//
//  XCForwarder.m
//  SAGESSE
//
//  Created by SAGESSE on 2019/4/30.
//

#import <Foundation/Foundation.h>

/// Declare the initialization method forward.
@interface NSObject (XCForwarder)
+(void*)XCForwarderInit;
@end

/// Init the Forwarder.
static void* forwarder = nil;
__attribute__((constructor)) void XCForwarderInit() {
    
    // printf("%s\n", __func__);
    if ([NSObject respondsToSelector:@selector(XCForwarderInit)]) {
        forwarder = [NSObject XCForwarderInit];
    }
}

/// Load the file from the Forwarder.
unsigned char* XCForwarderLoadData(const char* name, const char* mode, size_t* osize) {
    
    // printf("%s %s - %s\n", __func__, name, mode);
    if (forwarder != nil) {
        return ((__typeof(&XCForwarderLoadData))forwarder)(name, mode, osize);
    }
    
    FILE* fp = fopen(name, mode);
    
    if (fp == nil) {
        *osize = 0;
        return nil;
    }
    
    fseek(fp,0,SEEK_END);
    ssize_t size = ftell(fp);
    fseek(fp,0,SEEK_SET);
    
    unsigned char* buffer = malloc(size + 1);
    size_t readed = fread(buffer, 1, size, fp);
    
    if (readed >= 0) {
        buffer[readed] = '\0';
    }
    
    *osize = readed;
    fclose(fp);
    return buffer;
}