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-rw-r--r--xlators/features/compress/src/cdc.h107
1 files changed, 107 insertions, 0 deletions
diff --git a/xlators/features/compress/src/cdc.h b/xlators/features/compress/src/cdc.h
new file mode 100644
index 0000000..71f4d23
--- /dev/null
+++ b/xlators/features/compress/src/cdc.h
@@ -0,0 +1,107 @@
+/*
+ Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+ This file is part of GlusterFS.
+
+ This file is licensed to you under your choice of the GNU Lesser
+ General Public License, version 3 or any later version (LGPLv3 or
+ later), or the GNU General Public License, version 2 (GPLv2), in all
+ cases as published by the Free Software Foundation.
+*/
+
+#ifndef __CDC_H
+#define __CDC_H
+
+#ifdef HAVE_LIB_Z
+#include "zlib.h"
+#endif
+
+#include "xlator.h"
+
+#ifndef MAX_IOVEC
+#define MAX_IOVEC 16
+#endif
+
+typedef struct cdc_priv {
+ int window_size;
+ int mem_level;
+ int cdc_level;
+ int min_file_size;
+ int op_mode;
+ gf_boolean_t debug;
+ gf_lock_t lock;
+} cdc_priv_t;
+
+typedef struct cdc_info {
+ /* input bits */
+ int count;
+ int32_t ibytes;
+ struct iovec *vector;
+ struct iatt *buf;
+
+ /* output bits */
+ int ncount;
+ int nbytes;
+ int buffer_size;
+ struct iovec vec[MAX_IOVEC];
+ struct iobref *iobref;
+
+ /* zlib bits */
+#ifdef HAVE_LIB_Z
+ z_stream stream;
+#endif
+ unsigned long crc;
+} cdc_info_t;
+
+#define NVEC(ci) (ci->ncount - 1)
+#define CURR_VEC(ci) ci->vec[ci->ncount - 1]
+#define THIS_VEC(ci, i) ci->vector[i]
+
+/* Gzip defaults */
+#define GF_CDC_DEF_WINDOWSIZE -15 /* default value */
+#define GF_CDC_MAX_WINDOWSIZE -8 /* max value */
+
+#ifdef HAVE_LIB_Z
+#define GF_CDC_DEF_COMPRESSION Z_DEFAULT_COMPRESSION
+#else
+#define GF_CDC_DEF_COMPRESSION -1
+#endif
+
+#define GF_CDC_DEF_MEMLEVEL 8
+#define GF_CDC_DEF_BUFFERSIZE 262144 // 256K - default compression buffer size
+
+/* Operation mode
+ * If xlator is loaded on client, readv decompresses and writev compresses
+ * If xlator is loaded on server, readv compresses and writev decompresses
+ */
+#define GF_CDC_MODE_CLIENT 0
+#define GF_CDC_MODE_SERVER 1
+
+/* min size of data to do cmpression
+ * 0 == compress even 1byte
+ */
+#define GF_CDC_MIN_CHUNK_SIZE 0
+
+#define GF_CDC_VALIDATION_SIZE 8
+
+#define GF_CDC_OS_ID 0xFF
+#define GF_CDC_DEFLATE_CANARY_VAL "deflate"
+#define GF_CDC_DEBUG_DUMP_FILE "/tmp/cdcdump.gz"
+
+#define GF_CDC_MODE_IS_CLIENT(m) \
+ (strcmp (m, "client") == 0)
+
+#define GF_CDC_MODE_IS_SERVER(m) \
+ (strcmp (m, "server") == 0)
+
+int32_t
+cdc_compress (xlator_t *this,
+ cdc_priv_t *priv,
+ cdc_info_t *ci,
+ dict_t **xdata);
+int32_t
+cdc_decompress (xlator_t *this,
+ cdc_priv_t *priv,
+ cdc_info_t *ci,
+ dict_t *xdata);
+
+#endif