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-rw-r--r--src/journal/compress.c423
1 files changed, 385 insertions, 38 deletions
diff --git a/src/journal/compress.c b/src/journal/compress.c
index 37c55a8728..49d694ac28 100644
--- a/src/journal/compress.c
+++ b/src/journal/compress.c
@@ -23,13 +23,32 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
-#include <lzma.h>
+
+#ifdef HAVE_XZ
+# include <lzma.h>
+#endif
+
+#ifdef HAVE_LZ4
+# include <lz4.h>
+#endif
#include "compress.h"
#include "macro.h"
#include "util.h"
+#include "sparse-endian.h"
+#include "journal-def.h"
+
+#define ALIGN_8(l) ALIGN_TO(l, sizeof(size_t))
+
+static const char* const object_compressed_table[_OBJECT_COMPRESSED_MAX] = {
+ [OBJECT_COMPRESSED_XZ] = "XZ",
+ [OBJECT_COMPRESSED_LZ4] = "LZ4",
+};
-bool compress_blob(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size) {
+DEFINE_STRING_TABLE_LOOKUP(object_compressed, int);
+
+int compress_blob_xz(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size) {
+#ifdef HAVE_XZ
lzma_ret ret;
size_t out_pos = 0;
@@ -38,25 +57,54 @@ bool compress_blob(const void *src, uint64_t src_size, void *dst, uint64_t *dst_
assert(dst);
assert(dst_size);
- /* Returns false if we couldn't compress the data or the
+ /* Returns < 0 if we couldn't compress the data or the
* 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, src_size);
+ src, src_size, dst, &out_pos, src_size - 1);
if (ret != LZMA_OK)
- return false;
-
- /* Is it actually shorter? */
- if (out_pos == src_size)
- return false;
+ return -ENOBUFS;
*dst_size = out_pos;
- return true;
+ return 0;
+#else
+ return -EPROTONOSUPPORT;
+#endif
}
-bool uncompress_blob(const void *src, uint64_t src_size,
- void **dst, uint64_t *dst_alloc_size, uint64_t* dst_size, uint64_t dst_max) {
+int compress_blob_lz4(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size) {
+#ifdef HAVE_LZ4
+ int r;
+
+ assert(src);
+ assert(src_size > 0);
+ assert(dst);
+ assert(dst_size);
+
+ /* Returns < 0 if we couldn't compress the data or the
+ * compressed result is longer than the original */
+
+ if (src_size < 9)
+ return -ENOBUFS;
+ r = LZ4_compress_limitedOutput(src, dst + 8, src_size, src_size - 8 - 1);
+ if (r <= 0)
+ return -ENOBUFS;
+
+ *(le64_t*) dst = htole64(src_size);
+ *dst_size = r + 8;
+
+ return 0;
+#else
+ return -EPROTONOSUPPORT;
+#endif
+}
+
+
+int decompress_blob_xz(const void *src, uint64_t src_size,
+ void **dst, uint64_t *dst_alloc_size, uint64_t* dst_size, uint64_t dst_max) {
+
+#ifdef HAVE_XZ
_cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT;
lzma_ret ret;
uint64_t space;
@@ -70,7 +118,7 @@ bool uncompress_blob(const void *src, uint64_t src_size,
ret = lzma_stream_decoder(&s, UINT64_MAX, 0);
if (ret != LZMA_OK)
- return false;
+ return -ENOMEM;
space = MIN(src_size * 2, dst_max ?: (uint64_t) -1);
if (!greedy_realloc(dst, dst_alloc_size, space, 1))
@@ -89,15 +137,13 @@ bool uncompress_blob(const void *src, uint64_t src_size,
if (ret == LZMA_STREAM_END)
break;
-
- if (ret != LZMA_OK)
- return false;
+ else if (ret != LZMA_OK)
+ return -ENOMEM;
if (dst_max > 0 && (space - s.avail_out) >= dst_max)
break;
-
- if (dst_max > 0 && space == dst_max)
- return false;
+ else if (dst_max > 0 && space == dst_max)
+ return -ENOBUFS;
used = space - s.avail_out;
