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#include "chunk.h"
#include "headers.h"
#include <util/string/cast.h>
#include <util/generic/utility.h>
#include <util/generic/yexception.h>
static inline size_t ParseHex(const TString& s) {
if (s.empty()) {
ythrow yexception() << "can not parse chunk length(empty string)";
}
size_t ret = 0;
for (TString::const_iterator c = s.begin(); c != s.end(); ++c) {
const char ch = *c;
if (ch >= '0' && ch <= '9') {
ret *= 16;
ret += ch - '0';
} else if (ch >= 'a' && ch <= 'f') {
ret *= 16;
ret += 10 + ch - 'a';
} else if (ch >= 'A' && ch <= 'F') {
ret *= 16;
ret += 10 + ch - 'A';
} else if (ch == ';') {
break;
} else if (isspace(ch)) {
continue;
} else {
ythrow yexception() << "can not parse chunk length(" << s.data() << ")";
}
}
return ret;
}
static inline char* ToHex(size_t len, char* buf) {
do {
const size_t val = len % 16;
*--buf = (val < 10) ? (val + '0') : (val - 10 + 'a');
len /= 16;
} while (len);
return buf;
}
class TChunkedInput::TImpl {
public:
inline TImpl(IInputStream* slave, TMaybe<THttpHeaders>* trailers)
: Slave_(slave)
, Trailers_(trailers)
, Pending_(0)
, LastChunkReaded_(false)
{
if (Trailers_) {
Trailers_->Clear();
}
}
inline ~TImpl() {
}
inline size_t Read(void* buf, size_t len) {
return Perform(len, [this, buf](size_t toRead) { return Slave_->Read(buf, toRead); });
}
inline size_t Skip(size_t len) {
return Perform(len, [this](size_t toSkip) { return Slave_->Skip(toSkip); });
}
private:
template <class Operation>
inline size_t Perform(size_t len, const Operation& operation) {
if (!HavePendingData()) {
return 0;
}
const size_t toProcess = Min(Pending_, len);
if (toProcess) {
const size_t processed = operation(toProcess);
if (!processed) {
ythrow yexception() << "malformed http chunk";
}
Pending_ -= processed;
return processed;
}
return 0;
}
inline bool HavePendingData() {
if (LastChunkReaded_) {
return false;
}
if (!Pending_) {
if (!ProceedToNextChunk()) {
return false;
}
}
return true;
}
inline bool ProceedToNextChunk() {
TString len(Slave_->ReadLine());
if (len.empty()) {
/*
* skip crlf from previous chunk
*/
len = Slave_->ReadLine();
}
Pending_ = ParseHex(len);
if (Pending_) {
return true;
}
if (Trailers_) {
Trailers_->ConstructInPlace(Slave_);
}
LastChunkReaded_ = true;
return false;
}
private:
IInputStream* Slave_;
TMaybe<THttpHeaders>* Trailers_;
size_t Pending_;
bool LastChunkReaded_;
};
TChunkedInput::TChunkedInput(IInputStream* slave, TMaybe<THttpHeaders>* trailers)
: Impl_(new TImpl(slave, trailers))
{
}
TChunkedInput::~TChunkedInput() {
}
size_t TChunkedInput::DoRead(void* buf, size_t len) {
return Impl_->Read(buf, len);
}
size_t TChunkedInput::DoSkip(size_t len) {
return Impl_->Skip(len);
}
class TChunkedOutput::TImpl {
typedef IOutputStream::TPart TPart;
public:
inline TImpl(IOutputStream* slave)
: Slave_(slave)
{
}
inline ~TImpl() {
}
inline void Write(const void* buf, size_t len) {
const char* ptr = (const char*)buf;
while (len) {
const size_t portion = Min<size_t>(len, 1024 * 16);
WriteImpl(ptr, portion);
ptr += portion;
len -= portion;
}
}
inline void WriteImpl(const void* buf, size_t len) {
char tmp[32];
char* e = tmp + sizeof(tmp);
char* b = ToHex(len, e);
const TPart parts[] = {
TPart(b, e - b),
TPart::CrLf(),
TPart(buf, len),
TPart::CrLf(),
};
Slave_->Write(parts, sizeof(parts) / sizeof(*parts));
}
inline void Flush() {
Slave_->Flush();
}
inline void Finish() {
Slave_->Write("0\r\n\r\n", 5);
Flush();
}
private:
IOutputStream* Slave_;
};
TChunkedOutput::TChunkedOutput(IOutputStream* slave)
: Impl_(new TImpl(slave))
{
}
TChunkedOutput::~TChunkedOutput() {
try {
Finish();
} catch (...) {
}
}
void TChunkedOutput::DoWrite(const void* buf, size_t len) {
if (Impl_.Get()) {
Impl_->Write(buf, len);
} else {
ythrow yexception() << "can not write to finished stream";
}
}
void TChunkedOutput::DoFlush() {
if (Impl_.Get()) {
Impl_->Flush();
}
}
void TChunkedOutput::DoFinish() {
if (Impl_.Get()) {
Impl_->Finish();
Impl_.Destroy();
}
}
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