added libquickmail and email registration

1 files changed, 1123 insertions, 0 deletions

diff --git a/3rdParty/libquickmail/quickmail.c b/3rdParty/libquickmail/quickmail.c
new file mode 100644
index 0000000..ab65535
--- /dev/null
+++ b/3rdParty/libquickmail/quickmail.c
@@ -0,0 +1,1123 @@
+/*
+    This file is part of libquickmail.
+
+    libquickmail is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    libquickmail is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with libquickmail.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#if defined(_WIN32) && defined(DLL_EXPORT) && !defined(BUILD_QUICKMAIL_DLL)
+#define BUILD_QUICKMAIL_DLL
+#endif
+#include "quickmail.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+#if _MSC_VER
+#define snprintf _snprintf
+#define strdup _strdup
+#endif
+#ifndef NOCURL
+#if (defined(STATIC) || defined(BUILD_QUICKMAIL_STATIC)) && !defined(CURL_STATICLIB)
+#define CURL_STATICLIB
+#endif
+#include <curl/curl.h>
+#else
+#include "smtpsocket.h"
+#endif
+
+#define LIBQUICKMAIL_VERSION_MAJOR 0
+#define LIBQUICKMAIL_VERSION_MINOR 1
+#define LIBQUICKMAIL_VERSION_MICRO 18
+
+#define VERSION_STRINGIZE_(major, minor, micro) #major"."#minor"."#micro
+#define VERSION_STRINGIZE(major, minor, micro) VERSION_STRINGIZE_(major, minor, micro)
+
+#define LIBQUICKMAIL_VERSION VERSION_STRINGIZE(LIBQUICKMAIL_VERSION_MAJOR,LIBQUICKMAIL_VERSION_MINOR,LIBQUICKMAIL_VERSION_MICRO)
+
+#define NEWLINE "\r\n"
+#define NEWLINELENGTH 2
+//#define NEWLINE "\n"
+//#define NEWLINELENGTH 1
+
+#define MIME_LINE_WIDTH 72
+#define BODY_BUFFER_SIZE 256
+
+//definitions of the differen stages of generating the message data
+#define MAILPART_INITIALIZE 0
+#define MAILPART_HEADER     1
+#define MAILPART_BODY       2
+#define MAILPART_BODY_DONE  3
+#define MAILPART_ATTACHMENT 4
+#define MAILPART_END        5
+#define MAILPART_DONE       6
+
+static const char* default_mime_type = "text/plain";
+
+////////////////////////////////////////////////////////////////////////
+
+#define DEBUG_ERROR(errmsg)
+static const char* ERRMSG_MEMORY_ALLOCATION_ERROR = "Memory allocation error";
+
+////////////////////////////////////////////////////////////////////////
+
+char* randomize_zeros (char* data)
+{
+  //replace all 0s with random digits
+  char* p = data;
+  while (*p) {
+    if (*p == '0')
+      *p = '0' + rand() % 10;
+    p++;
+  }
+  return data;
+}
+
+char* str_append (char** data, const char* newdata)
+{
+  //append a string to the end of an existing string
+  char* p;
+  int len = (*data ? strlen(*data) : 0);
+  if ((p = (char*)realloc(*data, len + strlen(newdata) + 1)) == NULL) {
+    free(p);
+    DEBUG_ERROR(ERRMSG_MEMORY_ALLOCATION_ERROR)
+    return NULL;
+  }
+  *data = p;
+  strcpy(*data + len, newdata);
+  return *data;
+}
+
+////////////////////////////////////////////////////////////////////////
+
+struct email_info_struct {
+  int current;  //must be zet to 0
+  time_t timestamp;
+  char* from;
+  struct email_info_email_list_struct* to;
+  struct email_info_email_list_struct* cc;
+  struct email_info_email_list_struct* bcc;
+  char* subject;
+  char* header;
+  struct email_info_attachment_list_struct* bodylist;
+  struct email_info_attachment_list_struct* attachmentlist;
+  char* buf;
+  int buflen;
+  char* mime_boundary_body;
+  char* mime_boundary_part;
+  struct email_info_attachment_list_struct* current_attachment;
+  FILE* debuglog;
+  char dtable[64];
+};
+
+////////////////////////////////////////////////////////////////////////
+
+struct email_info_email_list_struct {
+  char* data;
+  struct email_info_email_list_struct* next;
+};
+
+void email_info_string_list_add (struct email_info_email_list_struct** list, const char* data)
+{
+  struct email_info_email_list_struct** p = list;
+  while (*p)
+    p = &(*p)->next;
+  if ((*p = (struct email_info_email_list_struct*)malloc(sizeof(struct email_info_email_list_struct))) == NULL) {
+    DEBUG_ERROR(ERRMSG_MEMORY_ALLOCATION_ERROR)
+    return;
+  }
+  (*p)->data = (data ? strdup(data) : NULL);
+  (*p)->next = NULL;
+}
+
+void email_info_string_list_free (struct email_info_email_list_struct** list)
+{
+  struct email_info_email_list_struct* p = *list;
+  struct email_info_email_list_struct* current;
+  while (p) {
+    current = p;
+    p = current->next;
+    free(current->data);
+    free(current);
+  }
+  *list = NULL;
+}
+
+char* email_info_string_list_concatenate (struct email_info_email_list_struct* list)
+{
+  char* result = NULL;
+  struct email_info_email_list_struct* listentry = list;
+  while (listentry) {
+    if (listentry->data && *listentry->data) {
+      if (result)
+        str_append(&result, "," NEWLINE "\t");
+      str_append(&result, "<");
+      str_append(&result, listentry->data);
+      str_append(&result, ">");
+    }
+    listentry = listentry->next;
+  }
+  return result;
+}
+
+////////////////////////////////////////////////////////////////////////
+
+struct email_info_attachment_list_struct {
+  char* filename;
+  char* mimetype;
+  void* filedata;
+  void* handle;
+  quickmail_attachment_open_fn email_info_attachment_open;
+  quickmail_attachment_read_fn email_info_attachment_read;
+  quickmail_attachment_close_fn email_info_attachment_close;
+  quickmail_attachment_free_filedata_fn email_info_attachment_filedata_free;
+  struct email_info_attachment_list_struct* next;
+};
+
