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compressor.c
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/* SPDX-License-Identifier: LGPL-2.1+ */
#include "compressor.h"
#include "util.h"
/* #undef EIO */
/* #define EIO __LINE__ */
/* #undef EBADMSG */
/* #define EBADMSG __LINE__ */
int detect_compression(const void *buffer, size_t size) {
static const uint8_t xz_signature[] = {
0xfd, '7', 'z', 'X', 'Z', 0x00
};
static const uint8_t gzip_signature[] = {
0x1f, 0x8b
};
static const uint8_t zstd_signature[] = {
0x28, 0xb5, 0x2f, 0xfd
};
if (size >= sizeof(xz_signature) &&
memcmp(buffer, xz_signature, sizeof(xz_signature)) == 0)
return CA_COMPRESSION_XZ;
if (size >= sizeof(gzip_signature) &&
memcmp(buffer, gzip_signature, sizeof(gzip_signature)) == 0)
return CA_COMPRESSION_GZIP;
if (size >= sizeof(zstd_signature) &&
memcmp(buffer, zstd_signature, sizeof(zstd_signature)) == 0)
return CA_COMPRESSION_ZSTD;
if (size < MAX3(sizeof(xz_signature), sizeof(gzip_signature), sizeof(zstd_signature)))
return -EAGAIN; /* Not ready to decide yet */
return -EBADMSG;
}
bool compressor_is_supported(CaCompressionType compressor) {
switch (compressor) {
case CA_COMPRESSION_XZ:
return HAVE_LIBLZMA;
case CA_COMPRESSION_GZIP:
return HAVE_LIBZ;
case CA_COMPRESSION_ZSTD:
return HAVE_LIBZSTD;
default:
assert("Unknown compression type");
return false;
}
}
int compressor_start_decode(CompressorContext *c, CaCompressionType compressor) {
int r;
if (!c)
return -EINVAL;
if (compressor < 0)
return -EINVAL;
if (compressor >= _CA_COMPRESSION_TYPE_MAX)
return -EOPNOTSUPP;
switch (compressor) {
case CA_COMPRESSION_XZ: {
#if HAVE_LIBLZMA
lzma_ret xzr;
xzr = lzma_stream_decoder(&c->xz, UINT64_MAX, LZMA_TELL_UNSUPPORTED_CHECK);
if (xzr != LZMA_OK)
return -EIO;
break;
#else
return -ENOSYS;
#endif
}
case CA_COMPRESSION_GZIP:
#if HAVE_LIBZ
r = inflateInit2(&c->gzip, 15 | 16);
if (r != Z_OK)
return -EIO;
break;
#else
return -ENOSYS;
#endif
case CA_COMPRESSION_ZSTD:
#if HAVE_LIBZSTD
c->zstd.dstream = ZSTD_createDStream();
if (!c->zstd.dstream)
return -ENOMEM;
ZSTD_initDStream(c->zstd.dstream);
break;
#else
return -ENOSYS;
#endif
default:
assert_not_reached("Unknown decompressor.");
}
c->operation = COMPRESSOR_DECODE;
c->compressor = compressor;
return 0;
}
int compressor_start_encode(CompressorContext *c, CaCompressionType compressor) {
int r;
if (!c)
return -EINVAL;
if (compressor < 0)
return -EINVAL;
if (compressor >= _CA_COMPRESSION_TYPE_MAX)
return -EOPNOTSUPP;
switch (compressor) {
case CA_COMPRESSION_XZ: {
#if HAVE_LIBLZMA
lzma_ret xzr;
xzr = lzma_easy_encoder(&c->xz, LZMA_PRESET_DEFAULT, LZMA_CHECK_CRC64);
if (xzr != LZMA_OK)
return -EIO;
break;
#else
return -ENOSYS;
#endif
}
case CA_COMPRESSION_GZIP:
#if HAVE_LIBZ
