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Dependencies:   mbed

lwip/HTTPServer/HTTPFS.h@0:4570f87afab6, 2011-09-03 (annotated)

Committer:
geiineuville
Date:
Sat Sep 03 09:42:32 2011 +0000
Revision:
0:4570f87afab6
v1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
geiineuville 0:4570f87afab6 1 #ifndef HTTPFILESYSTEM_H
geiineuville 0:4570f87afab6 2 #define HTTPFILESYSTEM_H
geiineuville 0:4570f87afab6 3
geiineuville 0:4570f87afab6 4 #include "mbed.h"
geiineuville 0:4570f87afab6 5
geiineuville 0:4570f87afab6 6 #include "HTTPServer.h"
geiineuville 0:4570f87afab6 7
geiineuville 0:4570f87afab6 8 #define HTTP_BUFFER_SIZE 700
geiineuville 0:4570f87afab6 9 #define FILENAMELANGTH 100
geiineuville 0:4570f87afab6 10
geiineuville 0:4570f87afab6 11 /**
geiineuville 0:4570f87afab6 12 * This class will store the data which are required for an request.
geiineuville 0:4570f87afab6 13 * We are not in every case able to return all data at once, that means we have to store
geiineuville 0:4570f87afab6 14 * the actual level of transmission.
geiineuville 0:4570f87afab6 15 */
geiineuville 0:4570f87afab6 16 class HTTPFileSystemData : public HTTPData {
geiineuville 0:4570f87afab6 17 public:
geiineuville 0:4570f87afab6 18 int fleft;
geiineuville 0:4570f87afab6 19 int bleft;
geiineuville 0:4570f87afab6 20 int offset;
geiineuville 0:4570f87afab6 21 FILE *file;
geiineuville 0:4570f87afab6 22 char buffer[HTTP_BUFFER_SIZE];
geiineuville 0:4570f87afab6 23
geiineuville 0:4570f87afab6 24 virtual ~HTTPFileSystemData() {
geiineuville 0:4570f87afab6 25 if(file) {
geiineuville 0:4570f87afab6 26 fclose(file);
geiineuville 0:4570f87afab6 27 file = 0;
geiineuville 0:4570f87afab6 28 }
geiineuville 0:4570f87afab6 29 }
geiineuville 0:4570f87afab6 30 };
geiineuville 0:4570f87afab6 31
geiineuville 0:4570f87afab6 32 /**
geiineuville 0:4570f87afab6 33 * This class will deliver files form the virtual file system.
geiineuville 0:4570f87afab6 34 * Furthermore it is a simple example how to implement an HTTPHandler for big data requests.
geiineuville 0:4570f87afab6 35 */
geiineuville 0:4570f87afab6 36 class HTTPFileSystemHandler : public HTTPHandler {
geiineuville 0:4570f87afab6 37 public:
geiineuville 0:4570f87afab6 38 /**
geiineuville 0:4570f87afab6 39 * Create a new HTTPFileSzstemHandler.
geiineuville 0:4570f87afab6 40 * @param prefix The Prefix is the URL Proefix in witch the Handler will work.
geiineuville 0:4570f87afab6 41 * @param dir The Prefix will be directly mappt on the dir.
geiineuville 0:4570f87afab6 42 */
geiineuville 0:4570f87afab6 43 HTTPFileSystemHandler(const char *path, const char *dir) : HTTPHandler(path), _dir(dir) {}
geiineuville 0:4570f87afab6 44 HTTPFileSystemHandler(HTTPServer *server, const char *path, const char *dir) : HTTPHandler(path), _dir(dir) { server->addHandler(this); }
geiineuville 0:4570f87afab6 45
geiineuville 0:4570f87afab6 46 private:
geiineuville 0:4570f87afab6 47 /**
geiineuville 0:4570f87afab6 48 * Check if a requested file exists.
geiineuville 0:4570f87afab6 49 * If it exists open it and store the data back in the HTTPConnection.
geiineuville 0:4570f87afab6 50 * We would not store connection specific data into the Handler.
geiineuville 0:4570f87afab6 51 * If the file exists and we cann serve a page return HTTP_OK else HTTP_NotFound.
geiineuville 0:4570f87afab6 52 * @param con The Connection which will be handled.
geiineuville 0:4570f87afab6 53 */
geiineuville 0:4570f87afab6 54 virtual HTTPStatus init(HTTPConnection *con) const {
geiineuville 0:4570f87afab6 55 char filename[FILENAMELANGTH];
geiineuville 0:4570f87afab6 56 HTTPFileSystemData *data = new HTTPFileSystemData();
geiineuville 0:4570f87afab6 57 snprintf(filename, FILENAMELANGTH, "%s%s\0", _dir, con->getURL() + strlen(_prefix));
geiineuville 0:4570f87afab6 58 data->file = fopen(filename, "r");
geiineuville 0:4570f87afab6 59 if(!data->file) {
geiineuville 0:4570f87afab6 60 delete data;
geiineuville 0:4570f87afab6 61 return HTTP_NotFound;
geiineuville 0:4570f87afab6 62 }
geiineuville 0:4570f87afab6 63 data->fleft = fleft(data->file);
geiineuville 0:4570f87afab6 64 data->bleft = 0;
geiineuville 0:4570f87afab6 65 data->offset = 0;
geiineuville 0:4570f87afab6 66
geiineuville 0:4570f87afab6 67 con->data = data;
geiineuville 0:4570f87afab6 68 con->setLength(data->fleft);
geiineuville 0:4570f87afab6 69 loadFromFile(con);
geiineuville 0:4570f87afab6 70 return HTTP_OK;
geiineuville 0:4570f87afab6 71 }
geiineuville 0:4570f87afab6 72
geiineuville 0:4570f87afab6 73 /**
geiineuville 0:4570f87afab6 74 * Send the maximum available data chunk to the Client.
