Unpack raw vectors
Break a raw vector into chunks according to the values in
A string, see 'Details'
Raw vector(s) to be unpacked
template values are:
'a' - A null padded string (as of R-2.8.0, strings cannot contain embedded nulls)
'A' - A space padded string
'b' - An ascending bit order binary vector, (must be a multiple of 8 long)
'B' - An descending bit order binary vector, (must be a multiple of 8 long)
'C' - An unsigned char (octet) value
'v' - An unsigned short (16-bit) in "VAX" (little-endian) order
'V' - An unsigned long (32-bit) in "VAX" (little-endian) order
'f' - A single-precision float
'd' - A double-precision float
'x' - A null byte
'H' - A raw byte
Values 'a', 'A', and 'H' may be followed by a repeat value. A repeat value of '*' will cause the remainder of the bytes in
values to be placed
in the last element.
'/' allows packing and unpacking of a sequence of values where the packed structure contains a packed item count followed by the packed items themselves.
If there are more
template values or if the repeat count of a field
or a group is larger than what the remainder ... allows,
NULL. If ... is longer than what is described by
template, the rest is ignored.
A list with an element for each value in
When unpacking, 'A' strips trailing whitespace and nulls and 'a' returns data verbatim (but with embedded nulls removed, since strings cannot contain embedded nulls as of R-2.8.0).
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