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Update index.md

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Signed-off-by: naivewong <867245430@qq.com>
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Alec 2019-02-05 10:28:05 +08:00 committed by naivewong
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docs/format/index.md
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@ -176,24 +176,24 @@ The sequence of postings sections is finalized by an [offset table](#offset-tabl
An offset table stores a sequence of entries that maps a list of strings to an offset. They are used to track label index and postings sections. They are read into memory when an index file is loaded.
```
┌─────────────────────┬────────────────────┐
│ len <4b> │ #entries <4b> │
├─────────────────────┴────────────────────┤
│ ┌──────────────────────────────────────┐ │
│ │ n = #strs <uvarint> │ │
│ ├──────────────────────┬───────────────┤ │
│ │ len(str_1) <uvarint> │ str_1 <bytes> │ │
│ ├──────────────────────┴───────────────┤ │
│ │ ... │ │
│ ├──────────────────────┬───────────────┤ │
│ │ len(str_n) <uvarint> │ str_n <bytes> │ │
│ ├──────────────────────┴───────────────┤ │
│ │ offset <uvarint> │ │
│ └──────────────────────────────────────┘ │
│ . . . │
├──────────────────────────────────────────┤
│ CRC32 <4b> │
└──────────────────────────────────────────┘
┌─────────────────────┬──────────────────────┐
│ len <4b> │ #entries <4b> │
├─────────────────────┴──────────────────────┤
│ ┌────────────────────────────────────────┐ │
│ │ n = #strs <uvarint> │ │
│ ├──────────────────────┬─────────────────┤ │
│ │ len(str_1) <uvarint> │ str_1 <bytes> │ │
│ ├──────────────────────┴─────────────────┤ │
│ │ ... │ │
│ ├──────────────────────┬─────────────────┤ │
│ │ len(str_n) <uvarint> │ str_n <bytes> │ │
│ ├──────────────────────┴─────────────────┤ │
│ │ offset <uvarint64> │ │
│ └────────────────────────────────────────┘ │
│ . . . │
├────────────────────────────────────────────┤
│ CRC32 <4b> │
└────────────────────────────────────────────┘
```