third-party libs

third-party/curl-7.21.4/docs/examples/getinmemory.c

@@ -0,0 +1,99 @@
+/*****************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ *
+ * Example source code to show how the callback function can be used to
+ * download data into a chunk of memory instead of storing it in a file.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <curl/curl.h>
+
+struct MemoryStruct {
+  char *memory;
+  size_t size;
+};
+
+
+static size_t
+WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
+{
+  size_t realsize = size * nmemb;
+  struct MemoryStruct *mem = (struct MemoryStruct *)data;
+
+  mem->memory = realloc(mem->memory, mem->size + realsize + 1);
+  if (mem->memory == NULL) {
+    /* out of memory! */
+    printf("not enough memory (realloc returned NULL)\n");
+    exit(EXIT_FAILURE);
+  }
+
+  memcpy(&(mem->memory[mem->size]), ptr, realsize);
+  mem->size += realsize;
+  mem->memory[mem->size] = 0;
+
+  return realsize;
+}
+
+
+int main(void)
+{
+  CURL *curl_handle;
+
+  struct MemoryStruct chunk;
+
+  chunk.memory = malloc(1);  /* will be grown as needed by the realloc above */
+  chunk.size = 0;    /* no data at this point */
+
+  curl_global_init(CURL_GLOBAL_ALL);
+
+  /* init the curl session */
+  curl_handle = curl_easy_init();
+
+  /* specify URL to get */
+  curl_easy_setopt(curl_handle, CURLOPT_URL, "http://www.example.com/");
+
+  /* send all data to this function  */
+  curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
+
+  /* we pass our 'chunk' struct to the callback function */
+  curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);
+
+  /* some servers don't like requests that are made without a user-agent
+     field, so we provide one */
+  curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "libcurl-agent/1.0");
+
+  /* get it! */
+  curl_easy_perform(curl_handle);
+
+  /* cleanup curl stuff */
+  curl_easy_cleanup(curl_handle);
+
+  /*
+   * Now, our chunk.memory points to a memory block that is chunk.size
+   * bytes big and contains the remote file.
+   *
+   * Do something nice with it!
+   *
+   * You should be aware of the fact that at this point we might have an
+   * allocated data block, and nothing has yet deallocated that data. So when
+   * you're done with it, you should free() it as a nice application.
+   */
+
+  printf("%lu bytes retrieved\n", (long)chunk.size);
+
+  if(chunk.memory)
+    free(chunk.memory);
+
+  /* we're done with libcurl, so clean it up */
+  curl_global_cleanup();
+
+  return 0;
+}