+struct email_info_attachment_list_struct* email_info_attachment_list_add (struct email_info_attachment_list_struct** list, const char* filename, const char* mimetype, void* filedata, quickmail_attachment_open_fn email_info_attachment_open, quickmail_attachment_read_fn email_info_attachment_read, quickmail_attachment_close_fn email_info_attachment_close, quickmail_attachment_free_filedata_fn email_info_attachment_filedata_free)
+{
+  struct email_info_attachment_list_struct** p = list;
+  while (*p)
+    p = &(*p)->next;
+  if ((*p = (struct email_info_attachment_list_struct*)malloc(sizeof(struct email_info_attachment_list_struct))) == NULL) {
+    DEBUG_ERROR(ERRMSG_MEMORY_ALLOCATION_ERROR)
+    return NULL;
+  }
+  (*p)->filename = strdup(filename ? filename : "UNNAMED");
+  (*p)->mimetype = (mimetype ? strdup(mimetype) : NULL);
+  (*p)->filedata = filedata;
+  (*p)->handle = NULL;
+  (*p)->email_info_attachment_open = email_info_attachment_open;
+  (*p)->email_info_attachment_read = email_info_attachment_read;
+  (*p)->email_info_attachment_close = email_info_attachment_close;
+  (*p)->email_info_attachment_filedata_free = email_info_attachment_filedata_free;
+  (*p)->next = NULL;
+  return *p;
+}
+
+void email_info_attachment_list_free_entry (struct email_info_attachment_list_struct* current)
+{
+  if (current->handle) {
+    if (current->email_info_attachment_close)
+      current->email_info_attachment_close(current->handle);
+    //else
+    //  free(current->handle);
+    current->handle = NULL;
+  }
+  if (current->filedata) {
+    if (current->email_info_attachment_filedata_free)
+      current->email_info_attachment_filedata_free(current->filedata);
+    else
+      free(current->filedata);
+  }
+  if (current->mimetype)
+    free(current->mimetype);
+  free(current->filename);
+  free(current);
+}
+
+void email_info_attachment_list_free (struct email_info_attachment_list_struct** list)
+{
+  struct email_info_attachment_list_struct* p = *list;
+  struct email_info_attachment_list_struct* current;
+  while (p) {
+    current = p;
+    p = current->next;
+    email_info_attachment_list_free_entry(current);
+  }
+  *list = NULL;
+}
+
+int email_info_attachment_list_delete (struct email_info_attachment_list_struct** list, const char* filename)
+{
+  struct email_info_attachment_list_struct** p = list;
+  while (*p) {
+    if (strcmp((*p)->filename, filename) == 0) {
+      struct email_info_attachment_list_struct* current = *p;
+      *p = current->next;
+      email_info_attachment_list_free_entry(current);
+      return 0;
+    }
+    p = &(*p)->next;
+  }
+  return -1;
+}
+
+void email_info_attachment_list_close_handles (struct email_info_attachment_list_struct* list)
+{
+  struct email_info_attachment_list_struct* p = list;
+  while (p) {
+    if (p->handle) {
+      if (p->email_info_attachment_close)
+        p->email_info_attachment_close(p->handle);
+      //else
+      //  free(p->handle);
+      p->handle = NULL;
+    }
+    p = p->next;
+  }
+}
+
+//dummy attachment functions
+
+void* email_info_attachment_open_dummy (void* filedata)
+{
+  return &email_info_attachment_open_dummy;
+}
+
+size_t email_info_attachment_read_dummy (void* handle, void* buf, size_t len)
+{
+  return 0;
+}
+
+struct email_info_attachment_list_struct* email_info_attachment_list_add_dummy (struct email_info_attachment_list_struct** list, const char* filename, const char* mimetype)
+{
+  return email_info_attachment_list_add(list, filename, mimetype, NULL, email_info_attachment_open_dummy, email_info_attachment_read_dummy, NULL, NULL);
+}
+
+//file attachment functions
+
+void* email_info_attachment_open_file (void* filedata)
+{
+  return (void*)fopen((char*)filedata, "rb");
+}
+
+size_t email_info_attachment_read_file (void* handle, void* buf, size_t len)
+{
+  return fread(buf, 1, len, (FILE*)handle);
+}
+
+void email_info_attachment_close_file (void* handle)
+{
+  if (handle)
+    fclose((FILE*)handle);
+}
+
+struct email_info_attachment_list_struct* email_info_attachment_list_add_file (struct email_info_attachment_list_struct** list, const char* path, const char* mimetype)
+{
+  //determine base filename
+  const char* basename = path + strlen(path);
+  while (basename != path) {
+    basename--;
+    if (*basename == '/'
+#ifdef _WIN32
+        || *basename == '\\' || *basename == ':'
+#endif
+    ) {
+      basename++;
+      break;
+    }
+  }
+  return email_info_attachment_list_add(list, basename, mimetype, (void*)strdup(path), email_info_attachment_open_file, email_info_attachment_read_file, email_info_attachment_close_file, NULL);
+}
+
+//memory attachment functions
+
+struct email_info_attachment_memory_filedata_struct {
+  char* data;
+  size_t datalen;
+  int mustfree;
+};
+
+struct email_info_attachment_memory_handle_struct {
+  const char* data;
+  size_t datalen;
+  size_t pos;
+};
+
+void* email_info_attachment_open_memory (void* filedata)
+{
+  struct email_info_attachment_memory_filedata_struct* data;
+  struct email_info_attachment_memory_handle_struct* result;
+  data = ((struct email_info_attachment_memory_filedata_struct*)filedata);
+  if (!data->data)
+    return NULL;
+  if ((result = (struct email_info_attachment_memory_handle_struct*)malloc(sizeof(struct email_info_attachment_memory_handle_struct))) == NULL) {
+    DEBUG_ERROR(ERRMSG_MEMORY_ALLOCATION_ERROR)
