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8b42b7e5e8
Add is_compressed callback to the compressions array, that returns 0 if the file is compressed or != 0 if not. The new callback is used to recognize the situation when we have a 'compressed' object, like: /lib/modules/.../drivers/net/ethernet/intel/igb/igb.ko.xz but we need to read its debug data from debuginfo files, which might not be compressed, like: /root/.debug/.build-id/d6/...c4b301f/debug So even for a 'compressed' object we read debug data from a plain uncompressed object. To keep this transparent, we detect this in decompress_kmodule() and return the file descriptor to the uncompressed file. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20180817094813.15086-11-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
87 lines
1.5 KiB
C
87 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <zlib.h>
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#include <linux/compiler.h>
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#include "util/compress.h"
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#include "util/util.h"
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#include "util/debug.h"
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#define CHUNK_SIZE 16384
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int gzip_decompress_to_file(const char *input, int output_fd)
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{
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int ret = Z_STREAM_ERROR;
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int input_fd;
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void *ptr;
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int len;
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struct stat stbuf;
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unsigned char buf[CHUNK_SIZE];
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z_stream zs = {
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.zalloc = Z_NULL,
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.zfree = Z_NULL,
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.opaque = Z_NULL,
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.avail_in = 0,
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.next_in = Z_NULL,
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};
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input_fd = open(input, O_RDONLY);
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if (input_fd < 0)
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return -1;
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if (fstat(input_fd, &stbuf) < 0)
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goto out_close;
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ptr = mmap(NULL, stbuf.st_size, PROT_READ, MAP_PRIVATE, input_fd, 0);
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if (ptr == MAP_FAILED)
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goto out_close;
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if (inflateInit2(&zs, 16 + MAX_WBITS) != Z_OK)
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goto out_unmap;
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zs.next_in = ptr;
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zs.avail_in = stbuf.st_size;
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do {
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zs.next_out = buf;
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zs.avail_out = CHUNK_SIZE;
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ret = inflate(&zs, Z_NO_FLUSH);
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switch (ret) {
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case Z_NEED_DICT:
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ret = Z_DATA_ERROR;
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/* fall through */
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case Z_DATA_ERROR:
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case Z_MEM_ERROR:
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goto out;
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default:
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break;
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}
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len = CHUNK_SIZE - zs.avail_out;
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if (writen(output_fd, buf, len) != len) {
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ret = Z_DATA_ERROR;
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goto out;
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}
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} while (ret != Z_STREAM_END);
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out:
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inflateEnd(&zs);
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out_unmap:
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munmap(ptr, stbuf.st_size);
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out_close:
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close(input_fd);
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return ret == Z_STREAM_END ? 0 : -1;
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}
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bool gzip_is_compressed(const char *input __maybe_unused)
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{
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return true;
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}
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