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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-09-14 14:59:31 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-09-16 09:34:35 +0200
commitc9f5cfd3df2706da940a39d6d816ad084ba80fbd (patch)
tree3aac86238ce840c3c25ff89892f6109c081f60d8 /lib/fstream/uncompress/xz.c
parentf757737060d4daebb24a32e90d912661428708a8 (diff)
Implement istream decompression support
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/fstream/uncompress/xz.c')
-rw-r--r--lib/fstream/uncompress/xz.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/lib/fstream/uncompress/xz.c b/lib/fstream/uncompress/xz.c
new file mode 100644
index 0000000..0e48468
--- /dev/null
+++ b/lib/fstream/uncompress/xz.c
@@ -0,0 +1,93 @@
+/* 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 {
+ istream_comp_t base;
+
+ lzma_stream strm;
+} istream_xz_t;
+
+static int precache(istream_t *base)
+{
+ istream_xz_t *xz = (istream_xz_t *)base;
+ istream_t *wrapped = ((istream_comp_t *)base)->wrapped;
+ lzma_ret ret_xz;
+ int ret;
+
+ for (;;) {
+ ret = istream_precache(wrapped);
+ if (ret != 0)
+ return ret;
+
+ xz->strm.avail_in = wrapped->buffer_used;
+ xz->strm.next_in = wrapped->buffer;
+
+ xz->strm.avail_out = BUFSZ - base->buffer_used;
+ xz->strm.next_out = base->buffer + base->buffer_used;
+
+ ret_xz = lzma_code(&xz->strm, LZMA_RUN);
+
+ base->buffer_used = BUFSZ - xz->strm.avail_out;
+ wrapped->buffer_offset = wrapped->buffer_used -
+ xz->strm.avail_in;
+
+ if (ret_xz == LZMA_BUF_ERROR)
+ break;
+
+ if (ret_xz == LZMA_STREAM_END) {
+ base->eof = true;
+ break;
+ }
+
+ if (ret_xz != LZMA_OK) {
+ fprintf(stderr,
+ "%s: internal error in xz decoder.\n",
+ wrapped->get_filename(wrapped));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static void cleanup(istream_comp_t *base)
+{
+ istream_xz_t *xz = (istream_xz_t *)base;
+
+ lzma_end(&xz->strm);
+}
+
+istream_comp_t *istream_xz_create(const char *filename)
+{
+ istream_xz_t *xz = calloc(1, sizeof(*xz));
+ istream_comp_t *base = (istream_comp_t *)xz;
+ sqfs_u64 memlimit = 65 * 1024 * 1024;
+ lzma_ret ret_xz;
+
+ if (xz == NULL) {
+ fprintf(stderr, "%s: creating xz decoder: %s.\n",
+ filename, strerror(errno));
+ return NULL;
+ }
+
+ ret_xz = lzma_stream_decoder(&xz->strm, memlimit, 0);
+
+ if (ret_xz != LZMA_OK) {
+ fprintf(stderr,
+ "%s: error initializing xz decoder.\n",
+ filename);
+ free(xz);
+ return NULL;
+ }
+
+ ((istream_t *)base)->precache = precache;
+ base->cleanup = cleanup;
+ return base;
+}