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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| #include "memorymappedfilestream.h" | ||
| #include "../log.h" | ||
|
|
||
| #include <cstring> | ||
| #include <algorithm> | ||
| #include <system_error> | ||
|
|
||
| namespace Impacto { | ||
| namespace Io { | ||
| template <AccessMode M> | ||
| IoError MemoryMappedFileStream<M>::Create(std::string const& fileName, | ||
| Stream** out) { | ||
| MemoryMappedFileStream* result = | ||
| new MemoryMappedFileStream(GetSystemDependentPath(fileName)); | ||
| result->Meta.Size = GetFileSize(result->SourceFileName); | ||
| if (result->Meta.Size == IoError_Fail) { | ||
| delete result; | ||
| return IoError_Fail; | ||
| } | ||
|
|
||
| std::error_code ec; | ||
| result->mmapFile.map(result->SourceFileName, 0, result->Meta.Size, ec); | ||
| if (ec) { | ||
| ImpLog(LL_Error, LC_IO, "Failed to open file \"%s\", error:\"%s\"\n", | ||
| result->SourceFileName.c_str(), ec.message().c_str()); | ||
| delete result; | ||
| return ec == std::errc::no_such_file_or_directory ? IoError_Eof | ||
| : IoError_Fail; | ||
| } | ||
| *out = (Stream*)result; | ||
| return IoError_OK; | ||
| } | ||
|
|
||
| template <AccessMode M> | ||
| int64_t MemoryMappedFileStream<M>::Read(void* buffer, int64_t sz) { | ||
| if (sz < 0) return IoError_Fail; | ||
| if (Position >= Meta.Size) return IoError_Eof; | ||
|
|
||
| int bytesToRead = std::min(sz, Meta.Size - Position); | ||
| assert(mmapFile.data()); | ||
| // Lock only if we are in read/write mode | ||
| if constexpr (M == AccessMode::write) { | ||
| std::shared_lock lock(*mutexLock); // Lock for shared read access | ||
| memcpy(buffer, mmapFile.data() + Position, bytesToRead); | ||
| } else { | ||
| memcpy(buffer, mmapFile.data() + Position, bytesToRead); | ||
| } | ||
|
|
||
| Position += bytesToRead; | ||
| return bytesToRead; | ||
| } | ||
|
|
||
| template <AccessMode M> | ||
| int64_t MemoryMappedFileStream<M>::Seek(int64_t offset, int origin) { | ||
| int64_t absPos; | ||
| switch (origin) { | ||
| case RW_SEEK_SET: | ||
| absPos = offset; | ||
| break; | ||
| case RW_SEEK_CUR: | ||
| absPos = Position + offset; | ||
| break; | ||
| case RW_SEEK_END: | ||
| absPos = Meta.Size - offset; | ||
| break; | ||
| } | ||
|
|
||
| if (absPos < 0 || absPos > Meta.Size) return IoError_Fail; | ||
| Position = absPos; | ||
| return Position; | ||
| } | ||
|
|
||
| template <AccessMode M> | ||
| IoError MemoryMappedFileStream<M>::Duplicate(Stream** outStream) { | ||
| MemoryMappedFileStream* result = new MemoryMappedFileStream(*this); | ||
| if (result->Seek(Position, RW_SEEK_SET) < 0) { | ||
| ImpLog(LL_Error, LC_IO, "Seek failed for file \"%s\"\n", | ||
| SourceFileName.c_str()); | ||
| delete result; | ||
| return IoError_Fail; | ||
| } | ||
| *outStream = (Stream*)result; | ||
| return IoError_OK; | ||
| } | ||
|
|
||
| template <AccessMode M> | ||
| int64_t MemoryMappedFileStream<M>::Write(void* buffer, int64_t sz, int cnt) { | ||
| if constexpr (M == AccessMode::read) { | ||
| assert(false); | ||
| return 0; | ||
| } else { | ||
| std::lock_guard<std::shared_mutex> lock(*mutexLock); | ||
| sz = std::min(Meta.Size - Position, sz); | ||
| memcpy(mmapFile.data() + Position, buffer, sz); | ||
| Position += sz; | ||
| return sz; | ||
| } | ||
| } | ||
|
|
||
| template class MemoryMappedFileStream<AccessMode::write>; | ||
| template class MemoryMappedFileStream<AccessMode::read>; | ||
|
|
||
| } // namespace Io | ||
| } // namespace Impacto |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| #pragma once | ||
|
|
||
| #include "stream.h" | ||
| #include <fstream> | ||
| #include <cstddef> | ||
| #include <shared_mutex> | ||
| #include "../../vendor/mio/mio.hpp" | ||
|
|
||
| namespace Impacto { | ||
| namespace Io { | ||
|
|
||
| using AccessMode = mio::access_mode; | ||
|
|
||
| template <AccessMode Access> | ||
| class MemoryMappedFileStream : public Stream { | ||
| public: | ||
| AccessMode Mode = Access; | ||
| static IoError Create(std::string const& fileName, Stream** out); | ||
| int64_t Read(void* buffer, int64_t sz) override; | ||
| int64_t Seek(int64_t offset, int origin) override; | ||
| IoError Duplicate(Stream** outStream) override; | ||
| int64_t Write(void* buffer, int64_t sz, int cnt = 1) override; | ||
|
|
||
| protected: | ||
| MemoryMappedFileStream(std::string filePath) | ||
| : SourceFileName(std::move(filePath)) { | ||
| Meta.FileName = SourceFileName; | ||
| if constexpr (Access == AccessMode::write) { | ||
| mutexLock = std::make_shared<std::shared_mutex>(); | ||
| } | ||
| } | ||
|
|
||
| MemoryMappedFileStream(MemoryMappedFileStream const& other) | ||
| : SourceFileName(other.SourceFileName), mmapFile(other.mmapFile) { | ||
| Meta.FileName = SourceFileName; | ||
| Meta.Size = other.Meta.Size; | ||
| if constexpr (Access == AccessMode::write) { | ||
| mutexLock = other.mutexLock; | ||
| } | ||
| } | ||
| std::string SourceFileName; | ||
| mio::basic_shared_mmap<Access, std::byte> mmapFile; | ||
| std::shared_ptr<std::shared_mutex> mutexLock; | ||
| }; | ||
| } // namespace Io | ||
| } // namespace Impacto |
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