1 files changed, 77 insertions, 0 deletions
diff --git a/src/libnetdata/gorilla/gorilla.h b/src/libnetdata/gorilla/gorilla.h
new file mode 100644
index 000000000..7975d85ee
--- /dev/null
+++ b/src/libnetdata/gorilla/gorilla.h
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef GORILLA_H
+#define GORILLA_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct gorilla_buffer;
+
+typedef struct {
+    struct gorilla_buffer *next;
+    uint32_t entries;
+    uint32_t nbits;
+} gorilla_header_t;
+
+typedef struct gorilla_buffer {
+    gorilla_header_t header;
+    uint32_t data[];
+} gorilla_buffer_t;
+
+typedef struct {
+    gorilla_buffer_t *head_buffer;
+    gorilla_buffer_t *last_buffer;
+
+    uint32_t prev_number;
+    uint32_t prev_xor_lzc;
+
+    // in bits
+    uint32_t capacity;
+} gorilla_writer_t;
+
+typedef struct {
+    const gorilla_buffer_t *buffer;
+
+    // number of values
+    size_t entries;
+    size_t index;
+
+    // in bits
+    size_t capacity; // FIXME: this not needed on the reader's side
+    size_t position;
+
+    uint32_t prev_number;
+    uint32_t prev_xor_lzc;
+    uint32_t prev_xor;
+} gorilla_reader_t;
+
+gorilla_writer_t gorilla_writer_init(gorilla_buffer_t *gbuf, size_t n);
+void gorilla_writer_add_buffer(gorilla_writer_t *gw, gorilla_buffer_t *gbuf, size_t n);
+bool gorilla_writer_write(gorilla_writer_t *gw, uint32_t number);
+uint32_t gorilla_writer_entries(const gorilla_writer_t *gw);
+
+gorilla_reader_t gorilla_writer_get_reader(const gorilla_writer_t *gw);
+
+gorilla_buffer_t *gorilla_writer_drop_head_buffer(gorilla_writer_t *gw);
+
+uint32_t gorilla_writer_nbytes(const gorilla_writer_t *gw);
+bool gorilla_writer_serialize(const gorilla_writer_t *gw, uint8_t *dst, uint32_t dst_size);
+
+uint32_t gorilla_buffer_patch(gorilla_buffer_t *buf);
+gorilla_reader_t gorilla_reader_init(gorilla_buffer_t *buf);
+bool gorilla_reader_read(gorilla_reader_t *gr, uint32_t *number);
+
+#define RRDENG_GORILLA_32BIT_BUFFER_SLOTS 128
+#define RRDENG_GORILLA_32BIT_BUFFER_SIZE (RRDENG_GORILLA_32BIT_BUFFER_SLOTS * sizeof(uint32_t))
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GORILLA_H */