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Dependencies:   mbed

lwip/HTTPServer/HTTPFS.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 HTTPFILESYSTEM_H
geiineuville 0:441400ffd086 2 #define HTTPFILESYSTEM_H
geiineuville 0:441400ffd086 3
geiineuville 0:441400ffd086 4 #include "mbed.h"
geiineuville 0:441400ffd086 5
geiineuville 0:441400ffd086 6 #include "HTTPServer.h"
geiineuville 0:441400ffd086 7
geiineuville 0:441400ffd086 8 #define HTTP_BUFFER_SIZE 700
geiineuville 0:441400ffd086 9 #define FILENAMELANGTH 100
geiineuville 0:441400ffd086 10
geiineuville 0:441400ffd086 11 /**
geiineuville 0:441400ffd086 12 * This class will store the data which are required for an request.
geiineuville 0:441400ffd086 13 * We are not in every case able to return all data at once, that means we have to store
geiineuville 0:441400ffd086 14 * the actual level of transmission.
geiineuville 0:441400ffd086 15 */
geiineuville 0:441400ffd086 16 class HTTPFileSystemData : public HTTPData {
geiineuville 0:441400ffd086 17 public:
geiineuville 0:441400ffd086 18 int fleft;
geiineuville 0:441400ffd086 19 int bleft;
geiineuville 0:441400ffd086 20 int offset;
geiineuville 0:441400ffd086 21 FILE *file;
geiineuville 0:441400ffd086 22 char buffer[HTTP_BUFFER_SIZE];
geiineuville 0:441400ffd086 23
geiineuville 0:441400ffd086 24 virtual ~HTTPFileSystemData() {
geiineuville 0:441400ffd086 25 if(file) {
geiineuville 0:441400ffd086 26 fclose(file);
geiineuville 0:441400ffd086 27 file = 0;
geiineuville 0:441400ffd086 28 }
geiineuville 0:441400ffd086 29 }
geiineuville 0:441400ffd086 30 };
geiineuville 0:441400ffd086 31
geiineuville 0:441400ffd086 32 /**
geiineuville 0:441400ffd086 33 * This class will deliver files form the virtual file system.
geiineuville 0:441400ffd086 34 * Furthermore it is a simple example how to implement an HTTPHandler for big data requests.
geiineuville 0:441400ffd086 35 */
geiineuville 0:441400ffd086 36 class HTTPFileSystemHandler : public HTTPHandler {
geiineuville 0:441400ffd086 37 public:
geiineuville 0:441400ffd086 38 /**
geiineuville 0:441400ffd086 39 * Create a new HTTPFileSzstemHandler.
geiineuville 0:441400ffd086 40 * @param prefix The Prefix is the URL Proefix in witch the Handler will work.
geiineuville 0:441400ffd086 41 * @param dir The Prefix will be directly mappt on the dir.
geiineuville 0:441400ffd086 42 */
geiineuville 0:441400ffd086 43 HTTPFileSystemHandler(const char *path, const char *dir) : HTTPHandler(path), _dir(dir) {}
geiineuville 0:441400ffd086 44 HTTPFileSystemHandler(HTTPServer *server, const char *path, const char *dir) : HTTPHandler(path), _dir(dir) { server->addHandler(this); }
geiineuville 0:441400ffd086 45
geiineuville 0:441400ffd086 46 private:
geiineuville 0:441400ffd086 47 /**
geiineuville 0:441400ffd086 48 * Check if a requested file exists.
geiineuville 0:441400ffd086 49 * If it exists open it and store the data back in the HTTPConnection.
geiineuville 0:441400ffd086 50 * We would not store connection specific data into the Handler.
geiineuville 0:441400ffd086 51 * If the file exists and we cann serve a page return HTTP_OK else HTTP_NotFound.
geiineuville 0:441400ffd086 52 * @param con The Connection which will be handled.
geiineuville 0:441400ffd086 53 */
geiineuville 0:441400ffd086 54 virtual HTTPStatus init(HTTPConnection *con) const {
geiineuville 0:441400ffd086 55 char filename[FILENAMELANGTH];
geiineuville 0:441400ffd086 56 HTTPFileSystemData *data = new HTTPFileSystemData();
geiineuville 0:441400ffd086 57 snprintf(filename, FILENAMELANGTH, "%s%s\0", _dir, con->getURL() + strlen(_prefix));
geiineuville 0:441400ffd086 58 data->file = fopen(filename, "r");
geiineuville 0:441400ffd086 59 if(!data->file) {
geiineuville 0:441400ffd086 60 delete data;
geiineuville 0:441400ffd086 61 return HTTP_NotFound;
geiineuville 0:441400ffd086 62 }
geiineuville 0:441400ffd086 63 data->fleft = fleft(data->file);
geiineuville 0:441400ffd086 64 data->bleft = 0;
geiineuville 0:441400ffd086 65 data->offset = 0;
geiineuville 0:441400ffd086 66
geiineuville 0:441400ffd086 67 con->data = data;
geiineuville 0:441400ffd086 68 con->setLength(data->fleft);
geiineuville 0:441400ffd086 69 loadFromFile(con);
geiineuville 0:441400ffd086 70 return HTTP_OK;
geiineuville 0:441400ffd086 71 }
geiineuville 0:441400ffd086 72
geiineuville 0:441400ffd086 73 /**
geiineuville 0:441400ffd086 74 * Send the maximum available data chunk to the Client.
