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Utils: is_base64url. 

GitOrigin-RevId: b58daeb9fa82d37e9c653d72ef702bcb15a5392b
This commit is contained in:
levlam 2018-01-19 16:38:56 +03:00
parent c816837736
commit 22ad86508a
3 changed files with 56 additions and 23 deletions
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44
tdutils/td/utils/base64.cpp
View File

@ -188,11 +188,8 @@ Result<string> base64url_decode(Slice base64) {
return output;
}
bool is_base64(Slice input) {
if ((input.size() & 3) != 0) {
return false;
}
template <bool is_url>
static bool is_base64_impl(Slice input) {
size_t padding_length = 0;
while (!input.empty() && input.back() == '=') {
input.remove_suffix(1);
@ -201,22 +198,35 @@ bool is_base64(Slice input) {
if (padding_length >= 3) {
return false;
}
if ((!is_url || padding_length > 0) && ((input.size() + padding_length) & 3) != 0) {
return false;
}
if (is_url && (input.size() & 3) == 1) {
return false;
}
init_base64_table();
for (size_t i = 0; i < input.size(); i++) {
if (char_to_value[input.ubegin()[i]] == 64) {
unsigned char *table;
if (is_url) {
init_base64url_table();
table = url_char_to_value;
} else {
init_base64_table();
table = char_to_value;
}
for (auto c:input) {
if (table[static_cast<unsigned char>(c)] == 64) {
return false;
}
}
if ((input.size() & 3) == 2) {
auto value = char_to_value[input.back()];
auto value = table[input.back()];
if ((value & 15) != 0) {
return false;
}
}
if ((input.size() & 3) == 3) {
auto value = char_to_value[input.back()];
auto value = table[input.back()];
if ((value & 3) != 0) {
return false;
}
@ -225,13 +235,21 @@ bool is_base64(Slice input) {
return true;
}
bool is_base64(Slice input) {
return is_base64_impl<false>(input);
}
bool is_base64url(Slice input) {
return is_base64_impl<true>(input);
}
string base64_filter(Slice input) {
string res;
res.reserve(input.size());
init_base64_table();
for (size_t i = 0; i < input.size(); i++) {
if (char_to_value[input.ubegin()[i]] != 64 || input[i] == '=') {
res += input[i];
for (auto c : input) {
if (char_to_value[static_cast<unsigned char>(c)] != 64 || c == '=') {
res += c;
}
}
return res;

1
tdutils/td/utils/base64.h
View File

@ -19,6 +19,7 @@ string base64url_encode(Slice input);
Result<string> base64url_decode(Slice base64);
bool is_base64(Slice input);
bool is_base64url(Slice input);
string base64_filter(Slice input);

34
tdutils/test/misc.cpp
View File

@ -115,6 +115,30 @@ TEST(Misc, errno_tls_bug) {
}
TEST(Misc, base64) {
ASSERT_TRUE(is_base64("dGVzdA==") == true);
ASSERT_TRUE(is_base64("dGVzdB==") == false);
ASSERT_TRUE(is_base64("dGVzdA=") == false);
ASSERT_TRUE(is_base64("dGVzdA") == false);
ASSERT_TRUE(is_base64("dGVz") == true);
ASSERT_TRUE(is_base64("") == true);
ASSERT_TRUE(is_base64("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/") == true);
ASSERT_TRUE(is_base64("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=") == false);
ASSERT_TRUE(is_base64("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-/") == false);
ASSERT_TRUE(is_base64("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_") == false);
ASSERT_TRUE(is_base64("====") == false);
ASSERT_TRUE(is_base64url("dGVzdA==") == true);
ASSERT_TRUE(is_base64url("dGVzdB==") == false);
ASSERT_TRUE(is_base64url("dGVzdA=") == false);
ASSERT_TRUE(is_base64url("dGVzdA") == true);
ASSERT_TRUE(is_base64url("dGVz") == true);
ASSERT_TRUE(is_base64url("") == true);
ASSERT_TRUE(is_base64url("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_") == true);
ASSERT_TRUE(is_base64url("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_=") == false);
ASSERT_TRUE(is_base64url("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-/") == false);
ASSERT_TRUE(is_base64url("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/") == false);
ASSERT_TRUE(is_base64url("====") == false);
for (int l = 0; l < 300000; l += l / 20 + l / 1000 * 500 + 1) {
for (int t = 0; t < 10; t++) {
string s = rand_string(std::numeric_limits<char>::min(), std::numeric_limits<char>::max(), l);
@ -139,16 +163,6 @@ TEST(Misc, base64) {
ASSERT_TRUE(base64_encode(" /'.;.';≤.];,].',[.;/,.;/]/..;!@#!*(%?::;!%\";") ==
"ICAgICAgLycuOy4nO+KJpC5dOyxdLicsWy47LywuOy9dLy4uOyFAIyEqKCU/"
"Ojo7ISUiOw==");
ASSERT_TRUE(is_base64("dGVzdA==") == true);
ASSERT_TRUE(is_base64("dGVzdB==") == false);
ASSERT_TRUE(is_base64("dGVzdA=") == false);
ASSERT_TRUE(is_base64("dGVzdA") == false);
ASSERT_TRUE(is_base64("dGVz") == true);
ASSERT_TRUE(is_base64("") == true);
ASSERT_TRUE(is_base64("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/") == true);
ASSERT_TRUE(is_base64("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=") == false);
ASSERT_TRUE(is_base64("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-/") == false);
ASSERT_TRUE(is_base64("====") == false);
}
TEST(Misc, to_integer) {