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-rw-r--r--src/journal/compress.c154
-rw-r--r--src/journal/compress.h4
-rw-r--r--src/journal/test-compress.c54
3 files changed, 209 insertions, 3 deletions
diff --git a/src/journal/compress.c b/src/journal/compress.c
index cafe8f4f54..f36c430801 100644
--- a/src/journal/compress.c
+++ b/src/journal/compress.c
@@ -22,10 +22,12 @@
#include <assert.h>
#include <stdlib.h>
#include <string.h>
+#include <unistd.h>
#include <lzma.h>
-#include "macro.h"
#include "compress.h"
+#include "macro.h"
+#include "util.h"
bool compress_blob(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size) {
lzma_ret ret;
@@ -40,12 +42,12 @@ bool compress_blob(const void *src, uint64_t src_size, void *dst, uint64_t *dst_
* compressed result is longer than the original */
ret = lzma_easy_buffer_encode(LZMA_PRESET_DEFAULT, LZMA_CHECK_NONE, NULL,
- src, src_size, dst, &out_pos, *dst_size);
+ src, src_size, dst, &out_pos, src_size);
if (ret != LZMA_OK)
return false;
/* Is it actually shorter? */
- if (out_pos == *dst_size)
+ if (out_pos == src_size)
return false;
*dst_size = out_pos;
@@ -200,3 +202,149 @@ fail:
return b;
}
+
+int compress_stream(int fdf, int fdt, off_t max_bytes) {
+ _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT;
+ lzma_ret ret;
+
+ uint8_t buf[BUFSIZ], out[BUFSIZ];
+ lzma_action action = LZMA_RUN;
+
+ assert(fdf >= 0);
+ assert(fdt >= 0);
+
+ ret = lzma_easy_encoder(&s, LZMA_PRESET_DEFAULT, LZMA_CHECK_CRC64);
+ if (ret != LZMA_OK) {
+ log_error("Failed to initialize XZ encoder: code %d", ret);
+ return -EINVAL;
+ }
+
+ for (;;) {
+ if (s.avail_in == 0 && action == LZMA_RUN) {
+ size_t m = sizeof(buf);
+ ssize_t n;
+
+ if (max_bytes != -1 && m > (size_t) max_bytes)
+ m = max_bytes;
+
+ n = read(fdf, buf, m);
+ if (n < 0)
+ return -errno;
+ if (n == 0)
+ action = LZMA_FINISH;
+ else {
+ s.next_in = buf;
+ s.avail_in = n;
+
+ if (max_bytes != -1) {
+ assert(max_bytes >= n);
+ max_bytes -= n;
+ }
+ }
+ }
+
+ if (s.avail_out == 0) {
+ s.next_out = out;
+ s.avail_out = sizeof(out);
+ }
+
+ ret = lzma_code(&s, action);
+ if (ret != LZMA_OK && ret != LZMA_STREAM_END) {
+ log_error("Compression failed: code %d", ret);
+ return -EBADMSG;
+ }
+
+ if (s.avail_out == 0 || ret == LZMA_STREAM_END) {
+ ssize_t n, k;
+
+ n = sizeof(out) - s.avail_out;
+
+ errno = 0;
+ k = loop_write(fdt, out, n, false);
+ if (k < 0)
+ return k;
+ if (k != n)
+ return errno ? -errno : -EIO;
+
+ if (ret == LZMA_STREAM_END) {
+ log_debug("Compression finished (%zu -> %zu bytes, %.1f%%)",
+ s.total_in, s.total_out,
+ (double) s.total_out / s.total_in * 100);
+
+ return 0;
+ }
+ }
+ }
+}
+
+int decompress_stream(int fdf, int fdt, off_t max_bytes) {
+ _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT;
+ lzma_ret ret;
+
+ uint8_t buf[BUFSIZ], out[BUFSIZ];
+ lzma_action action = LZMA_RUN;
+
+ assert(fdf >= 0);
+ assert(fdt >= 0);
+
+ ret = lzma_stream_decoder(&s, UINT64_MAX, 0);
+ if (ret != LZMA_OK) {
+ log_error("Failed to initialize XZ decoder: code %d", ret);
+ return -EINVAL;
+ }
+
+ for (;;) {
+ if (s.avail_in == 0 && action == LZMA_RUN) {
+ ssize_t n;
+
+ n = read(fdf, buf, sizeof(buf));
+ if (n < 0)
+ return -errno;
+ if (n == 0)
+ action = LZMA_FINISH;
+ else {
+ s.next_in = buf;
+ s.avail_in = n;
+ }
+ }
+
