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DOCS: Rework Portable storage format example

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@jtgrassie pointed out that the example I provided was colored incorrectly. He also made the good point that the image wasn't easy to review/correct. I reworked the example so that it's text-only. It's easier to review and edit, and reveals the structure better in my opinion. Also this is easier for people who can't distinguish colors as easily.

Make sure to double-check this work because there's a decent chance I screwed up the comments. The actual byte data was generated and should be solid.
This commit is contained in:
Jeffrey Ryan 2022-05-11 13:30:09 -05:00
parent 9750e1fa10
commit 564fa30966
2 changed files with 45 additions and 3 deletions
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48
docs/PORTABLE_STORAGE.md
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@ -158,7 +158,7 @@ that most will be familiar with):
```json
{
"short_quote": "Give me liberty or give me death!",
"short_quote": "Give me liberty or give me death",
"long_quote": "Monero is more than just a technology. It's also what the technology stands for.",
"signed_32bit_int": 20140418,
"array_of_bools": [true, false, true, true],
@ -169,9 +169,51 @@ that most will be familiar with):
}
```
This would translate to:
This object would translate into the following bytes when serialized into epee portable storage format. The bytes are represented in hex, with comments and whitespace added for readability.
![Epee binary storage format example](/docs/images/storage_binary_example.png)
```
01 11 01 01 01 01 02 01 // Signature
01 // Version
14 // Varint number of section entries (5)
0b // Length of next section key (11)
73 68 6f 72 74 5f 71 75 6f 74 65 // Section key ("short_quote")
0a // Type code (STRING)
80 // Varint length of string (32)
47 69 76 65 20 6d 65 20 6c 69 62 65 72 74 79 20 // STRING value ("Give me liberty ")
6f 72 20 67 69 76 65 20 6d 65 20 64 65 61 74 68 // STRING value cont. ("or give me death")
0a // Length of next section key (10)
6c 6f 6e 67 5f 71 75 6f 74 65 // Section key ("long_quote")
0a // Type code (STRING)
41 01 // Varint length of string (80). Note it's 2 bytes
4d 6f 6e 65 72 6f 20 69 73 20 6d 6f 72 65 20 74 // STRING value ("Monero is more t")
68 61 6e 20 6a 75 73 74 20 61 20 74 65 63 68 6e // STRING value cont. ("han just a techn")
6f 6c 6f 67 79 2e 20 49 74 27 73 20 61 6c 73 6f // STRING value cont. ("ology. It's also")
20 77 68 61 74 20 74 68 65 20 74 65 63 68 6e 6f // STRING value cont. (" what the techno")
6c 6f 67 79 20 73 74 61 6e 64 73 20 66 6f 72 2e // STRING value cont. ("logy stands for.")
10 // Length of next section key (16)
73 69 67 6e 65 64 5f 33 32 62 69 74 5f 69 6e 74 // Section key ("signed_32bit_int")
02 // type code (INT32)
82 51 33 01 // INT32 value (20140418)
0e // Length of next section key (14)
61 72 72 61 79 5f 6f 66 5f 62 6f 6f 6c 73 // Section key ("array_of_bools")
8b // Type code (BOOL | FLAG_ARRAY)
10 // Varint number of array elements (4)
01 00 01 01 // Array BOOL values [true, false, true, true]
0e // Length of next section key (14)
6e 65 73 74 65 64 5f 73 65 63 74 69 6f 6e // Section key ("nested_section")
0c // Type code (OBJECT)
08 // Varint number of inner section entries (2)
06 // Length of first inner section key (6)
64 6f 75 62 6c 65 // Section key ("double")
09 // Type code (DOUBLE)
9a 99 99 99 99 99 1b c0 // DOUBLE value (-6.9)
12 // Length of second inner section key (18)
75 6e 73 69 67 6e 65 64 5f 36 34 62 69 74 5f 69 // Section key ("unsigned_64bit_i")
6e 74 // Section key cont ("nt")
05 // Type code (UINT64)
c7 71 ac b5 af 98 32 9a // UINT64 value (11111111111111111111)
```
## Monero specifics

BIN
docs/images/storage_binary_example.png
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