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imagemagick/magick/utility.c

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Import Upstream version 6.9.11.60
2023-02-03 21:16:55 +08:00
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U U TTTTT IIIII L IIIII TTTTT Y Y %
% U U T I L I T Y Y %
% U U T I L I T Y %
% U U T I L I T Y %
% UUU T IIIII LLLLL IIIII T Y %
% %
% %
% MagickCore Utility Methods %
% %
% Software Design %
% Cristy %
% January 1993 %
% %
% %
% Copyright 1999-2021 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
% %
% You may not use this file except in compliance with the License. You may %
% obtain a copy of the License at %
% %
% https://imagemagick.org/script/license.php %
% %
% Unless required by applicable law or agreed to in writing, software %
% distributed under the License is distributed on an "AS IS" BASIS, %
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
% See the License for the specific language governing permissions and %
% limitations under the License. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/property.h"
#include "magick/blob.h"
#include "magick/color.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/geometry.h"
#include "magick/image-private.h"
#include "magick/list.h"
#include "magick/log.h"
#include "magick/memory_.h"
#include "magick/nt-base-private.h"
#include "magick/option.h"
#include "magick/policy.h"
#include "magick/random_.h"
#include "magick/registry.h"
#include "magick/resource_.h"
#include "magick/semaphore.h"
#include "magick/signature-private.h"
#include "magick/statistic.h"
#include "magick/string_.h"
#include "magick/string-private.h"
#include "magick/token.h"
#include "magick/utility.h"
#include "magick/utility-private.h"
#if defined(MAGICKCORE_HAVE_PROCESS_H)
#include <process.h>
#endif
#if defined(MAGICKCORE_HAVE_MACH_O_DYLD_H)
#include <mach-o/dyld.h>
#endif
/*
Static declarations.
*/
static const char
Base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/*
Forward declaration.
*/
static int
IsPathDirectory(const char *);
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% A c q u i r e U n i q u e F i l e n a m e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% AcquireUniqueFilename() replaces the contents of path by a unique path name.
%
% The format of the AcquireUniqueFilename method is:
%
% MagickBooleanType AcquireUniqueFilename(char *path)
%
% A description of each parameter follows.
%
% o path: Specifies a pointer to an array of characters. The unique path
% name is returned in this array.
%
*/
MagickExport MagickBooleanType AcquireUniqueFilename(char *path)
{
int
file;
file=AcquireUniqueFileResource(path);
if (file == -1)
return(MagickFalse);
file=close(file)-1;
return(MagickTrue);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% A c q u i r e U n i q u e S ym b o l i c L i n k %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% AcquireUniqueSymbolicLink() creates a unique symbolic link to the specified
% source path and returns MagickTrue on success otherwise MagickFalse. If the
% symlink() method fails or is not available, a unique file name is generated
% and the source file copied to it. When you are finished with the file, use
% RelinquishUniqueFilename() to destroy it.
%
% The format of the AcquireUniqueSymbolicLink method is:
%
% MagickBooleanType AcquireUniqueSymbolicLink(const char *source,
% char destination)
%
% A description of each parameter follows.
%
% o source: the source path.
%
% o destination: the destination path.