space = MIN(2 * space, dst_max ?: (uint64_t) -1);
@@ -109,18 +155,75 @@ bool uncompress_blob(const void *src, uint64_t src_size,
}
*dst_size = space - s.avail_out;
- return true;
+ return 0;
+#else
+ return -EPROTONOSUPPORT;
+#endif
}
-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 decompress_blob_lz4(const void *src, uint64_t src_size,
+ void **dst, uint64_t *dst_alloc_size, uint64_t* dst_size, uint64_t dst_max) {
+
+#ifdef HAVE_LZ4
+ char* out;
+ uint64_t size;
+ int r;
+ assert(src);
+ assert(src_size > 0);
+ assert(dst);
+ assert(dst_alloc_size);
+ assert(dst_size);
+ assert(*dst_alloc_size == 0 || *dst);
+
+ if (src_size <= 8)
+ return -EBADMSG;
+
+ size = le64toh( *(le64_t*)src );
+ if (size > *dst_alloc_size) {
+ out = realloc(*dst, size);
+ if (!out)
+ return -ENOMEM;
+ *dst = out;
+ *dst_alloc_size = size;
+ } else
+ out = *dst;
+
+ r = LZ4_decompress_safe(src + 8, out, src_size - 8, size);
+ if (r < 0 || (uint64_t) r != size)
+ return -EBADMSG;
+
+ *dst_size = size;
+ return 0;
+#else
+ return -EPROTONOSUPPORT;
+#endif
+}
+
+int decompress_blob(int compression,
+ const void *src, uint64_t src_size,
+ void **dst, uint64_t *dst_alloc_size, uint64_t* dst_size, uint64_t dst_max) {
+ if (compression == OBJECT_COMPRESSED_XZ)
+ return decompress_blob_xz(src, src_size,
+ dst, dst_alloc_size, dst_size, dst_max);
+ else if (compression == OBJECT_COMPRESSED_LZ4)
+ return decompress_blob_lz4(src, src_size,
+ dst, dst_alloc_size, dst_size, dst_max);
+ else
+ return -EBADMSG;
+}
+
+
+int decompress_startswith_xz(const void *src, uint64_t src_size,
+ void **buffer, uint64_t *buffer_size,
+ const void *prefix, uint64_t prefix_len,
+ uint8_t extra) {
+
+#ifdef HAVE_XZ
_cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT;
lzma_ret ret;
- /* Checks whether the uncompressed blob starts with the
+ /* Checks whether the decompressed blob starts with the
* mentioned prefix. The byte extra needs to follow the
* prefix */
@@ -133,10 +236,10 @@ bool uncompress_startswith(const void *src, uint64_t src_size,
ret = lzma_stream_decoder(&s, UINT64_MAX, 0);
if (ret != LZMA_OK)
- return false;
+ return -EBADMSG;
- if (!(greedy_realloc(buffer, buffer_size, prefix_len + 1, 1)))
- return false;
+ if (!(greedy_realloc(buffer, buffer_size, ALIGN_8(prefix_len + 1), 1)))
+ return -ENOMEM;
s.next_in = src;
s.avail_in = src_size;
@@ -148,25 +251,88 @@ bool uncompress_startswith(const void *src, uint64_t src_size,
ret = lzma_code(&s, LZMA_FINISH);
if (ret != LZMA_STREAM_END && ret != LZMA_OK)
- return false;
+ return -EBADMSG;
if (*buffer_size - s.avail_out >= prefix_len + 1)
return memcmp(*buffer, prefix, prefix_len) == 0 &&
((const uint8_t*) *buffer)[prefix_len] == extra;
if (ret == LZMA_STREAM_END)
- return false;
+ return 0;
s.avail_out += *buffer_size;
if (!(greedy_realloc(buffer, buffer_size, *buffer_size * 2, 1)))
- return false;
+ return -ENOMEM;
s.next_out = *buffer + *buffer_size - s.avail_out;
}
+
+#else
+ return -EPROTONOSUPPORT;
+#endif
+}
+
+int decompress_startswith_lz4(const void *src, uint64_t src_size,
+ void **buffer, uint64_t *buffer_size,
+ const void *prefix, uint64_t prefix_len,
+ uint8_t extra) {
+#ifdef HAVE_LZ4
+ /* Checks whether the decompressed blob starts with the
+ * mentioned prefix. The byte extra needs to follow the
+ * prefix */
+
+ int r;
+
