summaryrefslogtreecommitdiff
path: root/src/journal/compress.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/journal/compress.c')
-rw-r--r--src/journal/compress.c116
1 files changed, 23 insertions, 93 deletions
diff --git a/src/journal/compress.c b/src/journal/compress.c
index 1a3d2cdd80..78935fee74 100644
--- a/src/journal/compress.c
+++ b/src/journal/compress.c
@@ -58,7 +58,8 @@ static const char* const object_compressed_table[_OBJECT_COMPRESSED_MAX] = {
DEFINE_STRING_TABLE_LOOKUP(object_compressed, int);
-int compress_blob_xz(const void *src, uint64_t src_size, void *dst, size_t *dst_size) {
+int compress_blob_xz(const void *src, uint64_t src_size,
+ void *dst, size_t dst_alloc_size, size_t *dst_size) {
#ifdef HAVE_XZ
static const lzma_options_lzma opt = {
1u << 20u, NULL, 0, LZMA_LC_DEFAULT, LZMA_LP_DEFAULT,
@@ -74,6 +75,7 @@ int compress_blob_xz(const void *src, uint64_t src_size, void *dst, size_t *dst_
assert(src);
assert(src_size > 0);
assert(dst);
+ assert(dst_alloc_size > 0);
assert(dst_size);
/* Returns < 0 if we couldn't compress the data or the
@@ -83,7 +85,7 @@ int compress_blob_xz(const void *src, uint64_t src_size, void *dst, size_t *dst_
return -ENOBUFS;
ret = lzma_stream_buffer_encode((lzma_filter*) filters, LZMA_CHECK_NONE, NULL,
- src, src_size, dst, &out_pos, src_size - 1);
+ src, src_size, dst, &out_pos, dst_alloc_size);
if (ret != LZMA_OK)
return -ENOBUFS;
@@ -94,13 +96,15 @@ int compress_blob_xz(const void *src, uint64_t src_size, void *dst, size_t *dst_
#endif
}
-int compress_blob_lz4(const void *src, uint64_t src_size, void *dst, size_t *dst_size) {
+int compress_blob_lz4(const void *src, uint64_t src_size,
+ void *dst, size_t dst_alloc_size, size_t *dst_size) {
#ifdef HAVE_LZ4
int r;
assert(src);
assert(src_size > 0);
assert(dst);
+ assert(dst_alloc_size > 0);
assert(dst_size);
/* Returns < 0 if we couldn't compress the data or the
@@ -109,7 +113,7 @@ int compress_blob_lz4(const void *src, uint64_t src_size, void *dst, size_t *dst
if (src_size < 9)
return -ENOBUFS;
- r = LZ4_compress_limitedOutput(src, dst + 8, src_size, src_size - 8 - 1);
+ r = LZ4_compress_limitedOutput(src, dst + 8, src_size, (int) dst_alloc_size - 8);
if (r <= 0)
return -ENOBUFS;
@@ -306,6 +310,7 @@ int decompress_startswith_lz4(const void *src, uint64_t src_size,
* prefix */
int r;
+ size_t size;
assert(src);
assert(src_size > 0);
@@ -322,10 +327,18 @@ int decompress_startswith_lz4(const void *src, uint64_t src_size,
r = LZ4_decompress_safe_partial(src + 8, *buffer, src_size - 8,
prefix_len + 1, *buffer_size);
+ if (r >= 0)
+ size = (unsigned) r;
+ else {
+ /* lz4 always tries to decode full "sequence", so in
+ * pathological cases might need to decompress the
+ * full field. */
+ r = decompress_blob_lz4(src, src_size, buffer, buffer_size, &size, 0);
+ if (r < 0)
+ return r;
+ }
- if (r < 0)
- return -EBADMSG;
- if ((unsigned) r >= prefix_len + 1)
+ if (size >= prefix_len + 1)
return memcmp(*buffer, prefix, prefix_len) == 0 &&
((const uint8_t*) *buffer)[prefix_len] == extra;
else
@@ -438,7 +451,7 @@ int compress_stream_lz4(int fdf, int fdt, uint64_t max_bytes) {
_cleanup_(LZ4F_freeCompressionContextp) LZ4F_compressionContext_t ctx = NULL;
