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nghtpx: Add BlockAllocator version of base64

This commit is contained in:
Tatsuhiro Tsujikawa 2016-10-02 10:22:33 +09:00
parent e1a865c406
commit 5aec60fbeb
6 changed files with 90 additions and 43 deletions
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54
src/base64.h
View File

@ -29,6 +29,9 @@
#include <string>
#include "template.h"
#include "allocator.h"
namespace nghttp2 {
namespace base64 {
@ -87,7 +90,8 @@ InputIt next_decode_input(InputIt first, InputIt last, const int *tbl) {
return first;
}
template <typename InputIt> std::string decode(InputIt first, InputIt last) {
template <typename InputIt, typename OutputIt>
OutputIt decode(InputIt first, InputIt last, OutputIt d_first) {
static constexpr int INDEX_TABLE[] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
@ -104,37 +108,29 @@ template <typename InputIt> std::string decode(InputIt first, InputIt last) {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1};
auto len = last - first;
if (len % 4 != 0) {
return "";
}
std::string res;
res.resize(len / 4 * 3);
auto p = std::begin(res);
auto p = d_first;
for (; first != last;) {
uint32_t n = 0;
for (int i = 1; i <= 4; ++i, ++first) {
auto idx = INDEX_TABLE[static_cast<size_t>(*first)];
if (idx == -1) {
if (i <= 2) {
return "";
return d_first;
}
if (i == 3) {
if (*first == '=' && *(first + 1) == '=' && first + 2 == last) {
*p++ = n >> 16;
res.resize(p - std::begin(res));
return res;
return p;
}
return "";
return d_first;
}
if (*first == '=' && first + 1 == last) {
*p++ = n >> 16;
*p++ = n >> 8 & 0xffu;
res.resize(p - std::begin(res));
return res;
return p;
}
return "";
return d_first;
}
n += idx << (24 - i * 6);
@ -145,9 +141,37 @@ template <typename InputIt> std::string decode(InputIt first, InputIt last) {
*p++ = n & 0xffu;
}
return p;
}
template <typename InputIt> std::string decode(InputIt first, InputIt last) {
auto len = std::distance(first, last);
if (len % 4 != 0) {
return "";
}
std::string res;
res.resize(len / 4 * 3);
res.erase(decode(first, last, std::begin(res)), std::end(res));
return res;
}
template <typename InputIt>
StringRef decode(BlockAllocator &balloc, InputIt first, InputIt last) {
auto len = std::distance(first, last);
if (len % 4 != 0) {
return StringRef::from_lit("");
}
auto iov = make_byte_ref(balloc, len / 4 * 3 + 1);
auto p = iov.base;
p = decode(first, last, p);
*p = '\0';
return StringRef{iov.base, p};
}
} // namespace base64
} // namespace nghttp2

12
src/base64_test.cc
View File

@ -59,31 +59,40 @@ void test_base64_encode(void) {
}
void test_base64_decode(void) {
BlockAllocator balloc(4096, 4096);
{
std::string in = "/w==";
auto out = base64::decode(std::begin(in), std::end(in));
CU_ASSERT("\xff" == out);
CU_ASSERT("\xff" == base64::decode(balloc, std::begin(in), std::end(in)));
}
{
std::string in = "//4=";
auto out = base64::decode(std::begin(in), std::end(in));
CU_ASSERT("\xff\xfe" == out);
CU_ASSERT("\xff\xfe" ==
base64::decode(balloc, std::begin(in), std::end(in)));
}
{
std::string in = "//79";
auto out = base64::decode(std::begin(in), std::end(in));
CU_ASSERT("\xff\xfe\xfd" == out);
CU_ASSERT("\xff\xfe\xfd" ==
base64::decode(balloc, std::begin(in), std::end(in)));
}
{
std::string in = "//79/A==";
auto out = base64::decode(std::begin(in), std::end(in));
CU_ASSERT("\xff\xfe\xfd\xfc" == out);
CU_ASSERT("\xff\xfe\xfd\xfc" ==
base64::decode(balloc, std::begin(in), std::end(in)));
}
{
// we check the number of valid input must be multiples of 4
std::string in = "//79=";
auto out = base64::decode(std::begin(in), std::end(in));
CU_ASSERT("" == out);
CU_ASSERT("" == base64::decode(balloc, std::begin(in), std::end(in)));
}
{
// ending invalid character at the boundary of multiples of 4 is
@ -91,18 +100,21 @@ void test_base64_decode(void) {
std::string in = "bmdodHRw\n";
auto out = base64::decode(std::begin(in), std::end(in));
CU_ASSERT("" == out);
CU_ASSERT("" == base64::decode(balloc, std::begin(in), std::end(in)));
}
{
// after seeing '=', subsequent input must be also '='.
std::string in = "//79/A=A";
auto out = base64::decode(std::begin(in), std::end(in));
CU_ASSERT("" == out);
CU_ASSERT("" == base64::decode(balloc, std::begin(in), std::end(in)));
}
{
// additional '=' at the end is bad
std::string in = "//79/A======";
auto out = base64::decode(std::begin(in), std::end(in));
CU_ASSERT("" == out);
CU_ASSERT("" == base64::decode(balloc, std::begin(in), std::end(in)));
}
}

