1 files changed, 135 insertions, 0 deletions
diff --git a/src-diclib/filemap.c b/src-diclib/filemap.c
new file mode 100644
index 0000000..7b3317d
--- /dev/null
+++ b/src-diclib/filemap.c
@@ -0,0 +1,135 @@
+/* mmapを抽象化する
+ *
+ * *Unix系のシステムコールをソース中に散らさないため
+ * *将来的には一つのファイルを複数の目的にmapすることも考慮
+ *
+ * Copyright (C) 2005 TABATA Yusuke
+ *
+ */
+/*
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ */
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+
+#include <anthy/filemap.h>
+#include <anthy/logger.h>
+
+struct filemapping {
+  /* 書き込みモード */
+  int wr;
+  /* mmapしたアドレス */
+  void *ptr;
+  /* mmapした領域の長さ */
+  size_t size;
+};
+
+struct filemapping *
+anthy_mmap(const char *fn, int wr)
+{
+  int fd;
+  void *ptr;
+  int r;
+  struct filemapping *m;
+  struct stat st;
+  int prot;
+  int flags;
+  mode_t mode;
+
+  if (wr) {
+    prot = PROT_READ | PROT_WRITE;
+    flags = O_RDWR;
+    mode = S_IRUSR | S_IWUSR;
+  } else {
+    prot = PROT_READ;
+    flags = O_RDONLY;
+    mode = S_IRUSR;
+  }
+
+  fd = open(fn, flags, mode);
+
+  if (fd == -1) {
+    anthy_log(0, "Failed to open (%s).\n", fn);
+    return NULL;
+  }
+
+  r = fstat(fd, &st);
+  if (r == -1) {
+    anthy_log(0, "Failed to stat() (%s).\n", fn);
+    close(fd);
+    return NULL;
+  }
+  if (st.st_size == 0) {
+    anthy_log(0, "Failed to mmap 0size file (%s).\n", fn);
+    close(fd);
+    return NULL;
+  }
+
+  ptr = mmap(NULL, st.st_size, prot, MAP_SHARED, fd, 0);
+  close(fd);
+  if (ptr == MAP_FAILED) {
+    anthy_log(0, "Failed to mmap() (%s).\n", fn);
+    return NULL;
+  }
+
+  /* mmapに成功したので情報を返す */
+  m = malloc(sizeof(struct filemapping));
+  m->size = st.st_size;
+  m->ptr = ptr;
+  m->wr = wr;
+
+  return m;
+}
+
+void *
+anthy_mmap_address(struct filemapping *m)
+{
+  if (!m) {
+    return NULL;
+  }
+  return m->ptr;
+}
+
+int
+anthy_mmap_size(struct filemapping *m)
+{
+  if (!m) {
+    return 0;
+  }
+  return m->size;
+}
+
+int
+anthy_mmap_is_writable(struct filemapping *m)
+{
+  if (!m) {
+    return 0;
+  }
+  return m->wr;
+}
+
+void
+anthy_munmap(struct filemapping *m)
+{
+  if (!m) {
+    return ;
+  }
+  munmap(m->ptr, m->size);
+  free(m);
+}