+    return NULL;
+  }
+  result->data = data->data;
+  result->datalen = data->datalen;
+  result->pos = 0;
+  return result;
+}
+
+size_t email_info_attachment_read_memory (void* handle, void* buf, size_t len)
+{
+  struct email_info_attachment_memory_handle_struct* h = (struct email_info_attachment_memory_handle_struct*)handle;
+  size_t n = (h->pos + len <= h->datalen ? len : h->datalen - h->pos);
+  memcpy(buf, h->data + h->pos, n);
+  h->pos += n;
+  return n;
+}
+
+void email_info_attachment_close_memory (void* handle)
+{
+  if (handle)
+    free(handle);
+}
+
+void email_info_attachment_filedata_free_memory (void* filedata)
+{
+  struct email_info_attachment_memory_filedata_struct* data = ((struct email_info_attachment_memory_filedata_struct*)filedata);
+  if (data) {
+    if (data->mustfree)
+      free(data->data);
+    free(data);
+  }
+}
+
+struct email_info_attachment_list_struct* email_info_attachment_list_add_memory (struct email_info_attachment_list_struct** list, const char* filename, const char* mimetype, char* data, size_t datalen, int mustfree)
+{
+  struct email_info_attachment_memory_filedata_struct* filedata;
+  if ((filedata = (struct email_info_attachment_memory_filedata_struct*)malloc(sizeof(struct email_info_attachment_memory_filedata_struct))) == NULL) {
+    DEBUG_ERROR(ERRMSG_MEMORY_ALLOCATION_ERROR)
+    return NULL;
+  }
+  filedata->data = data;
+  filedata->datalen = datalen;
+  filedata->mustfree = mustfree;
+  return email_info_attachment_list_add(list, filename, mimetype, filedata, email_info_attachment_open_memory, email_info_attachment_read_memory, email_info_attachment_close_memory, email_info_attachment_filedata_free_memory);
+}
+
+////////////////////////////////////////////////////////////////////////
+
+DLL_EXPORT_LIBQUICKMAIL const char* quickmail_get_version ()
+{
+  return VERSION_STRINGIZE(LIBQUICKMAIL_VERSION_MAJOR, LIBQUICKMAIL_VERSION_MINOR, LIBQUICKMAIL_VERSION_MICRO)
+#if defined(NOCURL)
+    "-light"
+#endif
+  ;
+}
+
+DLL_EXPORT_LIBQUICKMAIL int quickmail_initialize ()
+{
+#if defined(NOCURL) && defined(_WIN32)
+  static WSADATA wsaData;
+  int wsaerr = WSAStartup(MAKEWORD(1, 0), &wsaData);
+  if (wsaerr)
+    return -1;
+  atexit((void(*)())WSACleanup);
+#endif
+  return 0;
+}
+
+DLL_EXPORT_LIBQUICKMAIL quickmail quickmail_create (const char* from, const char* subject)
+{
+  int i;
+  struct email_info_struct* mailobj;
+  if ((mailobj = (struct email_info_struct*)malloc(sizeof(struct email_info_struct))) == NULL) {
+    DEBUG_ERROR(ERRMSG_MEMORY_ALLOCATION_ERROR)
+    return NULL;
+  }
+  mailobj->current = 0;
+  mailobj->timestamp = time(NULL);
+  mailobj->from = (from ? strdup(from) : NULL);
+  mailobj->to = NULL;
+  mailobj->cc = NULL;
+  mailobj->bcc = NULL;
+  mailobj->subject = (subject ? strdup(subject) : NULL);
+  mailobj->header = NULL;
+  mailobj->bodylist = NULL;
+  mailobj->attachmentlist = NULL;
+  mailobj->buf = NULL;
+  mailobj->buflen = 0;
+  mailobj->mime_boundary_body = NULL;
+  mailobj->mime_boundary_part = NULL;
+  mailobj->current_attachment = NULL;
+  mailobj->debuglog = NULL;
+  for (i = 0; i < 26; i++) {
+    mailobj->dtable[i] = (char)('A' + i);
+    mailobj->dtable[26 + i] = (char)('a' + i);
+  }
+  for (i = 0; i < 10; i++) {
+    mailobj->dtable[52 + i] = (char)('0' + i);
+  }
+  mailobj->dtable[62] = '+';
+  mailobj->dtable[63] = '/';
+  srand(time(NULL));
+  return mailobj;
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_destroy (quickmail mailobj)
+{
+  free(mailobj->from);
+  email_info_string_list_free(&mailobj->to);
+  email_info_string_list_free(&mailobj->cc);
+  email_info_string_list_free(&mailobj->bcc);
+  free(mailobj->subject);
+  free(mailobj->header);
+  email_info_attachment_list_free(&mailobj->bodylist);
+  email_info_attachment_list_free(&mailobj->attachmentlist);
+  free(mailobj->buf);
+  free(mailobj->mime_boundary_body);
+  free(mailobj->mime_boundary_part);
+  free(mailobj);
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_set_from (quickmail mailobj, const char* from)
+{
+  free(mailobj->from);
+  mailobj->from = strdup(from);
+}
+
+DLL_EXPORT_LIBQUICKMAIL const char* quickmail_get_from (quickmail mailobj)
+{
+  return mailobj->from;
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_add_to (quickmail mailobj, const char* email)
+{
+  email_info_string_list_add(&mailobj->to, email);
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_add_cc (quickmail mailobj, const char* email)
+{
+  email_info_string_list_add(&mailobj->cc, email);
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_add_bcc (quickmail mailobj, const char* email)
+{
+  email_info_string_list_add(&mailobj->bcc, email);
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_set_subject (quickmail mailobj, const char* subject)
+{
+  free(mailobj->subject);
+  mailobj->subject = (subject ? strdup(subject) : NULL);
+}
+
+DLL_EXPORT_LIBQUICKMAIL const char* quickmail_get_subject (quickmail mailobj)
+{
+  return mailobj->subject;
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_add_header (quickmail mailobj, const char* headerline)
+{
+  str_append(&mailobj->header, headerline);
+  str_append(&mailobj->header, NEWLINE);
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_set_body (quickmail mailobj, const char* body)
+{
+  email_info_attachment_list_free(&mailobj->bodylist);
+  if (body)
