465 lines
16 KiB
C
465 lines
16 KiB
C
/*
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******************************************************************************
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*
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* Copyright (C) 1999-2013, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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******************************************************************************/
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/*----------------------------------------------------------------------------
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*
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* Memory mapped file wrappers for use by the ICU Data Implementation
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* All of the platform-specific implementation for mapping data files
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* is here. The rest of the ICU Data implementation uses only the
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* wrapper functions.
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*
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*----------------------------------------------------------------------------*/
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/* Defines _XOPEN_SOURCE for access to POSIX functions.
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* Must be before any other #includes. */
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#include "uposixdefs.h"
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#include "unicode/putil.h"
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#include "udatamem.h"
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#include "umapfile.h"
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/* memory-mapping base definitions ------------------------------------------ */
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#if MAP_IMPLEMENTATION==MAP_WIN32
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# define WIN32_LEAN_AND_MEAN
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# define VC_EXTRALEAN
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# define NOUSER
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# define NOSERVICE
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# define NOIME
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# define NOMCX
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# include <windows.h>
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# include "cmemory.h"
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typedef HANDLE MemoryMap;
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# define IS_MAP(map) ((map)!=NULL)
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#elif MAP_IMPLEMENTATION==MAP_POSIX || MAP_IMPLEMENTATION==MAP_390DLL
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typedef size_t MemoryMap;
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# define IS_MAP(map) ((map)!=0)
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# include <unistd.h>
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# include <sys/mman.h>
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# include <sys/stat.h>
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# include <fcntl.h>
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# ifndef MAP_FAILED
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# define MAP_FAILED ((void*)-1)
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# endif
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# if MAP_IMPLEMENTATION==MAP_390DLL
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/* No memory mapping for 390 batch mode. Fake it using dll loading. */
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# include <dll.h>
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# include "cstring.h"
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# include "cmemory.h"
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# include "unicode/udata.h"
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# define LIB_PREFIX "lib"
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# define LIB_SUFFIX ".dll"
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/* This is inconvienient until we figure out what to do with U_ICUDATA_NAME in utypes.h */
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# define U_ICUDATA_ENTRY_NAME "icudt" U_ICU_VERSION_SHORT U_LIB_SUFFIX_C_NAME_STRING "_dat"
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# endif
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#elif MAP_IMPLEMENTATION==MAP_STDIO
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# include <stdio.h>
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# include "cmemory.h"
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typedef void *MemoryMap;
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# define IS_MAP(map) ((map)!=NULL)
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#endif
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/*----------------------------------------------------------------------------*
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* *
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* Memory Mapped File support. Platform dependent implementation of *
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* functions used by the rest of the implementation.*
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* *
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*----------------------------------------------------------------------------*/
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#if MAP_IMPLEMENTATION==MAP_NONE
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U_CFUNC UBool
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uprv_mapFile(UDataMemory *pData, const char *path) {
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UDataMemory_init(pData); /* Clear the output struct. */
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return FALSE; /* no file access */
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}
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U_CFUNC void uprv_unmapFile(UDataMemory *pData) {
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/* nothing to do */
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}
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#elif MAP_IMPLEMENTATION==MAP_WIN32
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U_CFUNC UBool
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uprv_mapFile(
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UDataMemory *pData, /* Fill in with info on the result doing the mapping. */
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/* Output only; any original contents are cleared. */
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const char *path /* File path to be opened/mapped */
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)
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{
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HANDLE map;
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HANDLE file;
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SECURITY_ATTRIBUTES mappingAttributes;
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SECURITY_ATTRIBUTES *mappingAttributesPtr = NULL;
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SECURITY_DESCRIPTOR securityDesc;
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UDataMemory_init(pData); /* Clear the output struct. */
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/* open the input file */
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file=CreateFileA(path, GENERIC_READ, FILE_SHARE_READ, NULL,
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OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL|FILE_FLAG_RANDOM_ACCESS, NULL);
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if(file==INVALID_HANDLE_VALUE) {
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return FALSE;
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}
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/* Declare and initialize a security descriptor.
