CONTENT-BASED SEGMENTATION SCHEME FOR DATA COMPRESSION IN STORAGE AND TRANSMISSION INCLUDING HIERARCHICAL SEGMENT REPRESENTATION
First Claim
1. A method of encoding input data within a system, wherein the input data might include sequences of symbols that repeat in the input data or occur in other input data encoded in the system, the method comprising:
- identifying, within a number of sequential input data symbols defined by an offset and a window size, a fingerprint representation of the number of sequential input data symbols;
determining, from the fingerprint representation, whether the offset is to be designated as a cut point;
repeating the above steps of identifying and determining to arrive at a set of cut points;
segmenting the input data as indicated by the set of cut points;
for each segment, determining whether the segment is to be a referenced segment or an unreferenced segment;
for each referenced segment, replacing the segment data of the referenced segment with a reference label;
for each referenced segment not already present in a persistent segment store, storing a reference binding in the persistent segment store, wherein a reference binding associates a referenced segment'"'"'s data and its reference label;
determining whether any sequence of segments is to be grouped as a reference group;
for each reference group, replacing the references in the group with a group label; and
for each reference group not already present in the persistent segment store, storing a group reference binding in the persistent segment store, wherein a group reference binding associates a reference group'"'"'s references with its group label.
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Abstract
In a coding system, input data within a system is encoded. The input data might include sequences of symbols that repeat in the input data or occur in other input data encoded in the system. The encoding includes determining a target segment size, determining a window size, identifying a fingerprint within a window of symbols at an offset in the input data, determining whether the offset is to be designated as a cut point and segmenting the input data as indicated by the set of cut points. For each segment so identified, the encoder determines whether the segment is to be a referenced segment or an unreferenced segment, replacing the segment data of each referenced segment with a reference label and storing a reference binding in a persistent segment store for each referenced segment, if needed. Hierarchically, the process can be repeated by grouping references into groups, replacing the grouped references with a group label, storing a binding between the grouped references and group label, if one is not already present, and repeating the process. The number of levels of hierarchy can be fixed in advanced or it can be determined from the content encoded.
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Citations
1 Claim
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1. A method of encoding input data within a system, wherein the input data might include sequences of symbols that repeat in the input data or occur in other input data encoded in the system, the method comprising:
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identifying, within a number of sequential input data symbols defined by an offset and a window size, a fingerprint representation of the number of sequential input data symbols; determining, from the fingerprint representation, whether the offset is to be designated as a cut point; repeating the above steps of identifying and determining to arrive at a set of cut points; segmenting the input data as indicated by the set of cut points; for each segment, determining whether the segment is to be a referenced segment or an unreferenced segment; for each referenced segment, replacing the segment data of the referenced segment with a reference label; for each referenced segment not already present in a persistent segment store, storing a reference binding in the persistent segment store, wherein a reference binding associates a referenced segment'"'"'s data and its reference label; determining whether any sequence of segments is to be grouped as a reference group; for each reference group, replacing the references in the group with a group label; and for each reference group not already present in the persistent segment store, storing a group reference binding in the persistent segment store, wherein a group reference binding associates a reference group'"'"'s references with its group label.
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Specification