+
+/*
+ * Compression functions only used if we have zlib
+ */
+#ifdef HAVE_ZLIB
+
+void cdb_decompress_if_necessary(struct cdbdata *cdb) {
+ static int magic = COMPRESS_MAGIC;
+ struct CtdlCompressHeader zheader;
+ char *uncompressed_data;
+ char *compressed_data;
+ uLongf destLen, sourceLen;
+
+ if (cdb == NULL) return;
+ if (cdb->ptr == NULL) return;
+ if (memcmp(cdb->ptr, &magic, sizeof(magic))) return;
+
+ /* At this point we know we're looking at a compressed item. */
+ memcpy(&zheader, cdb->ptr, sizeof(struct CtdlCompressHeader));
+
+ compressed_data = cdb->ptr;
+ compressed_data += sizeof(struct CtdlCompressHeader);
+
+ sourceLen = (uLongf) zheader.compressed_len;
+ destLen = (uLongf) zheader.uncompressed_len;
+ uncompressed_data = mallok(zheader.uncompressed_len);
+
+ if (uncompress( (Bytef *) uncompressed_data,
+ &destLen,
+ compressed_data,
+ sourceLen
+ ) != Z_OK) {
+ lprintf(1, "uncompress() error\n");
+ abort();
+ }
+
+ phree(cdb->ptr);
+ cdb->len = (size_t) destLen;
+ cdb->ptr = uncompressed_data;
+}
+
+#endif /* HAVE_ZLIB */
+
+