| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| |
| #include <inttypes.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/mman.h> |
| #include <unistd.h> |
| |
| #if HAVE_XZ |
| #include <lzma.h> |
| #endif |
| |
| #if HAVE_LZ4 |
| #include <lz4.h> |
| #include <lz4frame.h> |
| #endif |
| |
| #include "alloc-util.h" |
| #include "compress.h" |
| #include "fd-util.h" |
| #include "io-util.h" |
| #include "journal-def.h" |
| #include "macro.h" |
| #include "sparse-endian.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "util.h" |
| |
| #if HAVE_LZ4 |
| DEFINE_TRIVIAL_CLEANUP_FUNC(LZ4F_compressionContext_t, LZ4F_freeCompressionContext); |
| DEFINE_TRIVIAL_CLEANUP_FUNC(LZ4F_decompressionContext_t, LZ4F_freeDecompressionContext); |
| #endif |
| |
| #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", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(object_compressed, int); |
| |
| int compress_blob_xz(const void *src, uint64_t src_size, |
| void *dst, size_t dst_alloc_size, size_t *dst_size) { |
| #if HAVE_XZ |
| static const lzma_options_lzma opt = { |
| 1u << 20u, NULL, 0, LZMA_LC_DEFAULT, LZMA_LP_DEFAULT, |
| LZMA_PB_DEFAULT, LZMA_MODE_FAST, 128, LZMA_MF_HC3, 4 |
| }; |
| static const lzma_filter filters[] = { |
| { LZMA_FILTER_LZMA2, (lzma_options_lzma*) &opt }, |
| { LZMA_VLI_UNKNOWN, NULL } |
| }; |
| lzma_ret ret; |
| size_t out_pos = 0; |
| |
| 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 |
| * compressed result is longer than the original */ |
| |
| if (src_size < 80) |
| return -ENOBUFS; |
| |
| ret = lzma_stream_buffer_encode((lzma_filter*) filters, LZMA_CHECK_NONE, NULL, |
| src, src_size, dst, &out_pos, dst_alloc_size); |
| if (ret != LZMA_OK) |
| return -ENOBUFS; |
| |
| *dst_size = out_pos; |
| return 0; |
| #else |
| return -EPROTONOSUPPORT; |
| #endif |
| } |
| |
| int compress_blob_lz4(const void *src, uint64_t src_size, |
| void *dst, size_t dst_alloc_size, size_t *dst_size) { |
| #if 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 |
| * compressed result is longer than the original */ |
| |
| if (src_size < 9) |
| return -ENOBUFS; |
| |
| r = LZ4_compress_default(src, (char*)dst + 8, src_size, (int) dst_alloc_size - 8); |
| 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, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max) { |
| |
| #if HAVE_XZ |
| _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
| lzma_ret ret; |
| size_t space; |
| |
| assert(src); |
| assert(src_size > 0); |
| assert(dst); |
| assert(dst_alloc_size); |
| assert(dst_size); |
| assert(*dst_alloc_size == 0 || *dst); |
| |
| ret = lzma_stream_decoder(&s, UINT64_MAX, 0); |
| if (ret != LZMA_OK) |
| return -ENOMEM; |
| |
| space = MIN(src_size * 2, dst_max ?: (size_t) -1); |
| if (!greedy_realloc(dst, dst_alloc_size, space, 1)) |
| return -ENOMEM; |
| |
| s.next_in = src; |
| s.avail_in = src_size; |
| |
| s.next_out = *dst; |
| s.avail_out = space; |
| |
| for (;;) { |
| size_t used; |
| |
| ret = lzma_code(&s, LZMA_FINISH); |
| |
| if (ret == LZMA_STREAM_END) |
| break; |
| else if (ret != LZMA_OK) |
| return -ENOMEM; |
| |
| if (dst_max > 0 && (space - s.avail_out) >= dst_max) |
| break; |
| else if (dst_max > 0 && space == dst_max) |
| return -ENOBUFS; |
| |
| used = space - s.avail_out; |
| space = MIN(2 * space, dst_max ?: (size_t) -1); |
