mbed.org implementation of the abstract SmartREST library for the Cumulocity Platform SmartREST protocol.
Dependents: MbedSmartRestMain MbedSmartRestMain
Diff: HTTPResponseFilter.cpp
- Revision:
- 0:099f76422485
diff -r 000000000000 -r 099f76422485 HTTPResponseFilter.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HTTPResponseFilter.cpp Thu Jul 03 20:38:04 2014 +0200 @@ -0,0 +1,174 @@ +/* + * HTTPResponseFilter.cpp + * + * Created on: Feb 1, 2013 + * * Authors: Vincent Wochnik <v.wochnik@gmail.com> + * + * Copyright (c) 2013 Cumulocity GmbH + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#include "HTTPResponseFilter.h" +#include <stdlib.h> +#include <string.h> +#include <ctype.h> +#include <stdio.h> + +const char *cExpectedStatus = "HTTP/1.* "; +const char *cContentLength = "Content-Length: "; + +HTTPResponseFilter::HTTPResponseFilter(AbstractDataSource& source) : _source(source), _state(RESPF_STATE_INIT) +{ + _length = _read = 0; +} + +HTTPResponseFilter::~HTTPResponseFilter() +{ +} + +char HTTPResponseFilter::read() +{ + if (_state != RESPF_STATE_READ_HEADERS) + return 0; + if ((_length > 0) && (_length == _read)) + return 0; + _read++; + return _source.read(); +} + +uint8_t HTTPResponseFilter::status() +{ + if (_state != RESPF_STATE_READ_HEADERS) + return DS_STATUS_ERROR; + if ((_length > 0) && (_length == _read)) + return DS_STATUS_CLOSED; + return _source.status(); +} + +uint16_t HTTPResponseFilter::readStatus() +{ + uint16_t res = 0; + uint8_t state = 0; + char c; + size_t offset = 0; + uint8_t status = DS_STATUS_OK; + + if (_state != RESPF_STATE_INIT) + return 0; + + while ((state < 3) && (((c = _source.read()) > 0) || ((status = _source.status()) == DS_STATUS_OK))) { + switch (state) { + case 0: // read expected status line + if ((cExpectedStatus[offset] != c) && (cExpectedStatus[offset] != '*')) + state = 3; + offset++; + if (offset == strlen(cExpectedStatus)) { + state = 1; + } + break; + case 1: + if (isspace(c)) + state = 2; + if (isdigit(c)) + res = (res * 10) + (c - '0'); + break; + case 2: + if (c == '\n') + state = 3; + break; + } + } + + if ((status != DS_STATUS_OK) || (state != 3)) + return 0; + + _state = RESPF_STATE_READ_STATUS; + return res; +} + +bool HTTPResponseFilter::skipHeaders() +{ + uint16_t res = 0; + uint8_t state = 0; + char c; + size_t offset = 0; + uint8_t status = DS_STATUS_OK; + + if (_state != RESPF_STATE_READ_STATUS) + return false; + + while ((state < 5) && (((c = _source.read()) > 0) || ((status = _source.status()) == DS_STATUS_OK))) { + switch (state) { + case 0: // start of line + if (offset == 0) { + if (cContentLength[0] == c) + state = 1; + if (c == '\r') + state = 4; + } else { + if (c == '\r') + state = 3; + } + offset++; + break; + case 1: + if (c == '\r') + state = 3; + else if (cContentLength[offset] != c) + state = 0; + else if (offset == strlen(cContentLength)-1) + state = 2; + offset++; + break; + case 2: + if (isdigit(c)) + _length = (_length * 10) + (c - '0'); + else if (c == '\r') + state = 3; + else + state = 0; + offset++; + break; + case 3: + if (c == '\n') { + state = 0; + offset = 0; + } + break; + case 4: + if (c == '\n') + state = 5; + break; + } + } + + if ((status != DS_STATUS_OK) || (state != 5)) + return false; + + _state = RESPF_STATE_READ_HEADERS; + return true; +} + +void HTTPResponseFilter::reset() +{ + _state = RESPF_STATE_INIT; + _length = _read = 0; +}