r = deflateInit2(&c->gzip, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 15 | 16, 8, Z_DEFAULT_STRATEGY);
if (r != Z_OK)
return -EIO;
break;
#else
return -ENOSYS;
#endif
case CA_COMPRESSION_ZSTD:
#if HAVE_LIBZSTD
c->zstd.cstream = ZSTD_createCStream();
if (!c->zstd.cstream)
return -ENOMEM;
ZSTD_initCStream(c->zstd.cstream, 3);
break;
#else
return -ENOSYS;
#endif
default:
assert_not_reached("Unknown compressor.");
}
c->operation = COMPRESSOR_ENCODE;
c->compressor = compressor;
return 0;
}
void compressor_finish(CompressorContext *c) {
if (!c)
return;
if (c->operation == COMPRESSOR_UNINITIALIZED)
return;
switch (c->compressor) {
case CA_COMPRESSION_XZ:
#if HAVE_LIBLZMA
lzma_end(&c->xz);
#endif
break;
case CA_COMPRESSION_GZIP:
#if HAVE_LIBZ
if (c->operation == COMPRESSOR_DECODE)
inflateEnd(&c->gzip);
else if (c->operation == COMPRESSOR_ENCODE)
deflateEnd(&c->gzip);
else
assert_not_reached("Unknown operation.");
#endif
break;
case CA_COMPRESSION_ZSTD:
#if HAVE_LIBZSTD
if (c->operation == COMPRESSOR_ENCODE)
ZSTD_freeCStream(c->zstd.cstream);
else if (c->operation == COMPRESSOR_DECODE)
ZSTD_freeDStream(c->zstd.dstream);
else
assert_not_reached("Unknown operation.");
#endif
break;
default:
assert_not_reached("Unknown compressor.");
}
}
int compressor_input(CompressorContext *c, const void *p, size_t sz) {
if (!c)
return -EINVAL;
if (sz > 0 && !p)
return -EINVAL;
switch (c->compressor) {
case CA_COMPRESSION_XZ:
#if HAVE_LIBLZMA
c->xz.next_in = p;
c->xz.avail_in = sz;
break;
#else
return -ENOSYS;
#endif
case CA_COMPRESSION_GZIP:
#if HAVE_LIBZ
c->gzip.next_in = (void*) p;
c->gzip.avail_in = sz;
break;
#else
return -ENOSYS;
#endif
case CA_COMPRESSION_ZSTD:
#if HAVE_LIBZSTD
c->zstd.input = (ZSTD_inBuffer) {
.src = p,
.size = sz,
};
break;
#else
return -ENOSYS;
#endif
default:
assert_not_reached("Unknown compressor.");
}
return 0;
}
int compressor_decode(CompressorContext *c, void *p, size_t sz, size_t *ret_done) {
int r;
if (!c)
return -EINVAL;
if (sz > 0 && !p)
return -EINVAL;
if (!ret_done)
return -EINVAL;
if (c->operation != COMPRESSOR_DECODE)
return -ENOTTY;
switch (c->compressor) {
case CA_COMPRESSION_XZ: {
#if HAVE_LIBLZMA
lzma_ret xzr;
c->xz.next_out = p;
c->xz.avail_out = sz;
assert(c->xz.avail_out > 0);
assert(c->xz.avail_in > 0);
xzr = lzma_code(&c->xz, LZMA_RUN);
if (xzr == LZMA_STREAM_END) {
if (c->xz.avail_in > 0)
return -EBADMSG;
*ret_done = sz - c->xz.avail_out;
return COMPRESSOR_EOF;
} else if (xzr != LZMA_OK)
return -EIO;
*ret_done = sz - c->xz.avail_out;
if (c->xz.avail_in > 0)
return COMPRESSOR_MORE;
return COMPRESSOR_GOOD;
#else
return -ENOSYS;
#endif
}
case CA_COMPRESSION_GZIP:
#if HAVE_LIBZ
c->gzip.next_out = p;
c->gzip.avail_out = sz;
assert(c->gzip.avail_out > 0);
assert(c->gzip.avail_in > 0);
r = inflate(&c->gzip, Z_NO_FLUSH);
