1 files changed, 45 insertions, 0 deletions
diff --git a/src/include/common/compression.h b/src/include/common/compression.h
new file mode 100644
index 0000000..bb80e88
--- /dev/null
+++ b/src/include/common/compression.h
@@ -0,0 +1,45 @@
+/*-------------------------------------------------------------------------
+ *
+ * compression.h
+ *
+ * Shared definitions for compression methods and specifications.
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *		  src/common/compression.h
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef PG_COMPRESSION_H
+#define PG_COMPRESSION_H
+
+typedef enum pg_compress_algorithm
+{
+	PG_COMPRESSION_NONE,
+	PG_COMPRESSION_GZIP,
+	PG_COMPRESSION_LZ4,
+	PG_COMPRESSION_ZSTD
+} pg_compress_algorithm;
+
+#define PG_COMPRESSION_OPTION_WORKERS		(1 << 0)
+
+typedef struct pg_compress_specification
+{
+	pg_compress_algorithm algorithm;
+	unsigned	options;		/* OR of PG_COMPRESSION_OPTION constants */
+	int			level;
+	int			workers;
+	char	   *parse_error;	/* NULL if parsing was OK, else message */
+} pg_compress_specification;
+
+extern bool parse_compress_algorithm(char *name, pg_compress_algorithm *algorithm);
+extern const char *get_compress_algorithm_name(pg_compress_algorithm algorithm);
+
+extern void parse_compress_specification(pg_compress_algorithm algorithm,
+										 char *specification,
+										 pg_compress_specification *result);
+
+extern char *validate_compress_specification(pg_compress_specification *);
+
+#endif