# US 2008/0189601 A1 · System and method for creating a compressed file > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0189601 A1 - Document ID: US20080189601A1 - Status: Published application - Kind: A1 - Application number: 11/207,684 - Filed: 2005-08-18 - Published: 2008-08-07 - Earliest claimed: 2005-08-18 - Assignees: Adobe Systems Incorporated - Inventors: Oliver Goldman - Web page: https://patentgrep.com/patent/US20080189601A1 ## CPC - G06F 40/123: Storage facilities - G06F 40/131: Fragmentation of text files, e.g. creating reusable text-blocks; Linking to fragments, e.g. using XInclude; Namespaces - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract Systems and methods provide mechanisms to create documents in page descriptor formats using file utilities that create compressed file formats. The resulting files may be rendered with a compressed file utility as well as a reader for the documents in page descriptor format. ## Claims ### Claim 1 A method comprising: incorporating a document in a page descriptor format into a compressed file; calculating an offset into said compressed file of said document in a page descriptor format; writing a copy of a cross-reference table associated with said document in a page descriptor format to said compressed file; and updating values in said copy of said cross reference table based on said offset. ### Claim 2 (depends on 1) The method of claim 1, further comprising: providing a file utility to uncompress and display the contents of said compressed file. ### Claim 3 (depends on 1) The method of claim 1, wherein said compressed file comprises a first file header, a second file header, and a contents index; and wherein said document in a page descriptor format is associated with said first file header; and further wherein said copy of said cross-reference table is associated with said second file header. ### Claim 4 (depends on 3) The method of claim 3, wherein said first file header is located at the beginning of said compressed file; said document in a page descriptor format is located after said first file header; said second file header is located after said document in a page descriptor format; said copy of said cross-reference table is located after said second file header; and said contents index is located after said copy of said cross-reference table. ### Claim 5 (depends on 4) The method of claim 4, further comprising: providing a reader to render said document in a page descriptor format. ### Claim 6 (depends on 5) The method of claim 5, wherein said reader renders said document in a page descriptor format by: reading said compressed file beginning at the end of said compressed file; skipping over said contents index at the end of said compressed file; identifying said copy of said cross-reference table; extracting one of said values from said copy of said cross-reference table; and rendering said document in a page descriptor format beginning at a location identified by said one of said values. ### Claim 7 (depends on 3) The method of claim 3, wherein said offset is determined by the size of said first file header. ### Claim 8 (depends on 1) The method of claim 1, wherein said offset is determined by: searching through said compressed file for said document in a page descriptor format; and identifying the location of a header in said document in a page descriptor format. ### Claim 9 (depends on 5) The method of claim 5, wherein said reader reads said contents index; said reader identifies an entry in said contents index containing a location for said copy of said cross-reference table; said reader branches to said location and reads said copy of said cross-reference table; said reader extracts one of said values in said copy of said cross-reference table; and said reader renders a portion of said document in a page descriptor format identified by said one of said values. ### Claim 10 (depends on 1) The method of claim 1, wherein said compressed file comprises a ZIP file format. ### Claim 11 (depends on 1) The method of claim 1, wherein said document in a page descriptor format comprises a Portable Document Format. ### Claim 12 A machine readable medium comprising instructions thereon for executing a method comprising: incorporating a document in a page descriptor format into a compressed file; calculating an offset into said compressed file of said document in a page descriptor format; writing a copy of a cross-reference table associated with said document in a page descriptor format to said compressed file; and updating values in said copy of said cross reference table based on said offset. ### Claim 13 (depends on 12) The machine readable medium of claim 12, further comprising instructions for: providing a file utility to uncompress and display the contents of said compressed file. ### Claim 14 (depends on 12) The machine readable medium of claim 12, wherein said compressed file comprises a first file header, a second file header, and a contents index; and wherein said document in a page descriptor format is associated with said first file header; and further wherein said copy of said cross-reference table is associated with said second file header. ### Claim 15 (depends on 14) The machine readable medium of claim 14, wherein said first file header is located at the beginning of said compressed file; said document in a page descriptor format is located after said first file header; said second file header is located after said document in a page descriptor format; said copy of said cross-reference table is located after said second file header; and said contents index is located after said copy of said cross-reference table. ### Claim 16 (depends on 14) The machine readable medium of claim 14, further comprising instructions for: providing a reader to render said document in a page descriptor format. ### Claim 17 (depends on 14) The machine readable medium of claim 14, further comprising instructions for: uncompressing said compressed file. ### Claim 18 (depends on 16) The machine readable medium of claim 16, wherein said reader renders said document in a page descriptor format by: reading said compressed file beginning at the end of said compressed file; skipping over said contents index at the end of said compressed file; identifying said copy of said cross-reference table; extracting one of said values from said copy of said cross-reference table; and rendering said document in a page descriptor format beginning at a location identified by said one of said values. ### Claim 19 (depends on 16) The machine readable medium of claim 16, wherein said reader reads said contents index; said reader identifies an entry in said contents index containing a location for said copy of said cross-reference table; said reader branches to said location and extracts said one of said values associated with said document in a page descriptor format; and said reader renders a portion of said document in page descriptor format identified by said one of said values. ### Claim 20 (depends on 12) The machine readable medium of claim 12, wherein said compressed file comprises a ZIP file format. ### Claim 21 (depends on 12) The machine readable medium of claim 12, wherein said document in a page descriptor format comprises a Portable Document Format. ### Claim 22 A system comprising: a processor; a memory; a display unit; and a compressed filed stored in said memory, said compressed file comprising: a document in a page descriptor format located at an offset from the beginning of said compressed file; and a copy of a cross-reference table associated with said document in a page descriptor format, wherein values in said copy of said cross-reference table comprise updated values based on said offset. ### Claim 23 (depends on 22) The system of claim 22, further comprising: a first file header associated with said document in a page descriptor format; a second file header associated with said table; and a contents index. ### Claim 24 (depends on 23) The system of claim 23, wherein said first file header is located at the beginning of said compressed file; said document in a page descriptor format is located after said first file header; said second file header is located after said document in a page descriptor format; said copy of said cross-reference table is located after said second file header; and said contents index is located after said copy of said cross-reference table. ### Claim 25 (depends on 22) The system of claim 22, further comprising a utility to render said document in a page descriptor format; wherein said utility extracts a value associated with said document in a page descriptor format from said copy of said cross-reference table; and said utility renders a portion of said document in a page descriptor format identified by said value. ### Claim 26 (depends on 23) The system of claim 23, further comprising a utility to render said document in a page descriptor format; wherein said utility: reads said contents index; identifies a location in said contents index containing a location for said copy of said cross-reference table; branches to said location; extracts said value associated with said document in a page descriptor format from said copy of said cross-reference table; and renders a portion of said document in a page descriptor format identified by said value. ### Claim 27 (depends on 22) The system of claim 22, wherein said compressed file format comprises a ZIP file; and further wherein said document in a page descriptor format comprises a Portable Document Format.