49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/*
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* Copyright (c) 2009 Thomas Schmitt
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*
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* This file is part of the libisofs project; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation. See COPYING file for details.
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*/
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#ifndef LIBISO_MD5_H_
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#define LIBISO_MD5_H_
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/* The MD5 computation API is in libisofs.h : iso_md5_start() et.al. */
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/** Create a writer object for checksums and add it to the writer list of
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the given Ecma119Image.
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*/
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int checksum_writer_create(Ecma119Image *target);
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/* Function to identify and manage md5sum indice of the old image.
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* data is supposed to be a 4 byte integer, bit 31 shall be 0,
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* value 0 of this integer means that it is not a valid index.
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*/
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int checksum_xinfo_func(void *data, int flag);
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/* Write stream detectable checksum tag to extra block.
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* All tag ranges start at the beginning of the System Area (i.e. t->ms_block)
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* and stem from the same MD5 computation context. Tag types 2 and 3 are
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* intermediate checksums. Type 2 announces the existence of type 3.
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* If both match, then at least the directory tree is trustworthy.
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* Type 1 is written at the very end of the session. If it matches, then
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* the whole image is trustworthy.
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* @param t The image being written
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* @param pos The LBA where this tag block is supposed to be written
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* @flag bit0-7= tag type
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* 1= session tag (End checksumming.)
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* 2= superblock tag (System Area and Volume Descriptors)
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* 3= tree tag (ECMA-119 and Rock Ridge tree)
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*/
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int iso_md5_write_tag(Ecma119Image *t, uint32_t pos, int flag);
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#endif /* ! LIBISO_MD5_H_ */
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