geiineuville 0:4570f87afab6 75 * If it is the last chunk close connection by returning HTTP_SuccessEnded
geiineuville 0:4570f87afab6 76 * @param con The connection to handle
geiineuville 0:4570f87afab6 77 * @param maximum The maximal available sendbuffer size.
geiineuville 0:4570f87afab6 78 * @return HTTP_Success when mor data is available or HTTP_SuccessEnded when the file is complete.
geiineuville 0:4570f87afab6 79 */
geiineuville 0:4570f87afab6 80 virtual HTTPHandle send(HTTPConnection *con, int maximum) const {
geiineuville 0:4570f87afab6 81 HTTPFileSystemData *data = static_cast<HTTPFileSystemData *>(con->data);
geiineuville 0:4570f87afab6 82 err_t err;
geiineuville 0:4570f87afab6 83 u16_t len = min(data->bleft, maximum);
geiineuville 0:4570f87afab6 84 // printf("Send File\n");
geiineuville 0:4570f87afab6 85 if(len) {
geiineuville 0:4570f87afab6 86 do {
geiineuville 0:4570f87afab6 87 err = con->write(
geiineuville 0:4570f87afab6 88 &data->buffer[data->offset], len, (((!data->fleft)&&(data->bleft==len))?
geiineuville 0:4570f87afab6 89 (TCP_WRITE_FLAG_COPY | TCP_WRITE_FLAG_MORE) : (TCP_WRITE_FLAG_COPY)));
geiineuville 0:4570f87afab6 90 if(err == ERR_MEM) {
geiineuville 0:4570f87afab6 91 len /= 2;
geiineuville 0:4570f87afab6 92 }
geiineuville 0:4570f87afab6 93 } while (err == ERR_MEM && len > 1);
geiineuville 0:4570f87afab6 94
geiineuville 0:4570f87afab6 95 if(err == ERR_OK) {
geiineuville 0:4570f87afab6 96 data->offset += len;
geiineuville 0:4570f87afab6 97 data->bleft -= len;
geiineuville 0:4570f87afab6 98 }
geiineuville 0:4570f87afab6 99 }
geiineuville 0:4570f87afab6 100 return loadFromFile(con);
geiineuville 0:4570f87afab6 101 }
geiineuville 0:4570f87afab6 102
geiineuville 0:4570f87afab6 103 /**
geiineuville 0:4570f87afab6 104 * Returns the left size of a file.
geiineuville 0:4570f87afab6 105 * @param fd The filehandler of which we want to know the filesize.
geiineuville 0:4570f87afab6 106 * @return The filesize of fd.
geiineuville 0:4570f87afab6 107 */
geiineuville 0:4570f87afab6 108 long fleft(FILE *fd) const {
geiineuville 0:4570f87afab6 109 long len, cur;
geiineuville 0:4570f87afab6 110 cur = ftell(fd);
geiineuville 0:4570f87afab6 111 fseek(fd, 0, SEEK_END);
geiineuville 0:4570f87afab6 112 len = ftell(fd);
geiineuville 0:4570f87afab6 113 fseek(fd, cur, SEEK_SET);
geiineuville 0:4570f87afab6 114 return len;
geiineuville 0:4570f87afab6 115 }
geiineuville 0:4570f87afab6 116
geiineuville 0:4570f87afab6 117 /**
geiineuville 0:4570f87afab6 118 * Fill the buffer if the buffer is empty.
geiineuville 0:4570f87afab6 119 * If the file is complete close the filehandler and return HTTP_SuccessEnded.
geiineuville 0:4570f87afab6 120 */
geiineuville 0:4570f87afab6 121 HTTPHandle loadFromFile(HTTPConnection *con) const {
geiineuville 0:4570f87afab6 122 HTTPFileSystemData *data = static_cast<HTTPFileSystemData *>(con->data);
geiineuville 0:4570f87afab6 123 if(!data->bleft) {
geiineuville 0:4570f87afab6 124 if(data->fleft) {
geiineuville 0:4570f87afab6 125 int len = fread(&data->buffer[0], sizeof(char), HTTP_BUFFER_SIZE, data->file);
geiineuville 0:4570f87afab6 126 data->fleft -= len;
geiineuville 0:4570f87afab6 127 data->bleft = len;
geiineuville 0:4570f87afab6 128 data->offset = 0;
geiineuville 0:4570f87afab6 129 } else {
geiineuville 0:4570f87afab6 130 if(data->file) {
geiineuville 0:4570f87afab6 131 fclose(data->file);
geiineuville 0:4570f87afab6 132 data->file = 0;
geiineuville 0:4570f87afab6 133 }
geiineuville 0:4570f87afab6 134 return HTTP_SuccessEnded;
geiineuville 0:4570f87afab6 135 }
geiineuville 0:4570f87afab6 136 }
geiineuville 0:4570f87afab6 137 return HTTP_Success;
geiineuville 0:4570f87afab6 138 }
geiineuville 0:4570f87afab6 139
geiineuville 0:4570f87afab6 140 /** The Directory which will replace the prefix of the URL */
geiineuville 0:4570f87afab6 141 const char *_dir;
geiineuville 0:4570f87afab6 142 };
geiineuville 0:4570f87afab6 143
geiineuville 0:4570f87afab6 144 #endif