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hoe to read and write bits from/to the file in C

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hi, i am making a compression program using huffman algo,for which i have to read and write on the file in the form of bits. stdio.h does not provide functions for reading and writing bits to a file. if any one knows the solution please reply(please explain in detail). also if someone knows a good site regarding huffman compression do refer it.

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You don''t read single bits from a file. That would take forever. Read 1 byte, or more, and then mask out the bits with binary operators.

To get the single bits, try something like this

unsigned int a = 0x000000A6; // ... 00000000 10100110

a & 0x01 = 0 // least significant bit
(a>>1) & 0x01 = 1
(a>>2) & 0x01 = 1
(a>>3) & 0x01 = 0
(a>>7) & 0x01 = 1

When writing, just do the opposite.

There is an excellent tutorial on Huffman here on GameDev:

Regards Mats

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If you really want to learn about compression algorithms, buy

The Data Compression Book by Mark Nelson (M&T Books)

It also includes code snippets for the most popular compression methods and a BitIO library which does exactly what you request.

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