common: Move gzip functions into a new gzip header

As part of the effort to remove things from common.h, create a new header
for the gzip functions. Move the function declarations to it and add
missing documentation.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>

include/gzip.h

@@ -0,0 +1,103 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2000-2009
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ */
+
+#ifndef __GZIP_H
+#define __GZIP_H
+
+/**
+ * gzip_parse_header() - Parse a header from a gzip file
+ *
+ * This returns the length of the header.
+ *
+ * @src: Pointer to gzip file
+ * @len: Length of data
+ * @return length of header in bytes, or -1 if not enough data
+ */
+int gzip_parse_header(const unsigned char *src, unsigned long len);
+
+/**
+ * gunzip() - Decompress gzipped data
+ *
+ * @dst: Destination for uncompressed data
+ * @dstlen: Size of destination buffer
+ * @src: Source data to decompress
+ * @lenp: Returns length of uncompressed data
+ * @return 0 if OK, -1 on error
+ */
+int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp);
+
+/**
+ * zunzip() - Uncompress blocks compressed with zlib without headers
+ *
+ * @dst: Destination for uncompressed data
+ * @dstlen: Size of destination buffer
+ * @src: Source data to decompress
+ * @lenp: On entry, length data at @src. On exit, number of bytes used from @src
+ * @stoponerr: 0 to continue when a decode error is found, 1 to stop
+ * @offset: start offset within the src buffer
+ * @return 0 if OK, -1 on error
+ */
+int zunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp,
+	   int stoponerr, int offset);
+
+/**
+ * gzwrite progress indicators: defined weak to allow board-specific
+ * overrides:
+ *
+ *	gzwrite_progress_init called on startup
+ *	gzwrite_progress called during decompress/write loop
+ *	gzwrite_progress_finish called at end of loop to
+ *		indicate success (retcode=0) or failure
+ */
+void gzwrite_progress_init(u64 expected_size);
+
+void gzwrite_progress(int iteration, u64 bytes_written, u64 total_bytes);
+
+void gzwrite_progress_finish(int retcode, u64 totalwritten, u64 totalsize,
+			     u32 expected_crc, u32 calculated_crc);
+
+/**
+ * gzwrite() - decompress and write gzipped image from memory to block device
+ *
+ * @src:	compressed image address
+ * @len:	compressed image length in bytes
+ * @dev:	block device descriptor
+ * @szwritebuf:	bytes per write (pad to erase size)
+ * @startoffs:	offset in bytes of first write
+ * @szexpected:	expected uncompressed length, may be zero to use gzip trailer
+ *		for files under 4GiB
+ * @return 0 if OK, -1 on error
+ */
+int gzwrite(unsigned char *src, int len, struct blk_desc *dev, ulong szwritebuf,
+	    u64 startoffs, u64 szexpected);
+
+/**
+ * gzip()- Compress data into a buffer using the gzip algorithm
+ *
+ * @dst: Destination buffer for compressed data
+ * @lenp: On entry, space available in destination buffer (in bytes). On exit,
+ *	number of bytes used in the buffer
+ * @src: Source data to compress
+ * @srclen: Size of source data
+ * @return 0 if OK, -1 on error
+ */
+int gzip(void *dst, unsigned long *lenp, unsigned char *src, ulong srclen);
+
+/**
+ * zzip() - Compress blocks with zlib
+ *
+ * @dst: Destination for compressed data
+ * @lenp: On entry, length data at @dst. On exit, number of bytes written to
+ *	@dst
+ * @src: Source data to compress
+ * @srclen: Size of source data
+ * @stoponerr: 0 to continue when a decode error is found, 1 to stop
+ * @func: Some sort of function that is called to do something. !ADD DOCS HERE!
+ */
+int zzip(void *dst, ulong *lenp, unsigned char *src, ulong srclen,
+	 int stoponerr, int (*func)(ulong, ulong));
+
+#endif