添加图标

AboutForm.cs

@@ -51,7 +51,7 @@ namespace AppStore
 
             // 初始化并添加应用信息
             infoLabel = new Label();
-            infoLabel.Text = "kortapp-z\n版本: 1.3.6\n作者: zs-yg\n一个简单、开源的应用商店\nkortapp-z是完全免费\n基于.NET8和C/C++的软件";
+            infoLabel.Text = "kortapp-z\n版本: 1.3.8\n作者: zs-yg\n一个简单、开源的应用商店\nkortapp-z是完全免费\n基于.NET8和C/C++的软件";
             infoLabel.Font = new Font("Microsoft YaHei", 12);
             infoLabel.AutoSize = false;
             infoLabel.Width = 300;
@@ -125,7 +125,7 @@ namespace AppStore
         }
     }
 
-    // 保留原AboutForm作为容器(可选)
+    // 保留原AboutForm作为容器
     public class AboutForm : Form
     {
         public AboutForm()

DownloadItem.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 using System.Drawing;
 using System.Windows.Forms;
 
@@ -14,6 +15,7 @@ namespace AppStore
         public string FileName { get; set; } = string.Empty;
         public int Progress { get; set; }
         public string Status { get; set; } = string.Empty;
+        public Process? DownloadProcess { get; set; }
 
         public DownloadItem()
         {
@@ -123,9 +125,26 @@ namespace AppStore
 
             try
             {
+                // 1. 先取消下载
                 DownloadManager.Instance.CancelDownload(this);
+                
+                // 2. 更新状态为已取消
                 Status = "已取消";
                 UpdateDisplay();
+                
+                // 3. 延迟100ms后移除控件，确保UI更新完成
+                var timer = new System.Windows.Forms.Timer { Interval = 100 };
+                timer.Tick += (s, args) =>
+                {
+                    timer.Stop();
+                    timer.Dispose();
+                    if (this.Parent != null)
+                    {
+                        this.Parent.Controls.Remove(this);
+                        this.Dispose();
+                    }
+                };
+                timer.Start();
             }
             catch (Exception ex)
             {

README.md

@@ -83,7 +83,9 @@ Copyright (c) 2025 zsyg
 
 ## 其他网站
 
-gitee镜像仓库:https://gitee.com/chr_super/kortapp-z  (目前已经停止维护)
+gitee镜像仓库:https://gitee.com/chr_super/kortapp-z  (目前已经停止维护,仅镜像代码)
+
+sourceforge镜像仓库:https://sourceforge.net/projects/kortapp-z/ （提供releases镜像）
 
 ## 维护
 

inno/innosetup_x64.iss

@@ -2,7 +2,7 @@
 ; 有关创建 Inno Setup 脚本文件的详细信息,请参阅帮助文档！
 
 #define MyAppName "kortapp-z"
-#define MyAppVersion "1.3.6"
+#define MyAppVersion "1.3.8"
 #define MyAppPublisher "zsyg"
 #define MyAppURL "https://github.com/zs-yg/kortapp-z"
 #define MyAppExeName "kortapp-z.exe"

inno/innosetup_x86.iss

@@ -2,7 +2,7 @@
 ; 有关创建 Inno Setup 脚本文件的详细信息,请参阅帮助文档！
 
 #define MyAppName "kortapp-z"
-#define MyAppVersion "1.3.6"
+#define MyAppVersion "1.3.8"
 #define MyAppPublisher "zsyg"
 #define MyAppURL "https://github.com/zs-yg/kortapp-z"
 #define MyAppExeName "kortapp-z.exe"

