fs/squashfs/sqfs_decompressor.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2020 Bootlin
   4  *
   5  * Author: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
   6  */
   7
   8 #include <errno.h>
   9 #include <stdint.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #if IS_ENABLED(CONFIG_ZLIB)
  13 #include <u-boot/zlib.h>
  14 #endif
  15
  16 #include "sqfs_decompressor.h"
  17 #include "sqfs_filesystem.h"
  18 #include "sqfs_utils.h"
  19
  20 #if IS_ENABLED(CONFIG_ZLIB)
  21 static void zlib_decompression_status(int ret)
  22 {
  23         switch (ret) {
  24         case Z_BUF_ERROR:
  25                 printf("Error: 'dest' buffer is not large enough.\n");
  26                 break;
  27         case Z_DATA_ERROR:
  28                 printf("Error: corrupted compressed data.\n");
  29                 break;
  30         case Z_MEM_ERROR:
  31                 printf("Error: insufficient memory.\n");
  32                 break;
  33         }
  34 }
  35 #endif
  36
  37 int sqfs_decompress(u16 comp_type, void *dest, unsigned long *dest_len,
  38                     void *source, u32 lenp)
  39 {
  40         int ret = 0;
  41
  42         switch (comp_type) {
  43 #if IS_ENABLED(CONFIG_ZLIB)
  44         case SQFS_COMP_ZLIB:
  45                 ret = uncompress(dest, dest_len, source, lenp);
  46                 if (ret) {
  47                         zlib_decompression_status(ret);
  48                         return -EINVAL;
  49                 }
  50
  51                 break;
  52 #endif
  53         default:
  54                 printf("Error: unknown compression type.\n");
  55                 return -EINVAL;
  56         }
  57
  58         return ret;
  59 }