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import-compress.c
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479 lines (346 loc) · 13.8 KB
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "import-compress.h"
#include "string-table.h"
#include "util.h"
void import_compress_free(ImportCompress *c) {
assert(c);
if (c->type == IMPORT_COMPRESS_XZ)
lzma_end(&c->xz);
else if (c->type == IMPORT_COMPRESS_GZIP) {
if (c->encoding)
deflateEnd(&c->gzip);
else
inflateEnd(&c->gzip);
#if HAVE_BZIP2
} else if (c->type == IMPORT_COMPRESS_BZIP2) {
if (c->encoding)
BZ2_bzCompressEnd(&c->bzip2);
else
BZ2_bzDecompressEnd(&c->bzip2);
#endif
}
c->type = IMPORT_COMPRESS_UNKNOWN;
}
int import_uncompress_detect(ImportCompress *c, const void *data, 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 bzip2_signature[] = {
'B', 'Z', 'h'
};
int r;
assert(c);
if (c->type != IMPORT_COMPRESS_UNKNOWN)
return 1;
if (size < MAX3(sizeof(xz_signature),
sizeof(gzip_signature),
sizeof(bzip2_signature)))
return 0;
assert(data);
if (memcmp(data, xz_signature, sizeof(xz_signature)) == 0) {
lzma_ret xzr;
xzr = lzma_stream_decoder(&c->xz, UINT64_MAX, LZMA_TELL_UNSUPPORTED_CHECK | LZMA_CONCATENATED);
if (xzr != LZMA_OK)
return -EIO;
c->type = IMPORT_COMPRESS_XZ;
} else if (memcmp(data, gzip_signature, sizeof(gzip_signature)) == 0) {
r = inflateInit2(&c->gzip, 15+16);
if (r != Z_OK)
return -EIO;
c->type = IMPORT_COMPRESS_GZIP;
#if HAVE_BZIP2
} else if (memcmp(data, bzip2_signature, sizeof(bzip2_signature)) == 0) {
r = BZ2_bzDecompressInit(&c->bzip2, 0, 0);
if (r != BZ_OK)
return -EIO;
c->type = IMPORT_COMPRESS_BZIP2;
#endif
} else
c->type = IMPORT_COMPRESS_UNCOMPRESSED;
c->encoding = false;
return 1;
}
void import_uncompress_force_off(ImportCompress *c) {
assert(c);
c->type = IMPORT_COMPRESS_UNCOMPRESSED;
c->encoding = false;
}
int import_uncompress(ImportCompress *c, const void *data, size_t size, ImportCompressCallback callback, void *userdata) {
int r;
assert(c);
assert(callback);
r = import_uncompress_detect(c, data, size);
if (r <= 0)
return r;
if (c->encoding)
return -EINVAL;
if (size <= 0)
return 1;
assert(data);
switch (c->type) {
case IMPORT_COMPRESS_UNCOMPRESSED:
r = callback(data, size, userdata);
if (r < 0)
return r;
break;
case IMPORT_COMPRESS_XZ:
c->xz.next_in = data;
c->xz.avail_in = size;
while (c->xz.avail_in > 0) {
uint8_t buffer[16 * 1024];
lzma_ret lzr;
c->xz.next_out = buffer;
c->xz.avail_out = sizeof(buffer);
lzr = lzma_code(&c->xz, LZMA_RUN);
if (!IN_SET(lzr, LZMA_OK, LZMA_STREAM_END))
return -EIO;
if (c->xz.avail_out < sizeof(buffer)) {
r = callback(buffer, sizeof(buffer) - c->xz.avail_out, userdata);
if (r < 0)
return r;
}
}
break;
case IMPORT_COMPRESS_GZIP:
c->gzip.next_in = (void*) data;
c->gzip.avail_in = size;
while (c->gzip.avail_in > 0) {
uint8_t buffer[16 * 1024];
c->gzip.next_out = buffer;
c->gzip.avail_out = sizeof(buffer);
r = inflate(&c->gzip, Z_NO_FLUSH);