others/C/hash_value_extractor/CMakeLists.txt

@@ -0,0 +1,55 @@
+cmake_minimum_required(VERSION 3.10)
+project(hash_value_extractor)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+
+# 静态编译选项
+option(BUILD_STATIC "Build with static linking" ON)
+
+# 查找OpenSSL
+find_package(OpenSSL REQUIRED)
+
+# 设置Windows子系统
+if(WIN32)
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -mwindows")
+    if(BUILD_STATIC)
+        set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static")
+        set(CMAKE_FIND_LIBRARY_SUFFIXES .a)
+        set(CMAKE_EXE_LINK_DYNAMIC_C_FLAGS) 
+        set(CMAKE_EXE_LINK_DYNAMIC_CXX_FLAGS)
+        set(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS)
+        set(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS)
+    endif()
+endif()
+
+# 包含目录
+include_directories(include)
+
+# 添加可执行文件
+add_executable(hash_value_extractor
+    src/main.c
+    src/md5.c
+    src/sha256.c
+    src/sha512.c
+    src/string_util.c
+)
+
+# 链接OpenSSL库
+if(BUILD_STATIC)
+    # 显式指定静态库路径和名称
+    find_library(OPENSSL_SSL_STATIC_LIBRARY NAMES ssl libssl.a PATHS ${OPENSSL_ROOT_DIR}/lib)
+    find_library(OPENSSL_CRYPTO_STATIC_LIBRARY NAMES crypto libcrypto.a PATHS ${OPENSSL_ROOT_DIR}/lib)
+    
+    target_link_libraries(hash_value_extractor 
+        ${OPENSSL_SSL_STATIC_LIBRARY}
+        ${OPENSSL_CRYPTO_STATIC_LIBRARY}
+        -lcrypt32
+        -lws2_32
+    )
+else()
+    target_link_libraries(hash_value_extractor 
+        OpenSSL::SSL 
+        OpenSSL::Crypto
+    )
+endif()

others/C/hash_value_extractor/include/hash_calculator.h

@@ -0,0 +1,37 @@
+#ifndef HASH_CALCULATOR_H
+#define HASH_CALCULATOR_H
+
+#include <stddef.h>
+
+typedef enum {
+    HASH_MD5,
+    HASH_SHA256,
+    HASH_SHA512
+} HashAlgorithm;
+
+// 各算法计算函数
+int calculate_md5(const char* filename, char* output);
+int calculate_sha256(const char* filename, char* output);
+int calculate_sha512(const char* filename, char* output);
+
+/**
+ * 计算文件的哈希值
+ * @param filename 文件路径
+ * @param algorithm 哈希算法
+ * @param output 输出缓冲区(必须足够大)
+ * @return 成功返回0，失败返回-1
+ */
+static inline int calculate_file_hash(const char* filename, HashAlgorithm algorithm, char* output) {
+    switch (algorithm) {
+        case HASH_MD5:
+            return calculate_md5(filename, output);
+        case HASH_SHA256:
+            return calculate_sha256(filename, output);
+        case HASH_SHA512:
+            return calculate_sha512(filename, output);
+        default:
+            return -1;
+    }
+}
+
+#endif // HASH_CALCULATOR_H

others/C/hash_value_extractor/include/string_util.h

@@ -0,0 +1,21 @@
+#ifndef STRING_UTIL_H
+#define STRING_UTIL_H
+
+#include <stddef.h>
+
+// 快速分配字符串内存
+char* str_alloc(size_t size);
+
+// 快速释放字符串内存
+void str_free(char* str);
+
+// 快速字符串复制
+char* str_copy(const char* src);
+
+// 快速字符串连接
+char* str_concat(const char* str1, const char* str2);
+
+// 二进制转十六进制字符串
+char* bin_to_hex(const unsigned char* data, size_t len);
+
+#endif // STRING_UTIL_H

others/C/hash_value_extractor/src/hash_calculator.c

@@ -0,0 +1,53 @@
+#include "hash_calculator.h"
+#include <openssl/md5.h>
+#include <openssl/sha.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int calculate_file_hash(const char* filename, HashAlgorithm algorithm, char* output) {
+    FILE* file = fopen(filename, "rb");
+    if (!file) return -1;
+
+    const EVP_MD* md = NULL;
+    EVP_MD_CTX* mdctx = EVP_MD_CTX_new();
+    unsigned char hash[EVP_MAX_MD_SIZE];
+    unsigned int hash_len = 0;
+
+    switch (algorithm) {
+        case HASH_MD5:
+            md = EVP_md5();
+            break;
+        case HASH_SHA256:
+            md = EVP_sha256();
+            break;
+        case HASH_SHA512:
+            md = EVP_sha512();
+            break;
+        default:
+            fclose(file);
+            return -1;
+    }
+
+    EVP_DigestInit_ex(mdctx, md, NULL);
+
+    unsigned char buffer[1024];
+    size_t bytes_read;
+    while ((bytes_read = fread(buffer, 1, sizeof(buffer), file))) {
+        EVP_DigestUpdate(mdctx, buffer, bytes_read);
+    }
+
+    EVP_DigestFinal_ex(mdctx, hash, &hash_len);
+    EVP_MD_CTX_free(mdctx);
+    fclose(file);
+
+    hash_to_hex(hash, hash_len, output);
+    return 0;
+}
+
+void hash_to_hex(const unsigned char* hash, size_t hash_len, char* output) {
+    for (size_t i = 0; i < hash_len; i++) {
+        sprintf(output + (i * 2), "%02x", hash[i]);
+    }
+    output[hash_len * 2] = '\0';
+}
+</fitten_content>