%
*/
MagickExport MagickBooleanType AcquireUniqueSymbolicLink(const char *source,
char *destination)
{
int
destination_file,
source_file;
MagickBooleanType
status;
size_t
length,
quantum;
ssize_t
count;
struct stat
attributes;
unsigned char
*buffer;
assert(source != (const char *) NULL);
assert(destination != (char *) NULL);
#if defined(MAGICKCORE_HAVE_SYMLINK)
{
char
*passes;
(void) AcquireUniqueFilename(destination);
(void) RelinquishUniqueFileResource(destination);
passes=GetPolicyValue("system:shred");
if (passes != (char *) NULL)
passes=DestroyString(passes);
else
{
if (*source == *DirectorySeparator)
{
if (symlink(source,destination) == 0)
return(MagickTrue);
}
else
{
char
path[MaxTextExtent];
*path='\0';
if (getcwd(path,MaxTextExtent) == (char *) NULL)
return(MagickFalse);
(void) ConcatenateMagickString(path,DirectorySeparator,
MaxTextExtent);
(void) ConcatenateMagickString(path,source,MaxTextExtent);
if (symlink(path,destination) == 0)
return(MagickTrue);
}
}
}
#endif
destination_file=AcquireUniqueFileResource(destination);
if (destination_file == -1)
return(MagickFalse);
source_file=open_utf8(source,O_RDONLY | O_BINARY,0);
if (source_file == -1)
{
(void) close(destination_file);
(void) RelinquishUniqueFileResource(destination);
return(MagickFalse);
}
quantum=(size_t) MagickMaxBufferExtent;
if ((fstat(source_file,&attributes) == 0) && (attributes.st_size > 0))
quantum=(size_t) MagickMin(attributes.st_size,MagickMaxBufferExtent);
buffer=(unsigned char *) AcquireQuantumMemory(quantum,sizeof(*buffer));
if (buffer == (unsigned char *) NULL)
{
(void) close(source_file);
(void) close(destination_file);
(void) RelinquishUniqueFileResource(destination);
return(MagickFalse);
}
status=MagickTrue;
for (length=0; ; )
{
count=(ssize_t) read(source_file,buffer,quantum);
if (count <= 0)
break;
length=(size_t) count;
count=(ssize_t) write(destination_file,buffer,length);
if ((size_t) count != length)
{
(void) RelinquishUniqueFileResource(destination);
status=MagickFalse;
break;
}
}
(void) close(destination_file);
(void) close(source_file);
buffer=(unsigned char *) RelinquishMagickMemory(buffer);
return(status);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% A p p e n d I m a g e F o r m a t %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% AppendImageFormat() appends the image format type to the filename. If an
% extension to the file already exists, it is first removed.
%
% The format of the AppendImageFormat method is:
%
% void AppendImageFormat(const char *format,char *filename)
%
% A description of each parameter follows.
%
% o format: Specifies a pointer to an array of characters. This the
% format of the image.
%
% o filename: Specifies a pointer to an array of characters. The unique
% file name is returned in this array.
%
*/
MagickExport void AppendImageFormat(const char *format,char *filename)
{
char
extension[MaxTextExtent],
root[MaxTextExtent];
assert(format != (char *) NULL);
assert(filename != (char *) NULL);
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",filename);
if ((*format == '\0') || (*filename == '\0'))
return;
if (LocaleCompare(filename,"-") == 0)
{
char
message[MaxTextExtent];
(void) FormatLocaleString(message,MaxTextExtent,"%s:%s",format,filename);
(void) CopyMagickString(filename,message,MaxTextExtent);
return;
}
GetPathComponent(filename,ExtensionPath,extension);
if ((LocaleCompare(extension,"Z") == 0) ||
(LocaleCompare(extension,"bz2") == 0) ||
(LocaleCompare(extension,"gz") == 0) ||
(LocaleCompare(extension,"wmz") == 0) ||
(LocaleCompare(extension,"svgz") == 0))
{
GetPathComponent(filename,RootPath,root);
(void) CopyMagickString(filename,root,MaxTextExtent);
GetPathComponent(filename,RootPath,root);
(void) FormatLocaleString(filename,MaxTextExtent,"%s.%s.%s",root,format,
extension);
return;
}
GetPathComponent(filename,RootPath,root);
(void) FormatLocaleString(filename,MaxTextExtent,"%s.%s",root,format);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% B a s e 6 4 D e c o d e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Base64Decode() decodes Base64-encoded text and returns its binary
% equivalent. NULL is returned if the text is not valid Base64 data, or a
% memory allocation failure occurs.
%
% The format of the Base64Decode method is:
%
% unsigned char *Base64Decode(const char *source,length_t *length)
%
% A description of each parameter follows:
%
% o source: A pointer to a Base64-encoded string.
%
% o length: the number of bytes decoded.
