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decompressing PNG IDAT chunks

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I''m having trouble decompressing (inflating) the data in the IDAT chunk. I''ve read numerous articles about Hoffman Codes and the LZ77 compression algorithm, but I haven''t been able to find anything that''s specific to PNG files. A tutorial or pseudocode would be ideal; if you know of any sites, please post the url. I''d like to thank you in advance for helping me with this.

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