creates, loads, manipulates and writes ISO 9660 filesystem images with Rock Ridge extensions. It is suitable for incremental data backup and for production of bootable ISO 9660 images. GNU xorriso is a statical compilation of the libraries libburn, libisofs, libisoburn, and libjte.
| checksums.txt (xorriso-1.5.2) | : | checksums.txt (xorriso-1.5.4) |
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| skipping to change at line 78 | | skipping to change at line 78 |
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| Tag_id pos=# range_start=# range_size=# [session_start|next=#] md5=# self=#\n | | Tag_id pos=# range_start=# range_size=# [session_start|next=#] md5=# self=#\n |
| | |
| Tag_id distinguishes the following tag types | | Tag_id distinguishes the following tag types |
| "libisofs_rlsb32_checksum_tag_v1" Relocated 64 kB superblock tag | | "libisofs_rlsb32_checksum_tag_v1" Relocated 64 kB superblock tag |
| "libisofs_sb_checksum_tag_v1" Superblock tag | | "libisofs_sb_checksum_tag_v1" Superblock tag |
| "libisofs_tree_checksum_tag_v1" Directory tree tag | | "libisofs_tree_checksum_tag_v1" Directory tree tag |
| "libisofs_checksum_tag_v1" Session tag | | "libisofs_checksum_tag_v1" Session tag |
| | |
| A relocated superblock may appear at LBA 0 of an image which was produced for | | A relocated superblock may appear at LBA 0 of an image which was produced for |
|
| being stored in a disk file or on overwriteable media (e.g. DVD+RW, BD-RE). | | being stored in a disk file or on overwritable media (e.g. DVD+RW, BD-RE). |
| Typically there is a first session recorded with a superblock at LBA 32 and | | Typically there is a first session recorded with a superblock at LBA 32 and |
| the next session may follow shortly after its session tag. (Typically at the | | the next session may follow shortly after its session tag. (Typically at the |
| next block address which is divisible by 32.) Normally no session starts after | | next block address which is divisible by 32.) Normally no session starts after |
| the address given by parameter session_start=. | | the address given by parameter session_start=. |
| | |
| Session oriented media like CD-R[W], DVD+R, BD-R will have no relocated | | Session oriented media like CD-R[W], DVD+R, BD-R will have no relocated |
| superblock but rather bear a table-of-content on media level (to be inquired | | superblock but rather bear a table-of-content on media level (to be inquired |
| by MMC commands). | | by MMC commands). |
| | |
| Example: | | Example: |
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| skipping to change at line 128 | | skipping to change at line 128 |
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| pos= | | pos= |
| gives the block address where the tag supposes itself to be stored. | | gives the block address where the tag supposes itself to be stored. |
| If this does not match the block address where the tag is found then this | | If this does not match the block address where the tag is found then this |
| either indicates that the tag is payload of the image or that the image has | | either indicates that the tag is payload of the image or that the image has |
| been relocated. (The latter makes the image unusable.) | | been relocated. (The latter makes the image unusable.) |
| | |
| range_start= | | range_start= |
| The block address where the session is supposed to start. If this does not | | The block address where the session is supposed to start. If this does not |
| match the session start on media then the volume descriptors of the | | match the session start on media then the volume descriptors of the |
|
| image have been relocated. (This can happen with overwriteable media. If | | image have been relocated. (This can happen with overwritable media. If |
| checksumming started at LBA 0 and finds range_start=32, then one has to | | checksumming started at LBA 0 and finds range_start=32, then one has to |
| restart checksumming at LBA 32. See libburn/doc/cookbook.txt | | restart checksumming at LBA 32. See libburn/doc/cookbook.txt |
|
| "ISO 9660 multi-session emulation on overwriteable media" for background | | "ISO 9660 multi-session emulation on overwritable media" for background |
| information.) | | information.) |
| | |
| range_size= | | range_size= |
| The number of blocks beginning at range_start which are covered by the | | The number of blocks beginning at range_start which are covered by the |
| checksum of the tag. | | checksum of the tag. |
| | |
| Only with superblock tag and tree tag: | | Only with superblock tag and tree tag: |
| next= | | next= |
| The block address where the next tag is supposed to be found. This is | | The block address where the next tag is supposed to be found. This is |
| to avoid the small possibility that a checksum tag with matching position | | to avoid the small possibility that a checksum tag with matching position |
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| skipping to change at line 227 | | skipping to change at line 227 |
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| and range_size match the state of block reading, and whether the returned | | and range_size match the state of block reading, and whether the returned |
| bytes in parameter md5 match the MD5 computed from the data blocks which were | | bytes in parameter md5 match the MD5 computed from the data blocks which were |
| read before the tag block. | | read before the tag block. |
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| Checking All Sessions | | Checking All Sessions |
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| If the media is sequentially recordable, obtain a table of content and check | | If the media is sequentially recordable, obtain a table of content and check |
| the first track of each session as prescribed above in Checking Before Image | | the first track of each session as prescribed above in Checking Before Image |
| Tree Loading and in Checking the Data Part of the Session. | | Tree Loading and in Checking the Data Part of the Session. |
| | |
|
| With disk files or overwriteable media, look for a relocated superblock tag | | With disk files or overwritable media, look for a relocated superblock tag |
| but do not hop to address next_tag (given by session_start=). Instead look at | | but do not hop to address next_tag (given by session_start=). Instead look at |
| LBA 32 for the first session and check it as prescribed above. | | LBA 32 for the first session and check it as prescribed above. |
| After reaching its end, round up the read address to the next multiple of 32 | | After reaching its end, round up the read address to the next multiple of 32 |
| and check whether it is smaller than session_start= from the super block. | | and check whether it is smaller than session_start= from the super block. |
| If so, expect another session to start there. | | If so, expect another session to start there. |
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| Checking Single Files in a Loaded Image | | Checking Single Files in a Loaded Image |
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| An image may consist of many sessions wherein many data blocks may not belong | | An image may consist of many sessions wherein many data blocks may not belong |
| to files in the directory tree of the most recent session. Checking this | | to files in the directory tree of the most recent session. Checking this |
| | | |
| End of changes. 4 change blocks. |
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| 4 lines changed or deleted | | 4 lines changed or added |
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