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/* Module: io_layer.c
Purpose: IO Layer for Internet communication using libcurl
Author: leecher
Date: 30.08.2009
*/
#include <curl/curl.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include "fifo.h"
#include "io_layer.h"
typedef struct
{
IOLAYER vtbl;
CURL *hCurl;
TYP_FIFO *hResult;
char szErrorBuf[CURL_ERROR_SIZE+1];
} IOLAYER_INST;
static void IoLayer_Exit (IOLAYER *hPIO);
static char *IoLayer_Post(IOLAYER *hPIO, char *pszUrl, char *pszPostFields, unsigned int cbPostFields, unsigned int *pdwLength);
static char *IoLayer_Get(IOLAYER *hPIO, char *pszUrl, unsigned int *pdwLength);
static void IoLayer_Cancel(IOLAYER *hIO);
static char *IoLayer_GetLastError(IOLAYER *hIO);
static char *IoLayer_EscapeString(IOLAYER *hIO, char *pszData);
static void IoLayer_FreeEscapeString(char *pszData);
static size_t add_data(char *data, size_t size, size_t nmemb, void *ctx);
// -----------------------------------------------------------------------------
// Interface
// -----------------------------------------------------------------------------
IOLAYER *IoLayerCURL_Init(void)
{
IOLAYER_INST *hIO;
if (!(hIO = calloc(1, sizeof(IOLAYER_INST))))
return NULL;
if (!(hIO->hCurl = curl_easy_init()))
{
free (hIO);
return NULL;
}
if (!(hIO->hResult = Fifo_Init(1024)))
{
IoLayer_Exit((IOLAYER*)hIO);
return NULL;
}
curl_easy_setopt(hIO->hCurl, CURLOPT_USERAGENT, "XMLHttpRequest/1.0");
curl_easy_setopt(hIO->hCurl, CURLOPT_HEADER, 0);
curl_easy_setopt(hIO->hCurl, CURLOPT_AUTOREFERER, 1);
// curl_easy_setopt(hRq->hCurl, CURLOPT_RETURNTRANSFER, 1);
curl_easy_setopt(hIO->hCurl, CURLOPT_SSL_VERIFYPEER, 0);
curl_easy_setopt(hIO->hCurl, CURLOPT_SSL_VERIFYHOST, 0);
curl_easy_setopt(hIO->hCurl, CURLOPT_ERRORBUFFER, hIO->szErrorBuf);
curl_easy_setopt(hIO->hCurl, CURLOPT_COOKIEFILE, "cookies.txt");
curl_easy_setopt(hIO->hCurl, CURLOPT_COOKIEJAR, "cookies.txt");
curl_easy_setopt(hIO->hCurl, CURLOPT_WRITEFUNCTION, add_data);
curl_easy_setopt(hIO->hCurl, CURLOPT_FILE, hIO);
// Init Vtbl
hIO->vtbl.Exit = IoLayer_Exit;
hIO->vtbl.Post = IoLayer_Post;
hIO->vtbl.Get = IoLayer_Get;
hIO->vtbl.Cancel = IoLayer_Cancel;
hIO->vtbl.GetLastError = IoLayer_GetLastError;
hIO->vtbl.EscapeString = IoLayer_EscapeString;
hIO->vtbl.FreeEscapeString = IoLayer_FreeEscapeString;
return (IOLAYER*)hIO;
}
// -----------------------------------------------------------------------------
static void IoLayer_Exit (IOLAYER *hPIO)
{
IOLAYER_INST *hIO = (IOLAYER_INST*)hPIO;
if (hIO->hCurl) curl_easy_cleanup(hIO->hCurl);
if (hIO->hResult) Fifo_Exit(hIO->hResult);
free (hIO);
}
// -----------------------------------------------------------------------------
static char *IoLayer_Post(IOLAYER *hPIO, char *pszUrl, char *pszPostFields, unsigned int cbPostFields, unsigned int *pdwLength)
{
IOLAYER_INST *hIO = (IOLAYER_INST*)hPIO;
curl_easy_setopt(hIO->hCurl, CURLOPT_POST, 1);
curl_easy_setopt(hIO->hCurl, CURLOPT_URL, pszUrl);
curl_easy_setopt(hIO->hCurl, CURLOPT_POSTFIELDS, pszPostFields);
curl_easy_setopt(hIO->hCurl, CURLOPT_POSTFIELDSIZE, cbPostFields);
if (curl_easy_perform(hIO->hCurl)) return NULL;
if (!pdwLength)
{
// Get string
Fifo_Add (hIO->hResult, "", 1);
return Fifo_Get (hIO->hResult, NULL);
}
else
{
// Get binary, return size of buffer
*pdwLength = (unsigned int)-1;
return Fifo_Get (hIO->hResult, pdwLength);
}
}
// -----------------------------------------------------------------------------
static char *IoLayer_Get(IOLAYER *hPIO, char *pszUrl, unsigned int *pdwLength)
{
IOLAYER_INST *hIO = (IOLAYER_INST*)hPIO;
curl_easy_setopt(hIO->hCurl, CURLOPT_POST, 0);
curl_easy_setopt(hIO->hCurl, CURLOPT_URL, pszUrl);
if (curl_easy_perform(hIO->hCurl)) return NULL;
if (!pdwLength)
{
// Get string
Fifo_Add (hIO->hResult, "", 1);
return Fifo_Get (hIO->hResult, NULL);
}
else
{
// Get binary, return size of buffer
*pdwLength = (unsigned int)-1;
return Fifo_Get (hIO->hResult, pdwLength);
}
}
// -----------------------------------------------------------------------------
static void IoLayer_Cancel(IOLAYER *hIO)
{
// FIXME: Currently not implemented
}
// -----------------------------------------------------------------------------
static char *IoLayer_GetLastError(IOLAYER *hIO)
{
return ((IOLAYER_INST*)hIO)->szErrorBuf;
}
// -----------------------------------------------------------------------------
static char *IoLayer_EscapeString(IOLAYER *hIO, char *pszData)
{
return curl_easy_escape(((IOLAYER_INST*)hIO)->hCurl, pszData, 0);
}
// -----------------------------------------------------------------------------
static void IoLayer_FreeEscapeString(char *pszData)
{
curl_free(pszData);
}
// -----------------------------------------------------------------------------
// Static
// -----------------------------------------------------------------------------
static size_t add_data(char *data, size_t size, size_t nmemb, void *ctx)
{
IOLAYER_INST *hIO = (IOLAYER_INST*)ctx;
if (Fifo_Add(hIO->hResult, data, size * nmemb)) return size * nmemb;
return 0;
}
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