include/gzip.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * (C) Copyright 2000-2009
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 #ifndef __GZIP_H
   8 #define __GZIP_H
   9
  10 #include <linux/types.h>
  11
  12 struct blk_desc;
  13
  14 /**
  15  * gzip_parse_header() - Parse a header from a gzip file
  16  *
  17  * This returns the length of the header.
  18  *
  19  * @src: Pointer to gzip file
  20  * @len: Length of data
  21  * Return: length of header in bytes, or -1 if not enough data
  22  */
  23 int gzip_parse_header(const unsigned char *src, unsigned long len);
  24
  25 /**
  26  * gunzip() - Decompress gzipped data
  27  *
  28  * @dst: Destination for uncompressed data
  29  * @dstlen: Size of destination buffer
  30  * @src: Source data to decompress
  31  * @lenp: On entry, length of data at @src. On exit, number of bytes used from
  32  * @src
  33  * Return: 0 if OK, -1 on error
  34  */
  35 int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp);
  36
  37 /**
  38  * zunzip() - Uncompress blocks compressed with zlib without headers
  39  *
  40  * @dst: Destination for uncompressed data
  41  * @dstlen: Size of destination buffer
  42  * @src: Source data to decompress
  43  * @lenp: On entry, length of data at @src. On exit, number of bytes used from
  44  * @src
  45  * @stoponerr: 0 to continue when a decode error is found, 1 to stop
  46  * @offset: start offset within the src buffer
  47  * Return: 0 if OK, -1 on error
  48  */
  49 int zunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp,
  50            int stoponerr, int offset);
  51
  52 /**
  53  * gzwrite progress indicators: defined weak to allow board-specific
  54  * overrides:
  55  *
  56  *      gzwrite_progress_init called on startup
  57  *      gzwrite_progress called during decompress/write loop
  58  *      gzwrite_progress_finish called at end of loop to
  59  *              indicate success (retcode=0) or failure
  60  */
  61 void gzwrite_progress_init(ulong expected_size);
  62
  63 void gzwrite_progress(int iteration, ulong bytes_written, ulong total_bytes);
  64
  65 void gzwrite_progress_finish(int retcode, ulong totalwritten, ulong totalsize,
  66                              u32 expected_crc, u32 calculated_crc);
  67
  68 /**
  69  * gzwrite() - decompress and write gzipped image from memory to block device
  70  *
  71  * @src:        compressed image address
  72  * @len:        compressed image length in bytes
  73  * @dev:        block device descriptor
  74  * @szwritebuf: bytes per write (pad to erase size)
  75  * @startoffs:  offset in bytes of first write
  76  * @szexpected: expected uncompressed length, may be zero to use gzip trailer
  77  *              for files under 4GiB
  78  * Return: 0 if OK, -1 on error
  79  */
  80 int gzwrite(unsigned char *src, int len, struct blk_desc *dev, ulong szwritebuf,
  81             ulong startoffs, ulong szexpected);
  82
  83 /**
  84  * gzip()- Compress data into a buffer using the gzip algorithm
  85  *
  86  * @dst: Destination buffer for compressed data
  87  * @lenp: On entry, space available in destination buffer (in bytes). On exit,
  88  *      number of bytes used in the buffer
  89  * @src: Source data to compress
  90  * @srclen: Size of source data
  91  * Return: 0 if OK, -1 on error
  92  */
  93 int gzip(void *dst, unsigned long *lenp, unsigned char *src, ulong srclen);
  94
  95 /**
  96  * zzip() - Compress blocks with zlib
  97  *
  98  * @dst: Destination for compressed data
  99  * @lenp: On entry, length data at @dst. On exit, number of bytes written to
 100  *      @dst
 101  * @src: Source data to compress
 102  * @srclen: Size of source data
 103  * @stoponerr: 0 to continue when a decode error is found, 1 to stop
 104  * @func: Some sort of function that is called to do something. !ADD DOCS HERE!
 105  */
 106 int zzip(void *dst, ulong *lenp, unsigned char *src, ulong srclen,
 107          int stoponerr, int (*func)(ulong, ulong));
 108
 109 #endif