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Diffstat (limited to 'src/lib/util/ioprocs.cpp')
-rw-r--r-- | src/lib/util/ioprocs.cpp | 982 |
1 files changed, 982 insertions, 0 deletions
diff --git a/src/lib/util/ioprocs.cpp b/src/lib/util/ioprocs.cpp new file mode 100644 index 00000000000..687968f85ee --- /dev/null +++ b/src/lib/util/ioprocs.cpp @@ -0,0 +1,982 @@ +// license:BSD-3-Clause +// copyright-holders:Vas Crabb +/*************************************************************************** + + ioprocs.cpp + + I/O interface implementations for RAM, C standard I/O and OSD files + +***************************************************************************/ + +#include "ioprocs.h" + +#include "ioprocsfill.h" + +#include "osdfile.h" + +#include <algorithm> +#include <cassert> +#include <cerrno> +#include <cstring> +#include <iterator> +#include <limits> +#include <new> +#include <type_traits> + + +namespace util { + +namespace { + +// helper for holding a block of memory and deallocating it (or not) as necessary + +template <typename T, bool Owned> +class ram_adapter_base : public virtual random_access +{ +public: + virtual ~ram_adapter_base() + { + if constexpr (Owned) + std::free(m_data); + } + + virtual std::error_condition seek(std::int64_t offset, int whence) noexcept override + { + switch (whence) + { + case SEEK_SET: + if (0 > offset) + return std::errc::invalid_argument; + m_pointer = std::uint64_t(offset); + return std::error_condition(); + + case SEEK_CUR: + if (0 > offset) + { + if (std::uint64_t(-offset) > m_pointer) + return std::errc::invalid_argument; + } + else if ((std::numeric_limits<std::uint64_t>::max() - offset) < m_pointer) + { + return std::errc::invalid_argument; + } + m_pointer += offset; + return std::error_condition(); + + case SEEK_END: + if (0 > offset) + { + if (std::uint64_t(-offset) > m_size) + return std::errc::invalid_argument; + } + else if ((std::numeric_limits<std::uint64_t>::max() - offset) < m_size) + { + return std::errc::invalid_argument; + } + m_pointer = std::uint64_t(m_size) + offset; + return std::error_condition(); + + default: + return std::errc::invalid_argument; + } + } + + virtual std::error_condition tell(std::uint64_t &result) noexcept override + { + result = m_pointer; + return std::error_condition(); + } + + virtual std::error_condition length(std::uint64_t &result) noexcept override + { + if (std::numeric_limits<uint64_t>::max() < m_size) + return std::errc::file_too_large; + + result = m_size; + return std::error_condition(); + } + +protected: + template <typename U> + ram_adapter_base(U *data, std::size_t size) noexcept : m_data(reinterpret_cast<T>(data)), m_size(size) + { + static_assert(sizeof(*m_data) == 1U, "Element type must be byte-sized"); + assert(m_data || !m_size); + } + + T m_data; + std::uint64_t m_pointer = 0U; + std::size_t m_size; +}; + + +// RAM read implementation + +template <typename T, bool Owned> +class ram_read_adapter : public ram_adapter_base<T, Owned>, public virtual random_read +{ +public: + template <typename U> + ram_read_adapter(U *data, std::size_t size) noexcept : ram_adapter_base<T, Owned>(data, size) + { + } + + virtual std::error_condition read_some(void *buffer, std::size_t length, std::size_t &actual) noexcept override + { + do_read(this->m_pointer, buffer, length, actual); + this->m_pointer += actual; + return std::error_condition(); + } + + virtual std::error_condition read_some_at(std::uint64_t offset, void *buffer, std::size_t length, std::size_t &actual) noexcept override + { + do_read(offset, buffer, length, actual); + return std::error_condition(); + } + +private: + void do_read(std::uint64_t offset, void *buffer, std::size_t length, std::size_t &actual) const noexcept + { + if ((offset < this->m_size) && length) + { + actual = std::min(std::size_t(this->m_size - offset), length); + if constexpr (Owned) + std::memcpy(buffer, this->m_data + offset, actual); + else + std::memmove(buffer, this->m_data + offset, actual); + } + else + { + actual = 0U; + } + } +}; + + +// helper for holding a stdio FILE and closing it (or not) as necessary + +class stdio_adapter_base : public virtual random_access +{ +public: + virtual ~stdio_adapter_base() + { + if (m_close) + std::fclose(m_file); + } + + virtual std::error_condition seek(std::int64_t offset, int whence) noexcept override + { + if ((std::numeric_limits<long>::max() < offset) || (std::numeric_limits<long>::min() > offset)) + return std::errc::invalid_argument; + else if (!std::fseek(m_file, long(offset), whence)) + return std::error_condition(); + else + return std::error_condition(errno, std::generic_category()); + } + + virtual std::error_condition tell(std::uint64_t &result) noexcept override + { + long const pos = std::ftell(m_file); + if (0 > pos) + return std::error_condition(errno, std::generic_category()); + result = static_cast<unsigned long>(pos); + return std::error_condition(); + } + + virtual std::error_condition length(std::uint64_t &result) noexcept override + { + std::fpos_t oldpos; + if (std::fgetpos(m_file, &oldpos)) + return std::error_condition(errno, std::generic_category()); + + long endpos = -1; + if (!std::fseek(m_file, 0, SEEK_END)) + { + m_dangling_read = m_dangling_write = false; + endpos = std::ftell(m_file); + } + std::error_condition err; + if (0 > endpos) + err.assign(errno, std::generic_category()); + else if (std::numeric_limits<std::uint64_t>::max() < static_cast<unsigned long>(endpos)) + err = std::errc::file_too_large; + else + result = static_cast<unsigned long>(endpos); + + if (!std::fsetpos(m_file, &oldpos)) + m_dangling_read = m_dangling_write = false; + else if (!err) + err.assign(errno, std::generic_category()); + + return err; + } + +protected: + stdio_adapter_base(FILE *file, bool close) noexcept : m_file(file), m_close(close) + { + assert(m_file); + } + + FILE *file() noexcept + { + return m_file; + } + +private: + FILE *const m_file; + bool const m_close; + +protected: + bool m_dangling_read = true, m_dangling_write = true; +}; + + +// stdio read implementation + +class stdio_read_adapter : public stdio_adapter_base, public virtual random_read +{ +public: + stdio_read_adapter(FILE *file, bool close) noexcept : stdio_adapter_base(file, close) + { + } + + virtual std::error_condition read_some(void *buffer, std::size_t length, std::size_t &actual) noexcept override + { + if (m_dangling_write) + { + if (std::fflush(file())) + { + std::clearerr(file()); + actual = 0U; + return std::error_condition(errno, std::generic_category()); + } + m_dangling_write = false; + } + + actual = std::fread(buffer, sizeof(std::uint8_t), length, file()); + m_dangling_read = true; + if (length != actual) + { + if (std::ferror(file())) + { + std::clearerr(file()); + return std::error_condition(errno, std::generic_category()); + } + else if (std::feof(file())) + { + m_dangling_read = false; + } + } + + return std::error_condition(); + } + + virtual std::error_condition read_some_at(std::uint64_t offset, void *buffer, std::size_t length, std::size_t &actual) noexcept override + { + actual = 0U; + + if (static_cast<unsigned long>(std::numeric_limits<long>::max()) < offset) + return std::errc::invalid_argument; + + std::fpos_t oldpos; + if (std::fgetpos(file(), &oldpos)) + return std::error_condition(errno, std::generic_category()); + + std::error_condition err; + if (std::fseek(file(), long(static_cast<unsigned long>(offset)), SEEK_SET)) + { + err.assign(errno, std::generic_category()); + } + else + { + m_dangling_write = false; + actual = std::fread(buffer, sizeof(std::uint8_t), length, file()); + m_dangling_read = true; + if (length != actual) + { + if (std::ferror(file())) + { + err.assign(errno, std::generic_category()); + std::clearerr(file()); + } + else if (std::feof(file())) + { + m_dangling_read = false; + } + } + } + + if (!std::fsetpos(file(), &oldpos)) + m_dangling_read = m_dangling_write = false; + else if (!err) + err.assign(errno, std::generic_category()); + + return err; + } +}; + + +// stdio read/write implementation + +class stdio_read_write_adapter : public stdio_read_adapter, public random_read_write +{ +public: + using stdio_read_adapter::stdio_read_adapter; + + virtual std::error_condition finalize() noexcept override + { + return std::error_condition(); + } + + virtual std::error_condition flush() noexcept override + { + if (std::fflush(file())) + { + std::clearerr(file()); + return std::error_condition(errno, std::generic_category()); + } + m_dangling_write = false; + return std::error_condition(); + } + + virtual std::error_condition write_some(void const *buffer, std::size_t length, std::size_t &actual) noexcept override + { + if (m_dangling_read) + { + if (std::fseek(file(), 0, SEEK_CUR)) + { + actual = 0U; + return std::error_condition(errno, std::generic_category()); + } + m_dangling_read = false; + } + + actual = std::fwrite(buffer, sizeof(std::uint8_t), length, file()); + m_dangling_write = true; + if (length != actual) + { + std::clearerr(file()); + return std::error_condition(errno, std::generic_category()); + } + + return std::error_condition(); + } + + virtual std::error_condition write_some_at(std::uint64_t offset, void const *buffer, std::size_t length, std::size_t &actual) noexcept override + { + actual = 0U; + + if (static_cast<unsigned long>(std::numeric_limits<long>::max()) < offset) + return std::errc::invalid_argument; + + std::fpos_t oldpos; + if (std::fgetpos(file(), &oldpos)) + return std::error_condition(errno, std::generic_category()); + + std::error_condition err; + if (std::fseek(file(), long(static_cast<unsigned long>(offset)), SEEK_SET)) + { + err.assign(errno, std::generic_category()); + } + else + { + m_dangling_read = false; + actual = std::fwrite(buffer, sizeof(std::uint8_t), length, file()); + m_dangling_write = true; + if (length != actual) + { + err.assign(errno, std::generic_category()); + std::clearerr(file()); + } + } + + if (!std::fsetpos(file(), &oldpos)) + m_dangling_read = m_dangling_write = false; + else if (!err) + err.assign(errno, std::generic_category()); + + return err; + } +}; + + +// stdio helper that fills space when writing past the end-of-file + +class stdio_read_write_filler : public random_read_fill_wrapper<stdio_read_write_adapter> +{ +public: + stdio_read_write_filler(FILE *file, bool close, std::uint8_t fill) noexcept : random_read_fill_wrapper<stdio_read_write_adapter>(file, close) + { + set_filler(fill); + } + + virtual std::error_condition write_some(void const *buffer, std::size_t length, std::size_t &actual) noexcept override + { + actual = 0U; + + long const offset = std::ftell(file()); + if (0 > offset) + return std::error_condition(errno, std::generic_category()); + + if (std::fseek(file(), 0, SEEK_END)) + { + std::error_condition err(errno, std::generic_category()); + if (!std::fseek(file(), offset, SEEK_SET)) + m_dangling_read = m_dangling_write = false; + return err; + } + m_dangling_read = m_dangling_write = false; + long endpos = std::ftell(file()); + if (0 > endpos) + { + std::error_condition err(errno, std::generic_category()); + std::fseek(file(), offset, SEEK_SET); + return err; + } + + if (offset > endpos) + { + std::uint8_t block[1024]; + std::fill_n( + block, + std::min<std::common_type_t<std::size_t, std::uint64_t, long> >(std::size(block), offset - endpos), + get_filler()); + do + { + std::size_t const chunk = std::min<std::common_type_t<std::size_t, std::uint64_t, long> >(std::size(block), offset - endpos); + std::size_t const filled = std::fwrite(block, sizeof(block[0]), chunk, file()); + endpos += filled; + m_dangling_write = true; + if (chunk != filled) + { + std::error_condition err(errno, std::generic_category()); + std::clearerr(file()); + if (!std::fseek(file(), offset, SEEK_SET)) + m_dangling_write = false; + return err; + } + } + while (static_cast<unsigned long>(endpos) < offset); + } + else if ((offset < endpos) && std::fseek(file(), offset, SEEK_SET)) + { + return std::error_condition(errno, std::generic_category()); + } + + actual = std::fwrite(buffer, sizeof(std::uint8_t), length, file()); + m_dangling_write = true; + if (length != actual) + { + std::clearerr(file()); + return std::error_condition(errno, std::generic_category()); + } + + return std::error_condition(); + } + + virtual std::error_condition write_some_at(std::uint64_t offset, void const *buffer, std::size_t length, std::size_t &actual) noexcept override + { + actual = 0U; + + if (static_cast<unsigned long>(std::numeric_limits<long>::max()) < offset) + return std::errc::invalid_argument; + + std::fpos_t oldpos; + if (std::fgetpos(file(), &oldpos)) + return std::error_condition(errno, std::generic_category()); + + std::error_condition err; + if (std::fseek(file(), 0, SEEK_END)) + { + err.assign(errno, std::generic_category()); + } + else + { + m_dangling_read = m_dangling_write = false; + long endpos = std::ftell(file()); + if (0 > endpos) + { + err.assign(errno, std::generic_category()); + } + else if (static_cast<unsigned long>(endpos) > offset) + { + if (std::fseek(file(), long(static_cast<unsigned long>(offset)), SEEK_SET)) + err.assign(errno, std::generic_category()); + } + else if (static_cast<unsigned long>(endpos) < offset) + { + std::uint8_t block[1024]; + std::fill_n( + block, + std::min<std::common_type_t<std::size_t, std::uint64_t, long> >(std::size(block), offset - endpos), + get_filler()); + do + { + std::size_t const chunk = std::min<std::common_type_t<std::size_t, std::uint64_t, long> >(std::size(block), offset - endpos); + std::size_t const filled = std::fwrite(block, sizeof(block[0]), chunk, file()); + endpos += filled; + m_dangling_write = true; + if (chunk != filled) + { + err.assign(errno, std::generic_category()); + std::clearerr(file()); + } + } + while (!err && (static_cast<unsigned long>(endpos) < offset)); + } + } + + if (!err) + { + actual = std::fwrite(buffer, sizeof(std::uint8_t), length, file()); + m_dangling_write = true; + if (length != actual) + { + err.assign(errno, std::generic_category()); + std::clearerr(file()); + } + } + + if (!std::fsetpos(file(), &oldpos)) + m_dangling_read = m_dangling_write = false; + else if (!err) + err.assign(errno, std::generic_category()); + + return err; + } +}; + + +// helper class for holding an osd_file and closing it (or not) as necessary + +class osd_file_adapter_base : public virtual random_access +{ +public: + virtual ~osd_file_adapter_base() + { + if (m_close) + delete m_file; + } + + virtual std::error_condition seek(std::int64_t offset, int whence) noexcept override + { + switch (whence) + { + case SEEK_SET: + if (0 > offset) + return std::errc::invalid_argument; + m_pointer = std::uint64_t(offset); + return std::error_condition(); + + case SEEK_CUR: + if (0 > offset) + { + if (std::uint64_t(-offset) > m_pointer) + return std::errc::invalid_argument; + } + else if ((std::numeric_limits<std::uint64_t>::max() - offset) < m_pointer) + { + return std::errc::invalid_argument; + } + m_pointer += offset; + return std::error_condition(); + + // TODO: add SEEK_END when