%
*/
MagickExport unsigned char *Base64Decode(const char *source,size_t *length)
{
int
state;
const char
*p,
*q;
size_t
i;
unsigned char
*decode;
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
assert(source != (char *) NULL);
assert(length != (size_t *) NULL);
*length=0;
decode=(unsigned char *) AcquireQuantumMemory((strlen(source)+3)/4,
3*sizeof(*decode));
if (decode == (unsigned char *) NULL)
return((unsigned char *) NULL);
i=0;
state=0;
for (p=source; *p != '\0'; p++)
{
if (isspace((int) ((unsigned char) *p)) != 0)
continue;
if (*p == '=')
break;
q=strchr(Base64,*p);
if (q == (char *) NULL)
{
decode=(unsigned char *) RelinquishMagickMemory(decode);
return((unsigned char *) NULL); /* non-Base64 character */
}
switch (state)
{
case 0:
{
decode[i]=(q-Base64) << 2;
state++;
break;
}
case 1:
{
decode[i++]|=(q-Base64) >> 4;
decode[i]=((q-Base64) & 0x0f) << 4;
state++;
break;
}
case 2:
{
decode[i++]|=(q-Base64) >> 2;
decode[i]=((q-Base64) & 0x03) << 6;
state++;
break;
}
case 3:
{
decode[i++]|=(q-Base64);
state=0;
break;
}
}
}
/*
Verify Base-64 string has proper terminal characters.
*/
if (*p != '=')
{
if (state != 0)
{
decode=(unsigned char *) RelinquishMagickMemory(decode);
return((unsigned char *) NULL);
}
}
else
{
p++;
switch (state)
{
case 0:
case 1:
{
/*
Unrecognized '=' character.
*/
decode=(unsigned char *) RelinquishMagickMemory(decode);
return((unsigned char *) NULL);
}
case 2:
{
for ( ; *p != '\0'; p++)
if (isspace((int) ((unsigned char) *p)) == 0)
break;
if (*p != '=')
{
decode=(unsigned char *) RelinquishMagickMemory(decode);
return((unsigned char *) NULL);
}
p++;
}
case 3:
{
for ( ; *p != '\0'; p++)
if (isspace((int) ((unsigned char) *p)) == 0)
{
decode=(unsigned char *) RelinquishMagickMemory(decode);
return((unsigned char *) NULL);
}
if ((int) decode[i] != 0)
{
decode=(unsigned char *) RelinquishMagickMemory(decode);
return((unsigned char *) NULL);
}
break;
}
}
}
*length=i;
return(decode);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% B a s e 6 4 E n c o d e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Base64Encode() encodes arbitrary binary data to Base64 encoded format as
% described by the "Base64 Content-Transfer-Encoding" section of RFC 2045 and
% returns the result as a null-terminated ASCII string. NULL is returned if
% a memory allocation failure occurs.
%
% The format of the Base64Encode method is:
%
% char *Base64Encode(const unsigned char *blob,const size_t blob_length,
% size_t *encode_length)
%
% A description of each parameter follows:
%
% o blob: A pointer to binary data to encode.
%
% o blob_length: the number of bytes to encode.
%
% o encode_length: The number of bytes encoded.
%
*/
MagickExport char *Base64Encode(const unsigned char *blob,
const size_t blob_length,size_t *encode_length)
{
char
*encode;
const unsigned char
*p;
size_t
i;
size_t
remainder;
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
assert(blob != (const unsigned char *) NULL);
assert(blob_length != 0);
assert(encode_length != (size_t *) NULL);
*encode_length=0;
encode=(char *) AcquireQuantumMemory(blob_length/3+4,4*sizeof(*encode));
if (encode == (char *) NULL)
return((char *) NULL);
i=0;
for (p=blob; p < (blob+blob_length-2); p+=3)
{
encode[i++]=Base64[(int) (*p >> 2)];
encode[i++]=Base64[(int) (((*p & 0x03) << 4)+(*(p+1) >> 4))];
encode[i++]=Base64[(int) (((*(p+1) & 0x0f) << 2)+(*(p+2) >> 6))];
encode[i++]=Base64[(int) (*(p+2) & 0x3f)];
}
remainder=blob_length % 3;
if (remainder != 0)
{
ssize_t
j;
unsigned char
code[3];
code[0]='\0';
code[1]='\0';
code[2]='\0';
for (j=0; j < (ssize_t) remainder; j++)
code[j]=(*p++);
encode[i++]=Base64[(int) (code[0] >> 2)];
encode[i++]=Base64[(int) (((code[0] & 0x03) << 4)+(code[1] >> 4))];
if (remainder == 1)
encode[i++]='=';
else
encode[i++]=Base64[(int) (((code[1] & 0x0f) << 2)+(code[2] >> 6))];
encode[i++]='=';
}
*encode_length=i;
encode[i++]='\0';
return(encode);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% C h o p P a t h C o m p o n e n t s %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ChopPathComponents() removes the number of specified file components from a
% path.
