#include <assert.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.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",

};

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;

assert(src);

assert(src_size > 0);

assert(dst);

assert(dst_size);

/* Returns < 0 if we couldn't compress the data or the

ret = lzma_easy_buffer_encode(LZMA_PRESET_DEFAULT, LZMA_CHECK_NONE, NULL,

src, src_size, dst, &out_pos, src_size - 1);

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, 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

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;

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 ?: (uint64_t) -1);

if (!greedy_realloc(dst, dst_alloc_size, space, 1))

return false;

s.next_in = src;

s.avail_in = src_size;

s.next_out = *dst;

s.avail_out = space;

for (;;) {

uint64_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 ?: (uint64_t) -1);

if (!greedy_realloc(dst, dst_alloc_size, space, 1))

return false;

s.avail_out = space - used;

s.next_out = *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, 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 decompressed blob starts with the

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 (ret != LZMA_STREAM_END && ret != LZMA_OK)

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 = *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

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 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;

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("XZ compression finished (%zu -> %zu bytes, %.1f%%)",

s.total_in, s.total_out,

(double) s.total_out / s.total_in * 100);

return 0;

}

}

}

}

#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;

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 -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 (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 -EFBIG;

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("XZ decompression finished (%zu -> %zu bytes, %.1f%%)",

s.total_in, s.total_out,

(double) s.total_out / s.total_in * 100);

return 0;

}

}

}

#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

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;

}