| if (!greedy_realloc(dst, dst_alloc_size, space, 1)) |
| return -ENOMEM; |
| |
| s.avail_out = space - used; |
| s.next_out = *(uint8_t**)dst + used; |
| } |
| |
| *dst_size = space - s.avail_out; |
| return 0; |
| #else |
| return -EPROTONOSUPPORT; |
| #endif |
| } |
| |
| int decompress_blob_lz4(const void *src, uint64_t src_size, |
| void **dst, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max) { |
| |
| #if HAVE_LZ4 |
| char* out; |
| int r, size; /* LZ4 uses int for size */ |
| |
| 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 < 0 || (unsigned) size != le64toh(*(le64_t*)src)) |
| return -EFBIG; |
| if ((size_t) 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((char*)src + 8, out, src_size - 8, size); |
| if (r < 0 || 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, size_t *dst_alloc_size, size_t* dst_size, size_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, size_t *buffer_size, |
| const void *prefix, size_t prefix_len, |
| uint8_t extra) { |
| |
| #if HAVE_XZ |
| _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
| lzma_ret ret; |
| |
| /* Checks whether the decompressed blob starts with the |
| * mentioned prefix. The byte extra needs to follow the |
| * prefix */ |
| |
| assert(src); |
| assert(src_size > 0); |
| assert(buffer); |
| assert(buffer_size); |
| assert(prefix); |
| assert(*buffer_size == 0 || *buffer); |
| |
| ret = lzma_stream_decoder(&s, UINT64_MAX, 0); |
| if (ret != LZMA_OK) |
| return -EBADMSG; |
| |
| if (!(greedy_realloc(buffer, buffer_size, ALIGN_8(prefix_len + 1), 1))) |
| return -ENOMEM; |
| |
| s.next_in = src; |
| s.avail_in = src_size; |
| |
| s.next_out = *buffer; |
| s.avail_out = *buffer_size; |
| |
| for (;;) { |
| ret = lzma_code(&s, LZMA_FINISH); |
| |
| if (!IN_SET(ret, LZMA_OK, LZMA_STREAM_END)) |
| 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 0; |
| |
| s.avail_out += *buffer_size; |
| |
| if (!(greedy_realloc(buffer, buffer_size, *buffer_size * 2, 1))) |
| return -ENOMEM; |
| |
| s.next_out = *(uint8_t**)buffer + *buffer_size - s.avail_out; |
| } |
| |
| #else |
| return -EPROTONOSUPPORT; |
| #endif |
| } |
| |
| int decompress_startswith_lz4(const void *src, uint64_t src_size, |
| void **buffer, size_t *buffer_size, |
| const void *prefix, size_t prefix_len, |
| uint8_t extra) { |
| #if 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((char*)src + 8, *buffer, src_size - 8, |
| prefix_len + 1, *buffer_size); |
| /* One lz4 < 1.8.3, we might get "failure" (r < 0), or "success" where |
| * just a part of the buffer is decompressed. But if we get a smaller |
| * amount of bytes than requested, we don't know whether there isn't enough |
| * data to fill the requested size or whether we just got a partial answer. |
| */ |
| if (r < 0 || (size_t) r < prefix_len + 1) { |
| size_t size; |
| |
| if (LZ4_versionNumber() >= 10803) |
| /* We trust that the newer lz4 decompresses the number of bytes we |
| * requested if available in the compressed string. */ |
| return 0; |
| |
| if (r > 0) |
| /* Compare what we have first, in case of mismatch we can |
| * shortcut the full comparison. */ |
| if (memcmp(*buffer, prefix, r) != 0) |
| return 0; |
| |
| /* Before version 1.8.3, lz4 always tries to decode full a "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 (size < prefix_len + 1) |
| return 0; |
| } |
| |
| return memcmp(*buffer, prefix, prefix_len) == 0 && |