if (!IN_SET(r, Z_OK, Z_STREAM_END))
return -EIO;
if (c->gzip.avail_out < sizeof(buffer)) {
r = callback(buffer, sizeof(buffer) - c->gzip.avail_out, userdata);
if (r < 0)
return r;
}
}
break;
#if HAVE_BZIP2
case IMPORT_COMPRESS_BZIP2:
c->bzip2.next_in = (void*) data;
c->bzip2.avail_in = size;
while (c->bzip2.avail_in > 0) {
uint8_t buffer[16 * 1024];
c->bzip2.next_out = (char*) buffer;
c->bzip2.avail_out = sizeof(buffer);
r = BZ2_bzDecompress(&c->bzip2);
if (!IN_SET(r, BZ_OK, BZ_STREAM_END))
return -EIO;
if (c->bzip2.avail_out < sizeof(buffer)) {
r = callback(buffer, sizeof(buffer) - c->bzip2.avail_out, userdata);
if (r < 0)
return r;
}
}
break;
#endif
default:
assert_not_reached();
}
return 1;
}
int import_compress_init(ImportCompress *c, ImportCompressType t) {
int r;
assert(c);
switch (t) {
case IMPORT_COMPRESS_XZ: {
lzma_ret xzr;
xzr = lzma_easy_encoder(&c->xz, LZMA_PRESET_DEFAULT, LZMA_CHECK_CRC64);
if (xzr != LZMA_OK)
return -EIO;
c->type = IMPORT_COMPRESS_XZ;
break;
}
case IMPORT_COMPRESS_GZIP:
r = deflateInit2(&c->gzip, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 15 + 16, 8, Z_DEFAULT_STRATEGY);
if (r != Z_OK)
return -EIO;
c->type = IMPORT_COMPRESS_GZIP;
break;
#if HAVE_BZIP2
case IMPORT_COMPRESS_BZIP2:
r = BZ2_bzCompressInit(&c->bzip2, 9, 0, 0);
if (r != BZ_OK)
return -EIO;
c->type = IMPORT_COMPRESS_BZIP2;
break;
#endif
case IMPORT_COMPRESS_UNCOMPRESSED:
c->type = IMPORT_COMPRESS_UNCOMPRESSED;
break;
default:
return -EOPNOTSUPP;
}
c->encoding = true;
return 0;
}
static int enlarge_buffer(void **buffer, size_t *buffer_size, size_t *buffer_allocated) {
size_t l;
void *p;
if (*buffer_allocated > *buffer_size)
return 0;
l = MAX(16*1024U, (*buffer_size * 2));
p = realloc(*buffer, l);
if (!p)
return -ENOMEM;
*buffer = p;
*buffer_allocated = l;
return 1;
}
int import_compress(ImportCompress *c, const void *data, size_t size, void **buffer, size_t *buffer_size, size_t *buffer_allocated) {
int r;
assert(c);
assert(buffer);
assert(buffer_size);
assert(buffer_allocated);
if (!c->encoding)
return -EINVAL;
if (size <= 0)
return 0;
assert(data);
*buffer_size = 0;
switch (c->type) {
case IMPORT_COMPRESS_XZ:
c->xz.next_in = data;
c->xz.avail_in = size;
while (c->xz.avail_in > 0) {
lzma_ret lzr;
r = enlarge_buffer(buffer, buffer_size, buffer_allocated);
if (r < 0)
return r;
c->xz.next_out = (uint8_t*) *buffer + *buffer_size;
c->xz.avail_out = *buffer_allocated - *buffer_size;
lzr = lzma_code(&c->xz, LZMA_RUN);
if (lzr != LZMA_OK)
return -EIO;
*buffer_size += (*buffer_allocated - *buffer_size) - c->xz.avail_out;
}
break;
case IMPORT_COMPRESS_GZIP:
c->gzip.next_in = (void*) data;
c->gzip.avail_in = size;
while (c->gzip.avail_in > 0) {
r = enlarge_buffer(buffer, buffer_size, buffer_allocated);
if (r < 0)
return r;
c->gzip.next_out = (uint8_t*) *buffer + *buffer_size;
c->gzip.avail_out = *buffer_allocated - *buffer_size;
r = deflate(&c->gzip, Z_NO_FLUSH);
if (r != Z_OK)
return -EIO;
