/
download-agent-encoding.c
executable file
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/
download-agent-encoding.c
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/*
* Copyright (c) 2012 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <string.h>
#include <stdlib.h>
#include <glib.h>
#include "download-agent-encoding.h"
#include "download-agent-debug.h"
da_result_t _parsing_base64_encoded_str(const char *in_encoded_str,
char **out_charset_type,
char *out_encoding_type,
char **out_raw_encoded_str);
da_bool_t is_base64_encoded_word(const char *in_str)
{
const char *haystack = DA_NULL;
char first_needle[8] = {0,};
char second_needle[8] = {0,};
char *found_str = DA_NULL;
if (!in_str) {
DA_LOG_ERR(Default, "input string is NULL");
return DA_FALSE;
}
haystack = in_str;
if (haystack[0] == '"') {
snprintf(first_needle, sizeof(first_needle), "%s", "\"=?"); // "=?
snprintf(second_needle, sizeof(second_needle), "%s", "?=\""); // ?="
} else {
snprintf(first_needle, sizeof(first_needle), "%s", "=?"); // =?
snprintf(second_needle, sizeof(second_needle), "%s", "?="); // ?=
}
// DA_LOG(Default, "needle = [%s], haystack = [%s]", first_needle, haystack);
found_str = strstr(haystack, first_needle);
if (found_str) {
if (found_str == haystack) {
// DA_LOG(Default, "Input string is starting with %s", needle);
haystack = haystack + strlen(haystack) - strlen(second_needle);
// DA_LOG(Default, "second haystack is [%s]", haystack);
if(!strcmp(haystack, second_needle))
return DA_TRUE;
}
}
return DA_FALSE;
}
da_result_t decode_base64_encoded_str(const char *in_encoded_str,
char **out_decoded_ascii_str)
{
da_result_t ret = DA_RESULT_OK;
const char *org_str = DA_NULL;
char *charset_type = NULL;
char encoding_type = '\0';
char *raw_encoded_str = NULL;
char *decoded_str = NULL;
const gchar *g_encoded_text = NULL;
guchar *g_decoded_text = NULL;
gsize g_decoded_text_len = 0;
DA_LOG(Default, "input str = [%s]", in_encoded_str);
org_str = in_encoded_str;
if(!org_str) {
DA_LOG_ERR(Default, "Input string is NULL");
ret = DA_ERR_INVALID_ARGUMENT;
goto ERR;
}
ret = _parsing_base64_encoded_str(org_str, &charset_type,
&encoding_type, &raw_encoded_str);
if(ret != DA_RESULT_OK) {
goto ERR;
}
// DA_LOG(Default, "charset = [%s], encoding = [%c], raw = [%s]", charset_type, encoding_type, raw_encoded_str);
if(encoding_type != 'B') {
DA_LOG_ERR(Default, "Encoded Word is not encoded with Base64, but %c. We can only handle Base64.", encoding_type);
ret = DA_ERR_INVALID_ARGUMENT;
goto ERR;
}
/*
* on glib/gtype.h
* typedef char gchar;
* typedef unsigned char guchar;
*
*/
g_encoded_text = (const gchar*)raw_encoded_str;
g_decoded_text = g_base64_decode(g_encoded_text, &g_decoded_text_len);
if(g_decoded_text) {
DA_LOG(Default, "g_decoded_text = [%s]", g_decoded_text);
decoded_str = (char*)calloc(1, g_decoded_text_len+1);
if(!decoded_str) {
DA_LOG_ERR(Default, "DA_ERR_FAIL_TO_MEMALLOC");
ret = DA_ERR_FAIL_TO_MEMALLOC;
goto ERR;
} else {
memcpy(decoded_str, g_decoded_text, g_decoded_text_len);
}
}
DA_LOG(Default, "decoded_str = [%s]", decoded_str);
ERR:
*out_decoded_ascii_str = decoded_str;
if(charset_type) {
free(charset_type);
charset_type = NULL;
}
if(raw_encoded_str) {
free(raw_encoded_str);
raw_encoded_str = NULL;
}
if(g_decoded_text) {
g_free(g_decoded_text);
}
return ret;
}
da_result_t _parsing_base64_encoded_str(const char *in_encoded_str,
char **out_charset_type,
char *out_encoding_type,
char **out_raw_encoded_str)
{
da_result_t ret = DA_RESULT_OK;
const char *org_str = DA_NULL; // e.g. =?UTF-8?B?7Jew7JWE7JmA7IKs7J6QLmpwZw==?=
char *charset_type = NULL; // e.g. UTF-8
char encoding_type = '\0'; // e.g. B (means Base64)
char *raw_encoded_str = NULL; // e.g. 7Jew7JWE7JmA7IKs7J6QLmpwZw==
char *haystack = DA_NULL;
char needle[8] = {0,};
char *wanted_str = DA_NULL;
int wanted_str_len = 0;
char *wanted_str_start = DA_NULL;
char *wanted_str_end = DA_NULL;
org_str = in_encoded_str;
if (!org_str) {
DA_LOG_ERR(Default, "Input string is NULL");
ret = DA_ERR_INVALID_ARGUMENT;
goto ERR;
}
// strip "=?"
