mirror of
https://github.com/Dushistov/sdcv.git
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86 lines
1.8 KiB
C++
86 lines
1.8 KiB
C++
#pragma once
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_MMAP
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# include <sys/types.h>
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# include <fcntl.h>
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# include <sys/mman.h>
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#endif
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#ifdef _WIN32
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# include <windows.h>
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#endif
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#include <glib.h>
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class MapFile {
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public:
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MapFile() {}
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~MapFile();
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MapFile(const MapFile&) = delete;
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MapFile& operator=(const MapFile&) = delete;
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bool open(const char *file_name, unsigned long file_size);
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gchar *begin() { return data; }
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private:
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char *data = nullptr;
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unsigned long size = 0ul;
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#ifdef HAVE_MMAP
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int mmap_fd = -1;
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#elif defined(_WIN32)
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HANDLE hFile = 0;
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HANDLE hFileMap = 0;
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#endif
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};
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inline bool MapFile::open(const char *file_name, unsigned long file_size)
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{
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size=file_size;
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#ifdef HAVE_MMAP
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if ((mmap_fd = ::open(file_name, O_RDONLY)) < 0) {
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//g_print("Open file %s failed!\n",fullfilename);
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return false;
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}
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data = (gchar *)mmap( nullptr, file_size, PROT_READ, MAP_SHARED, mmap_fd, 0);
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if ((void *)data == (void *)(-1)) {
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//g_print("mmap file %s failed!\n",idxfilename);
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data=nullptr;
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return false;
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}
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#elif defined( _WIN32)
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hFile = CreateFile(file_name, GENERIC_READ, 0, nullptr, OPEN_ALWAYS,
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FILE_ATTRIBUTE_NORMAL, 0);
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hFileMap = CreateFileMapping(hFile, nullptr, PAGE_READONLY, 0,
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file_size, nullptr);
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data = (gchar *)MapViewOfFile(hFileMap, FILE_MAP_READ, 0, 0, file_size);
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#else
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gsize read_len;
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if (!g_file_get_contents(file_name, &data, &read_len, nullptr))
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return false;
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if (read_len != file_size)
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return false;
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#endif
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return true;
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}
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inline MapFile::~MapFile()
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{
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if (!data)
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return;
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#ifdef HAVE_MMAP
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munmap(data, size);
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close(mmap_fd);
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#else
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# ifdef _WIN32
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UnmapViewOfFile(data);
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CloseHandle(hFileMap);
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CloseHandle(hFile);
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# else
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g_free(data);
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# endif
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#endif
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}
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