49 lines
2.0 KiB
C
49 lines
2.0 KiB
C
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/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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typedef struct sparse_header {
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uint32_t magic; /* 0xed26ff3a */
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uint16_t major_version; /* (0x1) - reject images with higher major versions */
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uint16_t minor_version; /* (0x0) - allow images with higer minor versions */
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uint16_t file_hdr_sz; /* 28 bytes for first revision of the file format */
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uint16_t chunk_hdr_sz; /* 12 bytes for first revision of the file format */
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uint32_t blk_sz; /* block size in bytes, must be a multiple of 4 (4096) */
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uint32_t total_blks; /* total blocks in the non-sparse output image */
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uint32_t total_chunks; /* total chunks in the sparse input image */
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uint32_t image_checksum; /* CRC32 checksum of the original data, counting "don't care" */
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/* as 0. Standard 802.3 polynomial, use a Public Domain */
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/* table implementation */
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} sparse_header_t;
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#define SPARSE_HEADER_MAGIC 0xed26ff3a
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#define CHUNK_TYPE_RAW 0xCAC1
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#define CHUNK_TYPE_FILL 0xCAC2
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#define CHUNK_TYPE_DONT_CARE 0xCAC3
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#define CHUNK_TYPE_CRC 0xCAC4
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typedef struct chunk_header {
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uint16_t chunk_type; /* 0xCAC1 -> raw; 0xCAC2 -> fill; 0xCAC3 -> don't care */
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uint16_t reserved1;
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uint32_t chunk_sz; /* in blocks in output image */
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uint32_t total_sz; /* in bytes of chunk input file including chunk header and data */
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} chunk_header_t;
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/* Following a Raw or Fill chunk is data. For a Raw chunk, it's the data in chunk_sz * blk_sz.
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* For a Fill chunk, it's 4 bytes of the fill data.
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*/
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