/arch/xtensa/boot/lib/zmem.c

http://github.com/mirrors/linux · C · 80 lines · 60 code · 11 blank · 9 comment · 25 complexity · 2ef78ddd10ab543f6d79b0928354237e MD5 · raw file

  1. // SPDX-License-Identifier: GPL-2.0
  2. #include <linux/zlib.h>
  3. /* bits taken from ppc */
  4. extern void *avail_ram, *end_avail;
  5. void exit (void)
  6. {
  7. for (;;);
  8. }
  9. void *zalloc(unsigned size)
  10. {
  11. void *p = avail_ram;
  12. size = (size + 7) & -8;
  13. avail_ram += size;
  14. if (avail_ram > end_avail) {
  15. //puts("oops... out of memory\n");
  16. //pause();
  17. exit ();
  18. }
  19. return p;
  20. }
  21. #define HEAD_CRC 2
  22. #define EXTRA_FIELD 4
  23. #define ORIG_NAME 8
  24. #define COMMENT 0x10
  25. #define RESERVED 0xe0
  26. #define DEFLATED 8
  27. void gunzip (void *dst, int dstlen, unsigned char *src, int *lenp)
  28. {
  29. z_stream s;
  30. int r, i, flags;
  31. /* skip header */
  32. i = 10;
  33. flags = src[3];
  34. if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
  35. //puts("bad gzipped data\n");
  36. exit();
  37. }
  38. if ((flags & EXTRA_FIELD) != 0)
  39. i = 12 + src[10] + (src[11] << 8);
  40. if ((flags & ORIG_NAME) != 0)
  41. while (src[i++] != 0)
  42. ;
  43. if ((flags & COMMENT) != 0)
  44. while (src[i++] != 0)
  45. ;
  46. if ((flags & HEAD_CRC) != 0)
  47. i += 2;
  48. if (i >= *lenp) {
  49. //puts("gunzip: ran out of data in header\n");
  50. exit();
  51. }
  52. s.workspace = zalloc(zlib_inflate_workspacesize());
  53. r = zlib_inflateInit2(&s, -MAX_WBITS);
  54. if (r != Z_OK) {
  55. //puts("inflateInit2 returned "); puthex(r); puts("\n");
  56. exit();
  57. }
  58. s.next_in = src + i;
  59. s.avail_in = *lenp - i;
  60. s.next_out = dst;
  61. s.avail_out = dstlen;
  62. r = zlib_inflate(&s, Z_FINISH);
  63. if (r != Z_OK && r != Z_STREAM_END) {
  64. //puts("inflate returned "); puthex(r); puts("\n");
  65. exit();
  66. }
  67. *lenp = s.next_out - (unsigned char *) dst;
  68. zlib_inflateEnd(&s);
  69. }