2021-08-18 19:03:20 +00:00
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# Symbolic Link format
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Files start with `ID` (`0x49 0x44`). Files are interpreted as plaintext in the
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system ANSI codepage.
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## Basics
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The file consists of a series of plaintext records. Records are separated by
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newline characters (both `\r\n` and `\n` newlines are accepted by newer versions
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of Excel, but generated files should prefer CRLF).
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### Fields
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A record consists of a record type and a series of fields. Each part of the
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record is separated by a single `;` character.
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The literal semicolon is encoded as two consecutive semicolons `;;`. Example:
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```
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C;Y1;X1;K"abc;;def"
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```
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### Encoding
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In addition to the escaped semicolon, Excel understand two types of Encodings:
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#### Raw Byte Trigrams
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Trigrams matching the pattern `\x1B[\x20-\x2F][\x30-\x3F]` are decoded into a
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single byte whose high bits are taken from the second character and whose low
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bits are taken from the third character.
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For example. `"\x1B :" == "\x1B\x20\x3A` encodes the byte `"\x0A"` (newline)
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`"\x1B#;` encodes a literal semicolon.
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#### Special Escapes
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Excel also understands a set of special escapes that start with `\x1BN`. For
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clarity, the `\x1BN` part is not included in the table:
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2021-08-21 20:51:02 +00:00
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| | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | A | B | C | D | E | F |
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|:---|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|
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|`0_`| | | | | | | | | | | | | | | | |
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|`1_`| | | | | | | | | | | | | | | | |
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|`2_`| | | `*`| `&`| | | | `)`| | | | | | `P`| | |
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|`3_`| | | | | | | | | | | | | | | | |
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|`4_`| | | | | | | | | | | | | | | | |
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|`5_`| | | | | | | | | | | | | | | | |
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|`6_`| | | | | | | | | | | | | | | | |
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|`7_`| | | | | | | | | | | | | | | | |
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|`8_`| | | | | | | | | | | | | `j`| | | |
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|`9_`| | | | | | | | | | | | | `z`| | | |
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|`A_`| | `!`| `"`| `#`| `(`| `%`| | `'`|`H `| `S`| `c`| `+`| | | `R`| |
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|`B_`|`J `| `1`| `2`| `3`|`B `| `5`| `6`| `7`| | `Q`| `k`| `;`| `<`| `=`| `>`| `?`|
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|`C_`|`AA`|`BA`|`CA`|`DA`|`HA`|`JA`| `a`|`KC`|`AE`|`BE`|`CE`|`HE`|`AI`|`BI`|`CI`|`HI`|
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|`D_`| `b`|`DN`|`AO`|`BO`|`CO`|`DO`|`HO`| | `i`|`AU`|`BU`|`CU`|`HU`| | `l`| `{`|
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|`E_`|`Aa`|`Ba`|`Ca`|`Da`|`Ha`|`Ja`| `q`|`Kc`|`Ae`|`Be`|`Ce`|`He`|`Ai`|`Bi`|`Ci`|`Hi`|
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|`F_`| `s`|`Dn`|`Ao`|`Bo`|`Co`|`Do`|`Ho`| | `y`|`Au`|`Bu`|`Cu`|`Hu`| | `|`|`Hy`|
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For example, `\x1BNj` encodes byte `0x8C`
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- Both `\x1BN0` and `\x1BNJ ` appear to encode `0xB0`
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- Both `\x1BN9` and `\x1BN)` appear to encode `0x27`
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- Bytes `0xA8`, `0xB0` and `0xB4` have space characters (` `) after the letter.
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Byte `0xA8` is encoded as `\x1BNH\x20`
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2021-08-18 19:03:20 +00:00
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## Record Types
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| Record Type | Description |
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|:------------|:---------------------|
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| `ID` | Header |
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| `E` | EOF |
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| `B` | Worksheet Dimensions |
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| `O` | Options |
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| `P` | Number Format |
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| `F` | Formatting |
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| `C` | Cell |
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## EOF Record (E)
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There are no fields.
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## Cell Record (C)
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### Comments
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The `A` field of the `C` record can specify plaintext comments. They are encoded
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using the same text encoding in `K` fields.
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### Shared Formulae
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The `S` field of the `C` record signals that a cell is using a shared formula.
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The `R` and `C` fields are the 1-indexed row and column indices of the cell with
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the formula. The formula should be extracted from the original location and
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shifted to the current cell (relative references adjusted by the offset).
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[](https://github.com/SheetJS/notes)
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