[apple/icu.git] / icuSources / common / umapfile.c

/*
******************************************************************************
*
*   Copyright (C) 1999-2006, 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.
 *
 *----------------------------------------------------------------------------*/
#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

/* ### Todo: properly auto detect mmap(). Until then, just add your platform here. */
#elif U_HAVE_MMAP || defined(U_AIX) || defined(U_HPUX) || defined(OS390)
    typedef size_t MemoryMap;

#   define IS_MAP(map) ((map)!=0)

    /* Needed by OSF to get the correct mmap version */
#   ifndef _XOPEN_SOURCE_EXTENDED
#       define _XOPEN_SOURCE_EXTENDED
#   endif

#   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=CreateFile(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
Commit	Line	Data
b75a7d8f A	1	/*
	2	******************************************************************************
	3	*
73c04bcf	4	* Copyright (C) 1999-2006, International Business Machines
b75a7d8f A	5	* Corporation and others. All Rights Reserved.
	6	*
	7	******************************************************************************/
	8
	9
	10	/*----------------------------------------------------------------------------
	11	*
	12	* Memory mapped file wrappers for use by the ICU Data Implementation
	13	* All of the platform-specific implementation for mapping data files
	14	* is here. The rest of the ICU Data implementation uses only the
	15	* wrapper functions.
	16	*
	17	----------------------------------------------------------------------------/
374ca955	18	#include "unicode/putil.h"
b75a7d8f A	19
	20
	21	#include "udatamem.h"
	22	#include "umapfile.h"
	23
b75a7d8f A	24	/* memory-mapping base definitions ------------------------------------------ */
b75a7d8f A	25
73c04bcf A	26	/* MAP_NONE: no memory mapping, no file access at all */
73c04bcf A	27	#define MAP_NONE 0
b75a7d8f A	28	#define MAP_WIN32 1
b75a7d8f A	29	#define MAP_POSIX 2
73c04bcf	30	#define MAP_STDIO 3
b75a7d8f A	31	#define MAP_390DLL 4
b75a7d8f A	32
73c04bcf A	33	#if UCONFIG_NO_FILE_IO
	34	# define MAP_IMPLEMENTATION MAP_NONE
	35	#elif defined(U_WINDOWS)
b75a7d8f	36	# define WIN32_LEAN_AND_MEAN
374ca955	37	# define VC_EXTRALEAN
b75a7d8f A	38	# define NOUSER
	39	# define NOSERVICE
	40	# define NOIME
	41	# define NOMCX
	42	# include <windows.h>
73c04bcf	43	# include "cmemory.h"
b75a7d8f A	44
	45	typedef HANDLE MemoryMap;
	46
	47	# define IS_MAP(map) ((map)!=NULL)
	48
	49	# define MAP_IMPLEMENTATION MAP_WIN32
	50
	51	/* ### Todo: properly auto detect mmap(). Until then, just add your platform here. */
73c04bcf	52	#elif U_HAVE_MMAP \|\| defined(U_AIX) \|\| defined(U_HPUX) \|\| defined(OS390)
b75a7d8f A	53	typedef size_t MemoryMap;
	54
	55	# define IS_MAP(map) ((map)!=0)
