, Filter* = nullptr); + + /** + * Construct a Pipe from a list of filters + * @param filters the set of filters to use + */ + explicit Pipe(std::initializer_list<Filter*> filters); + + Pipe(const Pipe&) = delete; + Pipe& operator=(const Pipe&) = delete; + + ~Pipe(); + private: + void destruct(Filter*); + void do_append(Filter* filt); + void do_prepend(Filter* filt); + void find_endpoints(Filter*); + void clear_endpoints(Filter*); + + message_id get_message_no(const std::string&, message_id) const; + + Filter* m_pipe; + std::unique_ptr<Output_Buffers> m_outputs; + message_id m_default_read; + bool m_inside_msg; + }; + +/** +* Stream output operator; dumps the results from pipe's default +* message to the output stream. +* @param out an output stream +* @param pipe the pipe +*/ +BOTAN_PUBLIC_API(2,0) std::ostream& operator<<(std::ostream& out, Pipe& pipe); + +/** +* Stream input operator; dumps the remaining bytes of input +* to the (assumed open) pipe message. +* @param in the input stream +* @param pipe the pipe +*/ +BOTAN_PUBLIC_API(2,0) std::istream& operator>>(std::istream& in, Pipe& pipe); + +} + +#if defined(BOTAN_HAS_PIPE_UNIXFD_IO) + #include <botan/fd_unix.h> +#endif + +#endif |