| ((const uint8_t*) *buffer)[prefix_len] == extra; |
| #else |
| return -EPROTONOSUPPORT; |
| #endif |
| } |
| |
| int decompress_startswith(int compression, |
| const void *src, uint64_t src_size, |
| void **buffer, size_t *buffer_size, |
| const void *prefix, size_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, uint64_t max_bytes) { |
| #if HAVE_XZ |
| _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 %u", ret); |
| return -EINVAL; |
| } |
| |
| for (;;) { |
| if (s.avail_in == 0 && action == LZMA_RUN) { |
| size_t m = sizeof(buf); |
| ssize_t n; |
| |
| if (max_bytes != (uint64_t) -1 && (uint64_t) m > max_bytes) |
| m = (size_t) 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 != (uint64_t) -1) { |
| assert(max_bytes >= (uint64_t) n); |
| max_bytes -= n; |
| } |
| } |
| } |
| |
| if (s.avail_out == 0) { |
| s.next_out = out; |
| s.avail_out = sizeof(out); |
| } |
| |
| ret = lzma_code(&s, action); |
| if (!IN_SET(ret, LZMA_OK, LZMA_STREAM_END)) { |
| log_error("Compression failed: code %u", ret); |
| return -EBADMSG; |
| } |
| |
| if (s.avail_out == 0 || ret == LZMA_STREAM_END) { |
| ssize_t n, k; |
| |
| n = sizeof(out) - s.avail_out; |
| |
| k = loop_write(fdt, out, n, false); |
| if (k < 0) |
| return k; |
| |
| if (ret == LZMA_STREAM_END) { |
| log_debug("XZ compression finished (%"PRIu64" -> %"PRIu64" bytes, %.1f%%)", |
| s.total_in, s.total_out, |
| (double) s.total_out / s.total_in * 100); |
| |
| return 0; |
| } |
| } |
| } |
| #else |
| return -EPROTONOSUPPORT; |
| #endif |
| } |
| |
| #define LZ4_BUFSIZE (512*1024u) |
| |
| int compress_stream_lz4(int fdf, int fdt, uint64_t max_bytes) { |
| |
| #if HAVE_LZ4 |
| LZ4F_errorCode_t c; |
| _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, offset = 0, frame_size; |
| struct stat st; |
| int r; |
| static const LZ4F_compressOptions_t options = { |
| .stableSrc = 1, |
| }; |
| static const LZ4F_preferences_t preferences = { |
| .frameInfo.blockSizeID = 5, |
| }; |
| |
| c = LZ4F_createCompressionContext(&ctx, LZ4F_VERSION); |
| if (LZ4F_isError(c)) |
| return -ENOMEM; |
| |
| if (fstat(fdf, &st) < 0) |
| return log_debug_errno(errno, "fstat() failed: %m"); |
| |
| frame_size = LZ4F_compressBound(LZ4_BUFSIZE, &preferences); |
| size = frame_size + 64*1024; /* add some space for header and trailer */ |
| buf = malloc(size); |
| if (!buf) |
| return -ENOMEM; |
| |
| n = offset = total_out = LZ4F_compressBegin(ctx, buf, size, &preferences); |
| if (LZ4F_isError(n)) |
| return -EINVAL; |
| |
| src = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fdf, 0); |
| if (src == MAP_FAILED) |
| return -errno; |
| |
| log_debug("Buffer size is %zu bytes, header size %zu bytes.", size, n); |
| |
| while (total_in < (size_t) st.st_size) { |
| ssize_t k; |
| |
| k = MIN(LZ4_BUFSIZE, st.st_size - total_in); |
| n = LZ4F_compressUpdate(ctx, buf + offset, size - offset, |
| src + total_in, k, &options); |
| if (LZ4F_isError(n)) { |
| r = -ENOTRECOVERABLE; |
| goto cleanup; |
| } |
| |
| total_in += k; |
| offset += n; |
| total_out += n; |
| |
| if (max_bytes != (uint64_t) -1 && total_out > (size_t) max_bytes) { |
| log_debug("Compressed stream longer than %"PRIu64" bytes", max_bytes); |
| return -EFBIG; |
| } |
| |
| if (size - offset < frame_size + 4) { |
| k = loop_write(fdt, buf, offset, false); |
| if (k < 0) { |
