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220 lines
8.3 KiB
220 lines
8.3 KiB
// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
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// Licensed under the MIT License:
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#ifndef CAPNP_BLOB_H_
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#define CAPNP_BLOB_H_
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#if defined(__GNUC__) && !defined(CAPNP_HEADER_WARNINGS)
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#pragma GCC system_header
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#endif
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#include <kj/common.h>
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#include <kj/string.h>
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#include "common.h"
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#include <string.h>
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namespace capnp {
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struct Data {
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Data() = delete;
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class Reader;
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class Builder;
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class Pipeline {};
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};
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struct Text {
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Text() = delete;
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class Reader;
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class Builder;
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class Pipeline {};
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};
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class Data::Reader: public kj::ArrayPtr<const byte> {
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// Points to a blob of bytes. The usual Reader rules apply -- Data::Reader behaves like a simple
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// pointer which does not own its target, can be passed by value, etc.
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public:
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typedef Data Reads;
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Reader() = default;
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inline Reader(decltype(nullptr)): ArrayPtr<const byte>(nullptr) {}
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inline Reader(const byte* value, size_t size): ArrayPtr<const byte>(value, size) {}
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inline Reader(const kj::Array<const byte>& value): ArrayPtr<const byte>(value) {}
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inline Reader(const ArrayPtr<const byte>& value): ArrayPtr<const byte>(value) {}
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inline Reader(const kj::Array<byte>& value): ArrayPtr<const byte>(value) {}
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inline Reader(const ArrayPtr<byte>& value): ArrayPtr<const byte>(value) {}
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};
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class Text::Reader: public kj::StringPtr {
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// Like Data::Reader, but points at NUL-terminated UTF-8 text. The NUL terminator is not counted
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// in the size but must be present immediately after the last byte.
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//
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// Text::Reader's interface contract is that its data MUST be NUL-terminated. The producer of
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// the Text::Reader must guarantee this, so that the consumer need not check. The data SHOULD
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// also be valid UTF-8, but this is NOT guaranteed -- the consumer must verify if it cares.
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public:
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typedef Text Reads;
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Reader() = default;
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inline Reader(decltype(nullptr)): StringPtr(nullptr) {}
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inline Reader(const char* value): StringPtr(value) {}
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inline Reader(const char* value, size_t size): StringPtr(value, size) {}
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inline Reader(const kj::String& value): StringPtr(value) {}
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inline Reader(const StringPtr& value): StringPtr(value) {}
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#if KJ_COMPILER_SUPPORTS_STL_STRING_INTEROP
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template <typename T, typename = decltype(kj::instance<T>().c_str())>
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inline Reader(const T& t): StringPtr(t) {}
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// Allow implicit conversion from any class that has a c_str() method (namely, std::string).
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// We use a template trick to detect std::string in order to avoid including the header for
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// those who don't want it.
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#endif
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};
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class Data::Builder: public kj::ArrayPtr<byte> {
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// Like Data::Reader except the pointers aren't const.
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public:
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typedef Data Builds;
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Builder() = default;
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inline Builder(decltype(nullptr)): ArrayPtr<byte>(nullptr) {}
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inline Builder(byte* value, size_t size): ArrayPtr<byte>(value, size) {}
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inline Builder(kj::Array<byte>& value): ArrayPtr<byte>(value) {}
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inline Builder(ArrayPtr<byte> value): ArrayPtr<byte>(value) {}
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inline Data::Reader asReader() const { return Data::Reader(*this); }
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inline operator Reader() const { return asReader(); }
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};
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class Text::Builder: public kj::DisallowConstCopy {
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// Basically identical to kj::StringPtr, except that the contents are non-const.
