mbed unsupported / lwip

A version of LWIP, provided for backwards compatibility.

Dependents:   AA_DemoBoard DemoBoard HelloServerDemo DemoBoard_RangeIndicator ... more

precomp/HTTPServer/HTTPFS.h@0:5e1631496985, 2012-05-08 (annotated)

Committer:
root@mbed.org
Date:
Tue May 08 15:32:10 2012 +0100
Revision:
0:5e1631496985
initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
root@mbed.org 0:5e1631496985 1 #ifndef HTTPFILESYSTEM_H
root@mbed.org 0:5e1631496985 2 #define HTTPFILESYSTEM_H
root@mbed.org 0:5e1631496985 3
root@mbed.org 0:5e1631496985 4 #include "mbed.h"
root@mbed.org 0:5e1631496985 5
root@mbed.org 0:5e1631496985 6 #include "HTTPServer.h"
root@mbed.org 0:5e1631496985 7
root@mbed.org 0:5e1631496985 8 #define HTTP_BUFFER_SIZE 700
root@mbed.org 0:5e1631496985 9 #define FILENAMELANGTH 100
root@mbed.org 0:5e1631496985 10
root@mbed.org 0:5e1631496985 11 /**
root@mbed.org 0:5e1631496985 12 * This class will store the data which are required for an request.
root@mbed.org 0:5e1631496985 13 * We are not in every case able to return all data at once, that means we have to store
root@mbed.org 0:5e1631496985 14 * the actual level of transmission.
root@mbed.org 0:5e1631496985 15 */
root@mbed.org 0:5e1631496985 16 class HTTPFileSystemData : public HTTPData {
root@mbed.org 0:5e1631496985 17 public:
root@mbed.org 0:5e1631496985 18 int fleft;
root@mbed.org 0:5e1631496985 19 int bleft;
root@mbed.org 0:5e1631496985 20 int offset;
root@mbed.org 0:5e1631496985 21 FILE *file;
root@mbed.org 0:5e1631496985 22 char buffer[HTTP_BUFFER_SIZE];
root@mbed.org 0:5e1631496985 23
root@mbed.org 0:5e1631496985 24 virtual ~HTTPFileSystemData() {
root@mbed.org 0:5e1631496985 25 if(file) {
root@mbed.org 0:5e1631496985 26 fclose(file);
root@mbed.org 0:5e1631496985 27 file = 0;
root@mbed.org 0:5e1631496985 28 }
root@mbed.org 0:5e1631496985 29 }
root@mbed.org 0:5e1631496985 30 };
root@mbed.org 0:5e1631496985 31
root@mbed.org 0:5e1631496985 32 /**
root@mbed.org 0:5e1631496985 33 * This class will deliver files form the virtual file system.
root@mbed.org 0:5e1631496985 34 * Furthermore it is a simple example how to implement an HTTPHandler for big data requests.
root@mbed.org 0:5e1631496985 35 */
root@mbed.org 0:5e1631496985 36 class HTTPFileSystemHandler : public HTTPHandler {
root@mbed.org 0:5e1631496985 37 public:
root@mbed.org 0:5e1631496985 38 /**
root@mbed.org 0:5e1631496985 39 * Create a new HTTPFileSzstemHandler.
root@mbed.org 0:5e1631496985 40 * @param prefix The Prefix is the URL Proefix in witch the Handler will work.
root@mbed.org 0:5e1631496985 41 * @param dir The Prefix will be directly mappt on the dir.
root@mbed.org 0:5e1631496985 42 */
root@mbed.org 0:5e1631496985 43 HTTPFileSystemHandler(const char *path, const char *dir) : HTTPHandler(path), _dir(dir) {}
root@mbed.org 0:5e1631496985 44 HTTPFileSystemHandler(HTTPServer *server, const char *path, const char *dir) : HTTPHandler(path), _dir(dir) { server->addHandler(this); }
root@mbed.org 0:5e1631496985 45
root@mbed.org 0:5e1631496985 46 private:
root@mbed.org 0:5e1631496985 47 /**
root@mbed.org 0:5e1631496985 48 * Check if a requested file exists.
