diff options
Diffstat (limited to 'src/libs/7zip/unix/7zC.txt')
| -rw-r--r-- | src/libs/7zip/unix/7zC.txt | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/src/libs/7zip/unix/7zC.txt b/src/libs/7zip/unix/7zC.txt deleted file mode 100644 index 5d5d06d7b..000000000 --- a/src/libs/7zip/unix/7zC.txt +++ /dev/null @@ -1,194 +0,0 @@ -7z ANSI-C Decoder 4.62 ----------------------- - -7z ANSI-C provides 7z/LZMA decoding. -7z ANSI-C version is simplified version ported from C++ code. - -LZMA is default and general compression method of 7z format -in 7-Zip compression program (www.7-zip.org). LZMA provides high -compression ratio and very fast decompression. - - -LICENSE -------- - -7z ANSI-C Decoder is part of the LZMA SDK. -LZMA SDK is written and placed in the public domain by Igor Pavlov. - -Files ---------------------- - -7zDecode.* - Low level 7z decoding -7zExtract.* - High level 7z decoding -7zHeader.* - .7z format constants -7zIn.* - .7z archive opening -7zItem.* - .7z structures -7zMain.c - Test application - - -How To Use ----------- - -You must download 7-Zip program from www.7-zip.org. - -You can create .7z archive with 7z.exe or 7za.exe: - - 7za.exe a archive.7z *.htm -r -mx -m0fb=255 - -If you have big number of files in archive, and you need fast extracting, -you can use partly-solid archives: - - 7za.exe a archive.7z *.htm -ms=512K -r -mx -m0fb=255 -m0d=512K - -In that example 7-Zip will use 512KB solid blocks. So it needs to decompress only -512KB for extracting one file from such archive. - - -Limitations of current version of 7z ANSI-C Decoder ---------------------------------------------------- - - - It reads only "FileName", "Size", "LastWriteTime" and "CRC" information for each file in archive. - - It supports only LZMA and Copy (no compression) methods with BCJ or BCJ2 filters. - - It converts original UTF-16 Unicode file names to UTF-8 Unicode file names. - -These limitations will be fixed in future versions. - - -Using 7z ANSI-C Decoder Test application: ------------------------------------------ - -Usage: 7zDec <command> <archive_name> - -<Command>: - e: Extract files from archive - l: List contents of archive - t: Test integrity of archive - -Example: - - 7zDec l archive.7z - -lists contents of archive.7z - - 7zDec e archive.7z - -extracts files from archive.7z to current folder. - - -How to use .7z Decoder ----------------------- - -Memory allocation -~~~~~~~~~~~~~~~~~ - -7z Decoder uses two memory pools: -1) Temporary pool -2) Main pool -Such scheme can allow you to avoid fragmentation of allocated blocks. - - -Steps for using 7z decoder --------------------------- - -Use code at 7zMain.c as example. - -1) Declare variables: - inStream /* implements ILookInStream interface */ - CSzArEx db; /* 7z archive database structure */ - ISzAlloc allocImp; /* memory functions for main pool */ - ISzAlloc allocTempImp; /* memory functions for temporary pool */ - -2) call CrcGenerateTable(); function to initialize CRC structures. - -3) call SzArEx_Init(&db); function to initialize db structures. - -4) call SzArEx_Open(&db, inStream, &allocMain, &allocTemp) to open archive - -This function opens archive "inStream" and reads headers to "db". -All items in "db" will be allocated with "allocMain" functions. -SzArEx_Open function allocates and frees temporary structures by "allocTemp" functions. - -5) List items or Extract items - - Listing code: - ~~~~~~~~~~~~~ - { - UInt32 i; - for (i = 0; i < db.db.NumFiles; i++) - { - CFileItem *f = db.db.Files + i; - printf("%10d %s\n", (int)f->Size, f->Name); - } - } - - Extracting code: - ~~~~~~~~~~~~~~~~ - - SZ_RESULT SzAr_Extract( - CArchiveDatabaseEx *db, - ILookInStream *inStream, - UInt32 fileIndex, /* index of file */ - UInt32 *blockIndex, /* index of solid block */ - Byte **outBuffer, /* pointer to pointer to output buffer (allocated with allocMain) */ - size_t *outBufferSize, /* buffer size for output buffer */ - size_t *offset, /* offset of stream for required file in *outBuffer */ - size_t *outSizeProcessed, /* size of file in *outBuffer */ - ISzAlloc *allocMain, - ISzAlloc *allocTemp); - - If you need to decompress more than one file, you can send these values from previous call: - blockIndex, - outBuffer, - outBufferSize, - You can consider "outBuffer" as cache of solid block. If your archive is solid, - it will increase decompression speed. - - After decompressing you must free "outBuffer": - allocImp.Free(outBuffer); - -6) call SzArEx_Free(&db, allocImp.Free) to free allocated items in "db". - - - - -Memory requirements for .7z decoding ------------------------------------- - -Memory usage for Archive opening: - - Temporary pool: - - Memory for uncompressed .7z headers - - some other temporary blocks - - Main pool: - - Memory for database: - Estimated size of one file structures in solid archive: - - Size (4 or 8 Bytes) - - CRC32 (4 bytes) - - LastWriteTime (8 bytes) - - Some file information (4 bytes) - - File Name (variable length) + pointer + allocation structures - -Memory usage for archive Decompressing: - - Temporary pool: - - Memory for LZMA decompressing structures - - Main pool: - - Memory for decompressed solid block - - Memory for temprorary buffers, if BCJ2 fileter is used. Usually these - temprorary buffers can be about 15% of solid block size. - - -7z Decoder doesn't allocate memory for compressed blocks. -Instead of this, you must allocate buffer with desired -size before calling 7z Decoder. Use 7zMain.c as example. - - -Defines -------- - -_SZ_ALLOC_DEBUG - define it if you want to debug alloc/free operations to stderr. - - ---- - -http://www.7-zip.org -http://www.7-zip.org/sdk.html -http://www.7-zip.org/support.html |