Rod Coleman / lwip-mbed-2010

Port of LwIP performed by Ralf in 2010. Not recommended for use with recent mbed libraries, but good demos of raw LwIP possible

Dependents:   LwIP_raw_API_serverExample tiny-dtls

HTTPServer/HTTPFS.h@0:0791c1fece8e, 2012-09-18 (annotated)

Committer:
RodColeman
Date:
Tue Sep 18 14:41:24 2012 +0000
Revision:
0:0791c1fece8e
[mbed] converted /Eth_TCP_Wei_Server/lwip

Who changed what in which revision?

UserRevisionLine numberNew contents of line
RodColeman 0:0791c1fece8e 1 #ifndef HTTPFILESYSTEM_H
RodColeman 0:0791c1fece8e 2 #define HTTPFILESYSTEM_H
RodColeman 0:0791c1fece8e 3
RodColeman 0:0791c1fece8e 4 #include "mbed.h"
RodColeman 0:0791c1fece8e 5
RodColeman 0:0791c1fece8e 6 #include "HTTPServer.h"
RodColeman 0:0791c1fece8e 7
RodColeman 0:0791c1fece8e 8 #define HTTP_BUFFER_SIZE 700
RodColeman 0:0791c1fece8e 9 #define FILENAMELANGTH 100
RodColeman 0:0791c1fece8e 10
RodColeman 0:0791c1fece8e 11 /**
RodColeman 0:0791c1fece8e 12 * This class will store the data which are required for an request.
RodColeman 0:0791c1fece8e 13 * We are not in every case able to return all data at once, that means we have to store
RodColeman 0:0791c1fece8e 14 * the actual level of transmission.
RodColeman 0:0791c1fece8e 15 */
RodColeman 0:0791c1fece8e 16 class HTTPFileSystemData : public HTTPData {
RodColeman 0:0791c1fece8e 17 public:
RodColeman 0:0791c1fece8e 18 int fleft;
RodColeman 0:0791c1fece8e 19 int bleft;
RodColeman 0:0791c1fece8e 20 int offset;
RodColeman 0:0791c1fece8e 21 FILE *file;
RodColeman 0:0791c1fece8e 22 char buffer[HTTP_BUFFER_SIZE];
RodColeman 0:0791c1fece8e 23
RodColeman 0:0791c1fece8e 24 virtual ~HTTPFileSystemData() {
RodColeman 0:0791c1fece8e 25 if(file) {
RodColeman 0:0791c1fece8e 26 fclose(file);
RodColeman 0:0791c1fece8e 27 file = 0;
RodColeman 0:0791c1fece8e 28 }
RodColeman 0:0791c1fece8e 29 }
RodColeman 0:0791c1fece8e 30 };
RodColeman 0:0791c1fece8e 31
RodColeman 0:0791c1fece8e 32 /**
RodColeman 0:0791c1fece8e 33 * This class will deliver files form the virtual file system.
RodColeman 0:0791c1fece8e 34 * Furthermore it is a simple example how to implement an HTTPHandler for big data requests.
RodColeman 0:0791c1fece8e 35 */
RodColeman 0:0791c1fece8e 36 class HTTPFileSystemHandler : public HTTPHandler {
RodColeman 0:0791c1fece8e 37 public:
RodColeman 0:0791c1fece8e 38 /**
RodColeman 0:0791c1fece8e 39 * Create a new HTTPFileSzstemHandler.
RodColeman 0:0791c1fece8e 40 * @param prefix The Prefix is the URL Proefix in witch the Handler will work.
RodColeman 0:0791c1fece8e 41 * @param dir The Prefix will be directly mappt on the dir.
RodColeman 0:0791c1fece8e 42 */
RodColeman 0:0791c1fece8e 43 HTTPFileSystemHandler(const char *path, const char *dir) : HTTPHandler(path), _dir(dir) {}