	56
	57	/* Needed by OSF to get the correct mmap version */
	58	# ifndef _XOPEN_SOURCE_EXTENDED
	59	# define _XOPEN_SOURCE_EXTENDED
	60	# endif
	61
	62	# include <unistd.h>
	63	# include <sys/mman.h>
	64	# include <sys/stat.h>
	65	# include <fcntl.h>
	66
	67	# ifndef MAP_FAILED
	68	# define MAP_FAILED ((void*)-1)
	69	# endif
	70
	71	# if defined(OS390) && defined (OS390_STUBDATA)
	72	/* No memory mapping for 390 batch mode. Fake it using dll loading. */
	73	# include <dll.h>
	74	# include "cstring.h"
	75	# include "cmemory.h"
	76	# include "unicode/udata.h"
	77	# define LIB_PREFIX "lib"
	78	# define LIB_SUFFIX ".dll"
	79	# define MAP_IMPLEMENTATION MAP_390DLL
	80
	81	/* This is inconvienient until we figure out what to do with U_ICUDATA_NAME in utypes.h */
	82	# define U_ICUDATA_ENTRY_NAME "icudt" U_ICU_VERSION_SHORT U_LIB_SUFFIX_C_NAME_STRING "_dat"
	83	# else
	84	# define MAP_IMPLEMENTATION MAP_POSIX
	85	# endif
	86
73c04bcf	87	#else /* unknown platform, no memory map implementation: use stdio.h and uprv_malloc() instead */
b75a7d8f	88
73c04bcf	89	# include <stdio.h>
b75a7d8f A	90	# include "cmemory.h"
	91
	92	typedef void *MemoryMap;
	93
	94	# define IS_MAP(map) ((map)!=NULL)
	95
73c04bcf	96	# define MAP_IMPLEMENTATION MAP_STDIO
b75a7d8f A	97
	98	#endif
	99
	100
	101
	102
	103	/----------------------------------------------------------------------------
	104	* *
	105	* Memory Mapped File support. Platform dependent implementation of *
	106	* functions used by the rest of the implementation.*
	107	* *
	108	----------------------------------------------------------------------------/
73c04bcf A	109	#if MAP_IMPLEMENTATION==MAP_NONE
	110	UBool
	111	uprv_mapFile(UDataMemory pData, const char path) {
	112	UDataMemory_init(pData); /* Clear the output struct. */
	113	return FALSE; /* no file access */
	114	}
	115
	116	void uprv_unmapFile(UDataMemory *pData) {
	117	/* nothing to do */
	118	}
	119	#elif MAP_IMPLEMENTATION==MAP_WIN32
b75a7d8f A	120	UBool
	121	uprv_mapFile(
	122	UDataMemory pData, / Fill in with info on the result doing the mapping. */
	123	/* Output only; any original contents are cleared. */
	124	const char path / File path to be opened/mapped */
	125	)
	126	{
	127	HANDLE map;
	128	HANDLE file;
73c04bcf A	129	SECURITY_ATTRIBUTES mappingAttributes;
	130	SECURITY_ATTRIBUTES *mappingAttributesPtr = NULL;
	131	SECURITY_DESCRIPTOR securityDesc;
b75a7d8f A	132
	133	UDataMemory_init(pData); /* Clear the output struct. */
	134
	135	/* open the input file */
	136	file=CreateFile(path, GENERIC_READ, FILE_SHARE_READ, NULL,
	137	OPEN_EXISTING,
	138	FILE_ATTRIBUTE_NORMAL\|FILE_FLAG_RANDOM_ACCESS, NULL);
	139	if(file==INVALID_HANDLE_VALUE) {
	140	return FALSE;
	141	}
	142
73c04bcf A	143	/* Declare and initialize a security descriptor.
