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scuffed-code/icu4c/source/common/umapfile.c
George Rhoten 0f8b61b7fc ICU-5576 Fixes for z/OS 
X-SVN-Rev: 21208
2007-03-09 07:08:05 +00:00

495 lines
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C
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/*
******************************************************************************
*
* Copyright (C) 1999-2007, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************/
/*----------------------------------------------------------------------------
*
* Memory mapped file wrappers for use by the ICU Data Implementation
* All of the platform-specific implementation for mapping data files
* is here. The rest of the ICU Data implementation uses only the
* wrapper functions.
*
*----------------------------------------------------------------------------*/
/* Needed by OSF and z/OS to get the correct mmap version */
#if !defined(_XOPEN_SOURCE_EXTENDED)
#define _XOPEN_SOURCE_EXTENDED 1
#endif
#include "unicode/putil.h"
#include "udatamem.h"
#include "umapfile.h"
/* memory-mapping base definitions ------------------------------------------ */
/* MAP_NONE: no memory mapping, no file access at all */
#define MAP_NONE 0
#define MAP_WIN32 1
#define MAP_POSIX 2
#define MAP_STDIO 3
#define MAP_390DLL 4
#if UCONFIG_NO_FILE_IO
# define MAP_IMPLEMENTATION MAP_NONE
#elif defined(U_WINDOWS)
# define WIN32_LEAN_AND_MEAN
# define VC_EXTRALEAN
# define NOUSER
# define NOSERVICE
# define NOIME
# define NOMCX
# include <windows.h>
# include "cmemory.h"
typedef HANDLE MemoryMap;
# define IS_MAP(map) ((map)!=NULL)
# define MAP_IMPLEMENTATION MAP_WIN32
#elif U_HAVE_MMAP || defined(OS390)
typedef size_t MemoryMap;
# define IS_MAP(map) ((map)!=0)
# include <unistd.h>
# include <sys/mman.h>
# include <sys/stat.h>
# include <fcntl.h>
# ifndef MAP_FAILED
# define MAP_FAILED ((void*)-1)
# endif
# if defined(OS390) && defined (OS390_STUBDATA)
/* No memory mapping for 390 batch mode. Fake it using dll loading. */
# include <dll.h>
# include "cstring.h"
# include "cmemory.h"
# include "unicode/udata.h"
# define LIB_PREFIX "lib"
# define LIB_SUFFIX ".dll"
# define MAP_IMPLEMENTATION MAP_390DLL
/* This is inconvienient until we figure out what to do with U_ICUDATA_NAME in utypes.h */
# define U_ICUDATA_ENTRY_NAME "icudt" U_ICU_VERSION_SHORT U_LIB_SUFFIX_C_NAME_STRING "_dat"
# else
# define MAP_IMPLEMENTATION MAP_POSIX
# endif
#else /* unknown platform, no memory map implementation: use stdio.h and uprv_malloc() instead */
# include <stdio.h>
# include "cmemory.h"
typedef void *MemoryMap;
# define IS_MAP(map) ((map)!=NULL)
# define MAP_IMPLEMENTATION MAP_STDIO
#endif
/*----------------------------------------------------------------------------*
* *
* Memory Mapped File support. Platform dependent implementation of *
* functions used by the rest of the implementation.*
* *
*----------------------------------------------------------------------------*/
#if MAP_IMPLEMENTATION==MAP_NONE
UBool
uprv_mapFile(UDataMemory *pData, const char *path) {
UDataMemory_init(pData); /* Clear the output struct. */
return FALSE; /* no file access */
}
void uprv_unmapFile(UDataMemory *pData) {
/* nothing to do */
}
#elif MAP_IMPLEMENTATION==MAP_WIN32
UBool
uprv_mapFile(
UDataMemory *pData, /* Fill in with info on the result doing the mapping. */
/* Output only; any original contents are cleared. */
const char *path /* File path to be opened/mapped */
)
{
HANDLE map;
HANDLE file;
SECURITY_ATTRIBUTES mappingAttributes;
SECURITY_ATTRIBUTES *mappingAttributesPtr = NULL;
SECURITY_DESCRIPTOR securityDesc;
UDataMemory_init(pData); /* Clear the output struct. */
/* open the input file */
file=CreateFileA(path, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL|FILE_FLAG_RANDOM_ACCESS, NULL);
if(file==INVALID_HANDLE_VALUE) {
return FALSE;
}
/* Declare and initialize a security descriptor.
