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tcp/http/httprequest.c@110:67c96c143c2a, 2019-01-18 (annotated)

Committer:
andrewboyson
Date:
Fri Jan 18 17:41:06 2019 +0000
Revision:
110:67c96c143c2a
Parent:
61:aad055f1b0d1
Child:
117:a725e5ad4fad
Tidies up the http query module

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 61:aad055f1b0d1 1 #include <stdbool.h>
andrewboyson 61:aad055f1b0d1 2 #include <stdio.h>
andrewboyson 61:aad055f1b0d1 3 #include <string.h>
andrewboyson 54:84ef2b29cf7e 4
andrewboyson 110:67c96c143c2a 5 #include "http.h"
andrewboyson 110:67c96c143c2a 6
andrewboyson 110:67c96c143c2a 7 static char* terminateThisAndGetNextLine(char* p, char* pE) //Terminates this line and returns the start of the next line or NULL if none
andrewboyson 54:84ef2b29cf7e 8 {
andrewboyson 54:84ef2b29cf7e 9 while (true)
andrewboyson 54:84ef2b29cf7e 10 {
andrewboyson 110:67c96c143c2a 11 if ( p == pE) { *p = 0; return NULL; } //No more buffer - relies on having designed the buffer to be bigger than an ethernet packet
andrewboyson 110:67c96c143c2a 12 if (*p == 0) return NULL; //There are no more lines
andrewboyson 110:67c96c143c2a 13 if (*p == '\n') { *p = 0; return p + 1; } //return the start of the next line
andrewboyson 110:67c96c143c2a 14 if (*p < ' ') { *p = 0; return NULL; } //Invalid characters
andrewboyson 110:67c96c143c2a 15 if (*p >= 0x7f) { *p = 0; return NULL; } //Invalid characters
andrewboyson 54:84ef2b29cf7e 16 p++;
andrewboyson 54:84ef2b29cf7e 17 }
andrewboyson 54:84ef2b29cf7e 18 }
andrewboyson 54:84ef2b29cf7e 19
andrewboyson 110:67c96c143c2a 20 static void splitRequest(char* p, char** ppMethod, char** ppPath, char** ppQuery)
andrewboyson 54:84ef2b29cf7e 21 {
andrewboyson 54:84ef2b29cf7e 22 *ppMethod = NULL;
andrewboyson 54:84ef2b29cf7e 23 *ppPath = NULL;
andrewboyson 54:84ef2b29cf7e 24 *ppQuery = NULL;
andrewboyson 54:84ef2b29cf7e 25
andrewboyson 54:84ef2b29cf7e 26 while (*p == ' ') //Move past any leading spaces
andrewboyson 54:84ef2b29cf7e 27 {
andrewboyson 54:84ef2b29cf7e 28 if (*p == 0) return;
andrewboyson 54:84ef2b29cf7e 29 p++;
andrewboyson 54:84ef2b29cf7e 30 }
andrewboyson 54:84ef2b29cf7e 31 *ppMethod = p; //Record the start of the method (GET or POST)
andrewboyson 54:84ef2b29cf7e 32
andrewboyson 54:84ef2b29cf7e 33 while (*p != ' ') //Move past the method
andrewboyson 54:84ef2b29cf7e 34 {
andrewboyson 54:84ef2b29cf7e 35 if (*p == 0) return;
andrewboyson 54:84ef2b29cf7e 36 p++;
andrewboyson 54:84ef2b29cf7e 37 }
andrewboyson 54:84ef2b29cf7e 38 *p = 0; //Terminate the method
andrewboyson 54:84ef2b29cf7e 39 p++; //Start at next character
andrewboyson 54:84ef2b29cf7e 40
andrewboyson 54:84ef2b29cf7e 41 while (*p == ' ') //Move past any spaces
andrewboyson 54:84ef2b29cf7e 42 {
andrewboyson 54:84ef2b29cf7e 43 if (*p == 0) return;
andrewboyson 54:84ef2b29cf7e 44 p++;
andrewboyson 54:84ef2b29cf7e 45 }
andrewboyson 54:84ef2b29cf7e 46 *ppPath = p; //Record the start of the path
andrewboyson 54:84ef2b29cf7e 47
andrewboyson 54:84ef2b29cf7e 48 while (*p != ' ') //Move past the path and query
andrewboyson 54:84ef2b29cf7e 49 {
andrewboyson 54:84ef2b29cf7e 50 if (*p == 0) return;
andrewboyson 54:84ef2b29cf7e 51 if (*p == '?')
