From 84d5acf53ab5d40e7caef6bb4ff6969dfc8b3dae Mon Sep 17 00:00:00 2001
From: Joe Orton <jorton@apache.org>
Date: Mon, 12 Mar 2007 15:05:50 +0000
Subject: [PATCH] Generate etags consistently across 32-bit and 64-bit
 platforms:

* modules/http/http_etag.c (etag_uint64_to_hex): Renamed from
etag_ulong_to_hex; take an apr_uint64_t argument.
(ap_make_etag): Adjust to use new function and macro names.
Pass arguments directly to etag_uint64_to_hex without casting
down to unsigned long.

PR: 40064


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@517238 13f79535-47bb-0310-9956-ffa450edef68
---
 CHANGES                  |  3 +++
 modules/http/http_etag.c | 24 ++++++++++++------------
 2 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/CHANGES b/CHANGES
index bd4bd1cb6f..accfc12997 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2,6 +2,9 @@
 Changes with Apache 2.3.0
   [Remove entries to the current 2.0 and 2.2 section below, when backported]
 
+  *) core: Change etag generation to produce identical results on 
+     32-bit and 64-bit platforms.  PR 40064.  [Joe Orton]
+
   *) ab: Add -r option to continue after socket receive errors. 
      [Filip Hanik <devlist hanik.com>]
 
diff --git a/modules/http/http_etag.c b/modules/http/http_etag.c
index c2dd88138a..1ebdcb709b 100644
--- a/modules/http/http_etag.c
+++ b/modules/http/http_etag.c
@@ -28,16 +28,16 @@
 #include "http_protocol.h"   /* For index_of_response().  Grump. */
 #include "http_request.h"
 
-/* Generate the human-readable hex representation of an unsigned long
- * (basically a faster version of 'sprintf("%lx")')
+/* Generate the human-readable hex representation of an apr_uint64_t
+ * (basically a faster version of 'sprintf("%llx")')
  */
 #define HEX_DIGITS "0123456789abcdef"
-static char *etag_ulong_to_hex(char *next, unsigned long u)
+static char *etag_uint64_to_hex(char *next, apr_uint64_t u)
 {
     int printing = 0;
     int shift = sizeof(unsigned long) * 8 - 4;
     do {
-        unsigned long next_digit = ((u >> shift) & (unsigned long)0xf);
+        unsigned short next_digit = ((u >> shift) & (apr_uint64_t)0xf);
         if (next_digit) {
             *next++ = HEX_DIGITS[next_digit];
             printing = 1;
@@ -47,12 +47,12 @@ static char *etag_ulong_to_hex(char *next, unsigned long u)
         }
         shift -= 4;
     } while (shift);
-    *next++ = HEX_DIGITS[u & (unsigned long)0xf];
+    *next++ = HEX_DIGITS[u & (apr_uint64_t)0xf];
     return next;
 }
 
 #define ETAG_WEAK "W/"
-#define CHARS_PER_UNSIGNED_LONG (sizeof(unsigned long) * 2)
+#define CHARS_PER_UINT64 (sizeof(apr_uint64_t) * 2)
 /*
  * Construct an entity tag (ETag) from resource information.  If it's a real
  * file, build in some of the file characteristics.  If the modification time
@@ -115,7 +115,7 @@ AP_DECLARE(char *) ap_make_etag(request_rec *r, int force_weak)
          * FileETag keywords.
          */
         etag = apr_palloc(r->pool, weak_len + sizeof("\"--\"") +
-                          3 * CHARS_PER_UNSIGNED_LONG + 1);
+                          3 * CHARS_PER_UINT64 + 1);
         next = etag;
         if (weak) {
             while (*weak) {
@@ -125,21 +125,21 @@ AP_DECLARE(char *) ap_make_etag(request_rec *r, int force_weak)
         *next++ = '"';
         bits_added = 0;
         if (etag_bits & ETAG_INODE) {
-            next = etag_ulong_to_hex(next, (unsigned long)r->finfo.inode);
+            next = etag_uint64_to_hex(next, r->finfo.inode);
             bits_added |= ETAG_INODE;
         }
         if (etag_bits & ETAG_SIZE) {
             if (bits_added != 0) {
                 *next++ = '-';
             }
-            next = etag_ulong_to_hex(next, (unsigned long)r->finfo.size);
+            next = etag_uint64_to_hex(next, r->finfo.size);
             bits_added |= ETAG_SIZE;
         }
         if (etag_bits & ETAG_MTIME) {
             if (bits_added != 0) {
                 *next++ = '-';
             }
-            next = etag_ulong_to_hex(next, (unsigned long)r->mtime);
+            next = etag_uint64_to_hex(next, r->mtime);
         }
         *next++ = '"';
         *next = '\0';
@@ -149,7 +149,7 @@ AP_DECLARE(char *) ap_make_etag(request_rec *r, int force_weak)
          * Not a file document, so just use the mtime: [W/]"mtime"
          */
         etag = apr_palloc(r->pool, weak_len + sizeof("\"\"") +
-                          CHARS_PER_UNSIGNED_LONG + 1);
+                          CHARS_PER_UINT64 + 1);
         next = etag;
         if (weak) {
             while (*weak) {
@@ -157,7 +157,7 @@ AP_DECLARE(char *) ap_make_etag(request_rec *r, int force_weak)
             }
         }
         *next++ = '"';
-        next = etag_ulong_to_hex(next, (unsigned long)r->mtime);
+        next = etag_uint64_to_hex(next, r->mtime);
         *next++ = '"';
         *next = '\0';
     }
-- 
2.50.1