From c6702c7d3f53b0eb07e452c732df1b8f5765b287 Mon Sep 17 00:00:00 2001
From: Yang Tse <yangsita@gmail.com>
Date: Sat, 24 Sep 2011 17:38:16 +0200
Subject: curl tool: reviewed code moved to tool_*.[ch] files

---
 src/tool_cb_see.c | 129 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 src/tool_cb_see.c

(limited to 'src/tool_cb_see.c')

diff --git a/src/tool_cb_see.c b/src/tool_cb_see.c
new file mode 100644
index 000000000..5bac4947b
--- /dev/null
+++ b/src/tool_cb_see.c
@@ -0,0 +1,129 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+#include "setup.h"
+
+#include <curl/curl.h>
+
+#ifdef HAVE_UNISTD_H
+#  include <unistd.h>
+#endif
+
+#define ENABLE_CURLX_PRINTF
+/* use our own printf() functions */
+#include "curlx.h"
+
+#include "tool_cfgable.h"
+#include "tool_cb_see.h"
+
+#include "memdebug.h" /* keep this as LAST include */
+
+/* OUR_MAX_SEEK_L has 'long' data type, OUR_MAX_SEEK_O has 'curl_off_t,
+   both represent the same value. Maximum offset used here when we lseek
+   using a 'long' data type offset */
+
+#define OUR_MAX_SEEK_L  2147483647L - 1L
+#define OUR_MAX_SEEK_O  CURL_OFF_T_C(0x7FFFFFFF) - CURL_OFF_T_C(0x1)
+
+/*
+** callback for CURLOPT_SEEKFUNCTION
+**
+** Notice that this is not supposed to return the resulting offset. This
+** shall only return CURL_SEEKFUNC_* return codes.
+*/
+
+int tool_seek_cb(void *userdata, curl_off_t offset, int whence)
+{
+  struct InStruct *in = userdata;
+
+#if(CURL_SIZEOF_CURL_OFF_T > SIZEOF_OFF_T) && !defined(USE_WIN32_LARGE_FILES)
+
+  /* The offset check following here is only interesting if curl_off_t is
+     larger than off_t and we are not using the WIN32 large file support
+     macros that provide the support to do 64bit seeks correctly */
+
+  if(offset > OUR_MAX_SEEK_O) {
+    /* Some precaution code to work around problems with different data sizes
+       to allow seeking >32bit even if off_t is 32bit. Should be very rare and
+       is really valid on weirdo-systems. */
+    curl_off_t left = offset;
+
+    if(whence != SEEK_SET)
+      /* this code path doesn't support other types */
+      return CURL_SEEKFUNC_FAIL;
+
+    if(LSEEK_ERROR == lseek(in->fd, 0, SEEK_SET))
+      /* couldn't rewind to beginning */
+      return CURL_SEEKFUNC_FAIL;
+
+    while(left) {
+      long step = (left > OUR_MAX_SEEK_O) ? OUR_MAX_SEEK_L : (long)left;
+      if(LSEEK_ERROR == lseek(in->fd, step, SEEK_CUR))
+        /* couldn't seek forwards the desired amount */
+        return CURL_SEEKFUNC_FAIL;
+      left -= step;
+    }
+    return CURL_SEEKFUNC_OK;
+  }
+#endif
+
+  if(LSEEK_ERROR == lseek(in->fd, offset, whence))
+    /* couldn't rewind, the reason is in errno but errno is just not portable
+       enough and we don't actually care that much why we failed. We'll let
+       libcurl know that it may try other means if it wants to. */
+    return CURL_SEEKFUNC_CANTSEEK;
+
+  return CURL_SEEKFUNC_OK;
+}
+
+#if defined(WIN32) && !defined(__MINGW64__)
+
+#ifdef __BORLANDC__
+/* 64-bit lseek-like function unavailable */
+#  define _lseeki64(hnd,ofs,whence) lseek(hnd,ofs,whence)
+#endif
+
+#ifdef __POCC__
+#  if(__POCC__ < 450)
+/* 64-bit lseek-like function unavailable */
+#    define _lseeki64(hnd,ofs,whence) _lseek(hnd,ofs,whence)
+#  else
+#    define _lseeki64(hnd,ofs,whence) _lseek64(hnd,ofs,whence)
+#  endif
+#endif
+
+/*
+ * Truncate a file handle at a 64-bit position 'where'.
+ */
+
+int tool_ftruncate64(int fd, curl_off_t where)
+{
+  if(_lseeki64(fd, where, SEEK_SET) < 0)
+    return -1;
+
+  if(!SetEndOfFile((HANDLE)_get_osfhandle(fd)))
+    return -1;
+
+  return 0;
+}
+
+#endif /* WIN32  && ! __MINGW64__ */
+
-- 
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