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This is required for multiuser systems on Windows 2000 SP4 and beyond */
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if (InitializeSecurityDescriptor(&securityDesc, SECURITY_DESCRIPTOR_REVISION)) {
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/* give the security descriptor a Null Dacl done using the "TRUE, (PACL)NULL" here */
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if (SetSecurityDescriptorDacl(&securityDesc, TRUE, (PACL)NULL, FALSE)) {
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/* Make the security attributes point to the security descriptor */
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uprv_memset(&mappingAttributes, 0, sizeof(mappingAttributes));
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mappingAttributes.nLength = sizeof(mappingAttributes);
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mappingAttributes.lpSecurityDescriptor = &securityDesc;
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mappingAttributes.bInheritHandle = FALSE; /* object uninheritable */
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mappingAttributesPtr = &mappingAttributes;
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}
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}
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/* else creating security descriptors can fail when we are on Windows 98,
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and mappingAttributesPtr == NULL for that case. */
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/* create an unnamed Windows file-mapping object for the specified file */
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map=CreateFileMapping(file, mappingAttributesPtr, PAGE_READONLY, 0, 0, NULL);
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CloseHandle(file);
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if(map==NULL) {
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return FALSE;
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}
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/* map a view of the file into our address space */
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pData->pHeader=(const DataHeader *)MapViewOfFile(map, FILE_MAP_READ, 0, 0, 0);
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if(pData->pHeader==NULL) {
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CloseHandle(map);
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return FALSE;
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}
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pData->map=map;
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return TRUE;
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}
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U_CFUNC void
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uprv_unmapFile(UDataMemory *pData) {
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if(pData!=NULL && pData->map!=NULL) {
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UnmapViewOfFile(pData->pHeader);
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CloseHandle(pData->map);
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pData->pHeader=NULL;
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pData->map=NULL;
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}
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}
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#elif MAP_IMPLEMENTATION==MAP_POSIX
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U_CFUNC UBool
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uprv_mapFile(UDataMemory *pData, const char *path) {
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int fd;
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int length;
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struct stat mystat;
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void *data;
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UDataMemory_init(pData); /* Clear the output struct. */
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/* determine the length of the file */
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if(stat(path, &mystat)!=0 || mystat.st_size<=0) {
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return FALSE;
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}
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length=mystat.st_size;
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/* open the file */
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fd=open(path, O_RDONLY);
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if(fd==-1) {
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return FALSE;
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}
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/* get a view of the mapping */
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#if U_PLATFORM != U_PF_HPUX
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data=mmap(0, length, PROT_READ, MAP_SHARED, fd, 0);
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#else
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data=mmap(0, length, PROT_READ, MAP_PRIVATE, fd, 0);
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#endif
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close(fd); /* no longer needed */
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if(data==MAP_FAILED) {
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return FALSE;
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}
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pData->map = (char *)data + length;
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pData->pHeader=(const DataHeader *)data;
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pData->mapAddr = data;
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#if U_PLATFORM == U_PF_IPHONE
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posix_madvise(data, length, POSIX_MADV_RANDOM);
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#endif
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return TRUE;
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}
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U_CFUNC void
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uprv_unmapFile(UDataMemory *pData) {
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if(pData!=NULL && pData->map!=NULL) {
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size_t dataLen = (char *)pData->map - (char *)pData->mapAddr;
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if(munmap(pData->mapAddr, dataLen)==-1) {
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}
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pData->pHeader=NULL;
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pData->map=0;
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pData->mapAddr=NULL;
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}
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}
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#elif MAP_IMPLEMENTATION==MAP_STDIO
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/* copy of the filestrm.c/T_FileStream_size() implementation */
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static int32_t
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umap_fsize(FILE *f) {
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int32_t savedPos = ftell(f);
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int32_t size = 0;
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/*Changes by Bertrand A. D. doesn't affect the current position
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goes to the end of the file before ftell*/
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fseek(f, 0, SEEK_END);
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size = (int32_t)ftell(f);
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fseek(f, savedPos, SEEK_SET);
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return size;
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}
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U_CFUNC UBool
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uprv_mapFile(UDataMemory *pData, const char *path) {
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FILE *file;
