perf tools: Add lzma decompression support for kernel module

In short, Fedora compresses kernel modules now (since version 21) with
lzma compression.

Adding lzma decompress support into the dso.c:compressions array
introduced by Namhyung earlier.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-2glp65kdtbrk0gblmirsjsnt@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 95 insertions, 0 deletions

diff --git a/tools/perf/util/lzma.c b/tools/perf/util/lzma.c
new file mode 100644
index 000000000000..95a1acb61245
--- /dev/null
+++ b/tools/perf/util/lzma.c
@@ -0,0 +1,95 @@
+#include <lzma.h>
+#include <stdio.h>
+#include <linux/compiler.h>
+#include "util.h"
+#include "debug.h"
+
+#define BUFSIZE 8192
+
+static const char *lzma_strerror(lzma_ret ret)
+{
+        switch ((int) ret) {
+        case LZMA_MEM_ERROR:
+                return "Memory allocation failed";
+        case LZMA_OPTIONS_ERROR:
+                return "Unsupported decompressor flags";
+        case LZMA_FORMAT_ERROR:
+                return "The input is not in the .xz format";
+        case LZMA_DATA_ERROR:
+                return "Compressed file is corrupt";
+        case LZMA_BUF_ERROR:
+                return "Compressed file is truncated or otherwise corrupt";
+        default:
+                return "Unknown error, possibly a bug";
+        }
+}
+
+int lzma_decompress_to_file(const char *input, int output_fd)
+{
+        lzma_action action = LZMA_RUN;
+        lzma_stream strm   = LZMA_STREAM_INIT;
+        lzma_ret ret;
+
+        u8 buf_in[BUFSIZE];
+        u8 buf_out[BUFSIZE];
+        FILE *infile;
+
+        infile = fopen(input, "rb");
+        if (!infile) {
+                pr_err("lzma: fopen failed on %s: '%s'\n",
+                       input, strerror(errno));
+                return -1;
+        }
+
+        ret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
+        if (ret != LZMA_OK) {
+                pr_err("lzma: lzma_stream_decoder failed %s (%d)\n",
+                        lzma_strerror(ret), ret);
+                return -1;
+        }
+
+        strm.next_in   = NULL;
+        strm.avail_in  = 0;
+        strm.next_out  = buf_out;
+        strm.avail_out = sizeof(buf_out);
+
+        while (1) {
+                if (strm.avail_in == 0 && !feof(infile)) {
+                        strm.next_in  = buf_in;
+                        strm.avail_in = fread(buf_in, 1, sizeof(buf_in), infile);
+
+                        if (ferror(infile)) {
+                                pr_err("lzma: read error: %s\n", strerror(errno));
+                                return -1;
+                        }
+
+                        if (feof(infile))
+                                action = LZMA_FINISH;
+                }
+
+                ret = lzma_code(&strm, action);
+
+                if (strm.avail_out == 0 || ret == LZMA_STREAM_END) {
+                        ssize_t write_size = sizeof(buf_out) - strm.avail_out;
+
+                        if (writen(output_fd, buf_out, write_size) != write_size) {
+                                pr_err("lzma: write error: %s\n", strerror(errno));
+                                return -1;
+                        }
+
+                        strm.next_out  = buf_out;
+                        strm.avail_out = sizeof(buf_out);
+                }
+
+                if (ret != LZMA_OK) {
+                        if (ret == LZMA_STREAM_END)
+                                return 0;
+
+                        pr_err("lzma: failed %s\n", lzma_strerror(ret));
+                        return -1;
+                }
+        }
+
+        fclose(infile);
+        return 0;
+}