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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <curl/curl.h>
#include <json.h>
#include "net.h"
#include "common.h"
static size_t memoryCallback(void* contents, size_t size, size_t nmemb, void* userp)
{
size_t realsize = size * nmemb;
struct MemoryStruct* mem = (struct MemoryStruct*)userp;
uint8_t* ptr = realloc(mem->memory, mem->size + realsize + 1);
if(ptr == NULL)
{
fprintf(stderr, "Unable to allocate memory\n");
return 0;
}
mem->memory = ptr;
memcpy(&(mem->memory[mem->size]), contents, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
return realsize;
}
static int xferinfo(UNUSED void *p, curl_off_t dltotal, curl_off_t dlnow, UNUSED curl_off_t ultotal, UNUSED curl_off_t ulnow)
{
curl_off_t progress = 0;
if (dltotal != 0)
progress = ((float)dlnow / dltotal) * 100;
fprintf(stderr, "\rProgress: %3" CURL_FORMAT_CURL_OFF_T "%%", progress);
if (progress == 100) fprintf(stderr, "\r");
return 0;
}
struct MemoryStruct* downloadToRam(const char* URL, long noprogress)
{
CURL* curl_handle;
CURLcode res = CURLE_OK;
if (!isatty(STDERR_FILENO))
noprogress = 1L;
struct MemoryStruct* chunk = malloc(sizeof(struct MemoryStruct));
if (chunk)
{
// if we managed to allocate the chunk lets assume we can allocate at least 1 byte
chunk->memory = malloc(1);
chunk->size = 0;
curl_global_init(CURL_GLOBAL_ALL);
curl_handle = curl_easy_init();
curl_easy_setopt(curl_handle, CURLOPT_URL, URL);
curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, memoryCallback);
curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void*)chunk);
curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, USER_AGENT);
curl_easy_setopt(curl_handle, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl_handle, CURLOPT_XFERINFOFUNCTION, xferinfo);
curl_easy_setopt(curl_handle, CURLOPT_NOPROGRESS, noprogress);
res = curl_easy_perform(curl_handle);
long http_code = 0;
curl_easy_getinfo (curl_handle, CURLINFO_RESPONSE_CODE, &http_code);
if(res != CURLE_OK) {
puts(curl_easy_strerror(res));
return NULL;
}
else if (http_code != 200)
{
#ifdef DEBUG
printf("HTTP Error %li\n", http_code);
#endif
return NULL;
}
curl_easy_cleanup(curl_handle);
curl_global_cleanup();
}
else
{
fprintf(stderr, "Unable to allocate memory\n");
}
return chunk;
}
struct json_object* fetchJSON(const char* URL)
{
struct MemoryStruct* chunk = downloadToRam(URL, 1L);
struct json_object* json = NULL;
if (chunk)
{
json = json_tokener_parse((char*)chunk->memory);
free(chunk->memory);
free(chunk);
}
return json;
}
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