Diff: HTTPResponseFilter.cpp

Revision:

0:099f76422485

Child:

18:16192696c106

--- /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;
+}