RodColeman 0:0791c1fece8e 44 HTTPFileSystemHandler(HTTPServer *server, const char *path, const char *dir) : HTTPHandler(path), _dir(dir) { server->addHandler(this); }
RodColeman 0:0791c1fece8e 45
RodColeman 0:0791c1fece8e 46 private:
RodColeman 0:0791c1fece8e 47 /**
RodColeman 0:0791c1fece8e 48 * Check if a requested file exists.
RodColeman 0:0791c1fece8e 49 * If it exists open it and store the data back in the HTTPConnection.
RodColeman 0:0791c1fece8e 50 * We would not store connection specific data into the Handler.
RodColeman 0:0791c1fece8e 51 * If the file exists and we cann serve a page return HTTP_OK else HTTP_NotFound.
RodColeman 0:0791c1fece8e 52 * @param con The Connection which will be handled.
RodColeman 0:0791c1fece8e 53 */
RodColeman 0:0791c1fece8e 54 virtual HTTPStatus init(HTTPConnection *con) const {
RodColeman 0:0791c1fece8e 55 char filename[FILENAMELANGTH];
RodColeman 0:0791c1fece8e 56 HTTPFileSystemData *data = new HTTPFileSystemData();
RodColeman 0:0791c1fece8e 57 snprintf(filename, FILENAMELANGTH, "%s%s\0", _dir, con->getURL() + strlen(_prefix));
RodColeman 0:0791c1fece8e 58 data->file = fopen(filename, "r");
RodColeman 0:0791c1fece8e 59 if(!data->file) {
RodColeman 0:0791c1fece8e 60 delete data;
RodColeman 0:0791c1fece8e 61 return HTTP_NotFound;
RodColeman 0:0791c1fece8e 62 }
RodColeman 0:0791c1fece8e 63 data->fleft = fleft(data->file);
RodColeman 0:0791c1fece8e 64 data->bleft = 0;
RodColeman 0:0791c1fece8e 65 data->offset = 0;
RodColeman 0:0791c1fece8e 66
RodColeman 0:0791c1fece8e 67 con->data = data;
RodColeman 0:0791c1fece8e 68 con->setLength(data->fleft);
RodColeman 0:0791c1fece8e 69 loadFromFile(con);
RodColeman 0:0791c1fece8e 70 return HTTP_OK;
RodColeman 0:0791c1fece8e 71 }
RodColeman 0:0791c1fece8e 72
RodColeman 0:0791c1fece8e 73 /**
RodColeman 0:0791c1fece8e 74 * Send the maximum available data chunk to the Client.
RodColeman 0:0791c1fece8e 75 * If it is the last chunk close connection by returning HTTP_SuccessEnded
RodColeman 0:0791c1fece8e 76 * @param con The connection to handle
RodColeman 0:0791c1fece8e 77 * @param maximum The maximal available sendbuffer size.
RodColeman 0:0791c1fece8e 78 * @return HTTP_Success when mor data is available or HTTP_SuccessEnded when the file is complete.
RodColeman 0:0791c1fece8e 79 */
RodColeman 0:0791c1fece8e 80 virtual HTTPHandle send(HTTPConnection *con, int maximum) const {
RodColeman 0:0791c1fece8e 81 HTTPFileSystemData *data = static_cast<HTTPFileSystemData *>(con->data);
RodColeman 0:0791c1fece8e 82 err_t err;
RodColeman 0:0791c1fece8e 83 u16_t len = min(data->bleft, maximum);
RodColeman 0:0791c1fece8e 84 // printf("Send File\n");
RodColeman 0:0791c1fece8e 85 if(len) {
RodColeman 0:0791c1fece8e 86 do {
RodColeman 0:0791c1fece8e 87 err = con->write(
RodColeman 0:0791c1fece8e 88 &data->buffer[data->offset], len, (((!data->fleft)&&(data->bleft==len))?