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int32_t fileLength;
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void *p;
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UDataMemory_init(pData); /* Clear the output struct. */
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/* open the input file */
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file=fopen(path, "rb");
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if(file==NULL) {
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return FALSE;
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}
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/* get the file length */
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fileLength=umap_fsize(file);
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if(ferror(file) || fileLength<=20) {
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fclose(file);
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return FALSE;
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}
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/* allocate the memory to hold the file data */
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p=uprv_malloc(fileLength);
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if(p==NULL) {
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fclose(file);
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return FALSE;
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}
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/* read the file */
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if(fileLength!=fread(p, 1, fileLength, file)) {
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uprv_free(p);
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fclose(file);
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return FALSE;
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}
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fclose(file);
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pData->map=p;
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pData->pHeader=(const DataHeader *)p;
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pData->mapAddr=p;
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return TRUE;
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}
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U_CFUNC void
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uprv_unmapFile(UDataMemory *pData) {
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if(pData!=NULL && pData->map!=NULL) {
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uprv_free(pData->map);
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pData->map = NULL;
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pData->mapAddr = NULL;
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pData->pHeader = NULL;
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}
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}
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#elif MAP_IMPLEMENTATION==MAP_390DLL
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/* 390 specific Library Loading.
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* This is the only platform left that dynamically loads an ICU Data Library.
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* All other platforms use .data files when dynamic loading is required, but
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* this turn out to be awkward to support in 390 batch mode.
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*
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* The idea here is to hide the fact that 390 is using dll loading from the
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* rest of ICU, and make it look like there is file loading happening.
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*
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*/
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static char *strcpy_returnEnd(char *dest, const char *src)
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{
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while((*dest=*src)!=0) {
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++dest;
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++src;
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}
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return dest;
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}
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/*------------------------------------------------------------------------------
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*
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* computeDirPath given a user-supplied path of an item to be opened,
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* compute and return
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* - the full directory path to be used
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* when opening the file.
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* - Pointer to null at end of above returned path
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*
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* Parameters:
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* path: input path. Buffer is not altered.
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* pathBuffer: Output buffer. Any contents are overwritten.
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*
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* Returns:
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* Pointer to null termination in returned pathBuffer.
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*
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* TODO: This works the way ICU historically has, but the
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* whole data fallback search path is so complicated that
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* proabably almost no one will ever really understand it,
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* the potential for confusion is large. (It's not just
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* this one function, but the whole scheme.)
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*
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*------------------------------------------------------------------------------*/
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static char *uprv_computeDirPath(const char *path, char *pathBuffer)
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{
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char *finalSlash; /* Ptr to last dir separator in input path, or null if none. */
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int32_t pathLen; /* Length of the returned directory path */
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finalSlash = 0;
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if (path != 0) {
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finalSlash = uprv_strrchr(path, U_FILE_SEP_CHAR);
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}
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*pathBuffer = 0;
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if (finalSlash == 0) {
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/* No user-supplied path.
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* Copy the ICU_DATA path to the path buffer and return that*/
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const char *icuDataDir;
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icuDataDir=u_getDataDirectory();
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if(icuDataDir!=NULL && *icuDataDir!=0) {
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return strcpy_returnEnd(pathBuffer, icuDataDir);
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} else {
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/* there is no icuDataDir either. Just return the empty pathBuffer. */
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return pathBuffer;
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}
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}
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/* User supplied path did contain a directory portion.