others/C/hash_value_extractor/src/main.c

@@ -0,0 +1,204 @@
+// 确保使用Unicode字符集
+#define UNICODE
+#define _UNICODE
+
+#include <windows.h>
+#include <commdlg.h>
+#include "hash_calculator.h"
+#include <openssl/evp.h>
+#include <wchar.h>
+
+#define IDC_ALGORITHM_COMBO 1001
+#define IDC_FILE_EDIT 1002
+#define IDC_HASH_EDIT 1003
+#define IDC_BROWSE_BUTTON 1004
+#define IDC_CALCULATE_BUTTON 1005
+#define IDC_COPY_BUTTON 1006
+
+// 中文UI字符串定义
+static const wchar_t* APP_TITLE = L"哈希值提取器";
+static const wchar_t* ALGORITHMS[] = {L"MD5", L"SHA-256", L"SHA-512"};
+static const wchar_t* CALCULATE_BTN = L"计算哈希";
+static const wchar_t* BROWSE_BTN = L"浏览...";
+static const wchar_t* COPY_BTN = L"复制哈希值";
+static const wchar_t* CALC_FAILED = L"计算哈希值失败";
+
+// 全局变量
+HWND g_hAlgorithmCombo, g_hFileEdit, g_hHashEdit;
+
+// 初始化控件
+void InitControls(HWND hWnd) {
+    // 算法选择下拉框
+    g_hAlgorithmCombo = CreateWindowW(L"COMBOBOX", NULL, 
+        WS_CHILD | WS_VISIBLE | CBS_DROPDOWNLIST | WS_VSCROLL,
+        10, 10, 200, 200, hWnd, (HMENU)IDC_ALGORITHM_COMBO, NULL, NULL);
+    
+    // 添加算法选项
+    SendMessageW(g_hAlgorithmCombo, CB_ADDSTRING, 0, (LPARAM)L"MD5");
+    SendMessageW(g_hAlgorithmCombo, CB_ADDSTRING, 0, (LPARAM)L"SHA-256");
+    SendMessageW(g_hAlgorithmCombo, CB_ADDSTRING, 0, (LPARAM)L"SHA-512");
+    SendMessageW(g_hAlgorithmCombo, CB_SETCURSEL, 0, 0);
+    
+    // 文件路径编辑框
+    g_hFileEdit = CreateWindowW(L"EDIT", NULL, 
+        WS_CHILD | WS_VISIBLE | WS_BORDER | ES_AUTOHSCROLL,
+        10, 40, 300, 25, hWnd, (HMENU)IDC_FILE_EDIT, NULL, NULL);
+    
+    // 浏览按钮
+    CreateWindowW(L"BUTTON", L"浏览...", 
+        WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
+        320, 40, 80, 25, hWnd, (HMENU)IDC_BROWSE_BUTTON, NULL, NULL);
+    
+    // 计算按钮
+    CreateWindowW(L"BUTTON", L"计算哈希", 
+        WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
+        10, 75, 100, 30, hWnd, (HMENU)IDC_CALCULATE_BUTTON, NULL, NULL);
+    
+    // 哈希结果显示框
+    g_hHashEdit = CreateWindowW(L"EDIT", NULL, 
+        WS_CHILD | WS_VISIBLE | WS_BORDER | ES_MULTILINE | ES_AUTOVSCROLL | ES_READONLY,
+        10, 115, 380, 100, hWnd, (HMENU)IDC_HASH_EDIT, NULL, NULL);
+    
+    // 复制按钮
+    CreateWindowW(L"BUTTON", L"复制哈希值", 
+        WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
+        10, 225, 100, 30, hWnd, (HMENU)IDC_COPY_BUTTON, NULL, NULL);
+}
+
+// 选择文件
+void BrowseFile(HWND hWnd) {
+    OPENFILENAMEW ofn;
+    WCHAR szFile[MAX_PATH] = {0};
+    
+    ZeroMemory(&ofn, sizeof(ofn));
+    ofn.lStructSize = sizeof(ofn);
+    ofn.hwndOwner = hWnd;
+    ofn.lpstrFile = szFile;
+    ofn.nMaxFile = sizeof(szFile)/sizeof(szFile[0]);
+    ofn.lpstrFilter = L"所有文件\0*.*\0";
+    ofn.nFilterIndex = 1;
+    ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
+    
+    if (GetOpenFileNameW(&ofn)) {
+        SetWindowTextW(g_hFileEdit, szFile);
+    }
+}
+
+// 计算哈希值
+void CalculateHash() {
+    WCHAR wszFile[MAX_PATH];
+    char szFile[MAX_PATH];
+    char szHash[EVP_MAX_MD_SIZE * 2 + 1];
+    
+    GetWindowTextW(g_hFileEdit, wszFile, MAX_PATH);