+    email_info_attachment_list_add_memory(&mailobj->bodylist, default_mime_type, default_mime_type, strdup(body), strlen(body), 1);
+}
+
+DLL_EXPORT_LIBQUICKMAIL char* quickmail_get_body (quickmail mailobj)
+{
+  size_t n;
+  char* p;
+  char* result = NULL;
+  size_t resultlen = 0;
+  if (mailobj->bodylist && (mailobj->bodylist->handle = mailobj->bodylist->email_info_attachment_open(mailobj->bodylist->filedata)) != NULL) {
+    do {
+      if ((p = (char*)realloc(result, resultlen + BODY_BUFFER_SIZE)) == NULL) {
+        free(result);
+        DEBUG_ERROR(ERRMSG_MEMORY_ALLOCATION_ERROR)
+        break;
+      }
+      result = p;
+      if ((n = mailobj->bodylist->email_info_attachment_read(mailobj->bodylist->handle, result + resultlen, BODY_BUFFER_SIZE)) > 0)
+        resultlen += n;
+    } while (n > 0);
+    if (mailobj->bodylist->email_info_attachment_close)
+      mailobj->bodylist->email_info_attachment_close(mailobj->bodylist->handle);
+    //else
+    //  free(mailobj->bodylist->handle);
+    mailobj->bodylist->handle = NULL;
+  }
+  return result;
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_add_body_file (quickmail mailobj, const char* mimetype, const char* path)
+{
+  email_info_attachment_list_add(&mailobj->bodylist, (mimetype ? mimetype : default_mime_type), (mimetype ? mimetype : default_mime_type), (void*)strdup(path), email_info_attachment_open_file, email_info_attachment_read_file, email_info_attachment_close_file, NULL);
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_add_body_memory (quickmail mailobj, const char* mimetype, char* data, size_t datalen, int mustfree)
+{
+  email_info_attachment_list_add_memory(&mailobj->bodylist, (mimetype ? mimetype : default_mime_type), (mimetype ? mimetype : default_mime_type), data, datalen, mustfree);
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_add_body_custom (quickmail mailobj, const char* mimetype, char* data, quickmail_attachment_open_fn attachment_data_open, quickmail_attachment_read_fn attachment_data_read, quickmail_attachment_close_fn attachment_data_close, quickmail_attachment_free_filedata_fn attachment_data_filedata_free)
+{
+  email_info_attachment_list_add(&mailobj->bodylist, (mimetype ? mimetype : default_mime_type), (mimetype ? mimetype : default_mime_type), data, (attachment_data_open ? attachment_data_open : email_info_attachment_open_dummy), (attachment_data_read ? attachment_data_read : email_info_attachment_read_dummy), attachment_data_close, attachment_data_filedata_free);
+}
+
+DLL_EXPORT_LIBQUICKMAIL int quickmail_remove_body (quickmail mailobj, const char* mimetype)
+{
+  return email_info_attachment_list_delete(&mailobj->bodylist, mimetype);
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_list_bodies (quickmail mailobj, quickmail_list_attachment_callback_fn callback, void* callbackdata)
+{
+  struct email_info_attachment_list_struct* p = mailobj->bodylist;
+  while (p) {
+    callback(mailobj, p->filename, p->mimetype, p->email_info_attachment_open, p->email_info_attachment_read, p->email_info_attachment_close, callbackdata);
+    p = p->next;
+  }
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_add_attachment_file (quickmail mailobj, const char* path, const char* mimetype)
+{
+  email_info_attachment_list_add_file(&mailobj->attachmentlist, path, mimetype);
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_add_attachment_memory (quickmail mailobj, const char* filename, const char* mimetype, char* data, size_t datalen, int mustfree)
+{
+  email_info_attachment_list_add_memory(&mailobj->attachmentlist, filename, mimetype, data, datalen, mustfree);
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_add_attachment_custom (quickmail mailobj, const char* filename, const char* mimetype, char* data, quickmail_attachment_open_fn attachment_data_open, quickmail_attachment_read_fn attachment_data_read, quickmail_attachment_close_fn attachment_data_close, quickmail_attachment_free_filedata_fn attachment_data_filedata_free)
+{
+  email_info_attachment_list_add(&mailobj->attachmentlist, filename, mimetype, data, (attachment_data_open ? attachment_data_open : email_info_attachment_open_dummy), (attachment_data_read ? attachment_data_read : email_info_attachment_read_dummy), attachment_data_close, attachment_data_filedata_free);
+}
+
+DLL_EXPORT_LIBQUICKMAIL int quickmail_remove_attachment (quickmail mailobj, const char* filename)
+{
+  return email_info_attachment_list_delete(&mailobj->attachmentlist, filename);
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_list_attachments (quickmail mailobj, quickmail_list_attachment_callback_fn callback, void* callbackdata)
+{
+  struct email_info_attachment_list_struct* p = mailobj->attachmentlist;
+  while (p) {
+    callback(mailobj, p->filename, p->mimetype, p->email_info_attachment_open, p->email_info_attachment_read, p->email_info_attachment_close, callbackdata);
+    p = p->next;
+  }
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_set_debug_log (quickmail mailobj, FILE* filehandle)
+{
+  mailobj->debuglog = filehandle;
+}
+
+DLL_EXPORT_LIBQUICKMAIL void quickmail_fsave (quickmail mailobj, FILE* filehandle)
+{
+  int i;
+  size_t n;
+  char buf[80];
+  while ((n = quickmail_get_data(buf, sizeof(buf), 1, mailobj)) > 0) {
+    for (i = 0; i < n; i++)
+      fprintf(filehandle, "%c", buf[i]);
+  }
+}
+
