From ad0cfd6bd94f9fe44ca86a8019cdf6fea72a6c8b Mon Sep 17 00:00:00 2001
From: lionsoul2014 <chenxin619315@gmail.com>
Date: Tue, 27 Jan 2026 18:56:04 +0800
Subject: [PATCH] pack the ftell & fseek for later large file supports

---
 binding/c/xdb_api.h  |  9 +++++++++
 binding/c/xdb_util.c | 35 +++++++++++++++++++++++++++++++----
 2 files changed, 40 insertions(+), 4 deletions(-)

diff --git a/binding/c/xdb_api.h b/binding/c/xdb_api.h
index b58e6a2..7c785d1 100644
--- a/binding/c/xdb_api.h
+++ b/binding/c/xdb_api.h
@@ -9,6 +9,10 @@
 #ifndef C_IP2REGION_XDB_H
 #define C_IP2REGION_XDB_H
 
+// @Note: 
+// this define must be put before any header include
+// force the LFS for ftell
+#define _FILE_OFFSET_BITS 64
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -201,6 +205,11 @@ XDB_PUBLIC(int) xdb_v6_ip_to_string(const bytes_ip_t *, char *, size_t);
 // returns: -1 if ip1 < ip2, 1 if ip1 > ip2 or 0
 XDB_PUBLIC(int) xdb_ip_sub_compare(const bytes_ip_t *, int, const char *, int);
 
+// large file seek and tell
+XDB_PUBLIC(int) xdb_fseek(FILE *, long long, int);
+
+XDB_PUBLIC(long long) xdb_ftell(FILE *);
+
 // --- END xdb utils
 
 
diff --git a/binding/c/xdb_util.c b/binding/c/xdb_util.c
index 14bd5c0..05ec2ad 100644
--- a/binding/c/xdb_util.c
+++ b/binding/c/xdb_util.c
@@ -228,7 +228,7 @@ XDB_PUBLIC(void) xdb_free_content(void *ptr) {
 }
 
 XDB_PUBLIC(int) xdb_verify_from_header(FILE *handle, xdb_header_t *header) {
-    int runtime_ptr_bytes = 0;  // runtime ptr bytes
+    unsigned int runtime_ptr_bytes = 0;  // runtime ptr bytes
     if (header->version == xdb_structure_20) {
         runtime_ptr_bytes = 4;
     } else if (header->version == xdb_structure_30) {
@@ -244,9 +244,9 @@ XDB_PUBLIC(int) xdb_verify_from_header(FILE *handle, xdb_header_t *header) {
         return 3;
     }
 
-    long int fileBytes = ftell(handle);
-    long int maxFilePtr = (1L << (runtime_ptr_bytes * 8)) - 1;
-    // printf("fileBytes: %ld, maxFilePtr: %ld\n", fileBytes, maxFilePtr);
+    long long fileBytes = xdb_ftell(handle);
+    long long maxFilePtr = (1LL << (runtime_ptr_bytes * 8)) - 1;
+    // printf("fileBytes: %lld, maxFilePtr: %lld\n", fileBytes, maxFilePtr);
     if (fileBytes > maxFilePtr) {
         return 4;
     }
@@ -496,3 +496,30 @@ XDB_PUBLIC(int) xdb_ip_sub_compare(const bytes_ip_t *ip1, int bytes, const char
     }
     return 0;
 }
+
+XDB_PUBLIC(int) xdb_fseek(FILE *handle, long long offset, int whence) {
+    // we may have to use the large file solution later
+    // #if defined(XDB_LINUX)
+    //     return fseeko(handle, (off_t) offset, whence);
+    // #elif defined(XDB_WINDOWS)
+    //     return _fseeki64(handle, (__int64) offset, whence)
+    // #else
+    //     return fseek(handle, (long) offset, whence);
+    // #endif
+
+    return fseek(handle, (long) offset, whence);
+}
+
+XDB_PUBLIC(long long) xdb_ftell(FILE *handle) {
+    // we may have to use the large file solution later
+    // #if defined(XDB_LINUX)
+    //     return (long long) ftello(handle);
+    // #elif defined(XDB_WINDOWS)
+    //     return (long long) _ftelli64(handle);
+    // #else
+    //     // report error ?
+    //     return (long long) ftell(handle);
+    // #endif
+
+    return (long long) ftell(handle);
+}
\ No newline at end of file