Keep only base/extractor.[cc|h].

third_party/lzma/v4_65/files/7zC.txt

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-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