Commit 1e8e9c94 authored by Nick Terrell's avatar Nick Terrell Committed by Facebook Github Bot

Switch uncompressedLength to an Optional<uint64_t>

Summary: Instead of using `UNKNWON_UNCOMPRESSED_LENGTH` use an `Optional`.

Reviewed By: yfeldblum

Differential Revision: D5038919

fbshipit-source-id: 7fb60542277019996be3ff50509df5a5060cb1a0
parent 42c42914
This diff is collapsed.
......@@ -22,6 +22,7 @@
#include <string>
#include <vector>
#include <folly/Optional.h>
#include <folly/Range.h>
#include <folly/io/IOBuf.h>
......@@ -110,7 +111,7 @@ class Codec {
* Return the maximum length of data that may be compressed with this codec.
* NO_COMPRESSION and ZLIB support arbitrary lengths;
* LZ4 supports up to 1.9GiB; SNAPPY supports up to 4GiB.
* May return UNLIMITED_UNCOMPRESSED_LENGTH if unlimited.
* May return UNLIMITED_UNCOMPRESSED_LENGTH (uint64_t(-1)) if unlimited.
*/
uint64_t maxUncompressedLength() const;
......@@ -153,12 +154,11 @@ class Codec {
* Regardless of the behavior of the underlying compressor, uncompressing
* an empty IOBuf chain will return an empty IOBuf chain.
*/
static constexpr uint64_t UNKNOWN_UNCOMPRESSED_LENGTH = uint64_t(-1);
static constexpr uint64_t UNLIMITED_UNCOMPRESSED_LENGTH = uint64_t(-2);
static constexpr uint64_t UNLIMITED_UNCOMPRESSED_LENGTH = uint64_t(-1);
std::unique_ptr<IOBuf> uncompress(
const IOBuf* data,
uint64_t uncompressedLength = UNKNOWN_UNCOMPRESSED_LENGTH);
folly::Optional<uint64_t> uncompressedLength = folly::none);
/**
* Uncompresses data. May involve additional copies compared to the overload
......@@ -167,7 +167,7 @@ class Codec {
*/
std::string uncompress(
StringPiece data,
uint64_t uncompressedLength = UNKNOWN_UNCOMPRESSED_LENGTH);
folly::Optional<uint64_t> uncompressedLength = folly::none);
protected:
explicit Codec(CodecType type);
......@@ -189,7 +189,7 @@ class Codec {
*/
virtual bool canUncompress(
const folly::IOBuf* data,
uint64_t uncompressedLength = UNKNOWN_UNCOMPRESSED_LENGTH) const;
folly::Optional<uint64_t> uncompressedLength = folly::none) const;
private:
// default: no limits (save for special value UNKNOWN_UNCOMPRESSED_LENGTH)
......@@ -197,8 +197,9 @@ class Codec {
// default: doesn't need uncompressed length
virtual bool doNeedsUncompressedLength() const;
virtual std::unique_ptr<IOBuf> doCompress(const folly::IOBuf* data) = 0;
virtual std::unique_ptr<IOBuf> doUncompress(const folly::IOBuf* data,
uint64_t uncompressedLength) = 0;
virtual std::unique_ptr<IOBuf> doUncompress(
const folly::IOBuf* data,
folly::Optional<uint64_t> uncompressedLength) = 0;
// default: an implementation is provided by default to wrap the strings into
// IOBufs and delegate to the IOBuf methods. This incurs a copy of the output
// from IOBuf to string. Implementers, at their discretion, can override
......@@ -206,7 +207,7 @@ class Codec {
virtual std::string doCompressString(StringPiece data);
virtual std::string doUncompressString(
StringPiece data,
uint64_t uncompressedLength);
folly::Optional<uint64_t> uncompressedLength);
CodecType type_;
};
......
......@@ -500,7 +500,7 @@ class CustomCodec : public Codec {
return {prefix_};
}
bool canUncompress(const IOBuf* data, uint64_t) const override {
bool canUncompress(const IOBuf* data, Optional<uint64_t>) const override {
auto clone = data->cloneCoalescedAsValue();
if (clone.length() < prefix_.size()) {
return false;
......@@ -517,7 +517,7 @@ class CustomCodec : public Codec {
std::unique_ptr<IOBuf> doUncompress(
const IOBuf* data,
uint64_t uncompressedLength) override {
Optional<uint64_t> uncompressedLength) override {
EXPECT_TRUE(canUncompress(data, uncompressedLength));
auto clone = data->cloneCoalescedAsValue();
clone.trimStart(prefix_.size());
......@@ -573,9 +573,9 @@ TEST_P(AutomaticCodecTest, canUncompressOneBytes) {
IOBuf buf{IOBuf::CREATE, 1};
buf.append(1);
EXPECT_FALSE(codec_->canUncompress(&buf, 1));
EXPECT_FALSE(codec_->canUncompress(&buf, Codec::UNKNOWN_UNCOMPRESSED_LENGTH));
EXPECT_FALSE(codec_->canUncompress(&buf, folly::none));
EXPECT_FALSE(auto_->canUncompress(&buf, 1));
EXPECT_FALSE(auto_->canUncompress(&buf, Codec::UNKNOWN_UNCOMPRESSED_LENGTH));
EXPECT_FALSE(auto_->canUncompress(&buf, folly::none));
}
INSTANTIATE_TEST_CASE_P(
......
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