support dynamic stream compression

src/stream_compress.c

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2017, Intel Corporation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  * Neither the name of Intel Corporation nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "stream_compress.h"
+
+#include "state.h"
+#include "nfa/nfa_internal.h"
+#include "rose/rose_internal.h"
+#include "util/multibit.h"
+#include "util/uniform_ops.h"
+
+#include <string.h>
+
+#define COPY_IN(p, sz) do {                             \
+        assert(currOffset + sz <= buf_size);            \
+        memcpy(buf + currOffset, p, sz);                \
+        currOffset += sz;                               \
+        DEBUG_PRINTF("co = %zu\n", currOffset);         \
+    } while (0);
+
+#define COPY_OUT(p, sz) do {                            \
+        if (currOffset + sz > buf_size) {               \
+            return 0;                                   \
+        }                                               \
+        memcpy(p, buf + currOffset, sz);                \
+        currOffset += sz;                               \
+        DEBUG_PRINTF("co = %zu\n", currOffset);         \
+    } while (0);
+
+#define SIZE_COPY_IN(p, sz) do {                        \
+        currOffset += sz;                               \
+        DEBUG_PRINTF("co = %zu\n", currOffset);         \
+    } while (0);
+
+#define COPY COPY_OUT
+#define ASSIGN(lhs, rhs) do { lhs = rhs; } while (0)
+#define FN_SUFFIX expand
+#define STREAM_QUAL
+#define BUF_QUAL const
+#include "stream_compress_impl.h"
+
+int expand_stream(struct hs_stream *stream, const struct RoseEngine *rose,
+                  const char *buf, size_t buf_size) {
+    return sc_expand(rose, stream, buf, buf_size);
+}
+
+#define COPY COPY_IN
+#define ASSIGN(lhs, rhs) do { } while (0)
+#define FN_SUFFIX compress
+#define STREAM_QUAL const
+#define BUF_QUAL
+#include "stream_compress_impl.h"
+
+size_t compress_stream(char *buf, size_t buf_size,
+                       const struct RoseEngine *rose,
+                       const struct hs_stream *stream) {
+    return sc_compress(rose, stream, buf, buf_size);
+}
+
+#define COPY SIZE_COPY_IN
+#define ASSIGN(lhs, rhs) do { } while (0)
+#define FN_SUFFIX size
+#define STREAM_QUAL const
+#define BUF_QUAL UNUSED
+#include "stream_compress_impl.h"
+
+size_t size_compress_stream(const struct RoseEngine *rose,
+                            const struct hs_stream *stream) {
+    return sc_size(rose, stream, NULL, 0);
+}