From 304c898a3a9ebf703ed26567db39a58d4d487184 Mon Sep 17 00:00:00 2001
From: ziyue <1213642868@qq.com>
Date: Wed, 16 Feb 2022 16:58:13 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AE=8C=E5=96=84http=E6=96=87=E4=BB=B6?=
 =?UTF-8?q?=E8=8E=B7=E5=8F=96=E7=9B=B8=E5=85=B3=E4=BB=A3=E7=A0=81?=
MIME-Version: 1.0
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---
 src/Http/HttpBody.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Http/HttpBody.cpp b/src/Http/HttpBody.cpp
index 63e632eb..19e41e26 100644
--- a/src/Http/HttpBody.cpp
+++ b/src/Http/HttpBody.cpp
@@ -140,6 +140,7 @@ HttpFileBody::HttpFileBody(const string &file_path, bool use_mmap) {
     }
 #endif
     if (!_map_addr && _read_to != -1) {
+        //mmap失败(且不是由于文件不存在导致的)或未执行mmap时，才进入fread逻辑分支
         _fp.reset(fopen(file_path.data(), "rb"), [](FILE *fp) {
             if (fp) {
                 fclose(fp);
@@ -150,7 +151,11 @@ HttpFileBody::HttpFileBody(const string &file_path, bool use_mmap) {
             _read_to = -1;
             return;
         }
-        _read_to = File::fileSize(_fp.get());
+        if (!_read_to) {
+            //_read_to等于0时，说明还未尝试获取文件大小
+            //加上该判断逻辑，在mmap失败时，可以省去一次该操作
+            _read_to = File::fileSize(_fp.get());
+        }
     }
 }