Read and write into a BMP + binary data?

I need your help!
When I read a BMP file: bitmap file.
What the function can I use to read the BMP file (byte by byte, and bit by bit)?

What the function can I use to write into BMP file(byte by byte, bit by bit), in anywhere on that BMP file?
Because I 'll pass the header of BMP ( exaclly,the first 100 byte header of BMP file).

What funtion can I read a TEXT file and CONVERT it( text) into the ANSII file and(or) CONVERT it into Binary data(0101)?

Thank for help!^__^@!
Thank! But I can't search fastly the function what I need?
Please show me ( minimun that) the function which are indispensable( need for me) to solve the proplem, read a BMP file,and write into it.( Byte by byte or bit by bit).
nickqueen wrote:
Because I 'll pass the header of BMP ( exaclly,the first 100 byte header of BMP file).

What do you mean?
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