root@mbed.org 0:5e1631496985 49 * If it exists open it and store the data back in the HTTPConnection.
root@mbed.org 0:5e1631496985 50 * We would not store connection specific data into the Handler.
root@mbed.org 0:5e1631496985 51 * If the file exists and we cann serve a page return HTTP_OK else HTTP_NotFound.
root@mbed.org 0:5e1631496985 52 * @param con The Connection which will be handled.
root@mbed.org 0:5e1631496985 53 */
root@mbed.org 0:5e1631496985 54 virtual HTTPStatus init(HTTPConnection *con) const {
root@mbed.org 0:5e1631496985 55 char filename[FILENAMELANGTH];
root@mbed.org 0:5e1631496985 56 HTTPFileSystemData *data = new HTTPFileSystemData();
root@mbed.org 0:5e1631496985 57 snprintf(filename, FILENAMELANGTH, "%s%s\0", _dir, con->getURL() + strlen(_prefix));
root@mbed.org 0:5e1631496985 58 data->file = fopen(filename, "r");
root@mbed.org 0:5e1631496985 59 if(!data->file) {
root@mbed.org 0:5e1631496985 60 delete data;
root@mbed.org 0:5e1631496985 61 return HTTP_NotFound;
root@mbed.org 0:5e1631496985 62 }
root@mbed.org 0:5e1631496985 63 data->fleft = fleft(data->file);
root@mbed.org 0:5e1631496985 64 data->bleft = 0;
root@mbed.org 0:5e1631496985 65 data->offset = 0;
root@mbed.org 0:5e1631496985 66
root@mbed.org 0:5e1631496985 67 con->data = data;
root@mbed.org 0:5e1631496985 68 con->setLength(data->fleft);
root@mbed.org 0:5e1631496985 69 loadFromFile(con);
root@mbed.org 0:5e1631496985 70 return HTTP_OK;
root@mbed.org 0:5e1631496985 71 }
root@mbed.org 0:5e1631496985 72
root@mbed.org 0:5e1631496985 73 /**
root@mbed.org 0:5e1631496985 74 * Send the maximum available data chunk to the Client.
root@mbed.org 0:5e1631496985 75 * If it is the last chunk close connection by returning HTTP_SuccessEnded
root@mbed.org 0:5e1631496985 76 * @param con The connection to handle
root@mbed.org 0:5e1631496985 77 * @param maximum The maximal available sendbuffer size.
root@mbed.org 0:5e1631496985 78 * @return HTTP_Success when mor data is available or HTTP_SuccessEnded when the file is complete.
root@mbed.org 0:5e1631496985 79 */
root@mbed.org 0:5e1631496985 80 virtual HTTPHandle send(HTTPConnection *con, int maximum) const {
root@mbed.org 0:5e1631496985 81 HTTPFileSystemData *data = static_cast<HTTPFileSystemData *>(con->data);
root@mbed.org 0:5e1631496985 82 err_t err;
root@mbed.org 0:5e1631496985 83 u16_t len = min(data->bleft, maximum);
root@mbed.org 0:5e1631496985 84 // printf("Send File\n");
root@mbed.org 0:5e1631496985 85 if(len) {
root@mbed.org 0:5e1631496985 86 do {
root@mbed.org 0:5e1631496985 87 err = con->write(
root@mbed.org 0:5e1631496985 88 &data->buffer[data->offset], len, (((!data->fleft)&&(data->bleft==len))?
