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Diffstat (limited to 'lib/fstream/compress/bzip2.c')
-rw-r--r--lib/fstream/compress/bzip2.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/lib/fstream/compress/bzip2.c b/lib/fstream/compress/bzip2.c
new file mode 100644
index 0000000..3ca425a
--- /dev/null
+++ b/lib/fstream/compress/bzip2.c
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * bzip2.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "../internal.h"
+
+#include <bzlib.h>
+
+typedef struct {
+ ostream_comp_t base;
+
+ bz_stream strm;
+} ostream_bzip2_t;
+
+static int flush_inbuf(ostream_comp_t *base, bool finish)
+{
+ ostream_bzip2_t *bzip2 = (ostream_bzip2_t *)base;
+ size_t have;
+ int ret;
+
+ bzip2->strm.next_in = (char *)base->inbuf;
+ bzip2->strm.avail_in = base->inbuf_used;
+
+ for (;;) {
+ bzip2->strm.next_out = (char *)base->outbuf;
+ bzip2->strm.avail_out = sizeof(base->outbuf);
+
+ ret = BZ2_bzCompress(&bzip2->strm, finish ? BZ_FINISH : BZ_RUN);
+
+ if (ret < 0 && ret != BZ_OUTBUFF_FULL) {
+ fprintf(stderr, "%s: internal error in bzip2 "
+ "compressor.\n",
+ base->wrapped->get_filename(base->wrapped));
+ return -1;
+ }
+
+ have = sizeof(base->outbuf) - bzip2->strm.avail_out;
+
+ if (base->wrapped->append(base->wrapped, base->outbuf, have))
+ return -1;
+
+ if (ret == BZ_STREAM_END || ret == BZ_OUTBUFF_FULL ||
+ bzip2->strm.avail_in == 0) {
+ break;
+ }
+ }
+
+ if (bzip2->strm.avail_in > 0) {
+ memmove(base->inbuf, bzip2->strm.next_in,
+ bzip2->strm.avail_in);
+ }
+
+ base->inbuf_used = bzip2->strm.avail_in;
+ return 0;
+}
+
+static void cleanup(ostream_comp_t *base)
+{
+ ostream_bzip2_t *bzip2 = (ostream_bzip2_t *)base;
+
+ BZ2_bzCompressEnd(&bzip2->strm);
+}
+
+ostream_comp_t *ostream_bzip2_create(const char *filename)
+{
+ ostream_bzip2_t *bzip2 = calloc(1, sizeof(*bzip2));
+ ostream_comp_t *base = (ostream_comp_t *)bzip2;
+
+ if (bzip2 == NULL) {
+ fprintf(stderr, "%s: creating bzip2 compressor: %s.\n",
+ filename, strerror(errno));
+ return NULL;
+ }
+
+ if (BZ2_bzCompressInit(&bzip2->strm, 9, 0, 30) != BZ_OK) {
+ fprintf(stderr, "%s: error initializing bzip2 compressor.\n",
+ filename);
+ free(bzip2);
+ return NULL;
+ }
+
+ base->flush_inbuf = flush_inbuf;
+ base->cleanup = cleanup;
+ return base;
+}