	144	This is required for multiuser systems on Windows 2000 SP4 and beyond */
	145	if (InitializeSecurityDescriptor(&securityDesc, SECURITY_DESCRIPTOR_REVISION)) {
	146	/* give the security descriptor a Null Dacl done using the "TRUE, (PACL)NULL" here */
	147	if (SetSecurityDescriptorDacl(&securityDesc, TRUE, (PACL)NULL, FALSE)) {
	148	/* Make the security attributes point to the security descriptor */
	149	uprv_memset(&mappingAttributes, 0, sizeof(mappingAttributes));
	150	mappingAttributes.nLength = sizeof(mappingAttributes);
	151	mappingAttributes.lpSecurityDescriptor = &securityDesc;
	152	mappingAttributes.bInheritHandle = FALSE; /* object uninheritable */
	153	mappingAttributesPtr = &mappingAttributes;
	154	}
	155	}
	156	/* else creating security descriptors can fail when we are on Windows 98,
	157	and mappingAttributesPtr == NULL for that case. */
	158
b75a7d8f	159	/* create an unnamed Windows file-mapping object for the specified file */
73c04bcf	160	map=CreateFileMapping(file, mappingAttributesPtr, PAGE_READONLY, 0, 0, NULL);
b75a7d8f A	161	CloseHandle(file);
	162	if(map==NULL) {
	163	return FALSE;
	164	}
	165
	166	/* map a view of the file into our address space */
	167	pData->pHeader=(const DataHeader *)MapViewOfFile(map, FILE_MAP_READ, 0, 0, 0);
	168	if(pData->pHeader==NULL) {
	169	CloseHandle(map);
	170	return FALSE;
	171	}
	172	pData->map=map;
	173	return TRUE;
	174	}
	175
	176
	177	void
	178	uprv_unmapFile(UDataMemory *pData) {
	179	if(pData!=NULL && pData->map!=NULL) {
	180	UnmapViewOfFile(pData->pHeader);
	181	CloseHandle(pData->map);
	182	pData->pHeader=NULL;
	183	pData->map=NULL;
	184	}
	185	}
	186
	187
	188
	189	#elif MAP_IMPLEMENTATION==MAP_POSIX
	190	UBool
	191	uprv_mapFile(UDataMemory pData, const char path) {
	192	int fd;
	193	int length;
	194	struct stat mystat;
	195	void *data;
	196
	197	UDataMemory_init(pData); /* Clear the output struct. */
	198
	199	/* determine the length of the file */
	200	if(stat(path, &mystat)!=0 \|\| mystat.st_size<=0) {
	201	return FALSE;
	202	}
	203	length=mystat.st_size;
	204
	205	/* open the file */
	206	fd=open(path, O_RDONLY);
	207	if(fd==-1) {
	208	return FALSE;
	209	}
	210
	211	/* get a view of the mapping */
374ca955	212	#ifndef U_HPUX
b75a7d8f A	213	data=mmap(0, length, PROT_READ, MAP_SHARED, fd, 0);
	214	#else
	215	data=mmap(0, length, PROT_READ, MAP_PRIVATE, fd, 0);
	216	#endif
	217	close(fd); /* no longer needed */
	218	if(data==MAP_FAILED) {
	219	return FALSE;
	220	}
	221
	222	pData->map = (char *)data + length;
	223	pData->pHeader=(const DataHeader *)data;
	224	pData->mapAddr = data;
	225	return TRUE;
	226	}
	227
	228
	229
	230	void
	231	uprv_unmapFile(UDataMemory *pData) {
	232	if(pData!=NULL && pData->map!=NULL) {
	233	size_t dataLen = (char )pData->map - (char )pData->mapAddr;
	234	if(munmap(pData->mapAddr, dataLen)==-1) {
	235	}
	236	pData->pHeader=NULL;
	237	pData->map=0;
	238	pData->mapAddr=NULL;
	239	}
	240	}
	241
	242
	243
73c04bcf A	244	#elif MAP_IMPLEMENTATION==MAP_STDIO
	245	/* copy of the filestrm.c/T_FileStream_size() implementation */
	246	static int32_t
	247	umap_fsize(FILE *f) {
	248	int32_t savedPos = ftell(f);
	249	int32_t size = 0;
	250
	251	/*Changes by Bertrand A. D. doesn't affect the current position
	252	goes to the end of the file before ftell*/
	253	fseek(f, 0, SEEK_END);
	254	size = (int32_t)ftell(f);
	255	fseek(f, savedPos, SEEK_SET);
	256	return size;
	257	}
	258
b75a7d8f A	259	UBool
b75a7d8f A	260	uprv_mapFile(UDataMemory pData, const char path) {
73c04bcf	261	FILE *file;
b75a7d8f A	262	int32_t fileLength;