*buffer_size += (*buffer_allocated - *buffer_size) - c->gzip.avail_out;
}
break;
#if HAVE_BZIP2
case IMPORT_COMPRESS_BZIP2:
c->bzip2.next_in = (void*) data;
c->bzip2.avail_in = size;
while (c->bzip2.avail_in > 0) {
r = enlarge_buffer(buffer, buffer_size, buffer_allocated);
if (r < 0)
return r;
c->bzip2.next_out = (void*) ((uint8_t*) *buffer + *buffer_size);
c->bzip2.avail_out = *buffer_allocated - *buffer_size;
r = BZ2_bzCompress(&c->bzip2, BZ_RUN);
if (r != BZ_RUN_OK)
return -EIO;
*buffer_size += (*buffer_allocated - *buffer_size) - c->bzip2.avail_out;
}
break;
#endif
case IMPORT_COMPRESS_UNCOMPRESSED:
if (*buffer_allocated < size) {
void *p;
p = realloc(*buffer, size);
if (!p)
return -ENOMEM;
*buffer = p;
*buffer_allocated = size;
}
memcpy(*buffer, data, size);
*buffer_size = size;
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
int import_compress_finish(ImportCompress *c, void **buffer, size_t *buffer_size, size_t *buffer_allocated) {
int r;
assert(c);
assert(buffer);
assert(buffer_size);
assert(buffer_allocated);
if (!c->encoding)
return -EINVAL;
*buffer_size = 0;
switch (c->type) {
case IMPORT_COMPRESS_XZ: {
lzma_ret lzr;
c->xz.avail_in = 0;
do {
r = enlarge_buffer(buffer, buffer_size, buffer_allocated);
if (r < 0)
return r;
c->xz.next_out = (uint8_t*) *buffer + *buffer_size;
c->xz.avail_out = *buffer_allocated - *buffer_size;
lzr = lzma_code(&c->xz, LZMA_FINISH);
if (!IN_SET(lzr, LZMA_OK, LZMA_STREAM_END))
return -EIO;
*buffer_size += (*buffer_allocated - *buffer_size) - c->xz.avail_out;
} while (lzr != LZMA_STREAM_END);
break;
}
case IMPORT_COMPRESS_GZIP:
c->gzip.avail_in = 0;
do {
r = enlarge_buffer(buffer, buffer_size, buffer_allocated);
if (r < 0)
return r;
c->gzip.next_out = (uint8_t*) *buffer + *buffer_size;
c->gzip.avail_out = *buffer_allocated - *buffer_size;
r = deflate(&c->gzip, Z_FINISH);
if (!IN_SET(r, Z_OK, Z_STREAM_END))
return -EIO;
*buffer_size += (*buffer_allocated - *buffer_size) - c->gzip.avail_out;
} while (r != Z_STREAM_END);
break;
#if HAVE_BZIP2
case IMPORT_COMPRESS_BZIP2:
c->bzip2.avail_in = 0;
do {
r = enlarge_buffer(buffer, buffer_size, buffer_allocated);
if (r < 0)
return r;
c->bzip2.next_out = (void*) ((uint8_t*) *buffer + *buffer_size);
c->bzip2.avail_out = *buffer_allocated - *buffer_size;
r = BZ2_bzCompress(&c->bzip2, BZ_FINISH);
if (!IN_SET(r, BZ_FINISH_OK, BZ_STREAM_END))
return -EIO;
*buffer_size += (*buffer_allocated - *buffer_size) - c->bzip2.avail_out;
} while (r != BZ_STREAM_END);
break;
#endif
case IMPORT_COMPRESS_UNCOMPRESSED:
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static const char* const import_compress_type_table[_IMPORT_COMPRESS_TYPE_MAX] = {
[IMPORT_COMPRESS_UNKNOWN] = "unknown",
[IMPORT_COMPRESS_UNCOMPRESSED] = "uncompressed",
[IMPORT_COMPRESS_XZ] = "xz",
[IMPORT_COMPRESS_GZIP] = "gzip",
#if HAVE_BZIP2
[IMPORT_COMPRESS_BZIP2] = "bzip2",
#endif
};
DEFINE_STRING_TABLE_LOOKUP(import_compress_type, ImportCompressType);