_cleanup_free_ char *buf = NULL;
char *src = NULL;
- size_t size, n, total_in = 0, total_out = 0, offset = 0, frame_size;
+ size_t size, n, total_in = 0, total_out, offset = 0, frame_size;
struct stat st;
int r;
static const LZ4F_compressOptions_t options = {
@@ -461,7 +474,7 @@ int compress_stream_lz4(int fdf, int fdt, uint64_t max_bytes) {
if (!buf)
return -ENOMEM;
- n = offset = LZ4F_compressBegin(ctx, buf, size, &preferences);
+ n = offset = total_out = LZ4F_compressBegin(ctx, buf, size, &preferences);
if (LZ4F_isError(n))
return -EINVAL;
@@ -599,80 +612,8 @@ int decompress_stream_xz(int fdf, int fdt, uint64_t max_bytes) {
#endif
}
+int decompress_stream_lz4(int in, int out, uint64_t max_bytes) {
#ifdef HAVE_LZ4
-static int decompress_stream_lz4_v1(int fdf, int fdt, uint64_t max_bytes) {
-
- _cleanup_free_ char *buf = NULL, *out = NULL;
- size_t buf_size = 0;
- LZ4_streamDecode_t lz4_data = {};
- le32_t header;
- size_t total_in = sizeof(header), total_out = 0;
-
- assert(fdf >= 0);
- assert(fdt >= 0);
-
- out = malloc(4*LZ4_BUFSIZE);
- if (!out)
- return -ENOMEM;
-
- for (;;) {
- ssize_t m;
- int r;
-
- r = loop_read_exact(fdf, &header, sizeof(header), false);
- if (r < 0)
- return r;
-
- m = le32toh(header);
- if (m == 0)
- break;
-
- /* We refuse to use a bigger decompression buffer than
- * the one used for compression by 4 times. This means
- * that compression buffer size can be enlarged 4
- * times. This can be changed, but old binaries might
- * not accept buffers compressed by newer binaries then.
- */
- if (m > LZ4_COMPRESSBOUND(LZ4_BUFSIZE * 4)) {
- log_debug("Compressed stream block too big: %zd bytes", m);
- return -ENOBUFS;
- }
-
- total_in += sizeof(header) + m;
-
- if (!GREEDY_REALLOC(buf, buf_size, m))
- return -ENOMEM;
-
- r = loop_read_exact(fdf, buf, m, false);
- if (r < 0)
- return r;
-
- r = LZ4_decompress_safe_continue(&lz4_data, buf, out, m, 4*LZ4_BUFSIZE);
- if (r <= 0) {
- log_debug("LZ4 decompression failed (legacy format).");
- return -EBADMSG;
- }
-
- total_out += r;
-
- if (max_bytes != (uint64_t) -1 && (uint64_t) total_out > max_bytes) {
- log_debug("Decompressed stream longer than %" PRIu64 " bytes", max_bytes);
- return -EFBIG;
- }
-
- r = loop_write(fdt, out, r, false);
- if (r < 0)
- return r;
- }
-
- log_debug("LZ4 decompression finished (legacy format, %zu -> %zu bytes, %.1f%%)",
- total_in, total_out,
- (double) total_out / total_in * 100);
-
- return 0;
-}
-
-static int decompress_stream_lz4_v2(int in, int out, uint64_t max_bytes) {
size_t c;
_cleanup_(LZ4F_freeDecompressionContextp) LZ4F_decompressionContext_t ctx = NULL;
_cleanup_free_ char *buf = NULL;
@@ -726,17 +667,6 @@ static int decompress_stream_lz4_v2(int in, int out, uint64_t max_bytes) {
cleanup:
munmap(src, st.st_size);
return r;
-}
-#endif
-
-int decompress_stream_lz4(int fdf, int fdt, uint64_t max_bytes) {
-#ifdef HAVE_LZ4
- int r;
-
- r = decompress_stream_lz4_v2(fdf, fdt, max_bytes);
- if (r == -EBADMSG)
- r = decompress_stream_lz4_v1(fdf, fdt, max_bytes);
- return r;
#else
log_debug("Cannot decompress file. Compiled without LZ4 support.");
return -EPROTONOSUPPORT;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-26 05:12:02 +0000