utils.cpp

#include "utils.h"

char *wchar2char(LPCWSTR wc) {
    char *c;
    int size;
    size = WideCharToMultiByte(CP_ACP, 0, wc, -1, NULL, 0, NULL, NULL);
    c = new char[size];
    WideCharToMultiByte(CP_ACP, 0, wc, -1, c, size, NULL, NULL);
    return c;
}

LPCWSTR char2wchar(const char *c) {
    const size_t cSize = strlen(c) + 1;
    wchar_t *wc = new wchar_t[cSize];
    size_t res;
    mbstowcs_s(&res, wc, cSize, c, cSize);
    return wc;
}

// writer used by curl CURLOPT_WRITEFUNCTION
size_t stringWriter(char *data, size_t size, size_t nmemb, string *writerData) {
    if (writerData == NULL) return 0;

    writerData->append(data, size * nmemb);
    return size * nmemb;
}

size_t fileWriter(void *ptr, size_t size, size_t nmemb, void *stream) {
    size_t written = fwrite(ptr, size, nmemb, (FILE *)stream);
    return written;
}

// convert UTF-8 to GB2312
char *UTF8toGB2312(const char *utf8) {
    int len = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, 0);
    wchar_t *wstr = new wchar_t[len + 1];
    memset(wstr, 0, len + 1);
    MultiByteToWideChar(CP_UTF8, 0, utf8, -1, wstr, len);
    len = WideCharToMultiByte(CP_ACP, 0, wstr, -1, NULL, 0, NULL, NULL);
    char *str = new char[len + 1];
    memset(str, 0, len + 1);
    WideCharToMultiByte(CP_ACP, 0, wstr, -1, str, len, NULL, NULL);
    if (wstr) delete[] wstr;
    return str;
}

// convert GB2312 to UTF-8
char *GB2312toUTF8(const char *gb2312) {
    int len = MultiByteToWideChar(CP_ACP, 0, gb2312, -1, NULL, 0);
    wchar_t *wstr = new wchar_t[len + 1];
    memset(wstr, 0, len + 1);
    MultiByteToWideChar(CP_ACP, 0, gb2312, -1, wstr, len);
    len = WideCharToMultiByte(CP_UTF8, 0, wstr, -1, NULL, 0, NULL, NULL);
    char *str = new char[len + 1];
    memset(str, 0, len + 1);
    WideCharToMultiByte(CP_UTF8, 0, wstr, -1, str, len, NULL, NULL);
    if (wstr) delete[] wstr;
    return str;
}