1 files changed, 68 insertions, 0 deletions
diff --git a/src/bin/pg_dump/compress_io.h b/src/bin/pg_dump/compress_io.h
new file mode 100644
index 00000000000..8edf2b1ea6d
--- /dev/null
+++ b/src/bin/pg_dump/compress_io.h
@@ -0,0 +1,68 @@
+/*-------------------------------------------------------------------------
+ *
+ * compress_io.h
+ *   Interface to compress_io.c routines
+ *
+ * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *     src/bin/pg_dump/compress_io.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef __COMPRESS_IO__
+#define __COMPRESS_IO__
+
+#include "postgres_fe.h"
+#include "pg_backup_archiver.h"
+
+/* Initial buffer sizes used in zlib compression. */
+#define ZLIB_OUT_SIZE	4096
+#define ZLIB_IN_SIZE	4096
+
+struct _CompressorState;
+
+typedef enum
+{
+	COMPR_ALG_NONE,
+	COMPR_ALG_LIBZ
+} CompressionAlgorithm;
+
+/* Prototype for callback function to WriteDataToArchive() */
+typedef size_t (*WriteFunc)(ArchiveHandle *AH, const char *buf, size_t len);
+
+/*
+ * Prototype for callback function to ReadDataFromArchive()
+ *
+ * ReadDataFromArchive will call the read function repeatedly, until it
+ * returns 0 to signal EOF. ReadDataFromArchive passes a buffer to read the
+ * data into in *buf, of length *buflen. If that's not big enough for the
+ * callback function, it can free() it and malloc() a new one, returning the
+ * new buffer and its size in *buf and *buflen.
+ *
+ * Returns the number of bytes read into *buf, or 0 on EOF.
+ */
+typedef size_t (*ReadFunc)(ArchiveHandle *AH, char **buf, size_t *buflen);
+
+typedef struct _CompressorState
+{
+	CompressionAlgorithm comprAlg;
+	WriteFunc			writeF;
+
+#ifdef HAVE_LIBZ
+	z_streamp			zp;
+	char			   *zlibOut;
+	size_t				zlibOutSize;
+#endif
+} CompressorState;
+
+extern CompressorState *AllocateCompressor(int compression, WriteFunc writeF);
+extern void ReadDataFromArchive(ArchiveHandle *AH, int compression,
+								ReadFunc readF);
+extern size_t WriteDataToArchive(ArchiveHandle *AH, CompressorState *cs,
+								 const void *data, size_t dLen);
+extern void EndCompressor(ArchiveHandle *AH, CompressorState *cs);
+
+#endif