misc/libphysfs/lzma/7zC.txt
author Wuzzy <Wuzzy2@mail.ru>
Wed, 14 Feb 2018 17:08:14 +0100
changeset 12994 4d4b2fb88e50
parent 12213 bb5522e88ab2
permissions -rw-r--r--
Update README about the team chat key
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7z ANSI-C Decoder 4.48
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7z ANSI-C Decoder 4.48 Copyright (C) 1999-2006 Igor Pavlov
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7z ANSI-C provides 7z/LZMA decoding.
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7z ANSI-C version is simplified version ported from C++ code.
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LZMA is default and general compression method of 7z format
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in 7-Zip compression program (www.7-zip.org). LZMA provides high 
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compression ratio and very fast decompression.
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LICENSE
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Read lzma.txt for information about license.
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Files
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7zAlloc.*    - Allocate and Free
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7zBuffer.*   - Buffer structure
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7zCrc.*      - CRC32 code
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7zDecode.*   - Low level memory->memory decoding
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7zExtract.*  - High level stream->memory decoding
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7zHeader.*   - .7z format constants
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7zIn.*       - .7z archive opening
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7zItem.*     - .7z structures
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7zMain.c     - Test application
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7zMethodID.* - MethodID structure
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7zTypes.h    - Base types and constants
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How To Use
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----------
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You must download 7-Zip program from www.7-zip.org.
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You can create .7z archive with 7z.exe or 7za.exe:
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  7za.exe a archive.7z *.htm -r -mx -m0fb=255
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If you have big number of files in archive, and you need fast extracting, 
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you can use partly-solid archives:
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  7za.exe a archive.7z *.htm -ms=512K -r -mx -m0fb=255 -m0d=512K
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In that example 7-Zip will use 512KB solid blocks. So it needs to decompress only 
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512KB for extracting one file from such archive.
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Limitations of current version of 7z ANSI-C Decoder
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---------------------------------------------------
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 - It reads only "FileName", "Size", "LastWriteTime" and "CRC" information for each file in archive.
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 - It supports only LZMA and Copy (no compression) methods with BCJ or BCJ2 filters.
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 - It converts original UTF-16 Unicode file names to UTF-8 Unicode file names.
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These limitations will be fixed in future versions.
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Using 7z ANSI-C Decoder Test application:
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-----------------------------------------
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Usage: 7zDec <command> <archive_name>
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<Command>:
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  e: Extract files from archive
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  l: List contents of archive
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  t: Test integrity of archive
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Example: 
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  7zDec l archive.7z
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    78
lists contents of archive.7z
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    79
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    80
  7zDec e archive.7z
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    81
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    82
extracts files from archive.7z to current folder.
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    83
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    84
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    85
How to use .7z Decoder
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    86
----------------------
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    87
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    88
.7z Decoder can be compiled in one of two modes:
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    89
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    90
1) Default mode. In that mode 7z Decoder will read full compressed 
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    91
   block to RAM before decompressing.
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    92
  
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    93
2) Mode with defined _LZMA_IN_CB. In that mode 7z Decoder can read
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    94
   compressed block by parts. And you can specify desired buffer size. 
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    95
   So memory requirements can be reduced. But decompressing speed will 
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    96
   be 5-10% lower and code size is slightly larger.
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    97
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    98
   
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    99
Memory allocation
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   100
~~~~~~~~~~~~~~~~~
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   101
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   102
7z Decoder uses two memory pools:
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   103
1) Temporary pool
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   104
2) Main pool
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   105
Such scheme can allow you to avoid fragmentation of allocated blocks.
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   106
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   107
Steps for using 7z decoder
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   108
--------------------------
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   109
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   110
Use code at 7zMain.c as example.
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   111
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   112
1) Declare variables:
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   113
  inStream                     /* implements ISzInStream interface */
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   114
  CArchiveDatabaseEx db;       /* 7z archive database structure */
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   115
  ISzAlloc allocImp;           /* memory functions for main pool */
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   116
  ISzAlloc allocTempImp;       /* memory functions for temporary pool */
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   117
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   118
2) call InitCrcTable(); function to initialize CRC structures.
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   119
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   120
3) call SzArDbExInit(&db); function to initialize db structures.
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   121
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   122
4) call SzArchiveOpen(inStream, &db, &allocMain, &allocTemp) to open archive
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   123
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   124
This function opens archive "inStream" and reads headers to "db".
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   125
All items in "db" will be allocated with "allocMain" functions.
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   126
SzArchiveOpen function allocates and frees temporary structures by "allocTemp" functions.
