1 files changed, 83 insertions, 0 deletions
diff --git a/zip.c b/zip.c
new file mode 100644
index 0000000..f54278a
--- /dev/null
+++ b/zip.c
@@ -0,0 +1,83 @@
+#include "project.h"
+
+void
+fatal_zip (struct zip *zip)
+{
+  fprintf (stderr, "zip error: %s\n", zip_strerror (zip));
+  exit (EXIT_FAILURE);
+}
+
+
+
+
+
+struct zip *
+open_zip (const char *fn)
+{
+  struct zip *ret;
+  int fd;
+  int error;
+
+
+  fd = open (fn, O_RDONLY);
+  if (fd < 0)
+    {
+      perror ("open");
+      exit (EXIT_FAILURE);
+    }
+
+  ret = zip_fdopen (fd, 0, &error);
+
+  if (!ret)
+    {
+      fprintf (stderr, "filed to open zip file %s: %d\n", fn, error);
+      exit (EXIT_FAILURE);
+    }
+
+  return ret;
+}
+
+
+size_t
+read_file_from_zip (struct zip * zip, const char *fn, void *_buf)
+{
+  struct zip_file *f;
+  size_t size = 0, buf_sz = 1024;
+  ssize_t red;
+  uint8_t *buf;
+
+  f = zip_fopen (zip, fn, 0);
+
+  if (!f)
+    fatal_zip (zip);
+
+  buf = xmalloc (buf_sz + 1);
+
+  for (;;)
+    {
+
+      red = zip_fread (f, buf + size, buf_sz - size);
+
+      if (red < 0)
+        fatal_zip (zip);
+
+      if (!red)
+        break;
+
+      size += red;
+      if (size == buf_sz)
+        {
+          buf_sz <<= 1;
+          buf = xrealloc (buf, buf_sz);
+        }
+
+    }
+
+  buf[size] = 0;
+
+  zip_fclose (f);
+
+  *(void **) _buf = (void *) buf;
+
+  return size;
+}