[PATCH] http: parse HTTP headers case-insensitive

[Jamo <jamofer@gmail.com>]

According to https://www.ietf.org/rfc/rfc2616.txt 4.2, header names
shall be case insensitive and we are now forced to read headers like
`Content-Length` capitalized.

The problem with that is when a HTTP server responds with a
`content-length` header in lowercase GRUB gets stuck because HTTP
module doesn't know the length of the transmision and the call never
ends.
---
 grub-core/net/http.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/grub-core/net/http.c b/grub-core/net/http.c
index b616cf40b..d3ba8c799 100644
--- a/grub-core/net/http.c
+++ b/grub-core/net/http.c
@@ -130,7 +130,7 @@ parse_line (grub_file_t file, http_data_t data, char *ptr, grub_size_t len)
       data->first_line_recv = 1;
       return GRUB_ERR_NONE;
     }
-  if (grub_memcmp (ptr, "Content-Length: ", sizeof ("Content-Length: ") - 1)
+  if (grub_strncasecmp (ptr, "Content-Length: ", sizeof ("Content-Length: ") - 1)
       == 0 && !data->size_recv)
     {
       ptr += sizeof ("Content-Length: ") - 1;
@@ -138,8 +138,8 @@ parse_line (grub_file_t file, http_data_t data, char *ptr, grub_size_t len)
       data->size_recv = 1;
       return GRUB_ERR_NONE;
     }
-  if (grub_memcmp (ptr, "Transfer-Encoding: chunked",
-		   sizeof ("Transfer-Encoding: chunked") - 1) == 0)
+  if (grub_strncasecmp (ptr, "Transfer-Encoding: chunked",
+			sizeof ("Transfer-Encoding: chunked") - 1) == 0)
     {
       data->chunked = 1;
       return GRUB_ERR_NONE;
-- 
2.32.0