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-rw-r--r--src/import/import-compress.c194
1 files changed, 194 insertions, 0 deletions
diff --git a/src/import/import-compress.c b/src/import/import-compress.c
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+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2015 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "util.h"
+#include "import-compress.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)
+ inflateEnd(&c->gzip);
+ else if (c->type == IMPORT_COMPRESS_BZIP2)
+ BZ2_bzDecompressEnd(&c->bzip2);
+
+ 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);
+ 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;
+
+ } 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;
+ } else
+ c->type = IMPORT_COMPRESS_UNCOMPRESSED;
+
+ return 1;
+}
+
+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 (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 (lzr != LZMA_OK && lzr != LZMA_STREAM_END)
+ return -EIO;
+
+ 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 (r != Z_OK && r != Z_STREAM_END)
+ return -EIO;
+
+ r = callback(buffer, sizeof(buffer) - c->gzip.avail_out, userdata);
+ if (r < 0)
+ return r;
+ }
+
+ break;
+
+ 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 (r != BZ_OK && r != BZ_STREAM_END)
+ return -EIO;
+
+ r = callback(buffer, sizeof(buffer) - c->bzip2.avail_out, userdata);
+ if (r < 0)
+ return r;
+ }
+
+ break;
+
+ default:
+ assert_not_reached("Unknown compression");
+ }
+
+ return 1;
+}
+
+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",
+ [IMPORT_COMPRESS_BZIP2] = "bzip2",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(import_compress_type, ImportCompressType);