+DLL_EXPORT_LIBQUICKMAIL size_t quickmail_get_data (void* ptr, size_t size, size_t nmemb, void* userp)
+{
+  struct email_info_struct* mailobj = (struct email_info_struct*)userp;
+
+  //abort if no data is requested
+  if (size * nmemb == 0)
+    return 0;
+
+  //initialize on first run
+  if (mailobj->current == MAILPART_INITIALIZE) {
+    free(mailobj->buf);
+    mailobj->buf = NULL;
+    mailobj->buflen = 0;
+    free(mailobj->mime_boundary_body);
+    mailobj->mime_boundary_body = NULL;
+    free(mailobj->mime_boundary_part);
+    mailobj->mime_boundary_part = NULL;
+    mailobj->current_attachment = mailobj->bodylist;
+    mailobj->current++;
+  }
+
+  //process current part of mail if no partial data is pending
+  while (mailobj->buflen == 0) {
+    if (mailobj->buflen == 0 && mailobj->current == MAILPART_HEADER) {
+      char* s;
+      //generate header part
+      char** p = &mailobj->buf;
+      mailobj->buf = NULL;
+      str_append(p, "User-Agent: libquickmail v" LIBQUICKMAIL_VERSION NEWLINE);
+      if (mailobj->timestamp != 0) {
+        char timestamptext[32];
+        if (strftime(timestamptext, sizeof(timestamptext), "%a, %d %b %Y %H:%M:%S %z", localtime(&mailobj->timestamp))) {

+          str_append(p, "Date: ");
+          str_append(p, timestamptext);
+          str_append(p, NEWLINE);
+        }
+#ifdef _WIN32

+        //fallback method for Windows when %z (time zone offset) fails
+        else if (strftime(timestamptext, sizeof(timestamptext), "%a, %d %b %Y %H:%M:%S", localtime(&mailobj->timestamp))) {

+          TIME_ZONE_INFORMATION tzinfo;

+          if (GetTimeZoneInformation(&tzinfo) != TIME_ZONE_ID_INVALID)

+            sprintf(timestamptext + strlen(timestamptext), " %c%02i%02i", (tzinfo.Bias > 0 ? '-' : '+'), (int)-tzinfo.Bias / 60, (int)-tzinfo.Bias % 60);

+          str_append(p, "Date: ");
+          str_append(p, timestamptext);
+          str_append(p, NEWLINE);
+        }
+#endif

+      }
+      if (mailobj->from && *mailobj->from) {
+        str_append(p, "From: <");
+        str_append(p, mailobj->from);
+        str_append(p, ">" NEWLINE);
+      }
+      if ((s = email_info_string_list_concatenate(mailobj->to)) != NULL) {
+        str_append(p, "To: ");
+        str_append(p, s);
+        str_append(p, NEWLINE);
+        free(s);
+      }
+      if ((s = email_info_string_list_concatenate(mailobj->cc)) != NULL) {
+        str_append(p, "Cc: ");
+        str_append(p, s);
+        str_append(p, NEWLINE);
+        free(s);
+      }
+      if (mailobj->subject) {
+        str_append(p, "Subject: ");
+        str_append(p, mailobj->subject);
+        str_append(p, NEWLINE);
+      }
+      if (mailobj->header) {
+        str_append(p, mailobj->header);
+      }
+      if (mailobj->attachmentlist) {
+        str_append(p, "MIME-Version: 1.0" NEWLINE);
+      }
+      if (mailobj->attachmentlist) {
+        mailobj->mime_boundary_part = randomize_zeros(strdup("=PART=SEPARATOR=_0000_0000_0000_0000_0000_0000_="));
+        str_append(p, "Content-Type: multipart/mixed; boundary=\"");
+        str_append(p, mailobj->mime_boundary_part);
+        str_append(p, "\"" NEWLINE NEWLINE "This is a multipart message in MIME format." NEWLINE NEWLINE "--");
+        str_append(p, mailobj->mime_boundary_part);
+        str_append(p, NEWLINE);
+      }
+      if (mailobj->bodylist && mailobj->bodylist->next) {
+        mailobj->mime_boundary_body = randomize_zeros(strdup("=BODY=SEPARATOR=_0000_0000_0000_0000_0000_0000_="));
+        str_append(p, "Content-Type: multipart/alternative; boundary=\"");
+        str_append(p, mailobj->mime_boundary_body);
+        str_append(p, NEWLINE);
+      }
+      mailobj->buflen = strlen(mailobj->buf);
+      mailobj->current++;
+    }
+    if (mailobj->buflen == 0 && mailobj->current == MAILPART_BODY) {
+      if (mailobj->current_attachment) {
+        if (!mailobj->current_attachment->handle) {
+          //open file with body data
+          while (mailobj->current_attachment) {
+            if ((mailobj->current_attachment->handle = mailobj->current_attachment->email_info_attachment_open(mailobj->current_attachment->filedata)) != NULL) {
+              break;
+            }
+            mailobj->current_attachment = mailobj->current_attachment->next;
+          }
+          if (!mailobj->current_attachment) {
+            mailobj->current_attachment = mailobj->attachmentlist;
+            mailobj->current++;
+          }
+          //generate attachment header
+          if (mailobj->current_attachment && mailobj->current_attachment->handle) {
+            mailobj->buf = NULL;
+            if (mailobj->mime_boundary_body) {
+              mailobj->buf = str_append(&mailobj->buf, NEWLINE "--");
+              mailobj->buf = str_append(&mailobj->buf, mailobj->mime_boundary_body);
+              mailobj->buf = str_append(&mailobj->buf, NEWLINE);
+            }
+            mailobj->buf = str_append(&mailobj->buf, "Content-Type: ");
+            mailobj->buf = str_append(&mailobj->buf, (mailobj->bodylist && mailobj->current_attachment->filename ? mailobj->current_attachment->filename : default_mime_type));
+            mailobj->buf = str_append(&mailobj->buf, NEWLINE "Content-Transfer-Encoding: 8bit" NEWLINE "Content-Disposition: inline" NEWLINE NEWLINE);
+            mailobj->buflen = strlen(mailobj->buf);
+          }
+        }