+    WideCharToMultiByte(CP_UTF8, 0, wszFile, -1, szFile, MAX_PATH, NULL, NULL);
+    
+    int algorithm = SendMessageW(g_hAlgorithmCombo, CB_GETCURSEL, 0, 0);
+    
+    if (calculate_file_hash(szFile, algorithm, szHash) == 0) {
+        WCHAR wszHash[EVP_MAX_MD_SIZE * 2 + 1];
+        MultiByteToWideChar(CP_UTF8, 0, szHash, -1, wszHash, EVP_MAX_MD_SIZE * 2 + 1);
+        SetWindowTextW(g_hHashEdit, wszHash);
+    } else {
+        SetWindowTextW(g_hHashEdit, L"计算哈希值失败");
+    }
+}
+
+// 复制哈希值到剪贴板
+void CopyHashToClipboard() {
+    if (OpenClipboard(NULL)) {
+        EmptyClipboard();
+        
+        int len = GetWindowTextLengthW(g_hHashEdit) + 1;
+        HGLOBAL hMem = GlobalAlloc(GMEM_MOVEABLE, len * sizeof(WCHAR));
+        
+        if (hMem) {
+            WCHAR* pszMem = (WCHAR*)GlobalLock(hMem);
+            GetWindowTextW(g_hHashEdit, pszMem, len);
+            GlobalUnlock(hMem);
+            
+            SetClipboardData(CF_UNICODETEXT, hMem);
+        }
+        
+        CloseClipboard();
+    }
+}
+
+// 窗口过程
+LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
+    switch (message) {
+        case WM_CREATE:
+            InitControls(hWnd);
+            break;
+            
+        case WM_COMMAND:
+            switch (LOWORD(wParam)) {
+                case IDC_BROWSE_BUTTON:
+                    BrowseFile(hWnd);
+                    break;
+                    
+                case IDC_CALCULATE_BUTTON:
+                    CalculateHash();
+                    break;
+                    
+                case IDC_COPY_BUTTON:
+                    CopyHashToClipboard();
+                    break;
+            }
+            break;
+            
+        case WM_DESTROY:
+            PostQuitMessage(0);
+            break;
+            
+        default:
+            return DefWindowProc(hWnd, message, wParam, lParam);
+    }
+    return 0;
+}
+
+// 程序入口
+int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
+    // 注册窗口类
+    WNDCLASSEXW wcex;
+    wcex.cbSize = sizeof(WNDCLASSEX);
+    wcex.style = CS_HREDRAW | CS_VREDRAW;
+    wcex.lpfnWndProc = WndProc;
+    wcex.cbClsExtra = 0;
+    wcex.cbWndExtra = 0;
+    wcex.hInstance = hInstance;
+    wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION);
+    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
+    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
+    wcex.lpszMenuName = NULL;
+    wcex.lpszClassName = L"HashValueExtractor";
+    wcex.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
+    
+    if (!RegisterClassExW(&wcex)) {
+        return 1;
+    }
+    
+    // 创建窗口
+    HWND hWnd = CreateWindowW(
+        L"HashValueExtractor", L"哈希值提取器",
+        WS_OVERLAPPEDWINDOW,
+        CW_USEDEFAULT, CW_USEDEFAULT, 420, 300,
+        NULL, NULL, hInstance, NULL);
+    
+    if (!hWnd) {
+        return 1;
+    }
+    
+    // 显示窗口
+    ShowWindow(hWnd, nCmdShow);
+    UpdateWindow(hWnd);
+    
+    // 消息循环
+    MSG msg;
+    while (GetMessage(&msg, NULL, 0, 0)) {
+        TranslateMessage(&msg);
+        DispatchMessage(&msg);
+    }
+    
+    return (int)msg.wParam;
+}