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public:
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inline Builder(): content(nulstr, 1) {}
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inline Builder(decltype(nullptr)): content(nulstr, 1) {}
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inline Builder(char* value): content(value, strlen(value) + 1) {}
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inline Builder(char* value, size_t size): content(value, size + 1) {
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KJ_IREQUIRE(value[size] == '\0', "StringPtr must be NUL-terminated.");
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}
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inline Reader asReader() const { return Reader(content.begin(), content.size() - 1); }
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inline operator Reader() const { return asReader(); }
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inline operator kj::ArrayPtr<char>();
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inline kj::ArrayPtr<char> asArray();
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inline operator kj::ArrayPtr<const char>() const;
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inline kj::ArrayPtr<const char> asArray() const;
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inline kj::ArrayPtr<byte> asBytes() { return asArray().asBytes(); }
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inline kj::ArrayPtr<const byte> asBytes() const { return asArray().asBytes(); }
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// Result does not include NUL terminator.
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inline operator kj::StringPtr() const;
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inline kj::StringPtr asString() const;
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inline const char* cStr() const { return content.begin(); }
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// Returns NUL-terminated string.
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inline size_t size() const { return content.size() - 1; }
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// Result does not include NUL terminator.
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inline char operator[](size_t index) const { return content[index]; }
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inline char& operator[](size_t index) { return content[index]; }
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inline char* begin() { return content.begin(); }
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inline char* end() { return content.end() - 1; }
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inline const char* begin() const { return content.begin(); }
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inline const char* end() const { return content.end() - 1; }
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inline bool operator==(decltype(nullptr)) const { return content.size() <= 1; }
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inline bool operator!=(decltype(nullptr)) const { return content.size() > 1; }
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inline bool operator==(Builder other) const { return asString() == other.asString(); }
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inline bool operator!=(Builder other) const { return asString() != other.asString(); }
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inline bool operator< (Builder other) const { return asString() < other.asString(); }
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inline bool operator> (Builder other) const { return asString() > other.asString(); }
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inline bool operator<=(Builder other) const { return asString() <= other.asString(); }
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inline bool operator>=(Builder other) const { return asString() >= other.asString(); }
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inline kj::StringPtr slice(size_t start) const;
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inline kj::ArrayPtr<const char> slice(size_t start, size_t end) const;
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inline Builder slice(size_t start);
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inline kj::ArrayPtr<char> slice(size_t start, size_t end);
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// A string slice is only NUL-terminated if it is a suffix, so slice() has a one-parameter
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// version that assumes end = size().
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private:
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inline explicit Builder(kj::ArrayPtr<char> content): content(content) {}
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kj::ArrayPtr<char> content;
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static char nulstr[1];
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};
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inline kj::StringPtr KJ_STRINGIFY(Text::Builder builder) {
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return builder.asString();
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}
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inline bool operator==(const char* a, const Text::Builder& b) { return a == b.asString(); }
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inline bool operator!=(const char* a, const Text::Builder& b) { return a != b.asString(); }
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inline Text::Builder::operator kj::StringPtr() const {
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return kj::StringPtr(content.begin(), content.size() - 1);
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}
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inline kj::StringPtr Text::Builder::asString() const {
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return kj::StringPtr(content.begin(), content.size() - 1);
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}
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inline Text::Builder::operator kj::ArrayPtr<char>() {
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return content.slice(0, content.size() - 1);
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}
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inline kj::ArrayPtr<char> Text::Builder::asArray() {
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return content.slice(0, content.size() - 1);
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}
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inline Text::Builder::operator kj::ArrayPtr<const char>() const {
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return content.slice(0, content.size() - 1);
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}
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inline kj::ArrayPtr<const char> Text::Builder::asArray() const {
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return content.slice(0, content.size() - 1);
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}
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inline kj::StringPtr Text::Builder::slice(size_t start) const {
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return asReader().slice(start);
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}
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inline kj::ArrayPtr<const char> Text::Builder::slice(size_t start, size_t end) const {
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return content.slice(start, end);
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}
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inline Text::Builder Text::Builder::slice(size_t start) {
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return Text::Builder(content.slice(start, content.size()));
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}
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inline kj::ArrayPtr<char> Text::Builder::slice(size_t start, size_t end) {
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return content.slice(start, end);
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}
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} // namespace capnp
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#endif // CAPNP_BLOB_H_
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