[#COMP_compress_block]
= COMP_compress_block
:mrdocs:

Compress a block of data.

== Synopsis

Declared in `<openssl/comp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
COMP_compress_block(
    xref:COMP_CTX.adoc[COMP_CTX]* ctx,
    unsigned char* out,
    int olen,
    unsigned char* in,
    int ilen);
----

== Return Value

Number of bytes written to `out,` or ‐1 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Compression context.
| *out*
| Output buffer for compressed data.
| *olen*
| Capacity of `out` in bytes.
| *in*
| Input data to compress.
| *ilen*
| Length of `in` in bytes.
|===


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