+ if (s.avail_out == 0) {
+ s.next_out = out;
+ s.avail_out = sizeof(out);
+ }
+
+ ret = lzma_code(&s, action);
+ if (ret != LZMA_OK && ret != LZMA_STREAM_END) {
+ log_error("Decompression failed: code %d", ret);
+ return -EBADMSG;
+ }
+
+ if (s.avail_out == 0 || ret == LZMA_STREAM_END) {
+ ssize_t n, k;
+
+ n = sizeof(out) - s.avail_out;
+
+ if (max_bytes != -1) {
+ if (max_bytes < n)
+ return -E2BIG;
+
+ max_bytes -= n;
+ }
+
+ errno = 0;
+ k = loop_write(fdt, out, n, false);
+ if (k < 0)
+ return k;
+ if (k != n)
+ return errno ? -errno : -EIO;
+
+ if (ret == LZMA_STREAM_END) {
+ log_debug("Decompression finished (%zu -> %zu bytes, %.1f%%)",
+ s.total_in, s.total_out,
+ (double) s.total_out / s.total_in * 100);
+
+ return 0;
+ }
+ }
+ }
+}
diff --git a/src/journal/compress.h b/src/journal/compress.h
index 2b87e73a26..f37a6b3d14 100644
--- a/src/journal/compress.h
+++ b/src/journal/compress.h
@@ -23,6 +23,7 @@
#include <inttypes.h>
#include <stdbool.h>
+#include <unistd.h>
bool compress_blob(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size);
@@ -33,3 +34,6 @@ bool uncompress_startswith(const void *src, uint64_t src_size,
void **buffer, uint64_t *buffer_size,
const void *prefix, uint64_t prefix_len,
uint8_t extra);
+
+int compress_stream(int fdf, int fdt, off_t max_size);
+int decompress_stream(int fdf, int fdt, off_t max_size);
diff --git a/src/journal/test-compress.c b/src/journal/test-compress.c
index 15b3f9aa00..b098ef93a8 100644
--- a/src/journal/test-compress.c
+++ b/src/journal/test-compress.c
@@ -68,9 +68,63 @@ static void test_uncompress_startswith(void) {
"barbarbar", 9, ' '));
}
+static void test_compress_stream(const char *srcfile) {
+ _cleanup_close_ int src = -1, dst = -1, dst2 = -1;
+ char pattern[] = "/tmp/systemd-test.xz.XXXXXX",
+ pattern2[] = "/tmp/systemd-test.xz.XXXXXX";
+ int r;
+ _cleanup_free_ char *cmd, *cmd2;
+ struct stat st = {};
+
+ log_debug("/* create source from %s */", srcfile);
+
+ assert_se((src = open(srcfile, O_RDONLY|O_CLOEXEC)) >= 0);
+
+ log_debug("/* test compression */");
+
+ assert_se((dst = mkostemp_safe(pattern, O_RDWR|O_CLOEXEC)) >= 0);
+
+ r = compress_stream(src, dst, -1);
+ assert(r == 0);
+
+ assert_se(asprintf(&cmd, "xzcat %s | diff %s -", pattern, srcfile) > 0);
+ assert_se(system(cmd) == 0);
+
+ log_debug("/* test decompression */");
+
+ assert_se((dst2 = mkostemp_safe(pattern2, O_RDWR|O_CLOEXEC)) >= 0);
+
+ assert_se(stat(srcfile, &st) == 0);
+
+ assert_se(lseek(dst, 0, SEEK_SET) == 0);
+ r = decompress_stream(dst, dst2, st.st_size);
+ assert(r == 0);
+
+ assert_se(asprintf(&cmd2, "diff %s %s", srcfile, pattern2) > 0);
+ assert_se(system(cmd2) == 0);
+
+ log_debug("/* test faulty decompression */");
+
+ assert_se(lseek(dst, 1, SEEK_SET) == 1);
+ r = decompress_stream(dst, dst2, st.st_size);
+ assert(r == -EBADMSG);
+
+ assert_se(lseek(dst, 0, SEEK_SET) == 0);
+ assert_se(lseek(dst2, 0, SEEK_SET) == 0);
+ r = decompress_stream(dst, dst2, st.st_size - 1);
+ assert(r == -E2BIG);
+
+ assert_se(unlink(pattern) == 0);
+ assert_se(unlink(pattern2) == 0);
+}
+
int main(int argc, char *argv[]) {
+
+ log_set_max_level(LOG_DEBUG);
+
test_compress_uncompress();
test_uncompress_startswith();
+ test_compress_stream(argv[0]);
return 0;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-07 21:40:39 +0000