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a83406f21b
The unsparsed chunk size is expressed in units of blk_sz. For RAW chunks
this is then limited to (just under) 32-bits due to the total_sz
(sparsed chunk size), but FILL and DONT_CARE can be much bigger.
But doing the size calculation on the 32-bit integers overflows and any
upper bits are lost, and the unsparsed result is wrong. So, switch this
to 64-bit instead.
It's unclear what happens if we pass a larger num_sectors to the
programmer, so this limitation is left, and checked for.
Fixes: 02c008adfd ("add support sparse attribute")
Signed-off-by: Bjorn Andersson <bjorn.andersson@oss.qualcomm.com>
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/* SPDX-License-Identifier: Apache-2.0 */
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/*
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* Copyright (C) 2010 The Android Open Source Project
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*/
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#ifndef __SPARSE_H__
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#define __SPARSE_H__
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#include <stdint.h>
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#include <stdio.h>
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typedef struct __attribute__((__packed__)) sparse_header {
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/* 0xed26ff3a */
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uint32_t magic;
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/* (0x1) - reject images with higher major versions */
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uint16_t major_version;
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/* (0x0) - allow images with higer minor versions */
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uint16_t minor_version;
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/* 28 bytes for first revision of the file format */
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uint16_t file_hdr_sz;
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/* 12 bytes for first revision of the file format */
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uint16_t chunk_hdr_sz;
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/* block size in bytes, must be a multiple of 4 (4096) */
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uint32_t blk_sz;
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/* total blocks in the non-sparse output image */
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uint32_t total_blks;
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/* total chunks in the sparse input image */
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uint32_t total_chunks;
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/*
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* 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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*/
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uint32_t image_checksum;
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} sparse_header_t;
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#define SPARSE_HEADER_MAGIC 0xed26ff3a
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#define SPARSE_HEADER_MAJOR_VER 0x0001
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#define SPARSE_HEADER_MINOR_VER 0x0000
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typedef struct __attribute__((__packed__)) 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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#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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/*
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* Parses the sparse image header from the file descriptor.
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* Returns 0 on success, or an error code otherwise.
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*/
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int sparse_header_parse(int fd, sparse_header_t *sparse_header);
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/*
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* Parses the sparse image chunk header from the file descriptor.
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* Sets the chunk size, and value or offset based on the parsed data.
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* Returns the chunk type on success, or an error code otherwise.
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*/
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int sparse_chunk_header_parse(int fd, sparse_header_t *sparse_header,
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uint64_t *chunk_size,
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uint32_t *value, off_t *offset);
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#endif
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