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Bit

  • Import can read any file as a sequence of single bits.
  • Export writes a list of 0s and 1s to a binary file.

Background & Context

    • Uniform sequence of bits.
    • Binary data format.

Import & Export

  • Import["file","Bit"] imports an arbitrary file as a sequence of bits, returning a packed array of 0s and 1s.
  • Export["file",list,"Bit"] exports a list of 0s and 1s to a binary sequence of bits.
  • Import["file",{"Bit",elem}] or Import["file",elem ] imports the specified element from file.
  • Import["file",{"Bit",{elem1,elem2,…}}] imports multiple elements.
  • See the following reference pages for full general information:
  • Import, Exportimport from or export to a file
    CloudImport, CloudExportimport from or export to a cloud object
    ImportString, ExportStringimport from or export to a string
    ImportByteArray, ExportByteArrayimport from or export to a byte array

Import Elements

  • General Import elements:
  • "Elements" list of elements and options available in this file
    "Summary"summary of the file
    "Rules"list of rules for all available elements
  • Data representation element:
  • "Data"list of single bits (0 or 1)
  • By default, Import and Export use the "Data" element.
  • Import["file",{"Bit",n}] gives the n^(th) bit from file.
  • Export["file",list,"Bit"] pads list with zeros at the end if the number of bits to be exported is not a multiple of 8.

Options

  • Import option:
  • "HeaderBytes"0how many bytes to skip at the beginning of the file

Examples

Basic Examples  (1)Summary of the most common use cases

Convert a text string to a list of bits:

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In[1]:=1
✖
https://wolfram.com/xid/0cvl7hg-qfp16k
Direct link to example
Out[1]=1

Convert a list of 0s and 1s:

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In[2]:=2
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https://wolfram.com/xid/0cvl7hg-mpslpj
Direct link to example
Out[2]=2

Export automatically pads with 0s if necessary:

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In[3]:=3
✖
https://wolfram.com/xid/0cvl7hg-3oyf5g
Direct link to example
Out[3]=3