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.Dd November 9, 2018
.Dt UNCOMPRESS 3
.Os
.
.Sh NAME
.Nm uncompress ,
.Nm uncompress2
.Nd decompress source buffer into destination buffer
.
.Sh LIBRARY
.Lb libz
.
.Sh SYNOPSIS
.In zlib.h
.
.Ft int
.Fo uncompress
.Fa "Bytef *dest"
.Fa "uLongf *destLen"
.Fa "const Bytef *source"
.Fa "uLong sourceLen"
.Fc
.
.Ft int
.Fo uncompress2
.Fa "Bytef *dest"
.Fa "uLongf *destLen"
.Fa "const Bytef *source"
.Fa "uLong *sourceLen"
.Fc
.
.Sh DESCRIPTION
Decompresses the source buffer into the destination buffer.
.Fa sourceLen
is the byte length of the source buffer.
Upon entry,
.Fa destLen
is the total size of the destination buffer,
which must be large enough to hold the entire uncompressed data.
.Po
The size of the uncompressed data
must have been saved previously by the compressor
and transmitted to the decompressor
by some mechanism outside the scope of this compression library.
.Pc
Upon exit,
.Fa destLen
is the actual size of the uncompressed data.
.
.Pp
.Fn uncompress2
is the same as
.Fn uncompress ,
except that
.Fa sourceLen
is a pointer,
where the length of the source is
.Fa *sourceLen .
On return,
.Fa *sourceLen
is the number of source bytes consumed.
.
.Sh RETURN VALUES
.Fn uncompress
returns
.Dv Z_OK
if success,
.Dv Z_MEM_ERROR
if there was not enough memory,
.Dv Z_BUF_ERROR
if there was not enough room in the output buffer,
or
.Dv Z_DATA_ERROR
if the input data was corrupted or incomplete.
In the case where there is not enough room,
.Fn uncompress
will fill the output buffer
with the uncompressed data up to that point.
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