lib/gzip.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2012
   4  * Lei Wen <leiwen@marvell.com>, Marvell Inc.
   5  */
   6
   7 #include <common.h>
   8 #include <watchdog.h>
   9 #include <command.h>
  10 #include <gzip.h>
  11 #include <image.h>
  12 #include <malloc.h>
  13 #include <memalign.h>
  14 #include <u-boot/zlib.h>
  15 #include "zlib/zutil.h"
  16
  17 #ifndef CONFIG_GZIP_COMPRESS_DEF_SZ
  18 #define CONFIG_GZIP_COMPRESS_DEF_SZ     0x200
  19 #endif
  20 #define ZALLOC_ALIGNMENT                16
  21
  22 static void *zalloc(void *x, unsigned items, unsigned size)
  23 {
  24         void *p;
  25
  26         size *= items;
  27         size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
  28
  29         p = malloc_cache_aligned(size);
  30
  31         return (p);
  32 }
  33
  34 static void zfree(void *x, void *addr, unsigned nb)
  35 {
  36         free (addr);
  37 }
  38
  39 int gzip(void *dst, unsigned long *lenp,
  40                 unsigned char *src, unsigned long srclen)
  41 {
  42         return zzip(dst, lenp, src, srclen, 1, NULL);
  43 }
  44
  45 /*
  46  * Compress blocks with zlib
  47  */
  48 int zzip(void *dst, unsigned long *lenp, unsigned char *src,
  49                 unsigned long srclen, int stoponerr,
  50                 int (*func)(unsigned long, unsigned long))
  51 {
  52         z_stream s;
  53         int r, flush, orig, window;
  54         unsigned long comp_len, left_len;
  55
  56         if (!srclen)
  57                 return 0;
  58
  59 #ifndef CONFIG_GZIP
  60         window = MAX_WBITS;
  61 #else
  62         window = 2 * MAX_WBITS;
  63 #endif
  64         orig = *lenp;
  65         s.zalloc = zalloc;
  66         s.zfree = zfree;
  67         s.opaque = Z_NULL;
  68
  69         r = deflateInit2_(&s, Z_BEST_SPEED, Z_DEFLATED, window,
  70                         DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
  71                         ZLIB_VERSION, sizeof(z_stream));
  72         if (r != Z_OK) {
  73                 printf ("Error: deflateInit2_() returned %d\n", r);
  74                 return -1;
  75         }
  76
  77         while (srclen > 0) {
  78                 comp_len = (srclen > CONFIG_GZIP_COMPRESS_DEF_SZ) ?
  79                                 CONFIG_GZIP_COMPRESS_DEF_SZ : srclen;
  80
  81                 s.next_in = src;
  82                 s.avail_in = comp_len;
  83                 flush = (srclen > CONFIG_GZIP_COMPRESS_DEF_SZ)?
  84                         Z_NO_FLUSH : Z_FINISH;
  85
  86                 do {
  87                         left_len = (*lenp > CONFIG_GZIP_COMPRESS_DEF_SZ) ?
  88                                         CONFIG_GZIP_COMPRESS_DEF_SZ : *lenp;
  89                         s.next_out = dst;
  90                         s.avail_out = left_len;
  91                         r = deflate(&s, flush);
  92                         if (r == Z_STREAM_ERROR && stoponerr == 1) {
  93                                 printf("Error: deflate() returned %d\n", r);
  94                                 r = -1;
  95                                 goto bail;
  96                         }
  97                         if (!func) {
  98                                 dst += (left_len - s.avail_out);
  99                                 *lenp -= (left_len - s.avail_out);
 100                         } else if (left_len - s.avail_out > 0) {
 101                                 r = func((unsigned long)dst,
 102                                         left_len - s.avail_out);
 103                                 if (r < 0)
 104                                         goto bail;
 105                         }
 106                 } while (s.avail_out == 0 && (*lenp > 0));
 107                 if (s.avail_in) {
 108                         printf("Deflate failed to consume %u bytes", s.avail_in);
 109                         r = -1;
 110                         goto bail;
 111                 }
 112                 if (*lenp == 0) {
 113                         printf("Deflate need more space to compress "
 114                                 "left %lu bytes\n", srclen);
 115                         r = -1;
 116                         goto bail;
 117                 }
 118                 srclen -= comp_len;
 119                 src += comp_len;
 120         }
 121
 122         r = 0;
 123 bail:
 124         deflateEnd(&s);
 125         *lenp = orig - *lenp;
 126         return r;
 127 }