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   127
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   128
5) List items or Extract items
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   129
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   130
  Listing code:
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   131
  ~~~~~~~~~~~~~
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   132
    {
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   133
      UInt32 i;
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   134
      for (i = 0; i < db.Database.NumFiles; i++)
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   135
      {
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   136
        CFileItem *f = db.Database.Files + i;
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   137
        printf("%10d  %s\n", (int)f->Size, f->Name);
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   138
      }
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   139
    }
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   140
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   141
  Extracting code:
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   142
  ~~~~~~~~~~~~~~~~
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   143
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   144
  SZ_RESULT SzExtract(
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   145
    ISzInStream *inStream, 
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   146
    CArchiveDatabaseEx *db,
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   147
    UInt32 fileIndex,         /* index of file */
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   148
    UInt32 *blockIndex,       /* index of solid block */
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   149
    Byte **outBuffer,         /* pointer to pointer to output buffer (allocated with allocMain) */
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   150
    size_t *outBufferSize,    /* buffer size for output buffer */
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   151
    size_t *offset,           /* offset of stream for required file in *outBuffer */
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   152
    size_t *outSizeProcessed, /* size of file in *outBuffer */
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   153
    ISzAlloc *allocMain,
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   154
    ISzAlloc *allocTemp);
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   155
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   156
  If you need to decompress more than one file, you can send these values from previous call:
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   157
    blockIndex, 
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   158
    outBuffer, 
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   159
    outBufferSize,
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   160
  You can consider "outBuffer" as cache of solid block. If your archive is solid, 
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   161
  it will increase decompression speed.
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   162
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   163
  After decompressing you must free "outBuffer":
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   164
  allocImp.Free(outBuffer);
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   165
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   166
6) call SzArDbExFree(&db, allocImp.Free) to free allocated items in "db".
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   167
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   168
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   169
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   170
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   171
Memory requirements for .7z decoding 
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------------------------------------
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   173
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   174
Memory usage for Archive opening:
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   175
  - Temporary pool:
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   176
     - Memory for compressed .7z headers (if _LZMA_IN_CB is not defined)
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   177
     - Memory for uncompressed .7z headers
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   178
     - some other temporary blocks
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   179
  - Main pool:
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   180
     - Memory for database: 
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   181
       Estimated size of one file structures in solid archive:
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         - Size (4 or 8 Bytes)
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   183
         - CRC32 (4 bytes)
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   184
         - LastWriteTime (8 bytes)
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   185
         - Some file information (4 bytes)
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   186
         - File Name (variable length) + pointer + allocation structures
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   187
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   188
Memory usage for archive Decompressing:
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   189
  - Temporary pool:
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   190
     - Memory for compressed solid block (if _LZMA_IN_CB is not defined)
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   191
     - Memory for LZMA decompressing structures
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   192
  - Main pool:
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   193
     - Memory for decompressed solid block
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   194
     - Memory for temprorary buffers, if BCJ2 fileter is used. Usually these 
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   195
       temprorary buffers can be about 15% of solid block size. 
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   196
  
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   197
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   198
If _LZMA_IN_CB is defined, 7z Decoder will not allocate memory for 
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   199
compressed blocks. Instead of this, you must allocate buffer with desired 
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   200
size before calling 7z Decoder. Use 7zMain.c as example.
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   201
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   202
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   203
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   204
EXIT codes
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   205
-----------
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   206
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   207
7z Decoder functions can return one of the following codes:
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   208
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   209
#define SZ_OK (0)
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   210
#define SZE_DATA_ERROR (1)
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   211
#define SZE_OUTOFMEMORY (2)
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   212
#define SZE_CRC_ERROR (3)
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   213
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   214
#define SZE_NOTIMPL (4)
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   215
#define SZE_FAIL (5)
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   216
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   217
#define SZE_ARCHIVE_ERROR (6)
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   218
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   219
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   220
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   221
LZMA Defines
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   222
------------
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   223
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   224
_LZMA_IN_CB       - Use special callback mode for input stream to reduce memory requirements
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   225
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   226
_SZ_FILE_SIZE_32  - define it if you need only support for files smaller than 4 GB
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   227
_SZ_NO_INT_64     - define it if your compiler doesn't support long long int or __int64.
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   228
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   229
_LZMA_PROB32      - it can increase LZMA decompressing speed on some 32-bit CPUs.
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   230
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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   231
_SZ_ALLOC_DEBUG   - define it if you want to debug alloc/free operations to stderr.
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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---
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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http://www.7-zip.org
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
parents:
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http://www.7-zip.org/support.html