This is required for multiuser systems on Windows 2000 SP4 and beyond */
if (InitializeSecurityDescriptor(&securityDesc, SECURITY_DESCRIPTOR_REVISION)) {
/* give the security descriptor a Null Dacl done using the "TRUE, (PACL)NULL" here */
if (SetSecurityDescriptorDacl(&securityDesc, TRUE, (PACL)NULL, FALSE)) {
/* Make the security attributes point to the security descriptor */
uprv_memset(&mappingAttributes, 0, sizeof(mappingAttributes));
mappingAttributes.nLength = sizeof(mappingAttributes);
mappingAttributes.lpSecurityDescriptor = &securityDesc;
mappingAttributes.bInheritHandle = FALSE; /* object uninheritable */
mappingAttributesPtr = &mappingAttributes;
}
}
/* else creating security descriptors can fail when we are on Windows 98,
and mappingAttributesPtr == NULL for that case. */
/* create an unnamed Windows file-mapping object for the specified file */
map=CreateFileMapping(file, mappingAttributesPtr, PAGE_READONLY, 0, 0, NULL);
CloseHandle(file);
if(map==NULL) {
return FALSE;
}
/* map a view of the file into our address space */
pData->pHeader=(const DataHeader *)MapViewOfFile(map, FILE_MAP_READ, 0, 0, 0);
if(pData->pHeader==NULL) {
CloseHandle(map);
return FALSE;
}
pData->map=map;
return TRUE;
}
void
uprv_unmapFile(UDataMemory *pData) {
if(pData!=NULL && pData->map!=NULL) {
UnmapViewOfFile(pData->pHeader);
CloseHandle(pData->map);
pData->pHeader=NULL;
pData->map=NULL;
}
}
#elif MAP_IMPLEMENTATION==MAP_POSIX
UBool
uprv_mapFile(UDataMemory *pData, const char *path) {
int fd;
int length;
struct stat mystat;
void *data;
UDataMemory_init(pData); /* Clear the output struct. */
/* determine the length of the file */
if(stat(path, &mystat)!=0 || mystat.st_size<=0) {
return FALSE;
}
length=mystat.st_size;
/* open the file */
fd=open(path, O_RDONLY);
if(fd==-1) {
return FALSE;
}
/* get a view of the mapping */
#ifndef U_HPUX
data=mmap(0, length, PROT_READ, MAP_SHARED, fd, 0);
#else
data=mmap(0, length, PROT_READ, MAP_PRIVATE, fd, 0);
#endif
close(fd); /* no longer needed */
if(data==MAP_FAILED) {
return FALSE;
}
pData->map = (char *)data + length;
pData->pHeader=(const DataHeader *)data;
pData->mapAddr = data;
return TRUE;
}
void
uprv_unmapFile(UDataMemory *pData) {
if(pData!=NULL && pData->map!=NULL) {
size_t dataLen = (char *)pData->map - (char *)pData->mapAddr;
if(munmap(pData->mapAddr, dataLen)==-1) {
}
pData->pHeader=NULL;
pData->map=0;
pData->mapAddr=NULL;
}
}
#elif MAP_IMPLEMENTATION==MAP_STDIO
/* copy of the filestrm.c/T_FileStream_size() implementation */
static int32_t
umap_fsize(FILE *f) {
int32_t savedPos = ftell(f);
int32_t size = 0;
/*Changes by Bertrand A. D. doesn't affect the current position
goes to the end of the file before ftell*/
fseek(f, 0, SEEK_END);
size = (int32_t)ftell(f);
fseek(f, savedPos, SEEK_SET);
return size;
}
UBool
uprv_mapFile(UDataMemory *pData, const char *path) {
FILE *file;
int32_t fileLength;
void *p;
UDataMemory_init(pData); /* Clear the output struct. */
/* open the input file */
file=fopen(path, "rb");
if(file==NULL) {
return FALSE;
}
/* get the file length */
fileLength=umap_fsize(file);
if(ferror(file) || fileLength<=20) {
fclose(file);
return FALSE;
}
/* allocate the memory to hold the file data */
p=uprv_malloc(fileLength);
if(p==NULL) {
fclose(file);
return FALSE;
}
/* read the file */
if(fileLength!=fread(p, 1, fileLength, file)) {
uprv_free(p);
fclose(file);
return FALSE;
}
fclose(file);
pData->map=p;
pData->pHeader=(const DataHeader *)p;
pData->mapAddr=p;
return TRUE;
}
void
uprv_unmapFile(UDataMemory *pData) {
if(pData!=NULL && pData->map!=NULL) {
uprv_free(pData->map);
pData->map = NULL;
pData->mapAddr = NULL;
pData->pHeader = NULL;
}
}
#elif MAP_IMPLEMENTATION==MAP_390DLL
/* 390 specific Library Loading.
* This is the only platform left that dynamically loads an ICU Data Library.
* All other platforms use .data files when dynamic loading is required, but
* this turn out to be awkward to support in 390 batch mode.
*
* The idea here is to hide the fact that 390 is using dll loading from the
* rest of ICU, and make it look like there is file loading happening.
*
*/
static char *strcpy_returnEnd(char *dest, const char *src)
{
while((*dest=*src)!=0) {
++dest;
++src;
}
return dest;
}
/*------------------------------------------------------------------------------
*
* computeDirPath given a user-supplied path of an item to be opened,
* compute and return
* - the full directory path to be used
* when opening the file.
* - Pointer to null at end of above returned path
*
* Parameters:
* path: input path. Buffer is not altered.
