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

third_party/lzma/v4_65/files/C/7zBuf2.c

-/* 7zBuf2.c -- Byte Buffer
-2008-10-04 : Igor Pavlov : Public domain */
-
-#include <string.h>
-#include "7zBuf.h"
-
-void DynBuf_Construct(CDynBuf *p)
-{
-  p->data = 0;
-  p->size = 0;
-  p->pos = 0;
-}
-
-void DynBuf_SeekToBeg(CDynBuf *p)
-{
-  p->pos = 0;
-}
-
-int DynBuf_Write(CDynBuf *p, const Byte *buf, size_t size, ISzAlloc *alloc)
-{
-  if (size > p->size - p->pos)
-  {
-    size_t newSize = p->pos + size;
-    Byte *data;
-    newSize += newSize / 4;
-    data = (Byte *)alloc->Alloc(alloc, newSize);
-    if (data == 0)
-      return 0;
-    p->size = newSize;
-    memcpy(data, p->data, p->pos);
-    alloc->Free(alloc, p->data);
-    p->data = data;
-  }
-  memcpy(p->data + p->pos, buf, size);
-  p->pos += size;
-  return 1;
-}
-
-void DynBuf_Free(CDynBuf *p, ISzAlloc *alloc)
-{
-  alloc->Free(alloc, p->data);
-  p->data = 0;
-  p->size = 0;
-  p->pos = 0;
-}