+ assert(src);
+ assert(src_size > 0);
+ assert(buffer);
+ assert(buffer_size);
+ assert(prefix);
+ assert(*buffer_size == 0 || *buffer);
+
+ if (src_size <= 8)
+ return -EBADMSG;
+
+ if (!(greedy_realloc(buffer, buffer_size, ALIGN_8(prefix_len + 1), 1)))
+ return -ENOMEM;
+
+ r = LZ4_decompress_safe_partial(src + 8, *buffer, src_size - 8,
+ prefix_len + 1, *buffer_size);
+
+ if (r < 0)
+ return -EBADMSG;
+ if ((unsigned) r >= prefix_len + 1)
+ return memcmp(*buffer, prefix, prefix_len) == 0 &&
+ ((const uint8_t*) *buffer)[prefix_len] == extra;
+ else
+ return 0;
+
+#else
+ return -EPROTONOSUPPORT;
+#endif
}
-int compress_stream(int fdf, int fdt, uint32_t preset, off_t max_bytes) {
+int decompress_startswith(int compression,
+ const void *src, uint64_t src_size,
+ void **buffer, uint64_t *buffer_size,
+ const void *prefix, uint64_t prefix_len,
+ uint8_t extra) {
+ if (compression == OBJECT_COMPRESSED_XZ)
+ return decompress_startswith_xz(src, src_size,
+ buffer, buffer_size,
+ prefix, prefix_len,
+ extra);
+ else if (compression == OBJECT_COMPRESSED_LZ4)
+ return decompress_startswith_lz4(src, src_size,
+ buffer, buffer_size,
+ prefix, prefix_len,
+ extra);
+ else
+ return -EBADMSG;
+}
+
+int compress_stream_xz(int fdf, int fdt, off_t max_bytes) {
_cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT;
lzma_ret ret;
@@ -176,7 +342,7 @@ int compress_stream(int fdf, int fdt, uint32_t preset, off_t max_bytes) {
assert(fdf >= 0);
assert(fdt >= 0);
- ret = lzma_easy_encoder(&s, preset, LZMA_CHECK_CRC64);
+ 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;
@@ -230,7 +396,7 @@ int compress_stream(int fdf, int fdt, uint32_t preset, off_t max_bytes) {
return errno ? -errno : -EIO;
if (ret == LZMA_STREAM_END) {
- log_debug("Compression finished (%zu -> %zu bytes, %.1f%%)",
+ log_debug("XZ compression finished (%zu -> %zu bytes, %.1f%%)",
s.total_in, s.total_out,
(double) s.total_out / s.total_in * 100);
@@ -240,7 +406,91 @@ int compress_stream(int fdf, int fdt, uint32_t preset, off_t max_bytes) {
}
}
-int decompress_stream(int fdf, int fdt, off_t max_bytes) {
+#define LZ4_BUFSIZE (512*1024)
+
+int compress_stream_lz4(int fdf, int fdt, off_t max_bytes) {
+
+#ifdef HAVE_LZ4
+
+ _cleanup_free_ char *buf1 = NULL, *buf2 = NULL, *out = NULL;
+ char *buf;
+ LZ4_stream_t lz4_data = {};
+ le32_t header;
+ size_t total_in = 0, total_out = sizeof(header);
+ ssize_t n;
+
+ assert(fdf >= 0);
+ assert(fdt >= 0);
+
+ buf1 = malloc(LZ4_BUFSIZE);
+ buf2 = malloc(LZ4_BUFSIZE);
+ out = malloc(LZ4_COMPRESSBOUND(LZ4_BUFSIZE));
+ if (!buf1 || !buf2 || !out)
+ return log_oom();
+
+ buf = buf1;
+ for (;;) {
+ size_t m;
+ int r;
+
+ m = LZ4_BUFSIZE;
+ if (max_bytes != -1 && m > (size_t) max_bytes - total_in)
+ m = max_bytes - total_in;
+
+ n = read(fdf, buf, m);
+ if (n < 0)
+ return -errno;
+ if (n == 0)
+ break;
+
+ total_in += n;
+
+ r = LZ4_compress_limitedOutput_continue(&lz4_data, buf, out, n, n);
+ if (r == 0) {
+ log_debug("Compressed size exceeds original, aborting compression.");
+ return -ENOBUFS;
+ }
+
+ header = htole32(r);
+ errno = 0;
+
+ n = write(fdt, &header, sizeof(header));
+ if (n < 0)
+ return -errno;
+ if (n != sizeof(header))
+ return errno ? -errno : -EIO;
+
+ n = loop_write(fdt, out, r, false);
+ if (n < 0)
+ return n;
+ if (n != r)