others/C/hash_value_extractor/src/md5.c

@@ -0,0 +1,35 @@
+#include "hash_calculator.h"
+#include "string_util.h"
+#include <openssl/evp.h>
+#include <stdio.h>
+#include <string.h>
+
+int calculate_md5(const char* filename, char* output) {
+    FILE* file = fopen(filename, "rb");
+    if (!file) return -1;
+
+    EVP_MD_CTX* mdctx = EVP_MD_CTX_new();
+    const EVP_MD* md = EVP_md5();
+    unsigned char hash[EVP_MAX_MD_SIZE];
+    unsigned int hash_len = 0;
+
+    EVP_DigestInit_ex(mdctx, md, NULL);
+
+    unsigned char buffer[1024];
+    size_t bytes_read;
+    while ((bytes_read = fread(buffer, 1, sizeof(buffer), file))) {
+        EVP_DigestUpdate(mdctx, buffer, bytes_read);
+    }
+
+    EVP_DigestFinal_ex(mdctx, hash, &hash_len);
+    EVP_MD_CTX_free(mdctx);
+    fclose(file);
+
+    char* hex = bin_to_hex(hash, hash_len);
+    if (hex) {
+        strcpy(output, hex);
+        str_free(hex);
+        return 0;
+    }
+    return -1;
+}

others/C/hash_value_extractor/src/sha256.c

@@ -0,0 +1,35 @@
+#include "hash_calculator.h"
+#include "string_util.h"
+#include <openssl/evp.h>
+#include <stdio.h>
+#include <string.h>
+
+int calculate_sha256(const char* filename, char* output) {
+    FILE* file = fopen(filename, "rb");
+    if (!file) return -1;
+
+    EVP_MD_CTX* mdctx = EVP_MD_CTX_new();
+    const EVP_MD* md = EVP_sha256();
+    unsigned char hash[EVP_MAX_MD_SIZE];
+    unsigned int hash_len = 0;
+
+    EVP_DigestInit_ex(mdctx, md, NULL);
+
+    unsigned char buffer[1024];
+    size_t bytes_read;
+    while ((bytes_read = fread(buffer, 1, sizeof(buffer), file))) {
+        EVP_DigestUpdate(mdctx, buffer, bytes_read);
+    }
+
+    EVP_DigestFinal_ex(mdctx, hash, &hash_len);
+    EVP_MD_CTX_free(mdctx);
+    fclose(file);
+
+    char* hex = bin_to_hex(hash, hash_len);
+    if (hex) {
+        strcpy(output, hex);
+        str_free(hex);
+        return 0;
+    }
+    return -1;
+}

others/C/hash_value_extractor/src/sha512.c

@@ -0,0 +1,35 @@
+#include "hash_calculator.h"
+#include "string_util.h"
+#include <openssl/evp.h>
+#include <stdio.h>
+#include <string.h>
+
+int calculate_sha512(const char* filename, char* output) {
+    FILE* file = fopen(filename, "rb");
+    if (!file) return -1;
+
+    EVP_MD_CTX* mdctx = EVP_MD_CTX_new();
+    const EVP_MD* md = EVP_sha512();
+    unsigned char hash[EVP_MAX_MD_SIZE];
+    unsigned int hash_len = 0;
+
+    EVP_DigestInit_ex(mdctx, md, NULL);
+
+    unsigned char buffer[1024];
+    size_t bytes_read;
+    while ((bytes_read = fread(buffer, 1, sizeof(buffer), file))) {
+        EVP_DigestUpdate(mdctx, buffer, bytes_read);
+    }
+
+    EVP_DigestFinal_ex(mdctx, hash, &hash_len);
+    EVP_MD_CTX_free(mdctx);
+    fclose(file);
+
+    char* hex = bin_to_hex(hash, hash_len);
+    if (hex) {
+        strcpy(output, hex);
+        str_free(hex);
+        return 0;
+    }
+    return -1;
+}