if (r == Z_STREAM_END) {
if (c->gzip.avail_in > 0)
return -EBADMSG;
*ret_done = sz - c->gzip.avail_out;
return COMPRESSOR_EOF;
} else if (r != Z_OK)
return -EIO;
*ret_done = sz - c->gzip.avail_out;
if (c->gzip.avail_in > 0)
return COMPRESSOR_MORE;
return COMPRESSOR_GOOD;
#else
return -ENOSYS;
#endif
case CA_COMPRESSION_ZSTD: {
#if HAVE_LIBZSTD
size_t k;
c->zstd.output = (ZSTD_outBuffer) {
.dst = p,
.size = sz,
};
assert(c->zstd.output.size > c->zstd.output.pos);
assert(c->zstd.input.size > c->zstd.input.pos);
k = ZSTD_decompressStream(c->zstd.dstream, &c->zstd.output, &c->zstd.input);
if (ZSTD_isError(k))
return -EIO;
if (k == 0) {
if (c->zstd.input.size > c->zstd.input.pos)
return -EBADMSG;
r = COMPRESSOR_EOF;
} else if (c->zstd.input.pos < c->zstd.input.size)
r = COMPRESSOR_MORE;
else
r = COMPRESSOR_GOOD;
*ret_done = c->zstd.output.pos;
return r;
#else
return -ENOSYS;
#endif
}
default:
assert_not_reached("Unknown compressor.");
}
}
int compressor_encode(CompressorContext *c, bool finalize, void *p, size_t sz, size_t *ret_done) {
_unused_ int r;
if (!c)
return -EINVAL;
if (sz > 0 && !p)
return -EINVAL;
if (!ret_done)
return -EINVAL;
if (c->operation != COMPRESSOR_ENCODE)
return -ENOTTY;
switch (c->compressor) {
case CA_COMPRESSION_XZ: {
#if HAVE_LIBLZMA
lzma_ret xzr;
c->xz.next_out = p;
c->xz.avail_out = sz;
xzr = lzma_code(&c->xz, finalize ? LZMA_FINISH : LZMA_RUN);
if (xzr == LZMA_STREAM_END) {
assert(c->xz.avail_in == 0);
*ret_done = sz - c->xz.avail_out;
return COMPRESSOR_EOF;
} else if (xzr != LZMA_OK)
return -EIO;
*ret_done = sz - c->xz.avail_out;
if (c->xz.avail_in > 0)
return COMPRESSOR_MORE;
return COMPRESSOR_GOOD;
#else
return -ENOSYS;
#endif
}
case CA_COMPRESSION_GZIP:
#if HAVE_LIBZ
c->gzip.next_out = p;
c->gzip.avail_out = sz;
r = deflate(&c->gzip, finalize ? Z_FINISH : Z_NO_FLUSH);
if (r == Z_STREAM_END) {
assert(c->gzip.avail_in == 0);
*ret_done = sz - c->gzip.avail_out;
return COMPRESSOR_EOF;
} else if (r != Z_OK)
return -EIO;
*ret_done = sz - c->gzip.avail_out;
if (c->gzip.avail_in > 0)
return COMPRESSOR_MORE;
return COMPRESSOR_GOOD;
#else
return -ENOSYS;
#endif
case CA_COMPRESSION_ZSTD: {
#if HAVE_LIBZSTD
size_t k;
c->zstd.output = (ZSTD_outBuffer) {
.dst = p,
.size = sz,
};
assert(c->zstd.output.size > c->zstd.output.pos);
if (c->zstd.input.size > c->zstd.input.pos)
k = ZSTD_compressStream(c->zstd.cstream, &c->zstd.output, &c->zstd.input);
else {
assert(finalize);
k = ZSTD_endStream(c->zstd.cstream, &c->zstd.output);
}
if (ZSTD_isError(k))
return -EIO;
*ret_done = c->zstd.output.pos;
if (c->zstd.input.pos < c->zstd.input.size)
return COMPRESSOR_MORE;
if (k == 0)
return COMPRESSOR_EOF;
return COMPRESSOR_GOOD;
#else
return -ENOSYS;
#endif
}
default:
assert_not_reached("Unknown compressor.");
}
}