statcodes.c

电驴下载工具eMule0.47aVeryCD的源代码,可作分析测试也可用于P2P软件的开发研究.

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/************************************************************************
* Purpose: This file defines status codes, buffers to store the status	*
* messages and functions to manipulate those buffers					*
************************************************************************/

#include <stdio.h>
#include <string.h>
#include "util.h"
#include "statcodes.h"

#define NUM_1XX_CODES   2
static const char *Http1xxCodes[NUM_1XX_CODES];
static const char *Http1xxStr = "Continue\0" "Switching Protocols\0";

#define NUM_2XX_CODES   7
static const char *Http2xxCodes[NUM_2XX_CODES];
static const char *Http2xxStr =
    "OK\0"
    "Created\0"
    "Accepted\0"
    "Non-Authoratative Information\0"
    "No Content\0" "Reset Content\0" "Partial Content\0";

#define NUM_3XX_CODES   8
static const char *Http3xxCodes[NUM_3XX_CODES];
static const char *Http3xxStr =
    "Multiple Choices\0"
    "Moved Permanently\0"
    "Found\0"
    "See Other\0"
    "Not Modified\0" "Use Proxy\0" "\0" "Temporary Redirect\0";

#define NUM_4XX_CODES   18
static const char *Http4xxCodes[NUM_4XX_CODES];
static const char *Http4xxStr =
    "Bad Request\0"
    "Unauthorized\0"
    "Payment Required\0"
    "Forbidden\0"
    "Not Found\0"
    "Method Not Allowed\0"
    "Not Acceptable\0"
    "Proxy Authentication Required\0"
    "Request Timeout\0"
    "Conflict\0"
    "Gone\0"
    "Length Required\0"
    "Precondition Failed\0"
    "Request Entity Too Large\0"
    "Request-URI Too Long\0"
    "Unsupported Media Type\0"
    "Requested Range Not Satisfiable\0" "Expectation Failed\0";

#define NUM_5XX_CODES   6
static const char *Http5xxCodes[NUM_5XX_CODES];
static const char *Http5xxStr =
    "Internal Server Error\0"
    "Not Implemented\0"
    "Bad Gateway\0"
    "Service Unavailable\0"
    "Gateway Timeout\0" "HTTP Version Not Supported\0";

static xboolean gInitialized = FALSE;

/************************************************************************
************************* Functions *************************************
************************************************************************/

/************************************************************************
* Function: init_table													
*																		
* Parameters:															
*	IN const char* encoded_str ; status code encoded string 			
*	OUT const char *table[] ; table to store the encoded status code 
*							  strings 
*	IN int tbl_size ;	size of the table														
*																		
* Description: Initializing table representing an array of string		
*	pointers with the individual strings that are comprised in the		
*	input const char* encoded_str parameter.							
*																		
* Returns:																
*	 void																
************************************************************************/
static XINLINE void
init_table( IN const char *encoded_str,
            OUT const char *table[],
            IN int tbl_size )
{
    int i;
    const char *s = encoded_str;

    for( i = 0; i < tbl_size; i++ ) {
        table[i] = s;
        s += strlen( s ) + 1;   // next entry
    }
}

/************************************************************************
* Function: init_tables													
*																		
* Parameters:															
*	none																
*																		
* Description: Initializing tables with HTTP strings and different HTTP 
* codes.																
*																		
* Returns:																
*	 void																
************************************************************************/
static XINLINE void
init_tables( void )
{
    init_table( Http1xxStr, Http1xxCodes, NUM_1XX_CODES );
    init_table( Http2xxStr, Http2xxCodes, NUM_2XX_CODES );
    init_table( Http3xxStr, Http3xxCodes, NUM_3XX_CODES );
    init_table( Http4xxStr, Http4xxCodes, NUM_4XX_CODES );
    init_table( Http5xxStr, Http5xxCodes, NUM_5XX_CODES );

    gInitialized = TRUE;        // mark only after complete
}

/************************************************************************
* Function: http_get_code_text											
*																		
* Parameters:															
*	int statusCode ; Status code based on which the status table and 
*					status message is returned 							
*																		
* Description: Return the right status message based on the passed in	
*	int statusCode input parameter										
*																		
* Returns:																
*	 const char* ptr - pointer to the status message string				
************************************************************************/
const char *
http_get_code_text( int statusCode )
{
    int index;
    int table_num;

    if( !gInitialized ) {
        init_tables(  );
    }

    if( statusCode < 100 && statusCode >= 600 ) {
        return NULL;
    }

    index = statusCode % 100;
    table_num = statusCode / 100;

    if( table_num == 1 && index < NUM_1XX_CODES ) {
        return Http1xxCodes[index];
    }

    if( table_num == 2 && index < NUM_2XX_CODES ) {
        return Http2xxCodes[index];
    }

    if( table_num == 3 && index < NUM_3XX_CODES ) {
        return Http3xxCodes[index];
    }

    if( table_num == 4 && index < NUM_4XX_CODES ) {
        return Http4xxCodes[index];
    }

    if( table_num == 5 && index < NUM_5XX_CODES ) {
        return Http5xxCodes[index];
    }

    return NULL;
}