osd_file can support it - should it return a different error? + default: + return std::errc::invalid_argument; + } + } + + virtual std::error_condition tell(std::uint64_t &result) noexcept override + { + result = m_pointer; + return std::error_condition(); + } + + virtual std::error_condition length(std::uint64_t &result) noexcept override + { + // not supported by osd_file + return std::errc::not_supported; // TODO: revisit this error code + } + +protected: + osd_file_adapter_base(osd_file::ptr &&file) noexcept : m_file(file.release()), m_close(true) + { + assert(m_file); + } + + osd_file_adapter_base(osd_file &file) noexcept : m_file(&file), m_close(false) + { + } + + osd_file &file() noexcept + { + return *m_file; + } + + std::uint64_t m_pointer = 0U; + +private: + osd_file *const m_file; + bool const m_close; +}; + + +// osd_file read implementation + +class osd_file_read_adapter : public osd_file_adapter_base, public virtual random_read +{ +public: + osd_file_read_adapter(osd_file::ptr &&file) noexcept : osd_file_adapter_base(std::move(file)) + { + } + + osd_file_read_adapter(osd_file &file) noexcept : osd_file_adapter_base(file) + { + } + + virtual std::error_condition read_some(void *buffer, std::size_t length, std::size_t &actual) noexcept override + { + // actual length not valid on error + std::uint32_t const chunk = std::min<std::common_type_t<std::uint32_t, std::size_t> >(std::numeric_limits<std::uint32_t>::max(), length); + std::uint32_t count; + std::error_condition err = file().read(buffer, m_pointer, chunk, count); + if (!err) + { + m_pointer += count; + actual = std::size_t(count); + } + else + { + actual = 0U; + } + return err; + } + + virtual std::error_condition read_some_at(std::uint64_t offset, void *buffer, std::size_t length, std::size_t &actual) noexcept override + { + // actual length not valid on error + std::uint32_t const chunk = std::min<std::common_type_t<std::uint32_t, std::size_t> >(std::numeric_limits<std::uint32_t>::max(), length); + std::uint32_t count; + std::error_condition err = file().read(buffer, offset, chunk, count); + if (!err) + actual = std::size_t(count); + else + actual = 0U; + return err; + } +}; + + +// osd_file read/write implementation + +class osd_file_read_write_adapter : public osd_file_read_adapter, public random_read_write +{ +public: + using osd_file_read_adapter::osd_file_read_adapter; + + virtual std::error_condition finalize() noexcept override + { + return std::error_condition(); + } + + virtual std::error_condition flush() noexcept override + { + return file().flush(); + } + + virtual std::error_condition write_some(void const *buffer, std::size_t length, std::size_t &actual) noexcept override + { + // actual length not valid on error + std::uint32_t const chunk = std::min<std::common_type_t<std::uint32_t, std::size_t> >(std::numeric_limits<std::uint32_t>::max(), length); + std::uint32_t count; + std::error_condition err = file().write(buffer, m_pointer, chunk, count); + if (!err) + { + actual = std::size_t(count); + m_pointer += count; + } + else + { + actual = 0U; + } + return err; + } + + virtual std::error_condition write_some_at(std::uint64_t offset, void const *buffer, std::size_t length, std::size_t &actual) noexcept override + { + // actual length not valid on error + std::uint32_t const chunk = std::min<std::common_type_t<std::uint32_t, std::size_t> >(std::numeric_limits<std::uint32_t>::max(), length); + std::uint32_t count; + std::error_condition err = file().write(buffer, offset, chunk, count); + if (!err) + actual = std::size_t(count); + else + actual = 0U; + return err; + } +}; + +} // anonymous namespace + + +// helper functions for common patterns + +std::pair<std::error_condition, std::size_t> read(read_stream &stream, void *buffer, std::size_t length) noexcept +{ + std::size_t actual = 0; + do + { + std::size_t count; + std::error_condition err = stream.read_some(buffer, length, count); + actual += count; + if (!err) + { + if (!count) + break; + } + else if (std::errc::interrupted != err) + { + return std::make_pair(err, actual); + } + buffer = reinterpret_cast<std::uint8_t *>(buffer) + count; + length -= count; + } + while (length); + return std::make_pair(std::error_condition(), actual); +} + +std::tuple<std::error_condition, std::unique_ptr<std::uint8_t []>, std::size_t> read(read_stream &stream, std::size_t length) noexcept +{ + std::unique_ptr<std::uint8_t []> buffer(new (std::nothrow) std::uint8_t [length]); + if (!buffer) + return std::make_tuple(std::errc::not_enough_memory, std::move(buffer), std::size_t(0)); + auto [err, actual] = read(stream, buffer.get(), length); + return std::make_tuple(err, std::move(buffer), actual); +} + +std::pair<std::error_condition, std::size_t> read_at(random_read &stream, std::uint64_t offset, void *buffer, std::size_t length) noexcept +{ + std::size_t actual = 0; + do + { + std::size_t count; + std::error_condition err = stream.read_some_at(offset, buffer, length, count); + actual += count; + if (!err) + { + if (!count) + break; + } + else if (std::errc::interrupted != err) + { + return std::make_pair(err, actual); + } + offset += count; + buffer = reinterpret_cast<std::uint8_t *>(buffer) + count; + length -= count; + } + while (length); + return std::make_pair(std::error_condition(), actual); +} + +std::tuple<std::error_condition, std::unique_ptr<std::uint8_t []>, std::size_t> read_at(random_read &stream, std::uint64_t offset, std::size_t length) noexcept +{ + std::unique_ptr<std::uint8_t []> buffer(new (std::nothrow) std::uint8_t [length]); + if (!buffer) + return std::make_tuple(std::errc::not_enough_memory, std::move(buffer), std::size_t(0)); + auto [err, actual] = read_at(stream, offset, buffer.get(), length); + return std::make_tuple(err, std::move(buffer), actual); +} + +std::pair<std::error_condition, std::size_t> write(write_stream &stream, void const *buffer, std::size_t length) noexcept +{ + std::size_t actual = 0; + do + { + std::size_t written; + std::error_condition const err = stream.write_some(buffer, length, written); + assert(written || err || !length); + actual += written; + if (err && (std::errc::interrupted != err)) + return std::make_pair(err, actual); + buffer = reinterpret_cast<std::uint8_t const *>(buffer) + written; + length -= written; + } + while (length); + return std::make_pair(std::error_condition(), actual); +} + +std::pair<std::error_condition, std::size_t> write_at(random_write &stream, std::uint64_t offset, void const *buffer, std::size_t length) noexcept +{ + std::size_t actual = 0; + do + { + std::size_t written; + std::error_condition const err = stream.write_some_at(offset, buffer, length, written); + assert(written || err || !length); + actual += written; + if (err && (std::errc::interrupted != err)) + return std::make_pair(err, actual); + offset += written; + buffer = reinterpret_cast<std::uint8_t const *>(buffer) + written; + length -= written; + } + while (length); + return std::make_pair(std::error_condition(), actual); +} + + +// creating RAM read adapters + +random_read::ptr ram_read(void const *data, std::size_t size) noexcept +{ + random_read::ptr result; + if (data || !size) + result.reset(new (std::nothrow) ram_read_adapter<std::uint8_t const *const, false>(data, size)); + return result; +} + +random_read::ptr ram_read(void const *data, std::size_t size, std::uint8_t filler) noexcept +{ + std::unique_ptr<random_read_fill_wrapper<ram_read_adapter<std::uint8_t const *const, false> > > result; + if (data || !size) + result.reset(new (std::nothrow) decltype(result)::element_type(data, size)); + if (result) + result->set_filler(filler); + return result; +} + +random_read::ptr ram_read_copy(void const *data, std::size_t size) noexcept +{ + random_read::ptr result; + void *const copy = size ? std::malloc(size) : nullptr; + if (copy) + std::memcpy(copy, data, size); + if (copy || !size) + result.reset(new (std::nothrow) ram_read_adapter<std::uint8_t *const, true>(copy, size)); + if (!result) + std::free(copy); + return result; +} + +random_read::ptr ram_read_copy(void const *data, std::size_t size, std::uint8_t filler) noexcept +{ + std::unique_ptr<random_read_fill_wrapper<ram_read_adapter<std::uint8_t *const, true> > > result; + void *const copy = size ? std::malloc(size) : nullptr; + if (copy) + std::memcpy(copy, data, size); + if (copy || !size) + result.reset(new (std::nothrow) decltype(result)::element_type(copy, size)); + if (!result) + std::free(copy); + return result; +} + + +// creating stdio read adapters + +random_read::ptr stdio_read(FILE *file) noexcept +{ + random_read::ptr result; + if (file) + result.reset(new (std::nothrow) stdio_read_adapter(file, true)); + return result; +} + +random_read::ptr stdio_read(FILE *file, std::uint8_t filler) noexcept +{ + std::unique_ptr<random_read_fill_wrapper<stdio_read_adapter> > result; + if (file) + result.reset(new (std::nothrow) decltype(result)::element_type(file, true)); + if (result) + result->set_filler(filler); + return result; +} + +random_read::ptr stdio_read_noclose(FILE *file) noexcept +{ + random_read::ptr result; + if (file) + result.reset(new (std::nothrow) stdio_read_adapter(file, false)); + return result; +} + +random_read::ptr stdio_read_noclose(FILE *file, std::uint8_t filler) noexcept +{ + std::unique_ptr<random_read_fill_wrapper<stdio_read_adapter> > result; + if (file) + result.reset(new (std::nothrow) decltype(result)::element_type(file, false)); + if (result) + result->set_filler(filler); + return result; +} + + +// creating stdio read/write adapters + +random_read_write::ptr stdio_read_write(FILE *file) noexcept +{ + random_read_write::ptr result; + if (file) + result.reset(new (std::nothrow) stdio_read_write_adapter(file, true)); + return result; +} + +random_read_write::ptr stdio_read_write(FILE *file, std::uint8_t filler) noexcept +{ + random_read_write::ptr result; + if (file) + result.reset(new (std::nothrow) stdio_read_write_filler(file, true, filler)); + return result; +} + +random_read_write::ptr stdio_read_write_noclose(FILE *file) noexcept +{ + random_read_write::ptr result; + if (file) + result.reset(new (std::nothrow) stdio_read_write_adapter(file, false)); + return result; +} + +random_read_write::ptr stdio_read_write_noclose(FILE *file, std::uint8_t filler) noexcept +{ + random_read_write::ptr result; + if (file) + result.reset(new (std::nothrow) stdio_read_write_filler(file, false, filler)); + return result; +} + + +// creating osd_file read adapters + +random_read::ptr osd_file_read(osd_file::ptr &&file) noexcept +{ + random_read::ptr result; + if (file) + result.reset(new (std::nothrow) osd_file_read_adapter(std::move(file))); + return result; +} + +random_read::ptr osd_file_read(osd_file &file) noexcept +{ + return random_read::ptr(new (std::nothrow) osd_file_read_adapter(file)); +} + + +// creating osd_file read/write adapters + +random_read_write::ptr osd_file_read_write(osd_file::ptr &&file) noexcept +{ + random_read_write::ptr result; + if (file) + result.reset(new (std::nothrow) osd_file_read_write_adapter(std::move(file))); + return result; +} + +random_read_write::ptr osd_file_read_write(osd_file &file) noexcept +{ + return random_read_write::ptr(new (std::nothrow) osd_file_read_write_adapter(file)); +} + +} // namespace util |