Public Access
twislaandClaude Sonnet 5.5
b0e8226943
A streaming JSON scanner (a 33 KB list of releases costs a few hundred bytes), the release reader built on it, HTTP response heads and chunked bodies, URLs, and the decisions: which release is an update, whether to announce it, and which download URLs the device takes. Tested against the real answers of git.twis.la. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT
63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
#pragma once
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#include <cstddef>
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#include <cstdint>
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#include <string>
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namespace roro::release {
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// The status line and headers of an HTTP/1.1 response, read as bytes arrive.
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struct HttpHead {
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int status = 0;
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long contentLength = -1; // -1: not given
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bool chunked = false;
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std::string location, contentType;
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};
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class HttpHeadParser {
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public:
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static constexpr size_t kMaxBytes = 4096;
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// Takes bytes up to and including the blank line that ends the head; returns how many it used.
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// What follows is the body.
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size_t feed(const char* data, size_t len);
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bool complete() const { return complete_; }
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bool failed() const { return failed_; }
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const HttpHead& head() const { return head_; }
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private:
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void line();
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HttpHead head_;
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std::string line_;
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size_t total_ = 0;
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bool first_ = true, complete_ = false, failed_ = false;
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};
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// Takes the chunks of "Transfer-Encoding: chunked" apart as they arrive.
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class ChunkedDecoder {
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public:
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// `out` has room for `len` bytes (the body is never longer than what carried it).
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size_t decode(const uint8_t* in, size_t len, uint8_t* out);
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bool done() const { return state_ == State::Done; }
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bool failed() const { return failed_; }
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private:
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enum class State : uint8_t { Size, Extension, SizeLf, Data, DataCr, DataLf, Trailer, Done };
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State state_ = State::Size;
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size_t remaining_ = 0;
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bool anyDigit_ = false, failed_ = false;
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size_t trailerLine_ = 0;
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};
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// "https://git.twis.la/twisla/x/releases/download/v1/a.ota" taken apart. Only http and https.
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struct Url {
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bool ok = false;
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bool https = false;
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std::string host, path; // path from the first "/", with its query; "/" if none
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int port = 0;
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};
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Url parseUrl(const std::string& url);
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} // namespace roro::release
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