| r = k; |
| goto cleanup; |
| } |
| offset = 0; |
| } |
| } |
| |
| n = LZ4F_compressEnd(ctx, buf + offset, size - offset, &options); |
| if (LZ4F_isError(n)) { |
| r = -ENOTRECOVERABLE; |
| goto cleanup; |
| } |
| |
| offset += n; |
| total_out += n; |
| r = loop_write(fdt, buf, offset, false); |
| if (r < 0) |
| goto cleanup; |
| |
| log_debug("LZ4 compression finished (%zu -> %zu bytes, %.1f%%)", |
| total_in, total_out, |
| (double) total_out / total_in * 100); |
| cleanup: |
| munmap(src, st.st_size); |
| return r; |
| #else |
| return -EPROTONOSUPPORT; |
| #endif |
| } |
| |
| int decompress_stream_xz(int fdf, int fdt, uint64_t max_bytes) { |
| |
| #if HAVE_XZ |
| _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_debug("Failed to initialize XZ decoder: code %u", ret); |
| return -ENOMEM; |
| } |
| |
| 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 (!IN_SET(ret, LZMA_OK, LZMA_STREAM_END)) { |
| log_debug("Decompression failed: code %u", 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 != (uint64_t) -1) { |
| if (max_bytes < (uint64_t) n) |
| return -EFBIG; |
| |
| max_bytes -= n; |
| } |
| |
| k = loop_write(fdt, out, n, false); |
| if (k < 0) |
| return k; |
| |
| if (ret == LZMA_STREAM_END) { |
| log_debug("XZ decompression finished (%"PRIu64" -> %"PRIu64" bytes, %.1f%%)", |
| s.total_in, s.total_out, |
| (double) s.total_out / s.total_in * 100); |
| |
| return 0; |
| } |
| } |
| } |
| #else |
| log_debug("Cannot decompress file. Compiled without XZ support."); |
| return -EPROTONOSUPPORT; |
| #endif |
| } |
| |
| int decompress_stream_lz4(int in, int out, uint64_t max_bytes) { |
| #if HAVE_LZ4 |
| size_t c; |
| _cleanup_(LZ4F_freeDecompressionContextp) LZ4F_decompressionContext_t ctx = NULL; |
| _cleanup_free_ char *buf = NULL; |
| char *src; |
| struct stat st; |
| int r = 0; |
| size_t total_in = 0, total_out = 0; |
| |
| c = LZ4F_createDecompressionContext(&ctx, LZ4F_VERSION); |
| if (LZ4F_isError(c)) |
| return -ENOMEM; |
| |
| if (fstat(in, &st) < 0) |
| return log_debug_errno(errno, "fstat() failed: %m"); |
| |
| buf = malloc(LZ4_BUFSIZE); |
| if (!buf) |
| return -ENOMEM; |
| |
| src = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, in, 0); |
| if (src == MAP_FAILED) |
| return -errno; |
| |
| while (total_in < (size_t) st.st_size) { |
| size_t produced = LZ4_BUFSIZE; |
| size_t used = st.st_size - total_in; |
| |
| c = LZ4F_decompress(ctx, buf, &produced, src + total_in, &used, NULL); |
| if (LZ4F_isError(c)) { |
| r = -EBADMSG; |
| goto cleanup; |
| } |
| |
| total_in += used; |
| total_out += produced; |
| |
| if (max_bytes != (uint64_t) -1 && total_out > (size_t) max_bytes) { |
| log_debug("Decompressed stream longer than %"PRIu64" bytes", max_bytes); |
| r = -EFBIG; |
| goto cleanup; |
| } |
| |
| r = loop_write(out, buf, produced, false); |
| if (r < 0) |
| goto cleanup; |
| } |
| |
| log_debug("LZ4 decompression finished (%zu -> %zu bytes, %.1f%%)", |
| total_in, total_out, |
| total_in > 0 ? (double) total_out / total_in * 100 : 0.0); |
| cleanup: |
| munmap(src, st.st_size); |
| return r; |
| #else |
| log_debug("Cannot decompress file. Compiled without LZ4 support."); |
| return -EPROTONOSUPPORT; |
| #endif |
| } |
| |
| int decompress_stream(const char *filename, int fdf, int fdt, uint64_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; |
| } |