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pack the ftell & fseek for later large file supports

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lionsoul2014 2026-01-27 18:56:04 +08:00
parent 0cf4cf8e26
commit ad0cfd6bd9
2 changed files with 40 additions and 4 deletions
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9
binding/c/xdb_api.h
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@ -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

35
binding/c/xdb_util.c
View File

@ -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);
}