root@mbed.org 0:5e1631496985 89 (TCP_WRITE_FLAG_COPY | TCP_WRITE_FLAG_MORE) : (TCP_WRITE_FLAG_COPY)));
root@mbed.org 0:5e1631496985 90 if(err == ERR_MEM) {
root@mbed.org 0:5e1631496985 91 len /= 2;
root@mbed.org 0:5e1631496985 92 }
root@mbed.org 0:5e1631496985 93 } while (err == ERR_MEM && len > 1);
root@mbed.org 0:5e1631496985 94
root@mbed.org 0:5e1631496985 95 if(err == ERR_OK) {
root@mbed.org 0:5e1631496985 96 data->offset += len;
root@mbed.org 0:5e1631496985 97 data->bleft -= len;
root@mbed.org 0:5e1631496985 98 }
root@mbed.org 0:5e1631496985 99 }
root@mbed.org 0:5e1631496985 100 return loadFromFile(con);
root@mbed.org 0:5e1631496985 101 }
root@mbed.org 0:5e1631496985 102
root@mbed.org 0:5e1631496985 103 /**
root@mbed.org 0:5e1631496985 104 * Returns the left size of a file.
root@mbed.org 0:5e1631496985 105 * @param fd The filehandler of which we want to know the filesize.
root@mbed.org 0:5e1631496985 106 * @return The filesize of fd.
root@mbed.org 0:5e1631496985 107 */
root@mbed.org 0:5e1631496985 108 long fleft(FILE *fd) const {
root@mbed.org 0:5e1631496985 109 long len, cur;
root@mbed.org 0:5e1631496985 110 cur = ftell(fd);
root@mbed.org 0:5e1631496985 111 fseek(fd, 0, SEEK_END);
root@mbed.org 0:5e1631496985 112 len = ftell(fd);
root@mbed.org 0:5e1631496985 113 fseek(fd, cur, SEEK_SET);
root@mbed.org 0:5e1631496985 114 return len;
root@mbed.org 0:5e1631496985 115 }
root@mbed.org 0:5e1631496985 116
root@mbed.org 0:5e1631496985 117 /**
root@mbed.org 0:5e1631496985 118 * Fill the buffer if the buffer is empty.
root@mbed.org 0:5e1631496985 119 * If the file is complete close the filehandler and return HTTP_SuccessEnded.
root@mbed.org 0:5e1631496985 120 */
root@mbed.org 0:5e1631496985 121 HTTPHandle loadFromFile(HTTPConnection *con) const {
root@mbed.org 0:5e1631496985 122 HTTPFileSystemData *data = static_cast<HTTPFileSystemData *>(con->data);
root@mbed.org 0:5e1631496985 123 if(!data->bleft) {
root@mbed.org 0:5e1631496985 124 if(data->fleft) {
root@mbed.org 0:5e1631496985 125 int len = fread(&data->buffer[0], sizeof(char), HTTP_BUFFER_SIZE, data->file);
root@mbed.org 0:5e1631496985 126 data->fleft -= len;
root@mbed.org 0:5e1631496985 127 data->bleft = len;
root@mbed.org 0:5e1631496985 128 data->offset = 0;
root@mbed.org 0:5e1631496985 129 } else {
root@mbed.org 0:5e1631496985 130 if(data->file) {
root@mbed.org 0:5e1631496985 131 fclose(data->file);
root@mbed.org 0:5e1631496985 132 data->file = 0;
root@mbed.org 0:5e1631496985 133 }
root@mbed.org 0:5e1631496985 134 return HTTP_SuccessEnded;
root@mbed.org 0:5e1631496985 135 }
root@mbed.org 0:5e1631496985 136 }
root@mbed.org 0:5e1631496985 137 return HTTP_Success;
root@mbed.org 0:5e1631496985 138 }
root@mbed.org 0:5e1631496985 139
root@mbed.org 0:5e1631496985 140 /** The Directory which will replace the prefix of the URL */
root@mbed.org 0:5e1631496985 141 const char *_dir;
root@mbed.org 0:5e1631496985 142 };
root@mbed.org 0:5e1631496985 143
root@mbed.org 0:5e1631496985 144 #endif