RodColeman 0:0791c1fece8e 89 (TCP_WRITE_FLAG_COPY | TCP_WRITE_FLAG_MORE) : (TCP_WRITE_FLAG_COPY)));
RodColeman 0:0791c1fece8e 90 if(err == ERR_MEM) {
RodColeman 0:0791c1fece8e 91 len /= 2;
RodColeman 0:0791c1fece8e 92 }
RodColeman 0:0791c1fece8e 93 } while (err == ERR_MEM && len > 1);
RodColeman 0:0791c1fece8e 94
RodColeman 0:0791c1fece8e 95 if(err == ERR_OK) {
RodColeman 0:0791c1fece8e 96 data->offset += len;
RodColeman 0:0791c1fece8e 97 data->bleft -= len;
RodColeman 0:0791c1fece8e 98 }
RodColeman 0:0791c1fece8e 99 }
RodColeman 0:0791c1fece8e 100 return loadFromFile(con);
RodColeman 0:0791c1fece8e 101 }
RodColeman 0:0791c1fece8e 102
RodColeman 0:0791c1fece8e 103 /**
RodColeman 0:0791c1fece8e 104 * Returns the left size of a file.
RodColeman 0:0791c1fece8e 105 * @param fd The filehandler of which we want to know the filesize.
RodColeman 0:0791c1fece8e 106 * @return The filesize of fd.
RodColeman 0:0791c1fece8e 107 */
RodColeman 0:0791c1fece8e 108 long fleft(FILE *fd) const {
RodColeman 0:0791c1fece8e 109 long len, cur;
RodColeman 0:0791c1fece8e 110 cur = ftell(fd);
RodColeman 0:0791c1fece8e 111 fseek(fd, 0, SEEK_END);
RodColeman 0:0791c1fece8e 112 len = ftell(fd);
RodColeman 0:0791c1fece8e 113 fseek(fd, cur, SEEK_SET);
RodColeman 0:0791c1fece8e 114 return len;
RodColeman 0:0791c1fece8e 115 }
RodColeman 0:0791c1fece8e 116
RodColeman 0:0791c1fece8e 117 /**
RodColeman 0:0791c1fece8e 118 * Fill the buffer if the buffer is empty.
RodColeman 0:0791c1fece8e 119 * If the file is complete close the filehandler and return HTTP_SuccessEnded.
RodColeman 0:0791c1fece8e 120 */
RodColeman 0:0791c1fece8e 121 HTTPHandle loadFromFile(HTTPConnection *con) const {
RodColeman 0:0791c1fece8e 122 HTTPFileSystemData *data = static_cast<HTTPFileSystemData *>(con->data);
RodColeman 0:0791c1fece8e 123 if(!data->bleft) {
RodColeman 0:0791c1fece8e 124 if(data->fleft) {
RodColeman 0:0791c1fece8e 125 int len = fread(&data->buffer[0], sizeof(char), HTTP_BUFFER_SIZE, data->file);
RodColeman 0:0791c1fece8e 126 data->fleft -= len;
RodColeman 0:0791c1fece8e 127 data->bleft = len;
RodColeman 0:0791c1fece8e 128 data->offset = 0;
RodColeman 0:0791c1fece8e 129 } else {
RodColeman 0:0791c1fece8e 130 if(data->file) {
RodColeman 0:0791c1fece8e 131 fclose(data->file);
RodColeman 0:0791c1fece8e 132 data->file = 0;
RodColeman 0:0791c1fece8e 133 }
RodColeman 0:0791c1fece8e 134 return HTTP_SuccessEnded;
RodColeman 0:0791c1fece8e 135 }
RodColeman 0:0791c1fece8e 136 }
RodColeman 0:0791c1fece8e 137 return HTTP_Success;
RodColeman 0:0791c1fece8e 138 }
RodColeman 0:0791c1fece8e 139
RodColeman 0:0791c1fece8e 140 /** The Directory which will replace the prefix of the URL */
RodColeman 0:0791c1fece8e 141 const char *_dir;
RodColeman 0:0791c1fece8e 142 };
RodColeman 0:0791c1fece8e 143
RodColeman 0:0791c1fece8e 144 #endif