haystack = (char*)org_str;
snprintf(needle, sizeof(needle), "=?");
wanted_str_end = strstr(haystack, needle);
if (!wanted_str_end) {
DA_LOG_ERR(Default, "DA_ERR_INVALID_ARGUMENT");
ret = DA_ERR_INVALID_ARGUMENT;
goto ERR;
} else {
wanted_str = wanted_str_end + strlen(needle);
DA_LOG(Default, "strip [%s]", wanted_str);
}
// for charset
haystack = wanted_str_start = wanted_str;
needle[0] = '?';
wanted_str_end = strchr(haystack, needle[0]);
if (!wanted_str_end) {
DA_LOG_ERR(Default, "DA_ERR_INVALID_ARGUMENT");
ret = DA_ERR_INVALID_ARGUMENT;
goto ERR;
} else {
wanted_str_len = wanted_str_end - wanted_str_start + 1;
wanted_str = (char*)calloc(1, wanted_str_len+1);
if (!wanted_str) {
DA_LOG_ERR(Default, "DA_ERR_FAIL_TO_MEMALLOC");
ret = DA_ERR_FAIL_TO_MEMALLOC;
goto ERR;
} else {
snprintf(wanted_str, wanted_str_len+1, "%s", wanted_str_start);
charset_type = wanted_str;
wanted_str = DA_NULL;
}
DA_LOG(Default, "charset [%s]", charset_type);
}
// for encoding
encoding_type = *(++wanted_str_end);
DA_LOG(Default, "encoding [%c]", encoding_type);
// for raw encoded str
haystack = wanted_str_start = wanted_str_end + 1;
snprintf(needle, sizeof(needle), "?=");
wanted_str_end = strstr(haystack, needle);
if (!wanted_str_end) {
DA_LOG_ERR(Default, "DA_ERR_INVALID_ARGUMENT");
ret = DA_ERR_INVALID_ARGUMENT;
goto ERR;
} else {
wanted_str_len = wanted_str_end - wanted_str_start + 1;
wanted_str = (char*)calloc(1, wanted_str_len+1);
if (!wanted_str) {
DA_LOG_ERR(Default, "DA_ERR_FAIL_TO_MEMALLOC");
ret = DA_ERR_FAIL_TO_MEMALLOC;
goto ERR;
} else {
snprintf(wanted_str, wanted_str_len+1, "%s", wanted_str_start);
raw_encoded_str = wanted_str;
wanted_str = NULL;
}
DA_LOG(Default, "raw encoded str [%s]", raw_encoded_str);
}
ERR:
if (ret != DA_RESULT_OK) {
if (charset_type) {
free(charset_type);
charset_type = NULL;
}
}
*out_charset_type = charset_type;
*out_encoding_type = encoding_type;
*out_raw_encoded_str = raw_encoded_str;
return ret;
}
void decode_url_encoded_str(const char *in_encoded_str, char **out_str)
{
char *in = NULL;
char *out = NULL;
*out_str = calloc(1, strlen(in_encoded_str) + 1);
if (*out_str == NULL)
return;
out = *out_str;
in = (char *)in_encoded_str;
while (*in)
{
if (*in == '%') {
int hex = 0;
in++;
if (sscanf(in, "%2x", &hex) <= 0) {
return;
} else {
*out = hex;
in++;
}
} else if (*in == '+') {
*out = ' ';
} else {
*out = *in;
}
in++;
out++;
}
}