andrewboyson 54:84ef2b29cf7e 52 {
andrewboyson 54:84ef2b29cf7e 53 *p = 0; //Terminate the path
andrewboyson 54:84ef2b29cf7e 54 *ppQuery = p + 1; //Record the start of the query
andrewboyson 54:84ef2b29cf7e 55 }
andrewboyson 54:84ef2b29cf7e 56 p++;
andrewboyson 54:84ef2b29cf7e 57 }
andrewboyson 54:84ef2b29cf7e 58 *p = 0; //Terminate the path or query
andrewboyson 54:84ef2b29cf7e 59 }
andrewboyson 110:67c96c143c2a 60 static void splitHeader(char* p, char** ppName, char** ppValue)
andrewboyson 54:84ef2b29cf7e 61 {
andrewboyson 54:84ef2b29cf7e 62 *ppName = p; //Record the start of the name
andrewboyson 54:84ef2b29cf7e 63 *ppValue = NULL;
andrewboyson 54:84ef2b29cf7e 64
andrewboyson 54:84ef2b29cf7e 65 while (*p != ':') //Loop to an ':'
andrewboyson 54:84ef2b29cf7e 66 {
andrewboyson 54:84ef2b29cf7e 67 if (!*p) return;
andrewboyson 54:84ef2b29cf7e 68 p++;
andrewboyson 54:84ef2b29cf7e 69 }
andrewboyson 54:84ef2b29cf7e 70 *p = 0; //Terminate the name by replacing the ':' with a NUL char
andrewboyson 54:84ef2b29cf7e 71 p++;
andrewboyson 54:84ef2b29cf7e 72 while (*p == ' ') //Move past any spaces
andrewboyson 54:84ef2b29cf7e 73 {
andrewboyson 54:84ef2b29cf7e 74 if (*p == 0) return;
andrewboyson 54:84ef2b29cf7e 75 p++;
andrewboyson 54:84ef2b29cf7e 76 }
andrewboyson 54:84ef2b29cf7e 77 *ppValue = p; //Record the start of the value
andrewboyson 54:84ef2b29cf7e 78 }
andrewboyson 54:84ef2b29cf7e 79 void HttpReadRequest(char *pData, int len, char** ppMethod, char** ppPath, char** ppQuery, char** ppLastModified)
andrewboyson 54:84ef2b29cf7e 80 {
andrewboyson 54:84ef2b29cf7e 81 char* pEnd = pData + len;
andrewboyson 110:67c96c143c2a 82 char* pThis = pData;
andrewboyson 110:67c96c143c2a 83 char* pNext = terminateThisAndGetNextLine(pThis, pEnd);
andrewboyson 110:67c96c143c2a 84 splitRequest(pThis, ppMethod, ppPath, ppQuery);
andrewboyson 54:84ef2b29cf7e 85
andrewboyson 54:84ef2b29cf7e 86 while(pNext)
andrewboyson 54:84ef2b29cf7e 87 {
andrewboyson 54:84ef2b29cf7e 88 pThis = pNext;
andrewboyson 110:67c96c143c2a 89 pNext = terminateThisAndGetNextLine(pThis, pEnd);
andrewboyson 54:84ef2b29cf7e 90 if (*pThis == 0) break; //This line is empty ie no more headers
andrewboyson 54:84ef2b29cf7e 91 char* pName;
andrewboyson 54:84ef2b29cf7e 92 char* pValue;
andrewboyson 110:67c96c143c2a 93 splitHeader(pThis, &pName, &pValue);
andrewboyson 54:84ef2b29cf7e 94 if (strcmp(pName, "If-Modified-Since") == 0) *ppLastModified = pValue;
andrewboyson 54:84ef2b29cf7e 95 }
andrewboyson 54:84ef2b29cf7e 96 }