+        if (mailobj->buflen == 0 && mailobj->current_attachment && mailobj->current_attachment->handle) {
+          //read body data
+          if ((mailobj->buf = malloc(BODY_BUFFER_SIZE)) == NULL) {
+            DEBUG_ERROR(ERRMSG_MEMORY_ALLOCATION_ERROR)
+          }
+          if (mailobj->buf == NULL || (mailobj->buflen = mailobj->current_attachment->email_info_attachment_read(mailobj->current_attachment->handle, mailobj->buf, BODY_BUFFER_SIZE)) <= 0) {
+            //end of file
+            free(mailobj->buf);
+            mailobj->buflen = 0;
+            if (mailobj->current_attachment->email_info_attachment_close)
+              mailobj->current_attachment->email_info_attachment_close(mailobj->current_attachment->handle);
+            //else
+            //  free(mailobj->current_attachment->handle);
+            mailobj->current_attachment->handle = NULL;
+            mailobj->current_attachment = mailobj->current_attachment->next;
+          }
+        }
+      } else {
+        mailobj->current_attachment = mailobj->attachmentlist;
+        mailobj->current++;
+      }
+    }
+    if (mailobj->buflen == 0 && mailobj->current == MAILPART_BODY_DONE) {
+      mailobj->buf = NULL;
+      if (mailobj->mime_boundary_body) {
+        mailobj->buf = str_append(&mailobj->buf, NEWLINE "--");
+        mailobj->buf = str_append(&mailobj->buf, mailobj->mime_boundary_body);
+        mailobj->buf = str_append(&mailobj->buf, "--" NEWLINE);
+        mailobj->buflen = strlen(mailobj->buf);
+        free(mailobj->mime_boundary_body);
+        mailobj->mime_boundary_body = NULL;
+      }
+      mailobj->current++;
+    }
+    if (mailobj->buflen == 0 && mailobj->current == MAILPART_ATTACHMENT) {
+      if (mailobj->current_attachment) {
+        if (!mailobj->current_attachment->handle) {
+          //open file to attach
+          while (mailobj->current_attachment) {
+            if ((mailobj->current_attachment->handle = mailobj->current_attachment->email_info_attachment_open(mailobj->current_attachment->filedata)) != NULL) {
+              break;
+            }
+            mailobj->current_attachment = mailobj->current_attachment->next;
+          }
+          //generate attachment header
+          if (mailobj->current_attachment && mailobj->current_attachment->handle) {
+            mailobj->buf = NULL;
+            if (mailobj->mime_boundary_part) {
+              mailobj->buf = str_append(&mailobj->buf, NEWLINE "--");
+              mailobj->buf = str_append(&mailobj->buf, mailobj->mime_boundary_part);
+              mailobj->buf = str_append(&mailobj->buf, NEWLINE);
+            }
+            mailobj->buf = str_append(&mailobj->buf, "Content-Type: ");
+            mailobj->buf = str_append(&mailobj->buf, (mailobj->current_attachment->mimetype ? mailobj->current_attachment->mimetype : "application/octet-stream"));
+            mailobj->buf = str_append(&mailobj->buf, "; Name=\"");
+            mailobj->buf = str_append(&mailobj->buf, mailobj->current_attachment->filename);
+            mailobj->buf = str_append(&mailobj->buf, "\"" NEWLINE "Content-Transfer-Encoding: base64" NEWLINE NEWLINE);
+            mailobj->buflen = strlen(mailobj->buf);
+          }
+        } else {
+          //generate next line of attachment data
+          size_t n = 0;
+          int mimelinepos = 0;
+          unsigned char igroup[3] = {0, 0, 0};
+          unsigned char ogroup[4];
+          mailobj->buflen = 0;
+          if ((mailobj->buf = (char*)malloc(MIME_LINE_WIDTH + NEWLINELENGTH + 1)) == NULL) {
+            DEBUG_ERROR(ERRMSG_MEMORY_ALLOCATION_ERROR)
+            n = 0;
+          } else {
+            while (mimelinepos < MIME_LINE_WIDTH && (n = mailobj->current_attachment->email_info_attachment_read(mailobj->current_attachment->handle, igroup, 3)) > 0) {
+              //code data
+              ogroup[0] = mailobj->dtable[igroup[0] >> 2];
+              ogroup[1] = mailobj->dtable[((igroup[0] & 3) << 4) | (igroup[1] >> 4)];
+              ogroup[2] = mailobj->dtable[((igroup[1] & 0xF) << 2) | (igroup[2] >> 6)];
+              ogroup[3] = mailobj->dtable[igroup[2] & 0x3F];
+              //padd with "=" characters if less than 3 characters were read
+              if (n < 3) {
+                ogroup[3] = '=';
+                if (n < 2)
+                  ogroup[2] = '=';
+              }
+              memcpy(mailobj->buf + mimelinepos, ogroup, 4);
+              mailobj->buflen += 4;
+              mimelinepos += 4;
+            }
+            if (mimelinepos > 0) {
+              memcpy(mailobj->buf + mimelinepos, NEWLINE, NEWLINELENGTH);
+              mailobj->buflen += NEWLINELENGTH;
+            }
+          }
+          if (n <= 0) {
+            //end of file
+            if (mailobj->current_attachment->email_info_attachment_close)
+              mailobj->current_attachment->email_info_attachment_close(mailobj->current_attachment->handle);
+            else
+              free(mailobj->current_attachment->handle);
+            mailobj->current_attachment->handle = NULL;
+            mailobj->current_attachment = mailobj->current_attachment->next;
+          }
+        }
+      } else {
+        mailobj->current++;
+      }
+    }
+    if (mailobj->buflen == 0 && mailobj->current == MAILPART_END) {
+      mailobj->buf = NULL;
+      mailobj->buflen = 0;
+      if (mailobj->mime_boundary_part) {
