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-rw-r--r--lib/io/compress/xz.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/lib/io/compress/xz.c b/lib/io/compress/xz.c
new file mode 100644
index 0000000..65bda0b
--- /dev/null
+++ b/lib/io/compress/xz.c
@@ -0,0 +1,80 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * xz.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "../internal.h"
+
+#include <lzma.h>
+
+typedef struct {
+ ostream_comp_t base;
+
+ lzma_stream strm;
+} ostream_xz_t;
+
+static int flush_inbuf(ostream_comp_t *base, bool finish)
+{
+ ostream_xz_t *xz = (ostream_xz_t *)base;
+ lzma_ret ret_xz;
+ size_t have;
+
+ xz->strm.next_in = base->inbuf;
+ xz->strm.avail_in = base->inbuf_used;
+
+ do {
+ xz->strm.next_out = base->outbuf;
+ xz->strm.avail_out = BUFSZ;
+
+ ret_xz = lzma_code(&xz->strm, finish ? LZMA_FINISH : LZMA_RUN);
+
+ if ((ret_xz != LZMA_OK) && (ret_xz != LZMA_STREAM_END)) {
+ fprintf(stderr,
+ "%s: internal error in XZ compressor.\n",
+ base->wrapped->get_filename(base->wrapped));
+ return -1;
+ }
+
+ have = BUFSZ - xz->strm.avail_out;
+
+ if (base->wrapped->append(base->wrapped, base->outbuf, have))
+ return -1;
+ } while (xz->strm.avail_out == 0);
+
+ base->inbuf_used = 0;
+ return 0;
+}
+
+static void cleanup(ostream_comp_t *base)
+{
+ ostream_xz_t *xz = (ostream_xz_t *)base;
+
+ lzma_end(&xz->strm);
+}
+
+ostream_comp_t *ostream_xz_create(const char *filename)
+{
+ ostream_xz_t *xz = calloc(1, sizeof(*xz));
+ ostream_comp_t *base = (ostream_comp_t *)xz;
+ lzma_ret ret_xz;
+
+ if (xz == NULL) {
+ fprintf(stderr, "%s: creating xz wrapper: %s.\n",
+ filename, strerror(errno));
+ return NULL;
+ }
+
+ ret_xz = lzma_easy_encoder(&xz->strm, LZMA_PRESET_DEFAULT,
+ LZMA_CHECK_CRC64);
+ if (ret_xz != LZMA_OK) {
+ fprintf(stderr, "%s: error initializing XZ compressor\n",
+ filename);
+ free(xz);
+ return NULL;
+ }
+
+ base->flush_inbuf = flush_inbuf;
+ base->cleanup = cleanup;
+ return base;
+}