13
src/shrpx_http2_upstream.cc
View File

@ -108,15 +108,16 @@ int on_stream_close_callback(nghttp2_session *session, int32_t stream_id,
int Http2Upstream::upgrade_upstream(HttpsUpstream *http) {
int rv;
auto http2_settings = http->get_downstream()->get_http2_settings().str();
util::to_base64(http2_settings);
auto &balloc = http->get_downstream()->get_block_allocator();
auto settings_payload =
base64::decode(std::begin(http2_settings), std::end(http2_settings));
auto http2_settings = http->get_downstream()->get_http2_settings();
http2_settings = util::to_base64(balloc, http2_settings);
auto settings_payload = base64::decode(balloc, std::begin(http2_settings),
std::end(http2_settings));
rv = nghttp2_session_upgrade2(
session_, reinterpret_cast<const uint8_t *>(settings_payload.c_str()),
settings_payload.size(),
session_, settings_payload.byte(), settings_payload.size(),
http->get_downstream()->request().method == HTTP_HEAD, nullptr);
if (rv != 0) {
if (LOG_ENABLED(INFO)) {

40
src/util.cc
View File

@ -410,22 +410,32 @@ void to_token68(std::string &base64str) {
std::end(base64str));
}
void to_base64(std::string &token68str) {
std::transform(std::begin(token68str), std::end(token68str),
std::begin(token68str), [](char c) {
switch (c) {
case '-':
return '+';
case '_':
return '/';
default:
return c;
}
});
if (token68str.size() & 0x3) {
token68str.append(4 - (token68str.size() & 0x3), '=');
StringRef to_base64(BlockAllocator &balloc, const StringRef &token68str) {
// At most 3 padding '='
auto len = token68str.size() + 3;
auto iov = make_byte_ref(balloc, len + 1);
auto p = iov.base;
p = std::transform(std::begin(token68str), std::end(token68str), p,
[](char c) {
switch (c) {
case '-':
return '+';
case '_':
return '/';
default:
return c;
}
});
auto rem = token68str.size() & 0x3;
if (rem) {
p = std::fill_n(p, 4 - rem, '=');
}
return;
*p = '\0';
return StringRef{iov.base, p};
}
namespace {

3
src/util.h
View File

@ -426,7 +426,8 @@ template <typename T> std::string utox(T n) {
}
void to_token68(std::string &base64str);
void to_base64(std::string &token68str);
StringRef to_base64(BlockAllocator &balloc, const StringRef &token68str);
void show_candidates(const char *unkopt, option *options);

11
src/util_test.cc
View File

@ -114,13 +114,12 @@ void test_util_inp_strlower(void) {
}
void test_util_to_base64(void) {
std::string x = "AAA--B_";
util::to_base64(x);
CU_ASSERT("AAA++B/=" == x);
BlockAllocator balloc(4096, 4096);
x = "AAA--B_B";
util::to_base64(x);
CU_ASSERT("AAA++B/B" == x);
CU_ASSERT("AAA++B/=" ==
util::to_base64(balloc, StringRef::from_lit("AAA--B_")));
CU_ASSERT("AAA++B/B" ==
util::to_base64(balloc, StringRef::from_lit("AAA--B_B")));
}
void test_util_to_token68(void) {