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#ifndef HTTPDYNAMICPAGE_H
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#define HTTPDYNAMICPAGE_H
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#include "HTTPServer.h"
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/**
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* A datastorage helper for the HTTPDynamicPage class.
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* Stores dynamically created page data and the size left to upload.
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*/
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class HTTPDynamicPageData : public HTTPData {
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public:
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HTTPDynamicPageData()
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: page_free(NULL), page(NULL), size(0), _left(0) {}
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virtual ~HTTPDynamicPageData() {
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if (page_free && page) {
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page_free(page);
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}
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}
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/** Pointer to garbage collection function (for freeing page data)
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* Should be set by callback function to a suitable free() if page is dynamically allocated
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*/
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void (*page_free)(void *page);
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/** Pointer to the page data */
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char *page;
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/** Page data size
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* As long as the page is NULL terminated you don't have to tell the data length.
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* But if you want to send binary data you should tell us the size.
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*/
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int size;
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/** Page data size left for the upload */
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int _left;
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};
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/**
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* This class Provide a Handler to send Static HTTP Pages from the bin file.
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*/
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class HTTPDynamicPage : public HTTPHandler {
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public:
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/**
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* Constructor takes the page path and the page callback function.
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*/
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HTTPDynamicPage(const char *path, HTTPStatus page_fnc(HTTPConnection *con, HTTPDynamicPageData *pd))
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: HTTPHandler(path), _page_fnc(page_fnc) {
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}
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HTTPDynamicPage(HTTPServer *server, const char *path, HTTPStatus page_fnc(HTTPConnection *con, HTTPDynamicPageData *pd))
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: HTTPHandler(path), _page_fnc(page_fnc) {
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server->addHandler(this);
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}
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private:
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/**
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* This Dynamic Page is requested!
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* Prepare a datastorage helper "HTTPDynamicPageData", create the page and store in helper, then initialize remaining data size.
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* And return HTTP_OK if all ok.
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*/
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virtual HTTPStatus init(HTTPConnection *con) const {
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HTTPDynamicPageData *data = new HTTPDynamicPageData();
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con->data = data;
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HTTPStatus status = _page_fnc(con, data); // assigns data->page, data->size and optionally data->page_free
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if (!data->size && data->page)
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data->size = strlen(data->page);
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data->_left = data->size;
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con->setLength(data->size);
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return status;
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}
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/**
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* Send the maximum data out to the client.
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* If the file is complete transmitted close connection by returning HTTP_SuccessEnded
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*/
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virtual HTTPHandle send(HTTPConnection *con, int maximum) const {
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HTTPDynamicPageData *data = static_cast<HTTPDynamicPageData *>(con->data);
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int len = min(maximum, data->_left);
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err_t err;
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do {
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err = con->write((void*)&data->page[data->size - data->_left], len, 1);
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if (err == ERR_MEM) {
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len >>= 1;
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}
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} while(err == ERR_MEM && len > 1);
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if (err == ERR_OK) {
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data->_left -= len;
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}
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return (data->_left) ? HTTP_Success : HTTP_SuccessEnded;
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}
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HTTPStatus (*_page_fnc)(HTTPConnection *con, HTTPDynamicPageData *pd);
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};
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#endif
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Ilya I