+ return errno ? -errno : -EIO;
+
+ total_out += sizeof(header) + r;
+
+ buf = buf == buf1 ? buf2 : buf1;
+ }
+
+ header = htole32(0);
+ n = write(fdt, &header, sizeof(header));
+ if (n < 0)
+ return -errno;
+ if (n != sizeof(header))
+ return errno ? -errno : -EIO;
+
+ log_debug("LZ4 compression finished (%zu -> %zu bytes, %.1f%%)",
+ total_in, total_out,
+ (double) total_out / total_in * 100);
+
+ return 0;
+#else
+ return -EPROTONOSUPPORT;
+#endif
+}
+
+int decompress_stream_xz(int fdf, int fdt, off_t max_bytes) {
+
+#ifdef HAVE_XZ
_cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT;
lzma_ret ret;
@@ -253,7 +503,7 @@ int decompress_stream(int fdf, int fdt, off_t max_bytes) {
ret = lzma_stream_decoder(&s, UINT64_MAX, 0);
if (ret != LZMA_OK) {
log_error("Failed to initialize XZ decoder: code %d", ret);
- return -EINVAL;
+ return -ENOMEM;
}
for (;;) {
@@ -289,7 +539,7 @@ int decompress_stream(int fdf, int fdt, off_t max_bytes) {
if (max_bytes != -1) {
if (max_bytes < n)
- return -E2BIG;
+ return -EFBIG;
max_bytes -= n;
}
@@ -302,7 +552,7 @@ int decompress_stream(int fdf, int fdt, off_t max_bytes) {
return errno ? -errno : -EIO;
if (ret == LZMA_STREAM_END) {
- log_debug("Decompression finished (%zu -> %zu bytes, %.1f%%)",
+ log_debug("XZ decompression finished (%zu -> %zu bytes, %.1f%%)",
s.total_in, s.total_out,
(double) s.total_out / s.total_in * 100);
@@ -310,4 +560,101 @@ int decompress_stream(int fdf, int fdt, off_t max_bytes) {
}
}
}
+#else
+ log_error("Cannot decompress file. Compiled without XZ support.");
+ return -EPROTONOSUPPORT;
+#endif
+}
+
+int decompress_stream_lz4(int fdf, int fdt, off_t max_bytes) {
+
+#ifdef HAVE_LZ4
+ _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 log_oom();
+
+ for (;;) {
+ ssize_t n, m;
+ int r;
+
+ n = read(fdf, &header, sizeof(header));
+ if (n < 0)
+ return -errno;
+ if (n != sizeof(header))
+ return errno ? -errno : -EIO;
+
+ 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_error("Compressed stream block too big: %zd bytes", m);
+ return -EBADMSG;
+ }
+
+ total_in += sizeof(header) + m;
+
+ if (!GREEDY_REALLOC(buf, buf_size, m))
+ return log_oom();
+
+ errno = 0;
+ n = loop_read(fdf, buf, m, false);
+ if (n < 0)
+ return n;
+ if (n != m)
+ return errno ? -errno : -EIO;
+
+ r = LZ4_decompress_safe_continue(&lz4_data, buf, out, m, 4*LZ4_BUFSIZE);
+ if (r <= 0)
+ log_error("LZ4 decompression failed.");
+
+ total_out += r;
+
+ if (max_bytes != -1 && total_out > (size_t) max_bytes) {
+ log_debug("Decompressed stream longer than %zd bytes", max_bytes);
+ return -EFBIG;
+ }
+
+ errno = 0;
+ n = loop_write(fdt, out, r, false);
+ if (n < 0)
+ return n;
+ if (n != r)
+ return errno ? -errno : -EIO;
+ }
+
+ log_debug("LZ4 decompression finished (%zu -> %zu bytes, %.1f%%)",
+ total_in, total_out,
+ (double) total_out / total_in * 100);
+
+ return 0;
+#else
+ log_error("Cannot decompress file. Compiled without LZ4 support.");
+ return -EPROTONOSUPPORT;
+#endif
+}
+
+int decompress_stream(const char *filename, int fdf, int fdt, off_t max_bytes) {
+
+ if (endswith(filename, ".lz4"))
+ return decompress_stream_lz4(fdf, fdt, max_bytes);
+ else if (endswith(filename, ".xz"))
+ return decompress_stream_xz(fdf, fdt, max_bytes);
+ else
+ return -EPROTONOSUPPORT;
}
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