+        mailobj->buf = str_append(&mailobj->buf, NEWLINE "--");
+        mailobj->buf = str_append(&mailobj->buf, mailobj->mime_boundary_part);
+        mailobj->buf = str_append(&mailobj->buf, "--" NEWLINE);
+        mailobj->buflen = strlen(mailobj->buf);
+        free(mailobj->mime_boundary_part);
+        mailobj->mime_boundary_part = NULL;
+      }
+      //mailobj->buf = str_append(&mailobj->buf, NEWLINE "." NEWLINE);
+      //mailobj->buflen = strlen(mailobj->buf);
+      mailobj->current++;
+    }
+    if (mailobj->buflen == 0 && mailobj->current == MAILPART_DONE) {
+      break;
+    }
+  }
+
+  //flush pending data if any
+  if (mailobj->buflen > 0) {
+    int len = (mailobj->buflen > size * nmemb ? size * nmemb : mailobj->buflen);
+    memcpy(ptr, mailobj->buf, len);
+    if (len < mailobj->buflen) {
+      mailobj->buf = memmove(mailobj->buf, mailobj->buf + len, mailobj->buflen - len);
+      mailobj->buflen -= len;
+    } else {
+      free(mailobj->buf);
+      mailobj->buf = NULL;
+      mailobj->buflen = 0;
+    }
+    return len;
+  }
+
+  //if (mailobj->current != MAILPART_DONE)
+  //  ;//this should never be reached
+  mailobj->current = 0;
+  return 0;
+}
+
+#ifndef NOCURL
+char* add_angle_brackets (const char* data)
+{
+  size_t datalen = strlen(data);
+  char* result;
+  if ((result = (char*)malloc(datalen + 3)) == NULL) {
+    DEBUG_ERROR(ERRMSG_MEMORY_ALLOCATION_ERROR)
+    return NULL;
+  }
+  result[0] = '<';
+  memcpy(result + 1, data, datalen);
+  result[datalen + 1] = '>';
+  result[datalen + 2] = 0;
+  return result;
+}
+#endif
+
+DLL_EXPORT_LIBQUICKMAIL const char* quickmail_send (quickmail mailobj, const char* smtpserver, unsigned int smtpport, const char* username, const char* password)
+{
+#ifndef NOCURL
+  //libcurl based sending
+  CURL *curl;
+  CURLcode result = CURLE_FAILED_INIT;
+  //curl_global_init(CURL_GLOBAL_ALL);
+  if ((curl = curl_easy_init()) != NULL) {
+    struct curl_slist *recipients = NULL;
+    struct email_info_email_list_struct* listentry;
+    //set destination URL
+    char* addr;
+    size_t len = strlen(smtpserver) + 14;
+    if ((addr = (char*)malloc(len)) == NULL) {
+      DEBUG_ERROR(ERRMSG_MEMORY_ALLOCATION_ERROR)
+      return ERRMSG_MEMORY_ALLOCATION_ERROR;
+    }
+    snprintf(addr, len, "smtp://%s:%u", smtpserver, smtpport);
+    curl_easy_setopt(curl, CURLOPT_URL, addr);
+    free(addr);
+    //try Transport Layer Security (TLS), but continue anyway if it fails
+    curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
+    //don't fail if the TLS/SSL a certificate could not be verified
+    //alternative: add the issuer certificate (or the host certificate if
+    //the certificate is self-signed) to the set of certificates that are
+    //known to libcurl using CURLOPT_CAINFO and/or CURLOPT_CAPATH
+    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
+    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
+    //set authentication credentials if provided
+    if (username && *username)
+      curl_easy_setopt(curl, CURLOPT_USERNAME, username);
+    if (password)
+      curl_easy_setopt(curl, CURLOPT_PASSWORD, password);
+    //set from value for envelope reverse-path
+    if (mailobj->from && *mailobj->from) {
+      addr = add_angle_brackets(mailobj->from);
+      curl_easy_setopt(curl, CURLOPT_MAIL_FROM, addr);
+      free(addr);
+    }
+    //set recipients
+    listentry = mailobj->to;
+    while (listentry) {
+      if (listentry->data && *listentry->data) {
+        addr = add_angle_brackets(listentry->data);
+        recipients = curl_slist_append(recipients, addr);
+        free(addr);
+      }
+      listentry = listentry->next;
+    }
+    listentry = mailobj->cc;
+    while (listentry) {
+      if (listentry->data && *listentry->data) {
+        addr = add_angle_brackets(listentry->data);
+        recipients = curl_slist_append(recipients, addr);
+        free(addr);
+      }
+      listentry = listentry->next;
+    }
+    listentry = mailobj->bcc;
+    while (listentry) {
+      if (listentry->data && *listentry->data) {
+        addr = add_angle_brackets(listentry->data);
+        recipients = curl_slist_append(recipients, addr);
+        free(addr);
+      }
+      listentry = listentry->next;
+    }
+    curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
+    //set callback function for getting message body
+    curl_easy_setopt(curl, CURLOPT_READFUNCTION, quickmail_get_data);
+    curl_easy_setopt(curl, CURLOPT_READDATA, mailobj);
+    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
+    //enable debugging if requested
+    if (mailobj->debuglog) {
+      curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
+      curl_easy_setopt(curl, CURLOPT_STDERR, mailobj->debuglog);
+    }
+    //send the message
+    result = curl_easy_perform(curl);
+    //free the list of recipients and clean up
+    curl_slist_free_all(recipients);
+    curl_easy_cleanup(curl);
+  }
+  return (result == CURLE_OK ? NULL : curl_easy_strerror(result));
+#else
+  //minimal implementation without libcurl
+  SOCKET sock;
+  char* errmsg = NULL;
+  struct email_info_email_list_struct* listentry;
+  char local_hostname[64];
+  int statuscode;
+  //determine local host name
+  if (gethostname(local_hostname, sizeof(local_hostname)) != 0)
+		strcpy(local_hostname, "localhost");
+  //connect
