| 1 | #include <stdlib.h> |
| 2 | #include <stdio.h> |
| 3 | #include <string.h> |
| 4 | #include <assert.h> |
| 5 | |
| 6 | #include "http_response.h" |
| 7 | |
| 8 | struct http_response_s { |
| 9 | int complete; |
| 10 | |
| 11 | char *data; |
| 12 | int data_size; |
| 13 | int data_length; |
| 14 | }; |
| 15 | |
| 16 | |
| 17 | static void |
| 18 | http_response_add_data(http_response_t *response, const char *data, int datalen) |
| 19 | { |
| 20 | int newdatasize; |
| 21 | |
| 22 | assert(response); |
| 23 | assert(data); |
| 24 | assert(datalen > 0); |
| 25 | |
| 26 | newdatasize = response->data_size; |
| 27 | while (response->data_size+datalen > newdatasize) { |
| 28 | newdatasize *= 2; |
| 29 | } |
| 30 | if (newdatasize != response->data_size) { |
| 31 | response->data = realloc(response->data, newdatasize); |
| 32 | assert(response->data); |
| 33 | } |
| 34 | memcpy(response->data+response->data_length, data, datalen); |
| 35 | response->data_length += datalen; |
| 36 | } |
| 37 | |
| 38 | http_response_t * |
| 39 | http_response_init(const char *protocol, int code, const char *message) |
| 40 | { |
| 41 | http_response_t *response; |
| 42 | char codestr[4]; |
| 43 | |
| 44 | assert(code >= 100 && code < 1000); |
| 45 | |
| 46 | /* Convert code into string */ |
| 47 | memset(codestr, 0, sizeof(codestr)); |
| 48 | snprintf(codestr, sizeof(codestr), "%u", code); |
| 49 | |
| 50 | response = calloc(1, sizeof(http_response_t)); |
| 51 | if (!response) { |
| 52 | return NULL; |
| 53 | } |
| 54 | |
| 55 | /* Allocate response data */ |
| 56 | response->data_size = 1024; |
| 57 | response->data = malloc(response->data_size); |
| 58 | if (!response->data) { |
| 59 | free(response); |
| 60 | return NULL; |
| 61 | } |
| 62 | |
| 63 | /* Add first line of response to the data array */ |
| 64 | http_response_add_data(response, protocol, strlen(protocol)); |
| 65 | http_response_add_data(response, " ", 1); |
| 66 | http_response_add_data(response, codestr, strlen(codestr)); |
| 67 | http_response_add_data(response, " ", 1); |
| 68 | http_response_add_data(response, message, strlen(message)); |
| 69 | http_response_add_data(response, "\r\n", 2); |
| 70 | |
| 71 | return response; |
| 72 | } |
| 73 | |
| 74 | void |
| 75 | http_response_destroy(http_response_t *response) |
| 76 | { |
| 77 | if (response) { |
| 78 | free(response->data); |
| 79 | free(response); |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | void |
| 84 | http_response_add_header(http_response_t *response, const char *name, const char *value) |
| 85 | { |
| 86 | assert(response); |
| 87 | assert(name); |
| 88 | assert(value); |
| 89 | |
| 90 | http_response_add_data(response, name, strlen(name)); |
| 91 | http_response_add_data(response, ": ", 2); |
| 92 | http_response_add_data(response, value, strlen(value)); |
| 93 | http_response_add_data(response, "\r\n", 2); |
| 94 | } |
| 95 | |
| 96 | void |
| 97 | http_response_finish(http_response_t *response, const char *data, int datalen) |
| 98 | { |
| 99 | assert(response); |
| 100 | assert(datalen==0 || (data && datalen > 0)); |
| 101 | |
| 102 | if (data && datalen > 0) { |
| 103 | const char *hdrname = "Content-Length"; |
| 104 | char hdrvalue[16]; |
| 105 | |
| 106 | memset(hdrvalue, 0, sizeof(hdrvalue)); |
| 107 | snprintf(hdrvalue, sizeof(hdrvalue)-1, "%d", datalen); |
| 108 | |
| 109 | /* Add Content-Length header first */ |
| 110 | http_response_add_data(response, hdrname, strlen(hdrname)); |
| 111 | http_response_add_data(response, ": ", 2); |
| 112 | http_response_add_data(response, hdrvalue, strlen(hdrvalue)); |
| 113 | http_response_add_data(response, "\r\n\r\n", 4); |
| 114 | |
| 115 | /* Add data to the end of response */ |
| 116 | http_response_add_data(response, data, datalen); |
| 117 | } else { |
| 118 | /* Add extra end of line after headers */ |
| 119 | http_response_add_data(response, "\r\n", 2); |
| 120 | } |
| 121 | response->complete = 1; |
| 122 | } |
| 123 | |
| 124 | const char * |
| 125 | http_response_get_data(http_response_t *response, int *datalen) |
| 126 | { |
| 127 | assert(response); |
| 128 | assert(datalen); |
| 129 | assert(response->complete); |
| 130 | |
| 131 | *datalen = response->data_length; |
| 132 | return response->data; |
| 133 | } |