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Dependencies:   mbed

HTTPDynamicPage.h@0:441400ffd086, 2011-09-02 (annotated)

Committer:
geiineuville
Date:
Fri Sep 02 08:36:24 2011 +0000
Revision:
0:441400ffd086
V0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
geiineuville 0:441400ffd086 1 #ifndef HTTPDYNAMICPAGE_H
geiineuville 0:441400ffd086 2 #define HTTPDYNAMICPAGE_H
geiineuville 0:441400ffd086 3
geiineuville 0:441400ffd086 4 #include "HTTPServer.h"
geiineuville 0:441400ffd086 5
geiineuville 0:441400ffd086 6 /**
geiineuville 0:441400ffd086 7 * A datastorage helper for the HTTPDynamicPage class.
geiineuville 0:441400ffd086 8 * Stores dynamically created page data and the size left to upload.
geiineuville 0:441400ffd086 9 */
geiineuville 0:441400ffd086 10 class HTTPDynamicPageData : public HTTPData {
geiineuville 0:441400ffd086 11 public:
geiineuville 0:441400ffd086 12 HTTPDynamicPageData()
geiineuville 0:441400ffd086 13 : page_free(NULL), page(NULL), size(0), _left(0) {}
geiineuville 0:441400ffd086 14 virtual ~HTTPDynamicPageData() {
geiineuville 0:441400ffd086 15 if (page_free && page) {
geiineuville 0:441400ffd086 16 page_free(page);
geiineuville 0:441400ffd086 17 }
geiineuville 0:441400ffd086 18 }
geiineuville 0:441400ffd086 19
geiineuville 0:441400ffd086 20 /** Pointer to garbage collection function (for freeing page data)
geiineuville 0:441400ffd086 21 * Should be set by callback function to a suitable free() if page is dynamically allocated
geiineuville 0:441400ffd086 22 */
geiineuville 0:441400ffd086 23 void (*page_free)(void *page);
geiineuville 0:441400ffd086 24
geiineuville 0:441400ffd086 25 /** Pointer to the page data */
geiineuville 0:441400ffd086 26 char *page;
geiineuville 0:441400ffd086 27
geiineuville 0:441400ffd086 28 /** Page data size
geiineuville 0:441400ffd086 29 * As long as the page is NULL terminated you don't have to tell the data length.
geiineuville 0:441400ffd086 30 * But if you want to send binary data you should tell us the size.
geiineuville 0:441400ffd086 31 */
geiineuville 0:441400ffd086 32 int size;
geiineuville 0:441400ffd086 33
geiineuville 0:441400ffd086 34 /** Page data size left for the upload */
geiineuville 0:441400ffd086 35 int _left;
geiineuville 0:441400ffd086 36 };
geiineuville 0:441400ffd086 37
geiineuville 0:441400ffd086 38 /**
geiineuville 0:441400ffd086 39 * This class Provide a Handler to send Static HTTP Pages from the bin file.
geiineuville 0:441400ffd086 40 */
geiineuville 0:441400ffd086 41 class HTTPDynamicPage : public HTTPHandler {
geiineuville 0:441400ffd086 42 public:
geiineuville 0:441400ffd086 43 /**
geiineuville 0:441400ffd086 44 * Constructor takes the page path and the page callback function.
geiineuville 0:441400ffd086 45 */
geiineuville 0:441400ffd086 46 HTTPDynamicPage(const char *path, HTTPStatus page_fnc(HTTPConnection *con, HTTPDynamicPageData *pd))
geiineuville 0:441400ffd086 47 : HTTPHandler(path), _page_fnc(page_fnc) {
geiineuville 0:441400ffd086 48 }
geiineuville 0:441400ffd086 49
geiineuville 0:441400ffd086 50 HTTPDynamicPage(HTTPServer *server, const char *path, HTTPStatus page_fnc(HTTPConnection *con, HTTPDynamicPageData *pd))
geiineuville 0:441400ffd086 51 : HTTPHandler(path), _page_fnc(page_fnc) {
geiineuville 0:441400ffd086 52 server->addHandler(this);
geiineuville 0:441400ffd086 53 }
geiineuville 0:441400ffd086 54
geiineuville 0:441400ffd086 55 private:
geiineuville 0:441400ffd086 56 /**
geiineuville 0:441400ffd086 57 * This Dynamic Page is requested!
geiineuville 0:441400ffd086 58 * Prepare a datastorage helper "HTTPDynamicPageData", create the page and store in helper, then initialize remaining data size.
geiineuville 0:441400ffd086 59 * And return HTTP_OK if all ok.
geiineuville 0:441400ffd086 60 */
geiineuville 0:441400ffd086 61 virtual HTTPStatus init(HTTPConnection *con) const {
geiineuville 0:441400ffd086 62 HTTPDynamicPageData *data = new HTTPDynamicPageData();
geiineuville 0:441400ffd086 63 con->data = data;
geiineuville 0:441400ffd086 64 HTTPStatus status = _page_fnc(con, data); // assigns data->page, data->size and optionally data->page_free
geiineuville 0:441400ffd086 65 if (!data->size && data->page)
geiineuville 0:441400ffd086 66 data->size = strlen(data->page);
geiineuville 0:441400ffd086 67 data->_left = data->size;
geiineuville 0:441400ffd086 68 con->setLength(data->size);
geiineuville 0:441400ffd086 69 return status;
geiineuville 0:441400ffd086 70 }
geiineuville 0:441400ffd086 71
geiineuville 0:441400ffd086 72 /**
geiineuville 0:441400ffd086 73 * Send the maximum data out to the client.
geiineuville 0:441400ffd086 74 * If the file is complete transmitted close connection by returning HTTP_SuccessEnded
geiineuville 0:441400ffd086 75 */
geiineuville 0:441400ffd086 76 virtual HTTPHandle send(HTTPConnection *con, int maximum) const {
geiineuville 0:441400ffd086 77 HTTPDynamicPageData *data = static_cast<HTTPDynamicPageData *>(con->data);
geiineuville 0:441400ffd086 78 int len = min(maximum, data->_left);
geiineuville 0:441400ffd086 79 err_t err;
geiineuville 0:441400ffd086 80
geiineuville 0:441400ffd086 81 do {
geiineuville 0:441400ffd086 82 err = con->write((void*)&data->page[data->size - data->_left], len, 1);
geiineuville 0:441400ffd086 83 if (err == ERR_MEM) {
geiineuville 0:441400ffd086 84 len >>= 1;
geiineuville 0:441400ffd086 85 }
geiineuville 0:441400ffd086 86 } while(err == ERR_MEM && len > 1);
geiineuville 0:441400ffd086 87 if (err == ERR_OK) {
geiineuville 0:441400ffd086 88 data->_left -= len;
geiineuville 0:441400ffd086 89 }
geiineuville 0:441400ffd086 90 return (data->_left) ? HTTP_Success : HTTP_SuccessEnded;
geiineuville 0:441400ffd086 91 }
geiineuville 0:441400ffd086 92
geiineuville 0:441400ffd086 93 HTTPStatus (*_page_fnc)(HTTPConnection *con, HTTPDynamicPageData *pd);
geiineuville 0:441400ffd086 94 };
geiineuville 0:441400ffd086 95
geiineuville 0:441400ffd086 96 #endif