service_runtime/gio_mem_snapshot.c

   1 /*
   2  * Copyright 2008, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * NaCl Generic I/O interface implementation: in-memory snapshot of a file.
  34  */
  35
  36 #include "native_client/include/portability.h"
  37 #include <stdio.h>
  38 #include <sys/stat.h>
  39 #include <stdlib.h>
  40
  41 #include "native_client/service_runtime/gio.h"
  42
  43 struct GioVtbl const  kGioMemoryFileSnapshotVtbl = {
  44   GioMemoryFileRead,
  45   GioMemoryFileWrite,
  46   GioMemoryFileSeek,
  47   GioMemoryFileFlush,
  48   GioMemoryFileClose,
  49   GioMemoryFileSnapshotDtor,
  50 };
  51
  52 int   GioMemoryFileSnapshotCtor(struct GioMemoryFileSnapshot  *self,
  53                                 char                          *fn)
  54 {
  55   FILE            *iop;
  56   struct stat     stbuf;
  57   char            *buffer;
  58
  59   if (0 == (iop = fopen(fn, "rb"))) {
  60     return 0;
  61   }
  62   if (fstat(fileno(iop), &stbuf) == -1) {
  63  abort0:
  64     fclose(iop);
  65     return 0;
  66   }
  67   if (0 == (buffer = malloc(stbuf.st_size))) {
  68     goto abort0;
  69   }
  70   if (fread(buffer, 1, stbuf.st_size, iop) != (size_t) stbuf.st_size) {
  71  abort1:
  72     free(buffer);
  73     goto abort0;
  74   }
  75   if (GioMemoryFileCtor(&self->base, buffer, stbuf.st_size) == 0) {
  76     goto abort1;
  77   }
  78   (void) fclose(iop);
  79   ((struct Gio *) self)->vtbl = &kGioMemoryFileSnapshotVtbl;
  80   return 1;
  81 }
  82
  83
  84 void GioMemoryFileSnapshotDtor(struct Gio                     *vself)
  85 {
  86   struct GioMemoryFileSnapshot  *self = (struct GioMemoryFileSnapshot *)
  87       vself;
  88   free(self->base.buffer);
  89   GioMemoryFileDtor(vself);
  90 }