The Tor Browser: intl/icu/source/common/umapfile.c@129ffea94266 (annotated)

intl/icu/source/common/umapfile.c@129ffea94266 (annotated)

intl/icu/source/common/umapfile.c

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
 ******************************************************************************
 *
 *   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

The Tor Browser / annotate

intl/icu/source/common/umapfile.c@129ffea94266 (annotated)

intl/icu/source/common/umapfile.c