diff options
Diffstat (limited to 'deps/icu-small/source/common/umapfile.c')
| -rw-r--r-- | deps/icu-small/source/common/umapfile.c | 464 |
1 files changed, 464 insertions, 0 deletions
diff --git a/deps/icu-small/source/common/umapfile.c b/deps/icu-small/source/common/umapfile.c new file mode 100644 index 0000000000..0167588929 --- /dev/null +++ b/deps/icu-small/source/common/umapfile.c @@ -0,0 +1,464 @@ +/* +****************************************************************************** +* +* Copyright (C) 1999-2013, 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. + * + *----------------------------------------------------------------------------*/ +/* Defines _XOPEN_SOURCE for access to POSIX functions. + * Must be before any other #includes. */ +#include "uposixdefs.h" + +#include "unicode/putil.h" +#include "udatamem.h" +#include "umapfile.h" + +/* memory-mapping base definitions ------------------------------------------ */ + +#if MAP_IMPLEMENTATION==MAP_WIN32 +# 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) +#elif MAP_IMPLEMENTATION==MAP_POSIX || MAP_IMPLEMENTATION==MAP_390DLL + 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 MAP_IMPLEMENTATION==MAP_390DLL + /* 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" + /* 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" +# endif +#elif MAP_IMPLEMENTATION==MAP_STDIO +# include <stdio.h> +# include "cmemory.h" + + typedef void *MemoryMap; + +# define IS_MAP(map) ((map)!=NULL) +#endif + +/*----------------------------------------------------------------------------* + * * + * Memory Mapped File support. Platform dependent implementation of * + * functions used by the rest of the implementation.* + * * + *----------------------------------------------------------------------------*/ +#if MAP_IMPLEMENTATION==MAP_NONE + U_CFUNC UBool + uprv_mapFile(UDataMemory *pData, const char *path) { + UDataMemory_init(pData); /* Clear the output struct. */ + return FALSE; /* no file access */ + } + + U_CFUNC void uprv_unmapFile(UDataMemory *pData) { + /* nothing to do */ + } +#elif MAP_IMPLEMENTATION==MAP_WIN32 + U_CFUNC 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; + } + + U_CFUNC 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 + U_CFUNC 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 */ +#if U_PLATFORM != U_PF_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; +#if U_PLATFORM == U_PF_IPHONE + posix_madvise(data, length, POSIX_MADV_RANDOM); +#endif + return TRUE; + } + + U_CFUNC 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; + } + + U_CFUNC 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; + } + + U_CFUNC 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" + + U_CFUNC 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 */ + } + } + + U_CFUNC 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 |