%
% The format of the ChopPathComponents method is:
%
% ChopPathComponents(char *path,size_t components)
%
% A description of each parameter follows:
%
% o path: The path.
%
% o components: The number of components to chop.
%
*/
MagickExport void ChopPathComponents(char *path,const size_t components)
{
ssize_t
i;
for (i=0; i < (ssize_t) components; i++)
GetPathComponent(path,HeadPath,path);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% E x p a n d F i l e n a m e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ExpandFilename() expands '~' in a path.
%
% The format of the ExpandFilename function is:
%
% ExpandFilename(char *path)
%
% A description of each parameter follows:
%
% o path: Specifies a pointer to a character array that contains the
% path.
%
*/
MagickExport void ExpandFilename(char *path)
{
char
expand_path[MaxTextExtent];
if (path == (char *) NULL)
return;
if (*path != '~')
return;
(void) CopyMagickString(expand_path,path,MaxTextExtent);
if ((*(path+1) == *DirectorySeparator) || (*(path+1) == '\0'))
{
char
*home;
/*
Substitute ~ with $HOME.
*/
(void) CopyMagickString(expand_path,".",MaxTextExtent);
(void) ConcatenateMagickString(expand_path,path+1,MaxTextExtent);
home=GetEnvironmentValue("HOME");
if (home == (char *) NULL)
home=GetEnvironmentValue("USERPROFILE");
if (home != (char *) NULL)
{
(void) CopyMagickString(expand_path,home,MaxTextExtent);
(void) ConcatenateMagickString(expand_path,path+1,MaxTextExtent);
home=DestroyString(home);
}
}
else
{
#if defined(MAGICKCORE_POSIX_SUPPORT) && !defined(__OS2__)
char
#if defined(MAGICKCORE_HAVE_GETPWNAM_R)
buffer[MagickPathExtent],
#endif
username[MaxTextExtent];
char
*p;
struct passwd
*entry;
/*
Substitute ~ with home directory from password file.
*/
(void) CopyMagickString(username,path+1,MaxTextExtent);
p=strchr(username,'/');
if (p != (char *) NULL)
*p='\0';
#if !defined(MAGICKCORE_HAVE_GETPWNAM_R)
entry=getpwnam(username);
#else
struct passwd
pwd;
entry=(struct passwd *) NULL;
if (getpwnam_r(username,&pwd,buffer,sizeof(buffer),&entry) < 0)
return;
#endif
if (entry == (struct passwd *) NULL)
return;
(void) CopyMagickString(expand_path,entry->pw_dir,MaxTextExtent);
if (p != (char *) NULL)
{
(void) ConcatenateMagickString(expand_path,"/",MaxTextExtent);
(void) ConcatenateMagickString(expand_path,p+1,MaxTextExtent);
}
#endif
}
(void) CopyMagickString(path,expand_path,MaxTextExtent);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% E x p a n d F i l e n a m e s %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ExpandFilenames() checks each argument of the given argument array, and
% expands it if they have a wildcard character.
%
% Any coder prefix (EG: 'coder:filename') or read modifier postfix (EG:
% 'filename[...]') are ignored during the file the expansion, but will be
% included in the final argument. If no filename matching the meta-character
% 'glob' is found the original argument is returned.
%
% For example, an argument of '*.gif[20x20]' will be replaced by the list
% 'abc.gif[20x20]', 'foobar.gif[20x20]', 'xyzzy.gif[20x20]'
% if such filenames exist, (in the current directory in this case).
