Estsoft Corp.

Yun-Sik Oh

An apparatus for compressing and decompressing data is disclosed. The apparatus for compressing data includes a block setting unit that divides data of at least one original file into two or more blocks, a compression unit that generates block compression data by applying a compression algorithm to data corresponding to at least one block among blocks divided by the block setting unit, and a compression file generation unit that generates a block header and the block body of the block for each block divided by the block setting unit, in which the block body includes the block compression data if the block is compressed by the compression unit or includes the original data of the block if the block is not compressed the by compression unit.

Method and apparatus for compressing and decompressing block unit data

A forward compatibility guaranteed data compression and decompression method and apparatus are provided. The compressed data decompression apparatus includes a compressed file parsing unit which parses a compressed file comprising compressed data, a header including information on the compressed data and an extension field to extract the compressed data, and an original file generating unit which decompresses the compressed data to generate an original file. The extension field includes one or more extension field units and an extension field terminating code indicating an end of a region capable of including the extension field units, each of the header and the extension field units starts with a data identification code having the same number of bytes, and the extension field unit further includes its own length data separated by a predetermined number of bytes from its own data identification code. If the data identification code of the extension field unit is not defined while the parsing is carried out based on the data identification code, the compressed file parsing unit skips the extension field unit using the length data without processing the extension field unit.

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Seoul, South Korea

Yun-Sik Oh