sparse_format.h 1.8 KB

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  1. /* SPDX-License-Identifier: BSD-3-Clause */
  2. /*
  3. * This is from the Android Project,
  4. * Repository: https://android.googlesource.com/platform/system/core
  5. * File: libsparse/sparse_format.h
  6. * Commit: 28fa5bc347390480fe190294c6c385b6a9f0d68b
  7. * Copyright (C) 2010 The Android Open Source Project
  8. */
  9. #ifndef _LIBSPARSE_SPARSE_FORMAT_H_
  10. #define _LIBSPARSE_SPARSE_FORMAT_H_
  11. #include "sparse_defs.h"
  12. typedef struct sparse_header {
  13. __le32 magic; /* 0xed26ff3a */
  14. __le16 major_version; /* (0x1) - reject images with higher major versions */
  15. __le16 minor_version; /* (0x0) - allow images with higer minor versions */
  16. __le16 file_hdr_sz; /* 28 bytes for first revision of the file format */
  17. __le16 chunk_hdr_sz; /* 12 bytes for first revision of the file format */
  18. __le32 blk_sz; /* block size in bytes, must be a multiple of 4 (4096) */
  19. __le32 total_blks; /* total blocks in the non-sparse output image */
  20. __le32 total_chunks; /* total chunks in the sparse input image */
  21. __le32 image_checksum; /* CRC32 checksum of the original data, counting "don't care" */
  22. /* as 0. Standard 802.3 polynomial, use a Public Domain */
  23. /* table implementation */
  24. } sparse_header_t;
  25. #define SPARSE_HEADER_MAGIC 0xed26ff3a
  26. #define CHUNK_TYPE_RAW 0xCAC1
  27. #define CHUNK_TYPE_FILL 0xCAC2
  28. #define CHUNK_TYPE_DONT_CARE 0xCAC3
  29. #define CHUNK_TYPE_CRC32 0xCAC4
  30. typedef struct chunk_header {
  31. __le16 chunk_type; /* 0xCAC1 -> raw; 0xCAC2 -> fill; 0xCAC3 -> don't care */
  32. __le16 reserved1;
  33. __le32 chunk_sz; /* in blocks in output image */
  34. __le32 total_sz; /* in bytes of chunk input file including chunk header and data */
  35. } chunk_header_t;
  36. /* Following a Raw or Fill or CRC32 chunk is data.
  37. * For a Raw chunk, it's the data in chunk_sz * blk_sz.
  38. * For a Fill chunk, it's 4 bytes of the fill data.
  39. * For a CRC32 chunk, it's 4 bytes of CRC32
  40. */
  41. #endif