	263	void *p;
	264
	265	UDataMemory_init(pData); /* Clear the output struct. */
	266	/* open the input file */
73c04bcf	267	file=fopen(path, "rb");
b75a7d8f A	268	if(file==NULL) {
	269	return FALSE;
	270	}
	271
	272	/* get the file length */
73c04bcf A	273	fileLength=umap_fsize(file);
	274	if(ferror(file) \|\| fileLength<=20) {
	275	fclose(file);
b75a7d8f A	276	return FALSE;
	277	}
	278
	279	/* allocate the memory to hold the file data */
	280	p=uprv_malloc(fileLength);
	281	if(p==NULL) {
73c04bcf	282	fclose(file);
b75a7d8f A	283	return FALSE;
	284	}
	285
	286	/* read the file */
73c04bcf	287	if(fileLength!=fread(p, 1, fileLength, file)) {
b75a7d8f	288	uprv_free(p);
73c04bcf	289	fclose(file);
b75a7d8f A	290	return FALSE;
	291	}
	292
73c04bcf	293	fclose(file);
b75a7d8f A	294	pData->map=p;
	295	pData->pHeader=(const DataHeader *)p;
	296	pData->mapAddr=p;
	297	return TRUE;
	298	}
	299
	300	void
	301	uprv_unmapFile(UDataMemory *pData) {
	302	if(pData!=NULL && pData->map!=NULL) {
	303	uprv_free(pData->map);
	304	pData->map = NULL;
	305	pData->mapAddr = NULL;
	306	pData->pHeader = NULL;
	307	}
	308	}
	309
	310
	311	#elif MAP_IMPLEMENTATION==MAP_390DLL
	312	/* 390 specific Library Loading.
	313	* This is the only platform left that dynamically loads an ICU Data Library.
	314	* All other platforms use .data files when dynamic loading is required, but
	315	* this turn out to be awkward to support in 390 batch mode.
	316	*
	317	* The idea here is to hide the fact that 390 is using dll loading from the
	318	* rest of ICU, and make it look like there is file loading happening.
	319	*
	320	*/
	321
	322	static char strcpy_returnEnd(char dest, const char *src)
	323	{
	324	while((dest=src)!=0) {
	325	++dest;
	326	++src;
	327	}
	328	return dest;
	329	}
	330
	331	/*------------------------------------------------------------------------------
	332	*
	333	* computeDirPath given a user-supplied path of an item to be opened,
	334	* compute and return
	335	* - the full directory path to be used
	336	* when opening the file.
	337	* - Pointer to null at end of above returned path
	338	*
	339	* Parameters:
	340	* path: input path. Buffer is not altered.
	341	* pathBuffer: Output buffer. Any contents are overwritten.
	342	*
	343	* Returns:
	344	* Pointer to null termination in returned pathBuffer.
	345	*
	346	* TODO: This works the way ICU historically has, but the
	347	* whole data fallback search path is so complicated that
	348	* proabably almost no one will ever really understand it,
	349	* the potential for confusion is large. (It's not just
	350	* this one function, but the whole scheme.)
	351	*
	352	------------------------------------------------------------------------------/
	353	static char uprv_computeDirPath(const char path, char *pathBuffer)
	354	{
	355	char finalSlash; / Ptr to last dir separator in input path, or null if none. */
	356	int32_t pathLen; /* Length of the returned directory path */
	357
358	finalSlash = 0;
359	if (path != 0) {
360	finalSlash = uprv_strrchr(path, U_FILE_SEP_CHAR);
361	}
362
363	*pathBuffer = 0;
364	if (finalSlash == 0) {
365	/* No user-supplied path.
366	* Copy the ICU_DATA path to the path buffer and return that*/
367	const char *icuDataDir;
368	icuDataDir=u_getDataDirectory();
369	if(icuDataDir!=NULL && *icuDataDir!=0) {
370	return strcpy_returnEnd(pathBuffer, icuDataDir);
371	} else {
372	/* there is no icuDataDir either. Just return the empty pathBuffer. */
373	return pathBuffer;
374	}
375	}
376
377	/* User supplied path did contain a directory portion.
