diff -r ea891871f481 -r bb5522e88ab2 misc/libphysfs/lzma/C/Archive/7z/7zExtract.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/C/Archive/7z/7zExtract.c	Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,119 @@
+/* 7zExtract.c */
+
+#include "7zExtract.h"
+#include "7zDecode.h"
+#include "../../7zCrc.h"
+
+SZ_RESULT SzExtract(
+    ISzInStream *inStream, 
+    CArchiveDatabaseEx *db,
+    UInt32 fileIndex,
+    UInt32 *blockIndex,
+    Byte **outBuffer, 
+    size_t *outBufferSize,
+    size_t *offset, 
+    size_t *outSizeProcessed, 
+    ISzAlloc *allocMain,
+    ISzAlloc *allocTemp)
+{
+  UInt32 folderIndex = db->FileIndexToFolderIndexMap[fileIndex];
+  SZ_RESULT res = SZ_OK;
+  *offset = 0;
+  *outSizeProcessed = 0;
+  if (folderIndex == (UInt32)-1)
+  {
+    allocMain->Free(*outBuffer);
+    *blockIndex = folderIndex;
+    *outBuffer = 0;
+    *outBufferSize = 0;
+    return SZ_OK;
+  }
+
+  if (*outBuffer == 0 || *blockIndex != folderIndex)
+  {
+    CFolder *folder = db->Database.Folders + folderIndex;
+    CFileSize unPackSizeSpec = SzFolderGetUnPackSize(folder);
+    size_t unPackSize = (size_t)unPackSizeSpec;
+    CFileSize startOffset = SzArDbGetFolderStreamPos(db, folderIndex, 0);
+    #ifndef _LZMA_IN_CB
+    Byte *inBuffer = 0;
+    size_t processedSize;
+    CFileSize packSizeSpec;
+    size_t packSize;
+    RINOK(SzArDbGetFolderFullPackSize(db, folderIndex, &packSizeSpec));
+    packSize = (size_t)packSizeSpec;
+    if (packSize != packSizeSpec)
+      return SZE_OUTOFMEMORY;
+    #endif
+    if (unPackSize != unPackSizeSpec)
+      return SZE_OUTOFMEMORY;
+    *blockIndex = folderIndex;
+    allocMain->Free(*outBuffer);
+    *outBuffer = 0;
+    
+    RINOK(inStream->Seek(inStream, startOffset));
+    
+    #ifndef _LZMA_IN_CB
+    if (packSize != 0)
+    {
+      inBuffer = (Byte *)allocTemp->Alloc(packSize);
+      if (inBuffer == 0)
+        return SZE_OUTOFMEMORY;
+    }
+    res = inStream->Read(inStream, inBuffer, packSize, &processedSize);
+    if (res == SZ_OK && processedSize != packSize)
+      res = SZE_FAIL;
+    #endif
+    if (res == SZ_OK)
+    {
+      *outBufferSize = unPackSize;
+      if (unPackSize != 0)
+      {
+        *outBuffer = (Byte *)allocMain->Alloc(unPackSize);
+        if (*outBuffer == 0)
+          res = SZE_OUTOFMEMORY;
+      }
+      if (res == SZ_OK)
+      {
+        res = SzDecode(db->Database.PackSizes + 
+          db->FolderStartPackStreamIndex[folderIndex], folder, 
+          #ifdef _LZMA_IN_CB
+          inStream, startOffset, 
+          #else
+          inBuffer, 
+          #endif
+          *outBuffer, unPackSize, allocTemp);
+        if (res == SZ_OK)
+        {
+          if (folder->UnPackCRCDefined)
+          {
+            if (CrcCalc(*outBuffer, unPackSize) != folder->UnPackCRC)
+              res = SZE_CRC_ERROR;
+          }
+        }
+      }
+    }
+    #ifndef _LZMA_IN_CB
+    allocTemp->Free(inBuffer);
+    #endif
+  }
+  if (res == SZ_OK)
+  {
+    UInt32 i; 
+    CFileItem *fileItem = db->Database.Files + fileIndex;
+    *offset = 0;
+    for(i = db->FolderStartFileIndex[folderIndex]; i < fileIndex; i++)
+      *offset += (UInt32)db->Database.Files[i].Size;
+    *outSizeProcessed = (size_t)fileItem->Size;
+    if (*offset + *outSizeProcessed > *outBufferSize)
+      return SZE_FAIL;
+    {
+      if (fileItem->IsFileCRCDefined)
+      {
+        if (CrcCalc(*outBuffer + *offset, *outSizeProcessed) != fileItem->FileCRC)
+          res = SZE_CRC_ERROR;
+      }
+    }
+  }
+  return res;
+}