+  if ((sock = socket_open(smtpserver, smtpport, &errmsg)) != INVALID_SOCKET) {
+    //talk with SMTP server
+    if ((statuscode = socket_smtp_command(sock, mailobj->debuglog, NULL)) >= 400) {
+      errmsg = "SMTP server returned an error on connection";
+    } else {
+      size_t n;
+      char buf[WRITE_BUFFER_CHUNK_SIZE];
+      do {
+        if ((statuscode = socket_smtp_command(sock, mailobj->debuglog, "EHLO %s", local_hostname)) >= 400) {
+          if ((statuscode = socket_smtp_command(sock, mailobj->debuglog, "HELO %s", local_hostname)) >= 400) {
+            errmsg = "SMTP EHLO/HELO returned error";
+            break;
+          }
+        }
+        //authenticate if needed
+        if (username || password) {
+          int len;
+          int inpos = 0;
+          int outpos = 0;
+          size_t usernamelen = (username ? strlen(username) : 0);
+          size_t passwordlen = (password ? strlen(password) : 0);
+          char* auth;
+          char* base64auth;
+          if ((auth = (char*)malloc(usernamelen + passwordlen + 4)) == NULL) {
+            DEBUG_ERROR(ERRMSG_MEMORY_ALLOCATION_ERROR)
+            return ERRMSG_MEMORY_ALLOCATION_ERROR;
+          }
+          if ((base64auth = (char*)malloc(((usernamelen + passwordlen + 2) + 2) / 3 * 4 + 1)) == NULL) {
+            DEBUG_ERROR(ERRMSG_MEMORY_ALLOCATION_ERROR)
+            return ERRMSG_MEMORY_ALLOCATION_ERROR;
+          }
+          //leave the authorization identity empty to indicate it's the same the as authentication identity
+          auth[0] = 0;
+          len = 1;
+          //set the authentication identity
+          memcpy(auth + len, (username ? username : ""), usernamelen + 1);
+          len += usernamelen + 1;
+          //set the password
+          memcpy(auth + len, (password ? password : ""), passwordlen + 1);
+          len += passwordlen;
+          //padd with extra zero so groups of 3 bytes can be read
+          auth[usernamelen + len + 1] = 0;
+          //encode in base64
+          while (inpos < len) {
+            //encode data
+            base64auth[outpos + 0] = mailobj->dtable[auth[inpos + 0] >> 2];
+            base64auth[outpos + 1] = mailobj->dtable[((auth[inpos + 0] & 3) << 4) | (auth[inpos + 1] >> 4)];
+            base64auth[outpos + 2] = mailobj->dtable[((auth[inpos + 1] & 0xF) << 2) | (auth[inpos + 2] >> 6)];
+            base64auth[outpos + 3] = mailobj->dtable[auth[inpos + 2] & 0x3F];
+            //padd with "=" characters if less than 3 characters were read
+            if (inpos + 1 >= len) {
+              base64auth[outpos + 3] = '=';
+              if (inpos + 2 >= len)
+                base64auth[outpos + 2] = '=';
+            }
+            //advance to next position
+            inpos += 3;
+            outpos += 4;
+          }
+          base64auth[outpos] = 0;
+          //send originator e-mail address
+          fprintf( stderr, "AUTH PLAIN %s\n", base64auth );
+          if ((statuscode = socket_smtp_command(sock, mailobj->debuglog, "AUTH PLAIN %s", base64auth)) >= 400) {
+            errmsg = "SMTP authentication failed";
+            break;
+          }
+        }
+        //send originator e-mail address
+        if ((statuscode = socket_smtp_command(sock, mailobj->debuglog, "MAIL FROM:<%s>", mailobj->from)) >= 400) {
+          errmsg = "SMTP server did not accept sender";
+          break;
+        }
+        //send recipient e-mail addresses
+        listentry = mailobj->to;
+        while (!errmsg && listentry) {
+          if (listentry->data && *listentry->data) {
+            if ((statuscode = socket_smtp_command(sock, mailobj->debuglog, "RCPT TO:<%s>", listentry->data)) >= 400)
+              errmsg = "SMTP server did not accept e-mail address (To)";
+          }
+          listentry = listentry->next;
+        }
+        listentry = mailobj->cc;
+        while (!errmsg && listentry) {
+          if (listentry->data && *listentry->data) {
+            if ((statuscode = socket_smtp_command(sock, mailobj->debuglog, "RCPT TO:<%s>", listentry->data)) >= 400)
+              errmsg = "SMTP server did not accept e-mail address (CC)";
+          }
+          listentry = listentry->next;
+        }
+        listentry = mailobj->bcc;
+        while (!errmsg && listentry) {
+          if (listentry->data && *listentry->data) {
+            if ((statuscode = socket_smtp_command(sock, mailobj->debuglog, "RCPT TO:<%s>", listentry->data)) >= 400)
+              errmsg = "SMTP server did not accept e-mail address (BCC)";
+          }
+          listentry = listentry->next;
+        }
+        if (errmsg)
+          break;
+        //prepare to send mail body
+        if ((statuscode = socket_smtp_command(sock, mailobj->debuglog, "DATA")) >= 400) {
+          errmsg = "SMTP DATA returned error";
+          break;
+        }
+        //send mail body data
+        while ((n = quickmail_get_data(buf, sizeof(buf), 1, mailobj)) > 0) {
+          socket_send(sock, buf, n);
+        }
+        //send end of data
+        if ((statuscode = socket_smtp_command(sock, mailobj->debuglog, "\r\n.")) >= 400) {
+          errmsg = "SMTP error after sending message data";
+          break;
+        }
+      } while (0);
+      //log out
+      socket_smtp_command(sock, mailobj->debuglog, "QUIT");
+    }
+  }
+  //close socket
+  socket_close(sock);
+  return errmsg;
+#endif
+}