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request.c
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request.c
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https://powcoder.com
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https://powcoder.com
代写代考加微信 powcoder
Assignment Project Exam Help
Add WeChat powcoder
https://powcoder.com
代写代考加微信 powcoder
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Add WeChat powcoder
#include "request.h"
#include "response.h"
#include <string.h>
/******************************************************************************
* ClientState-processing functions
*****************************************************************************/
ClientState *init_clients(int n) {
ClientState *clients = malloc(sizeof(ClientState) * n);
for (int i = 0; i < n; i++) {
clients[i].sock = -1; // -1 here indicates available entry
}
return clients;
}
/*
* Remove the client from the client array, free any memory allocated for
* fields of the ClientState struct, and close the socket.
*/
void remove_client(ClientState *cs) {
if (cs->reqData != NULL) {
free(cs->reqData->method);
free(cs->reqData->path);
for (int i = 0; i < MAX_QUERY_PARAMS && cs->reqData->params[i].name != NULL; i++) {
free(cs->reqData->params[i].name);
free(cs->reqData->params[i].value);
}
free(cs->reqData);
cs->reqData = NULL;
}
close(cs->sock);
cs->sock = -1;
cs->num_bytes = 0;
}
/*
* Search the first inbuf characters of buf for a network newline ("\r\n").
* Return the index *immediately after* the location of the '\n'
* if the network newline is found, or -1 otherwise.
* Definitely do not use strchr or any other string function in here. (Why not?)
*/
int find_network_newline(const char *buf, int inbuf) {
//IMPLEMENT THIS
return -1;
}
/*
* Removes one line (terminated by \r\n) from the client's buffer.
* Update client->num_bytes accordingly.
*
* For example, if `client->buf` contains the string "hello\r\ngoodbye\r\nblah",
* after calling remove_line on it, buf should contain "goodbye\r\nblah"
* Remember that the client buffer is *not* null-terminated automatically.
*/
void remove_buffered_line(ClientState *client) {
//IMPLEMENT THIS
}
/*
* Read some data into the client buffer. Append new data to data already
* in the buffer. Update client->num_bytes accordingly.
* Return the number of bytes read in, or -1 if the read failed.
* Be very careful with memory here: there might be existing data in the buffer
* that you don't want to overwrite, and you also don't want to go past
* the end of the buffer, and you should ensure the string is null-terminated.
*/
int read_from_client(ClientState *client) {
//IMPLEMENT THIS
// replace the return line with something more appropriate
return -1;
}
/*****************************************************************************
* Parsing the start line of an HTTP request.
****************************************************************************/
// Helper function declarations.
void parse_query(ReqData *req, const char *str);
void update_fdata(Fdata *f, const char *str);
void fdata_free(Fdata *f);
void log_request(const ReqData *req);
/* If there is a full line (terminated by a network newline (CRLF))
* then use this line to initialize client->reqData
* Return 0 if a full line has not been read, 1 otherwise.
*/
int parse_req_start_line(ClientState *client) {
//IMPLEMENT THIS
// This part is just for debugging purposes.
log_request(req);
return 1;
}
/*
* Initializes req->params from the key-value pairs contained in the given
* string.
* Assumes that the string is the part after the '?' in the HTTP request target,
* e.g., name1=value1&name2=value2.
*/
void parse_query(ReqData *req, const char *str) {
//IMPLEMENT THIS
}
/*
* Print information stored in the given request data to stderr.
*/
void log_request(const ReqData *req) {
fprintf(stderr, "Request parsed: [%s] [%s]\n", req->method, req->path);
for (int i = 0; i < MAX_QUERY_PARAMS && req->params[i].name != NULL; i++) {
fprintf(stderr, " %s -> %s\n",
req->params[i].name, req->params[i].value);
}
}
/******************************************************************************
* Parsing multipart form data (image-upload)
*****************************************************************************/
char *get_boundary(ClientState *client) {
int len_header = strlen(POST_BOUNDARY_HEADER);
while (1) {
int where = find_network_newline(client->buf, client->num_bytes);
if (where > 0) {
if (where < len_header || strncmp(POST_BOUNDARY_HEADER, client->buf, len_header) != 0) {
remove_buffered_line(client);
} else {
// We've found the boundary string!
// We are going to add "--" to the beginning to make it easier
// to match the boundary line later
char *boundary = malloc(where - len_header + 1);
strncpy(boundary, "--", where - len_header + 1);
strncat(boundary, client->buf + len_header, where - len_header - 1);
boundary[where - len_header] = '\0';
return boundary;
}
} else {
// Need to read more bytes
if (read_from_client(client) <= 0) {
// Couldn't read; this is a bad request, so give up.
return NULL;
}
}
}
return NULL;
}
char *get_bitmap_filename(ClientState *client, const char *boundary) {
int len_boundary = strlen(boundary);
// Read until finding the boundary string.
while (1) {
int where = find_network_newline(client->buf, client->num_bytes);
if (where > 0) {
if (where < len_boundary + 2 ||
strncmp(boundary, client->buf, len_boundary) != 0) {
remove_buffered_line(client);
} else {
// We've found the line with the boundary!
remove_buffered_line(client);
break;
}
} else {
// Need to read more bytes
if (read_from_client(client) <= 0) {
// Couldn't read; this is a bad request, so give up.
return NULL;
}
}
}
int where = find_network_newline(client->buf, client->num_bytes);
client->buf[where-1] = '\0'; // Used for strrchr to work on just the single line.
char *raw_filename = strrchr(client->buf, '=') + 2;
int len_filename = client->buf + where - 3 - raw_filename;
char *filename = malloc(len_filename + 1);
strncpy(filename, raw_filename, len_filename);
filename[len_filename] = '\0';
// Restore client->buf
client->buf[where - 1] = '\n';
remove_buffered_line(client);
return filename;
}
/*
* Read the file data from the socket and write it to the file descriptor
* file_fd.
* You know when you have reached the end of the file in one of two ways:
* - search for the boundary string in each chunk of data read
* (Remember the "\r\n" that comes before the boundary string, and the
* "--\r\n" that comes after.)
* - extract the file size from the bitmap data, and use that to determine
* how many bytes to read from the socket and write to the file
*/
int save_file_upload(ClientState *client, const char *boundary, int file_fd) {
// Read in the next two lines: Content-Type line, and empty line
remove_buffered_line(client);
remove_buffered_line(client);
// IMPLEMENT THIS
return 0;
}