others/C/hash_value_extractor/src/string_util.c

@@ -0,0 +1,120 @@
+#include "string_util.h"
+#include <stdlib.h>
+#include <string.h>
+
+// 内存池块大小
+#define MEMORY_BLOCK_SIZE 4096
+
+// 内存池结构
+typedef struct MemoryBlock {
+    char* buffer;
+    size_t used;
+    struct MemoryBlock* next;
+} MemoryBlock;
+
+static MemoryBlock* memory_pool = NULL;
+
+// 初始化内存池
+static void init_memory_pool() {
+    if (memory_pool == NULL) {
+        memory_pool = malloc(sizeof(MemoryBlock));
+        memory_pool->buffer = malloc(MEMORY_BLOCK_SIZE);
+        memory_pool->used = 0;
+        memory_pool->next = NULL;
+    }
+}
+
+// 从内存池分配
+static char* pool_alloc(size_t size) {
+    init_memory_pool();
+    
+    MemoryBlock* block = memory_pool;
+    while (block != NULL) {
+        if (MEMORY_BLOCK_SIZE - block->used >= size) {
+            char* ptr = block->buffer + block->used;
+            block->used += size;
+            return ptr;
+        }
+        if (block->next == NULL) {
+            block->next = malloc(sizeof(MemoryBlock));
+            block = block->next;
+            block->buffer = malloc(MEMORY_BLOCK_SIZE);
+            block->used = 0;
+            block->next = NULL;
+        } else {
+            block = block->next;
+        }
+    }
+    return NULL;
+}
+
+char* str_alloc(size_t size) {
+    // 小内存从池分配，大内存直接分配
+    if (size <= MEMORY_BLOCK_SIZE / 4) {
+        char* ptr = pool_alloc(size + 1); // +1 for null terminator
+        if (ptr != NULL) {
+            ptr[size] = '\0';
+            return ptr;
+        }
+    }
+    char* ptr = malloc(size + 1);
+    if (ptr != NULL) {
+        ptr[size] = '\0';
+    }
+    return ptr;
+}
+
+void str_free(char* str) {
+    // 池分配的内存不单独释放
+    if (str == NULL) return;
+    
+    // 检查是否在内存池中
+    MemoryBlock* block = memory_pool;
+    while (block != NULL) {
+        if (str >= block->buffer && str < block->buffer + MEMORY_BLOCK_SIZE) {
+            return; // 池内存不释放
+        }
+        block = block->next;
+    }
+    
+    free(str);
+}
+
+char* str_copy(const char* src) {
+    if (src == NULL) return NULL;
+    
+    size_t len = strlen(src);
+    char* dest = str_alloc(len);
+    if (dest != NULL) {
+        memcpy(dest, src, len);
+    }
+    return dest;
+}
+
+char* str_concat(const char* str1, const char* str2) {
+    if (str1 == NULL) return str_copy(str2);
+    if (str2 == NULL) return str_copy(str1);
+    
+    size_t len1 = strlen(str1);
+    size_t len2 = strlen(str2);
+    char* result = str_alloc(len1 + len2);
+    if (result != NULL) {
+        memcpy(result, str1, len1);
+        memcpy(result + len1, str2, len2);
+    }
+    return result;
+}
+
+char* bin_to_hex(const unsigned char* data, size_t len) {
+    if (data == NULL || len == 0) return NULL;
+    
+    char* hex = str_alloc(len * 2);
+    if (hex != NULL) {
+        static const char hex_chars[] = "0123456789abcdef";
+        for (size_t i = 0; i < len; i++) {
+            hex[i * 2] = hex_chars[(data[i] >> 4) & 0x0F];
+            hex[i * 2 + 1] = hex_chars[data[i] & 0x0F];
+        }
+    }
+    return hex;
+}