%
% Meta-characters handled...
% @ read a list of filenames (no further expansion performed)
% ~ At start of filename expands to HOME environemtn variable
% * matches any string including an empty string
% ? matches by any single character
%
% WARNING: filenames starting with '.' (hidden files in a UNIX file system)
% will never be expanded. Attempting to epand '.*' will produce no change.
%
% Expansion is ignored for coders "label:" "caption:" "pango:" and "vid:".
% Which provide their own '@' meta-character handling.
%
% You can see the results of the expansion using "Configure" log events.
%
% The returned list should be freed using DestroyStringList().
%
% However the strings in the original pointed to argv are not
% freed (TO BE CHECKED). So a copy of the original pointer (and count)
% should be kept separate if they need to be freed later.
%
% The format of the ExpandFilenames function is:
%
% status=ExpandFilenames(int *number_arguments,char ***arguments)
%
% A description of each parameter follows:
%
% o number_arguments: Specifies a pointer to an integer describing the
% number of elements in the argument vector.
%
% o arguments: Specifies a pointer to a text array containing the command
% line arguments.
%
*/
MagickExport MagickBooleanType ExpandFilenames(int *number_arguments,
char ***arguments)
{
char
home_directory[MaxTextExtent],
**vector;
ssize_t
i,
j;
size_t
number_files;
ssize_t
count,
parameters;
/*
Allocate argument vector.
*/
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
assert(number_arguments != (int *) NULL);
assert(arguments != (char ***) NULL);
vector=(char **) AcquireQuantumMemory((size_t) (*number_arguments+1),
sizeof(*vector));
if (vector == (char **) NULL)
ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
/*
Expand any wildcard filenames.
*/
*home_directory='\0';
count=0;
for (i=0; i < (ssize_t) *number_arguments; i++)
{
char
**filelist,
filename[MaxTextExtent],
magick[MaxTextExtent],
*option,
path[MaxTextExtent],
subimage[MaxTextExtent];
MagickBooleanType
destroy;
option=(*arguments)[i];
*magick='\0';
*path='\0';
*filename='\0';
*subimage='\0';
number_files=0;
vector[count++]=ConstantString(option);
destroy=MagickTrue;
parameters=ParseCommandOption(MagickCommandOptions,MagickFalse,option);
if (parameters > 0)
{
/*
Do not expand command option parameters.
*/
for (j=0; j < parameters; j++)
{
i++;
if (i == (ssize_t) *number_arguments)
break;
option=(*arguments)[i];
vector[count++]=ConstantString(option);
}
continue;
}
if ((*option == '"') || (*option == '\''))
continue;
GetPathComponent(option,TailPath,filename);
GetPathComponent(option,MagickPath,magick);
if ((LocaleCompare(magick,"CAPTION") == 0) ||
(LocaleCompare(magick,"LABEL") == 0) ||
(LocaleCompare(magick,"PANGO") == 0) ||
(LocaleCompare(magick,"VID") == 0))
continue;
if ((IsGlob(filename) == MagickFalse) && (*option != '@'))
continue;
if ((*option != '@') && (IsPathAccessible(option) == MagickFalse))
{
/*
Generate file list from wildcard filename (e.g. *.jpg).
*/
GetPathComponent(option,HeadPath,path);
GetPathComponent(option,SubimagePath,subimage);
ExpandFilename(path);
if (*home_directory == '\0')
getcwd_utf8(home_directory,MaxTextExtent-1);
filelist=ListFiles(*path == '\0' ? home_directory : path,filename,
&number_files);
}
else
{
char
*files;
ExceptionInfo
*exception;
int
length;
/*
Generate file list from file list (e.g. @filelist.txt).
