From 9e750b9b0552bb7e072e97a9f29eba7656f77444 Mon Sep 17 00:00:00 2001
From: Fufu Fang <fangfufu@fangfufu.co.uk>
Date: Sun, 17 Nov 2024 23:50:05 +0000
Subject: [PATCH] added the option zero-len-is-dir

---
 src/config.c |  2 ++
 src/config.h |  2 ++
 src/link.c   | 14 ++++++++++----
 src/main.c   |  5 +++++
 4 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/src/config.c b/src/config.c
index af20dbe..dd6adc2 100644
--- a/src/config.c
+++ b/src/config.c
@@ -49,6 +49,8 @@ void Config_init(void)
 
     CONFIG.no_range_check = 0;
 
+    CONFIG.zero_len_is_dir = 0;
+
     CONFIG.insecure_tls = 0;
 
     CONFIG.refresh_timeout = DEFAULT_REFRESH_TIMEOUT;
diff --git a/src/config.h b/src/config.h
index dc7a4e5..f416c63 100644
--- a/src/config.h
+++ b/src/config.h
@@ -65,6 +65,8 @@ typedef struct {
     struct curl_slist *http_headers;
     /** \brief Disable check for the server's support of HTTP range request */
     int no_range_check;
+    /** \brief Treat zero length file as directory */
+    int zero_len_is_dir;
     /** \brief Disable TLS certificate verification */
     int insecure_tls;
     /** \brief Server certificate file */
diff --git a/src/link.c b/src/link.c
index 7a69ceb..e852072 100644
--- a/src/link.c
+++ b/src/link.c
@@ -452,7 +452,12 @@ void Link_set_file_stat(Link *this_link, CURL *curl)
             lprintf(error, "%s", curl_easy_strerror(ret));
         }
         if (cl <= 0) {
-            this_link->type = LINK_INVALID;
+            if (CONFIG.zero_len_is_dir) {
+                this_link->type = LINK_DIR;
+            } else {
+                lprintf(info, "Zero length file: %s\n", this_link->f_url);
+                this_link->type = LINK_INVALID;
+            }
         } else {
             this_link->type = LINK_FILE;
             this_link->content_length = cl;
@@ -1074,7 +1079,7 @@ long Link_download(Link *link, char *output_buf, size_t req_size, off_t offset)
 
     if (offset + req_size > link->content_length) {
         lprintf(info,
-                "requested size too larger than remaining size, req_size: %lu, recv: %ld, content-length: %ld\n",
+                "requested size larger than remaining size, req_size: %lu, recv: %ld, content-length: %ld\n",
                 req_size, recv, link->content_length);
         req_size = link->content_length - offset;
     }
@@ -1088,8 +1093,9 @@ long Link_download(Link *link, char *output_buf, size_t req_size, off_t offset)
     /* The extra 1 byte is probably for '\0' */
     if (recv - 1 == (long int) req_size) {
         recv--;
-    } else if (offset + req_size < link->content_length) {
-        lprintf(error, "req_size: %lu, recv: %ld\n", req_size, recv);
+    } else {
+        lprintf(error, "req_size != recv, req_size: %lu, recv: %ld\n",
+                req_size, recv);
     }
 
     memmove(output_buf, ts.data, recv);
diff --git a/src/main.c b/src/main.c
index 2dde953..bc3fd85 100644
--- a/src/main.c
+++ b/src/main.c
@@ -225,6 +225,7 @@ parse_arg_list(int argc, char **argv, char ***fuse_argv, int *fuse_argc)
         { "refresh-timeout", required_argument, NULL, 'L' },    /* 25 */
         { "http-header", required_argument, NULL, 'L' },        /* 26 */
         { "cache-clear", no_argument, NULL, 'L' },     /* 27 */
+        { "zero-len-is-dir", no_argument, NULL, 'L' }, /* 28 */
         { 0, 0, 0, 0 }
     };
     while ((c =
@@ -339,6 +340,9 @@ parse_arg_list(int argc, char **argv, char ***fuse_argv, int *fuse_argc)
             case 27:
                 CacheSystem_clear();
                 break;
+            case 28:
+                CONFIG.zero_len_is_dir = 1;
+                break;
             default:
                 fprintf(stderr, "see httpdirfs -h for usage\n");
                 return 1;
@@ -416,6 +420,7 @@ HTTPDirFS options:\n\
         --user-agent        Set user agent string (default: \"HTTPDirFS\")\n\
         --no-range-check    Disable the built-in check for the server's support\n\
                             for HTTP range requests\n\
+        --zero-len-is-dir   If a file has a zero length, treat it as a directory\n\
         --insecure-tls      Disable licurl TLS certificate verification by\n\
                             setting CURLOPT_SSL_VERIFYHOST to 0\n\
         --single-file-mode  Single file mode - rather than mounting a whole\n\