Diff: tcp/http.cpp

Revision:

10:f0854784e960

Parent:

4:31fa7d50722c

Child:

21:02c82594c8c0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tcp/http.cpp	Sun Apr 16 14:21:55 2017 +0000
@@ -0,0 +1,136 @@
+#include    "mbed.h"
+#include    "http.h"
+#include    "time.h"
+
+
+int (*HttpRequestFunction)(char *pPath, char *pLastModified);              //Plumb into this from your html server
+int (*HttpResponseFunction)(int position, int mss, char *pData, int todo); //Plumb into this from your html server
+
+static void dateHeaderFromTm(struct tm* ptm, char* ptext)
+{
+    size_t size = strftime(ptext, HTTP_DATE_LENGTH, "%a, %d %b %Y %H:%M:%S GMT", ptm);//Sun, 06 Nov 1994 08:49:37 GMT  ; RFC 822, updated by RFC 1123
+}
+void HttpDateHeaderFromNow(char* pText)
+{
+    struct tm tm;
+    TimeToTmUtc(time(NULL), &tm);
+    dateHeaderFromTm(&tm, pText);
+}
+void HttpDateHeaderFromDateTime(const char* date, const char *ptime, char* ptext)
+{
+    struct tm tm;
+    TimeAsciiDateTimeToTm(date, ptime, &tm);
+    dateHeaderFromTm(&tm, ptext);
+}
+
+static char* getNextLine(char* p, char* pE) //Terminates this line and returns the start of the next line or NULL if none
+{
+    while (true)
+    {
+        if (p == pE)             //There are no more lines
+        {
+            *p = 0;              //terminate the line
+            return NULL;   
+        }
+        if (*p == 0) return NULL;//There are no more lines
+        if (*p == '\n')
+        {
+            *p = 0;              //make the line a c string
+            return p + 1;        //return the start of the next line
+        }
+        if (*p < ' ')    *p = 0; //terminate the line at any invalid characters
+        if (*p >= 0x7f)  *p = 0; //terminate the line at any invalid characters
+        p++;
+    }
+}
+
+static void splitRequest(char* p, char** ppMethod, char** ppPath, char** ppQuery)
+{        
+    *ppMethod   = NULL;
+    *ppPath     = NULL;
+    *ppQuery    = NULL;
+
+    while (*p == ' ')         //Move past any leading spaces
+    {
+        if (*p == 0) return;
+        p++;
+    }
+    *ppMethod = p;            //Record the start of the method (GET or POST)
+ 
+    while (*p != ' ')         //Move past the method
+    {
+        if (*p == 0) return;
+        p++;
+    } 
+    *p = 0;                   //Terminate the method
+    p++;                      //Start at next character
+
+    while (*p == ' ')         //Move past any spaces
+    {
+        if (*p == 0) return;
+        p++;
+    } 
+    *ppPath = p;              //Record the start of the path
+    
+    while (*p != ' ')         //Move past the path and query
+    {
+        if (*p == 0) return;
+        if (*p == '?')
+        {
+            *p = 0;           //Terminate the path
+            *ppQuery = p + 1; //Record the start of the query
+        }
+        p++;
+    }
+    *p = 0;                   //Terminate the path or query
+}
+static void splitHeader(char* p, char** ppName, char** ppValue)
+{
+    *ppName    = p;                     //Record the start of the name
+    *ppValue   = NULL;
+
+    while (*p != ':')                   //Loop to an ':'
+    {
+        if (!*p) return;
+        p++;
+    }
+    *p = 0;                             //Terminate the name by replacing the ':' with a NUL char
+    p++;
+    while (*p == ' ')                   //Move past any spaces
+    {
+        if (*p == 0) return;
+        p++;
+    }
+    *ppValue = p;                       //Record the start of the value
+}
+
+int HttpRequest(int position, int len, char *pData)
+{   
+    char* pMethod;
+    char* pPath;
+    char* pQuery;
+
+    char* pEnd = pData + len;
+    char* pThis = pData;    
+    char* pNext = getNextLine(pThis, pEnd);
+    splitRequest(pThis, &pMethod, &pPath, &pQuery);
+
+    char* pLastModified;
+    while(pNext)
+    {
+        pThis = pNext;
+        pNext = getNextLine(pThis, pEnd);
+        if (*pThis == 0) break;     //This line is empty ie no more headers
+        char* pName;
+        char* pValue;
+        splitHeader(pThis, &pName, &pValue);
+        if (strcmp(pName, "If-Modified-Since") == 0) pLastModified = pValue;
+    }
+    
+    return HttpRequestFunction(pPath, pLastModified);
+}
+int HttpResponse(int position, int mss, char *pData, int todo)
+{
+    return HttpResponseFunction(position, mss, pData, todo);
+}
+