*/
exception=AcquireExceptionInfo();
files=FileToString(option+1,~0UL,exception);
exception=DestroyExceptionInfo(exception);
if (files == (char *) NULL)
continue;
filelist=StringToArgv(files,&length);
if (filelist == (char **) NULL)
continue;
files=DestroyString(files);
filelist[0]=DestroyString(filelist[0]);
for (j=0; j < (ssize_t) (length-1); j++)
filelist[j]=filelist[j+1];
number_files=(size_t) length-1;
}
if (filelist == (char **) NULL)
continue;
for (j=0; j < (ssize_t) number_files; j++)
if (IsPathDirectory(filelist[j]) <= 0)
break;
if (j == (ssize_t) number_files)
{
for (j=0; j < (ssize_t) number_files; j++)
filelist[j]=DestroyString(filelist[j]);
filelist=(char **) RelinquishMagickMemory(filelist);
continue;
}
/*
Transfer file list to argument vector.
*/
vector=(char **) ResizeQuantumMemory(vector,(size_t) *number_arguments+
count+number_files+1,sizeof(*vector));
if (vector == (char **) NULL)
{
for (j=0; j < (ssize_t) number_files; j++)
filelist[j]=DestroyString(filelist[j]);
filelist=(char **) RelinquishMagickMemory(filelist);
return(MagickFalse);
}
for (j=0; j < (ssize_t) number_files; j++)
{
option=filelist[j];
parameters=ParseCommandOption(MagickCommandOptions,MagickFalse,option);
if (parameters > 0)
{
ssize_t
k;
/*
Do not expand command option parameters.
*/
vector[count++]=ConstantString(option);
for (k=0; k < parameters; k++)
{
j++;
if (j == (ssize_t) number_files)
break;
option=filelist[j];
vector[count++]=ConstantString(option);
}
continue;
}
(void) CopyMagickString(filename,path,MaxTextExtent);
if (*path != '\0')
(void) ConcatenateMagickString(filename,DirectorySeparator,
MaxTextExtent);
if (filelist[j] != (char *) NULL)
(void) ConcatenateMagickString(filename,filelist[j],MaxTextExtent);
filelist[j]=DestroyString(filelist[j]);
if (strlen(filename) >= (MaxTextExtent-1))
ThrowFatalException(OptionFatalError,"FilenameTruncated");
if (IsPathDirectory(filename) <= 0)
{
char
path[MaxTextExtent];
*path='\0';
if (*magick != '\0')
{
(void) ConcatenateMagickString(path,magick,MaxTextExtent);
(void) ConcatenateMagickString(path,":",MaxTextExtent);
}
(void) ConcatenateMagickString(path,filename,MaxTextExtent);
if (*subimage != '\0')
{
(void) ConcatenateMagickString(path,"[",MaxTextExtent);
(void) ConcatenateMagickString(path,subimage,MaxTextExtent);
(void) ConcatenateMagickString(path,"]",MaxTextExtent);
}
if (strlen(path) >= (MaxTextExtent-1))
ThrowFatalException(OptionFatalError,"FilenameTruncated");
if (destroy != MagickFalse)
{
count--;
vector[count]=DestroyString(vector[count]);
destroy=MagickFalse;
}
vector[count++]=ConstantString(path);
}
}
filelist=(char **) RelinquishMagickMemory(filelist);
}
vector[count]=(char *) NULL;
if (IsEventLogging() != MagickFalse)
{
char
*command_line;
command_line=AcquireString(vector[0]);
for (i=1; i < count; i++)
{
(void) ConcatenateString(&command_line," {");
(void) ConcatenateString(&command_line,vector[i]);
(void) ConcatenateString(&command_line,"}");
}
(void) LogMagickEvent(ConfigureEvent,GetMagickModule(),
"Command line: %s",command_line);
command_line=DestroyString(command_line);
}
*number_arguments=(int) count;
*arguments=vector;
return(MagickTrue);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t E x e c u t i o n P a t h %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetExecutionPath() returns the pathname of the executable that started
% the process. On success MagickTrue is returned, otherwise MagickFalse.
%
% The format of the GetExecutionPath method is:
%
% MagickBooleanType GetExecutionPath(char *path,const size_t extent)
%
% A description of each parameter follows:
%
% o path: the pathname of the executable that started the process.
%
% o extent: the maximum extent of the path.
