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48 lines
1.2 KiB
Markdown
48 lines
1.2 KiB
Markdown
---
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title: "Human Readable Sizes"
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date: 2021-03-15T19:11:35-04:00
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draft: false
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tags: []
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math: true
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---
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When playing with large and small values, it is useful to convert them to a different unit in scientific notation. Let's look at bytes.
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```python
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size_categories = ["B", "KB", "MB", "GB", "TB"]
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```
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You can figure out how to best represent it by seeing how many of the base (in this case 1000) fits into the value.
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$$
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category = \lfloor \frac{\log{(size_{bytes})}}{\log{(base)}} \rfloor
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$$
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You'll want to make sure that you don't overflow in the number of categories you have
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```python
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category_num = min(category_num, len(size_categories))
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```
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You can then get its category representation by
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$$
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size = \frac{size_{bytes}}{(2^{category})}
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$$
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We can wrap this all up info a nice python function
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```python
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def humanReadableBytes(num_bytes: int) -> str:
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base = 1000
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# Zero Case
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if num_bytes == 0:
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return "0"
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size_categories = ["B", "KB", "MB", "GB", "TB"]
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category_num = int(math.log(num_bytes) / math.log(base))
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# Make sure it doesn't overflow
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category_num = min(category_num, len(size_categories) - 1)
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return "{:.2f} ".format(num_bytes / (base ** category_num)) + \
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size_categories[category_num]
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```
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