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33 lines
1004 B
Go
33 lines
1004 B
Go
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// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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// See page 362.
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//
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// The version of this program that appeared in the first and second
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// printings did not comply with the proposed rules for passing
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// pointers between Go and C, described here:
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// https://github.com/golang/proposal/blob/master/design/12416-cgo-pointers.md
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//
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// The version below, which appears in the third printing,
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// has been corrected. See bzip2.go for explanation.
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//!+
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/* This file is gopl.io/ch13/bzip/bzip2.c, */
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/* a simple wrapper for libbzip2 suitable for cgo. */
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#include <bzlib.h>
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int bz2compress(bz_stream *s, int action,
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char *in, unsigned *inlen, char *out, unsigned *outlen) {
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s->next_in = in;
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s->avail_in = *inlen;
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s->next_out = out;
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s->avail_out = *outlen;
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int r = BZ2_bzCompress(s, action);
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*inlen -= s->avail_in;
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*outlen -= s->avail_out;
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s->next_in = s->next_out = NULL;
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return r;
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}
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//!-
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