Previous  Up  Next

Module Unpack_buffer

module Unpack_buffer: sig .. end
A buffer for incremental decoding of an input stream.

An Unpack_buffer.t is a buffer to which one can feed strings, and then unpack from the buffer to produce a queue of values.

module Unpack_one: sig .. end
type ('value, 'partial_unpack) t 
val invariant : ('a, 'b) t -> unit
val create : ?partial_unpack:'partial_unpack ->
       ('value, 'partial_unpack) Unpack_one.t ->
       ('value, 'partial_unpack) t
val create_bin_prot : 'a Bin_prot.Type_class.reader -> ('a, unit) t
create_bin_prot reader returns an unpack buffer that unpacks the "size-prefixed" bin_prot encoding, in which a value is encoded by first writing the length of the bin_prot data as a 64-bit int, and then writing the bin_prot data itself. This encoding makes it trivial to know if enough data is available in the buffer, so there is no need to represent partially unpacked values, and hence 'partial_unpack = unit.
val is_empty : ('a, 'b) t -> bool Or_error.t
is_empty t returns true if t has no unconsumed bytes, and false if it does. is_empty returns an error if t has encountered an unpacking error.
val feed : ?pos:int ->
       ?len:int -> ('a, 'b) t -> Bigstring.t -> unit Or_error.t
feed t buf ?pos ?len adds the specified substring of buf to t's buffer. It returns an error if t has encountered an unpacking error.
val feed_string : ?pos:int -> ?len:int -> ('a, 'b) t -> string -> unit Or_error.t
val unpack : ('value, 'a) t -> 'value Std_internal.Queue.t Or_error.t
unpack t unpacks all the values that it can from t. The resulting queue will be empty if nothing could be unpacked. If there is an unpacking error, unpack returns an error, and subsequent feed and unpack operations on t will return that same error. I.e. no more data can be fed to or unpacked from t.
val debug : bool Pervasives.ref
debug controls whether invariants are checked at each call. Setting this to true can make things very slow.
val sexp_of_t : ('value -> Sexplib.Sexp.t) ->
       ('partial_unpack -> Sexplib.Sexp.t) ->
       ('value, 'partial_unpack) t -> Sexplib.Sexp.t

create_bin_prot reader returns an unpack buffer that unpacks the "size-prefixed" bin_prot encoding, in which a value is encoded by first writing the length of the bin_prot data as a 64-bit int, and then writing the bin_prot data itself. This encoding makes it trivial to know if enough data is available in the buffer, so there is no need to represent partially unpacked values, and hence 'partial_unpack = unit.

is_empty t returns true if t has no unconsumed bytes, and false if it does. is_empty returns an error if t has encountered an unpacking error.

feed t buf ?pos ?len adds the specified substring of buf to t's buffer. It returns an error if t has encountered an unpacking error.

unpack t unpacks all the values that it can from t. The resulting queue will be empty if nothing could be unpacked. If there is an unpacking error, unpack returns an error, and subsequent feed and unpack operations on t will return that same error. I.e. no more data can be fed to or unpacked from t.

debug controls whether invariants are checked at each call. Setting this to true can make things very slow.