lib/gzip.c

   1 /*
   2  * (C) Copyright 2012
   3  * Lei Wen <leiwen@marvell.com>, Marvell Inc.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <watchdog.h>
  10 #include <command.h>
  11 #include <image.h>
  12 #include <malloc.h>
  13 #include <u-boot/zlib.h>
  14 #include "zlib/zutil.h"
  15
  16 #ifndef CONFIG_GZIP_COMPRESS_DEF_SZ
  17 #define CONFIG_GZIP_COMPRESS_DEF_SZ     0x200
  18 #endif
  19 #define ZALLOC_ALIGNMENT                16
  20
  21 static void *zalloc(void *x, unsigned items, unsigned size)
  22 {
  23         void *p;
  24
  25         size *= items;
  26         size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
  27
  28         p = malloc (size);
  29
  30         return (p);
  31 }
  32
  33 static void zfree(void *x, void *addr, unsigned nb)
  34 {
  35         free (addr);
  36 }
  37
  38 int gzip(void *dst, unsigned long *lenp,
  39                 unsigned char *src, unsigned long srclen)
  40 {
  41         return zzip(dst, lenp, src, srclen, 1, NULL);
  42 }
  43
  44 /*
  45  * Compress blocks with zlib
  46  */
  47 int zzip(void *dst, unsigned long *lenp, unsigned char *src,
  48                 unsigned long srclen, int stoponerr,
  49                 int (*func)(unsigned long, unsigned long))
  50 {
  51         z_stream s;
  52         int r, flush, orig, window;
  53         unsigned long comp_len, left_len;
  54
  55         if (!srclen)
  56                 return 0;
  57
  58 #ifndef CONFIG_GZIP
  59         window = MAX_WBITS;
  60 #else
  61         window = 2 * MAX_WBITS;
  62 #endif
  63         orig = *lenp;
  64         s.zalloc = zalloc;
  65         s.zfree = zfree;
  66         s.opaque = Z_NULL;
  67
  68         r = deflateInit2_(&s, Z_BEST_SPEED, Z_DEFLATED, window,
  69                         DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
  70                         ZLIB_VERSION, sizeof(z_stream));
  71         if (r != Z_OK) {
  72                 printf ("Error: deflateInit2_() returned %d\n", r);
  73                 return -1;
  74         }
  75
  76         while (srclen > 0) {
  77                 comp_len = (srclen > CONFIG_GZIP_COMPRESS_DEF_SZ) ?
  78                                 CONFIG_GZIP_COMPRESS_DEF_SZ : srclen;
  79
  80                 s.next_in = src;
  81                 s.avail_in = comp_len;
  82                 flush = (srclen > CONFIG_GZIP_COMPRESS_DEF_SZ)?
  83                         Z_NO_FLUSH : Z_FINISH;
  84
  85                 do {
  86                         left_len = (*lenp > CONFIG_GZIP_COMPRESS_DEF_SZ) ?
  87                                         CONFIG_GZIP_COMPRESS_DEF_SZ : *lenp;
  88                         s.next_out = dst;
  89                         s.avail_out = left_len;
  90                         r = deflate(&s, flush);
  91                         if (r == Z_STREAM_ERROR && stoponerr == 1) {
  92                                 printf("Error: deflate() returned %d\n", r);
  93                                 r = -1;
  94                                 goto bail;
  95                         }
  96                         if (!func) {
  97                                 dst += (left_len - s.avail_out);
  98                                 *lenp -= (left_len - s.avail_out);
  99                         } else if (left_len - s.avail_out > 0) {
 100                                 r = func((unsigned long)dst,
 101                                         left_len - s.avail_out);
 102                                 if (r < 0)
 103                                         goto bail;
 104                         }
 105                 } while (s.avail_out == 0 && (*lenp > 0));
 106                 if (s.avail_in) {
 107                         printf("Deflate failed to consume %u bytes", s.avail_in);
 108                         r = -1;
 109                         goto bail;
 110                 }
 111                 if (*lenp == 0) {
 112                         printf("Deflate need more space to compress "
 113                                 "left %lu bytes\n", srclen);
 114                         r = -1;
 115                         goto bail;
 116                 }
 117                 srclen -= comp_len;
 118                 src += comp_len;
 119         }
 120
 121         r = 0;
 122 bail:
 123         deflateEnd(&s);
 124         *lenp = orig - *lenp;
 125         return r;
 126 }