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* Copy it to the output path buffer */
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pathLen = (int32_t)(finalSlash - path + 1);
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uprv_memcpy(pathBuffer, path, pathLen);
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*(pathBuffer+pathLen) = 0;
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return pathBuffer+pathLen;
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}
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# define DATA_TYPE "dat"
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U_CFUNC UBool uprv_mapFile(UDataMemory *pData, const char *path) {
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const char *inBasename;
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char *basename;
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char pathBuffer[1024];
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const DataHeader *pHeader;
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dllhandle *handle;
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void *val=0;
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inBasename=uprv_strrchr(path, U_FILE_SEP_CHAR);
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if(inBasename==NULL) {
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inBasename = path;
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} else {
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inBasename++;
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}
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basename=uprv_computeDirPath(path, pathBuffer);
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if(uprv_strcmp(inBasename, U_ICUDATA_NAME".dat") != 0) {
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/* must mmap file... for build */
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int fd;
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int length;
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struct stat mystat;
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void *data;
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UDataMemory_init(pData); /* Clear the output struct. */
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/* determine the length of the file */
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if(stat(path, &mystat)!=0 || mystat.st_size<=0) {
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return FALSE;
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}
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length=mystat.st_size;
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/* open the file */
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fd=open(path, O_RDONLY);
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if(fd==-1) {
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return FALSE;
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}
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/* get a view of the mapping */
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data=mmap(0, length, PROT_READ, MAP_PRIVATE, fd, 0);
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close(fd); /* no longer needed */
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if(data==MAP_FAILED) {
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return FALSE;
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}
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pData->map = (char *)data + length;
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pData->pHeader=(const DataHeader *)data;
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pData->mapAddr = data;
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return TRUE;
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}
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# ifdef OS390BATCH
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/* ### hack: we still need to get u_getDataDirectory() fixed
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for OS/390 (batch mode - always return "//"? )
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and this here straightened out with LIB_PREFIX and LIB_SUFFIX (both empty?!)
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This is probably due to the strange file system on OS/390. It's more like
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a database with short entry names than a typical file system. */
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/* U_ICUDATA_NAME should always have the correct name */
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/* BUT FOR BATCH MODE IT IS AN EXCEPTION BECAUSE */
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/* THE FIRST THREE LETTERS ARE PREASSIGNED TO THE */
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/* PROJECT!!!!! */
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uprv_strcpy(pathBuffer, "IXMI" U_ICU_VERSION_SHORT "DA");
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# else
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/* set up the library name */
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uprv_strcpy(basename, LIB_PREFIX U_LIBICUDATA_NAME U_ICU_VERSION_SHORT LIB_SUFFIX);
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# endif
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# ifdef UDATA_DEBUG
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fprintf(stderr, "dllload: %s ", pathBuffer);
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# endif
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handle=dllload(pathBuffer);
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# ifdef UDATA_DEBUG
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fprintf(stderr, " -> %08X\n", handle );
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# endif
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if(handle != NULL) {
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/* we have a data DLL - what kind of lookup do we need here? */
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/* try to find the Table of Contents */
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UDataMemory_init(pData); /* Clear the output struct. */
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val=dllqueryvar((dllhandle*)handle, U_ICUDATA_ENTRY_NAME);
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if(val == 0) {
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/* failed... so keep looking */
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return FALSE;
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}
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# ifdef UDATA_DEBUG
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fprintf(stderr, "dllqueryvar(%08X, %s) -> %08X\n", handle, U_ICUDATA_ENTRY_NAME, val);
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# endif
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pData->pHeader=(const DataHeader *)val;
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return TRUE;
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} else {
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return FALSE; /* no handle */
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}
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}
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U_CFUNC void uprv_unmapFile(UDataMemory *pData) {
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if(pData!=NULL && pData->map!=NULL) {
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uprv_free(pData->map);
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pData->map = NULL;
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pData->mapAddr = NULL;
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pData->pHeader = NULL;
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}
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}
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#else
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# error MAP_IMPLEMENTATION is set incorrectly
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#endif
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