378	* Copy it to the output path buffer */
379	pathLen = (int32_t)(finalSlash - path + 1);
380	uprv_memcpy(pathBuffer, path, pathLen);
381	*(pathBuffer+pathLen) = 0;
382	return pathBuffer+pathLen;
383	}
384
385
386	# define DATA_TYPE "dat"
387
388	UBool uprv_mapFile(UDataMemory pData, const char path) {
389	const char *inBasename;
390	char *basename;
391	char pathBuffer[1024];
392	const DataHeader *pHeader;
393	dllhandle *handle;
394	void *val=0;
395
396	inBasename=uprv_strrchr(path, U_FILE_SEP_CHAR);
397	if(inBasename==NULL) {
398	inBasename = path;
399	} else {
400	inBasename++;
401	}
402	basename=uprv_computeDirPath(path, pathBuffer);
403	if(uprv_strcmp(inBasename, U_ICUDATA_NAME".dat") != 0) {
404	/* must mmap file... for build */
405	int fd;
406	int length;
407	struct stat mystat;
408	void *data;
409	UDataMemory_init(pData); /* Clear the output struct. */
410
411	/* determine the length of the file */
412	if(stat(path, &mystat)!=0 \|\| mystat.st_size<=0) {
413	return FALSE;
414	}
415	length=mystat.st_size;
416
417	/* open the file */
418	fd=open(path, O_RDONLY);
419	if(fd==-1) {
420	return FALSE;
421	}
422
423	/* get a view of the mapping */
424	data=mmap(0, length, PROT_READ, MAP_PRIVATE, fd, 0);
425	close(fd); /* no longer needed */
426	if(data==MAP_FAILED) {
427	return FALSE;
428	}
429	pData->map = (char *)data + length;
430	pData->pHeader=(const DataHeader *)data;
431	pData->mapAddr = data;
432	return TRUE;
433	}
434
435	# ifdef OS390BATCH
436	/* ### hack: we still need to get u_getDataDirectory() fixed
437	for OS/390 (batch mode - always return "//"? )
438	and this here straightened out with LIB_PREFIX and LIB_SUFFIX (both empty?!)
439	This is probably due to the strange file system on OS/390. It's more like
440	a database with short entry names than a typical file system. */
441	/* U_ICUDATA_NAME should always have the correct name */
442	/* BUT FOR BATCH MODE IT IS AN EXCEPTION BECAUSE */
443	/* THE FIRST THREE LETTERS ARE PREASSIGNED TO THE */
444	/* PROJECT!!!!! */
445	uprv_strcpy(pathBuffer, "IXMI" U_ICU_VERSION_SHORT "DA");
446	# else
447	/* set up the library name */
448	uprv_strcpy(basename, LIB_PREFIX U_LIBICUDATA_NAME U_ICU_VERSION_SHORT LIB_SUFFIX);
449	# endif
450
451	# ifdef UDATA_DEBUG
452	fprintf(stderr, "dllload: %s ", pathBuffer);
453	# endif
454
455	handle=dllload(pathBuffer);
456
457	# ifdef UDATA_DEBUG
458	fprintf(stderr, " -> %08X\n", handle );
459	# endif
460
461	if(handle != NULL) {
462	/* we have a data DLL - what kind of lookup do we need here? */
463	/* try to find the Table of Contents */
464	UDataMemory_init(pData); /* Clear the output struct. */
465	val=dllqueryvar((dllhandle*)handle, U_ICUDATA_ENTRY_NAME);
466	if(val == 0) {
467	/* failed... so keep looking */
468	return FALSE;
469	}
470	# ifdef UDATA_DEBUG
471	fprintf(stderr, "dllqueryvar(%08X, %s) -> %08X\n", handle, U_ICUDATA_ENTRY_NAME, val);
472	# endif
473
474	pData->pHeader=(const DataHeader *)val;
475	return TRUE;
476	} else {
477	return FALSE; /* no handle */
478	}
479	}
480
481
482
483	void uprv_unmapFile(UDataMemory *pData) {
484	if(pData!=NULL && pData->map!=NULL) {
485	uprv_free(pData->map);
486	pData->map = NULL;
487	pData->mapAddr = NULL;
488	pData->pHeader = NULL;
489	}
490	}
491
492	#else
493	# error MAP_IMPLEMENTATION is set incorrectly
494	#endif