* pathBuffer: Output buffer. Any contents are overwritten.
*
* Returns:
* Pointer to null termination in returned pathBuffer.
*
* TODO: This works the way ICU historically has, but the
* whole data fallback search path is so complicated that
* proabably almost no one will ever really understand it,
* the potential for confusion is large. (It's not just
* this one function, but the whole scheme.)
*
*------------------------------------------------------------------------------*/
static char *uprv_computeDirPath(const char *path, char *pathBuffer)
{
char *finalSlash; /* Ptr to last dir separator in input path, or null if none. */
int32_t pathLen; /* Length of the returned directory path */
finalSlash = 0;
if (path != 0) {
finalSlash = uprv_strrchr(path, U_FILE_SEP_CHAR);
}
*pathBuffer = 0;
if (finalSlash == 0) {
/* No user-supplied path.
* Copy the ICU_DATA path to the path buffer and return that*/
const char *icuDataDir;
icuDataDir=u_getDataDirectory();
if(icuDataDir!=NULL && *icuDataDir!=0) {
return strcpy_returnEnd(pathBuffer, icuDataDir);
} else {
/* there is no icuDataDir either. Just return the empty pathBuffer. */
return pathBuffer;
}
}
/* User supplied path did contain a directory portion.
* Copy it to the output path buffer */
pathLen = (int32_t)(finalSlash - path + 1);
uprv_memcpy(pathBuffer, path, pathLen);
*(pathBuffer+pathLen) = 0;
return pathBuffer+pathLen;
}
# define DATA_TYPE "dat"
UBool uprv_mapFile(UDataMemory *pData, const char *path) {
const char *inBasename;
char *basename;
char pathBuffer[1024];
const DataHeader *pHeader;
dllhandle *handle;
void *val=0;
inBasename=uprv_strrchr(path, U_FILE_SEP_CHAR);
if(inBasename==NULL) {
inBasename = path;
} else {
inBasename++;
}
basename=uprv_computeDirPath(path, pathBuffer);
if(uprv_strcmp(inBasename, U_ICUDATA_NAME".dat") != 0) {
/* must mmap file... for build */
int fd;
int length;
struct stat mystat;
void *data;
UDataMemory_init(pData); /* Clear the output struct. */
/* determine the length of the file */
if(stat(path, &mystat)!=0 || mystat.st_size<=0) {
return FALSE;
}
length=mystat.st_size;
/* open the file */
fd=open(path, O_RDONLY);
if(fd==-1) {
return FALSE;
}
/* get a view of the mapping */
data=mmap(0, length, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd); /* no longer needed */
if(data==MAP_FAILED) {
return FALSE;
}
pData->map = (char *)data + length;
pData->pHeader=(const DataHeader *)data;
pData->mapAddr = data;
return TRUE;
}
# ifdef OS390BATCH
/* ### hack: we still need to get u_getDataDirectory() fixed
for OS/390 (batch mode - always return "//"? )
and this here straightened out with LIB_PREFIX and LIB_SUFFIX (both empty?!)
This is probably due to the strange file system on OS/390. It's more like
a database with short entry names than a typical file system. */
/* U_ICUDATA_NAME should always have the correct name */
/* BUT FOR BATCH MODE IT IS AN EXCEPTION BECAUSE */
/* THE FIRST THREE LETTERS ARE PREASSIGNED TO THE */
/* PROJECT!!!!! */
uprv_strcpy(pathBuffer, "IXMI" U_ICU_VERSION_SHORT "DA");
# else
/* set up the library name */
uprv_strcpy(basename, LIB_PREFIX U_LIBICUDATA_NAME U_ICU_VERSION_SHORT LIB_SUFFIX);
# endif
# ifdef UDATA_DEBUG
fprintf(stderr, "dllload: %s ", pathBuffer);
# endif
handle=dllload(pathBuffer);
# ifdef UDATA_DEBUG
fprintf(stderr, " -> %08X\n", handle );
# endif
if(handle != NULL) {
/* we have a data DLL - what kind of lookup do we need here? */
/* try to find the Table of Contents */
UDataMemory_init(pData); /* Clear the output struct. */
val=dllqueryvar((dllhandle*)handle, U_ICUDATA_ENTRY_NAME);
if(val == 0) {
/* failed... so keep looking */
return FALSE;
}
# ifdef UDATA_DEBUG
fprintf(stderr, "dllqueryvar(%08X, %s) -> %08X\n", handle, U_ICUDATA_ENTRY_NAME, val);
# endif
pData->pHeader=(const DataHeader *)val;
return TRUE;
} else {
return FALSE; /* no handle */
}
}
void uprv_unmapFile(UDataMemory *pData) {
if(pData!=NULL && pData->map!=NULL) {
uprv_free(pData->map);
pData->map = NULL;
pData->mapAddr = NULL;
pData->pHeader = NULL;
}
}
#else
# error MAP_IMPLEMENTATION is set incorrectly
#endif
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