geiineuville 0:441400ffd086 75 * If it is the last chunk close connection by returning HTTP_SuccessEnded
geiineuville 0:441400ffd086 76 * @param con The connection to handle
geiineuville 0:441400ffd086 77 * @param maximum The maximal available sendbuffer size.
geiineuville 0:441400ffd086 78 * @return HTTP_Success when mor data is available or HTTP_SuccessEnded when the file is complete.
geiineuville 0:441400ffd086 79 */
geiineuville 0:441400ffd086 80 virtual HTTPHandle send(HTTPConnection *con, int maximum) const {
geiineuville 0:441400ffd086 81 HTTPFileSystemData *data = static_cast<HTTPFileSystemData *>(con->data);
geiineuville 0:441400ffd086 82 err_t err;
geiineuville 0:441400ffd086 83 u16_t len = min(data->bleft, maximum);
geiineuville 0:441400ffd086 84 // printf("Send File\n");
geiineuville 0:441400ffd086 85 if(len) {
geiineuville 0:441400ffd086 86 do {
geiineuville 0:441400ffd086 87 err = con->write(
geiineuville 0:441400ffd086 88 &data->buffer[data->offset], len, (((!data->fleft)&&(data->bleft==len))?
geiineuville 0:441400ffd086 89 (TCP_WRITE_FLAG_COPY | TCP_WRITE_FLAG_MORE) : (TCP_WRITE_FLAG_COPY)));
geiineuville 0:441400ffd086 90 if(err == ERR_MEM) {
geiineuville 0:441400ffd086 91 len /= 2;
geiineuville 0:441400ffd086 92 }
geiineuville 0:441400ffd086 93 } while (err == ERR_MEM && len > 1);
geiineuville 0:441400ffd086 94
geiineuville 0:441400ffd086 95 if(err == ERR_OK) {
geiineuville 0:441400ffd086 96 data->offset += len;
geiineuville 0:441400ffd086 97 data->bleft -= len;
geiineuville 0:441400ffd086 98 }
geiineuville 0:441400ffd086 99 }
geiineuville 0:441400ffd086 100 return loadFromFile(con);
geiineuville 0:441400ffd086 101 }
geiineuville 0:441400ffd086 102
geiineuville 0:441400ffd086 103 /**
geiineuville 0:441400ffd086 104 * Returns the left size of a file.
geiineuville 0:441400ffd086 105 * @param fd The filehandler of which we want to know the filesize.
geiineuville 0:441400ffd086 106 * @return The filesize of fd.
geiineuville 0:441400ffd086 107 */
geiineuville 0:441400ffd086 108 long fleft(FILE *fd) const {
geiineuville 0:441400ffd086 109 long len, cur;
geiineuville 0:441400ffd086 110 cur = ftell(fd);
geiineuville 0:441400ffd086 111 fseek(fd, 0, SEEK_END);
geiineuville 0:441400ffd086 112 len = ftell(fd);
geiineuville 0:441400ffd086 113 fseek(fd, cur, SEEK_SET);
geiineuville 0:441400ffd086 114 return len;
geiineuville 0:441400ffd086 115 }
geiineuville 0:441400ffd086 116
geiineuville 0:441400ffd086 117 /**
geiineuville 0:441400ffd086 118 * Fill the buffer if the buffer is empty.
geiineuville 0:441400ffd086 119 * If the file is complete close the filehandler and return HTTP_SuccessEnded.
geiineuville 0:441400ffd086 120 */
geiineuville 0:441400ffd086 121 HTTPHandle loadFromFile(HTTPConnection *con) const {
geiineuville 0:441400ffd086 122 HTTPFileSystemData *data = static_cast<HTTPFileSystemData *>(con->data);
geiineuville 0:441400ffd086 123 if(!data->bleft) {
geiineuville 0:441400ffd086 124 if(data->fleft) {
geiineuville 0:441400ffd086 125 int len = fread(&data->buffer[0], sizeof(char), HTTP_BUFFER_SIZE, data->file);
geiineuville 0:441400ffd086 126 data->fleft -= len;
geiineuville 0:441400ffd086 127 data->bleft = len;
geiineuville 0:441400ffd086 128 data->offset = 0;
geiineuville 0:441400ffd086 129 } else {
geiineuville 0:441400ffd086 130 if(data->file) {
geiineuville 0:441400ffd086 131 fclose(data->file);
geiineuville 0:441400ffd086 132 data->file = 0;
geiineuville 0:441400ffd086 133 }
geiineuville 0:441400ffd086 134 return HTTP_SuccessEnded;
geiineuville 0:441400ffd086 135 }
geiineuville 0:441400ffd086 136 }
geiineuville 0:441400ffd086 137 return HTTP_Success;
geiineuville 0:441400ffd086 138 }
geiineuville 0:441400ffd086 139
geiineuville 0:441400ffd086 140 /** The Directory which will replace the prefix of the URL */
geiineuville 0:441400ffd086 141 const char *_dir;
geiineuville 0:441400ffd086 142 };
geiineuville 0:441400ffd086 143
geiineuville 0:441400ffd086 144 #endif