%
*/
MagickExport MagickBooleanType GetExecutionPath(char *path,const size_t extent)
{
char
*directory;
*path='\0';
directory=getcwd(path,(unsigned long) extent);
(void) directory;
#if defined(MAGICKCORE_HAVE_GETPID) && defined(MAGICKCORE_HAVE_READLINK) && defined(PATH_MAX)
{
char
link_path[MaxTextExtent],
execution_path[PATH_MAX+1];
ssize_t
count;
(void) FormatLocaleString(link_path,MaxTextExtent,"/proc/%.20g/exe",
(double) getpid());
count=readlink(link_path,execution_path,PATH_MAX);
if (count == -1)
{
(void) FormatLocaleString(link_path,MaxTextExtent,"/proc/%.20g/file",
(double) getpid());
count=readlink(link_path,execution_path,PATH_MAX);
}
if ((count > 0) && (count <= (ssize_t) PATH_MAX))
{
execution_path[count]='\0';
(void) CopyMagickString(path,execution_path,extent);
}
}
#endif
#if defined(MAGICKCORE_HAVE__NSGETEXECUTABLEPATH)
{
char
executable_path[PATH_MAX << 1],
execution_path[PATH_MAX+1];
uint32_t
length;
length=sizeof(executable_path);
if ((_NSGetExecutablePath(executable_path,&length) == 0) &&
(realpath(executable_path,execution_path) != (char *) NULL))
(void) CopyMagickString(path,execution_path,extent);
}
#endif
#if defined(MAGICKCORE_HAVE_GETEXECNAME)
{
const char
*execution_path;
execution_path=(const char *) getexecname();
if (execution_path != (const char *) NULL)
{
if (*execution_path != *DirectorySeparator)
(void) ConcatenateMagickString(path,DirectorySeparator,extent);
(void) ConcatenateMagickString(path,execution_path,extent);
}
}
#endif
#if defined(MAGICKCORE_WINDOWS_SUPPORT)
NTGetExecutionPath(path,extent);
#endif
#if defined(__GNU__)
{
char
*program_name;
ssize_t
count;
count=0;
program_name=program_invocation_name;
if (*program_invocation_name != '/')
{
size_t
extent;
extent=strlen(directory)+strlen(program_name)+2;
program_name=AcquireQuantumMemory(extent,sizeof(*program_name));
if (program_name == (char *) NULL)
program_name=program_invocation_name;
else
count=FormatLocaleString(program_name,extent,"%s/%s",directory,
program_invocation_name);
}
if (count != -1)
{
char
execution_path[PATH_MAX+1];
if (realpath(program_name,execution_path) != (char *) NULL)
(void) CopyMagickString(path,execution_path,extent);
}
if (program_name != program_invocation_name)
program_name=(char *) RelinquishMagickMemory(program_name);
}
#endif
#if defined(__OpenBSD__)
{
extern char
*__progname;
(void) CopyMagickString(path,__progname,extent);
}
#endif
return(IsPathAccessible(path));
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t M a g i c k P a g e S i z e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetMagickPageSize() returns the memory page size.
%
% The format of the GetMagickPageSize method is:
%
% ssize_t GetMagickPageSize()
%
*/
MagickExport ssize_t GetMagickPageSize(void)
{
static ssize_t
page_size = -1;
if (page_size > 0)
return(page_size);
#if defined(MAGICKCORE_HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
page_size=(ssize_t) sysconf(_SC_PAGE_SIZE);
#elif defined(MAGICKCORE_HAVE_GETPAGESIZE)
page_size=(ssize_t) getpagesize();
#endif
if (page_size <= 0)
page_size=4096;
return(page_size);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t P a t h A t t r i b u t e s %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetPathAttributes() returns attributes (e.g. size of file) about a path.
%
% The path of the GetPathAttributes method is:
%
% MagickBooleanType GetPathAttributes(const char *path,void *attributes)
%
% A description of each parameter follows.
%
% o path: the file path.
%
% o attributes: the path attributes are returned here.
%
*/
MagickExport MagickBooleanType GetPathAttributes(const char *path,
void *attributes)
{
MagickBooleanType
status;
if (path == (const char *) NULL)
{
errno=EINVAL;
return(MagickFalse);
}
(void) memset(attributes,0,sizeof(struct stat));
status=stat_utf8(path,(struct stat *) attributes) == 0 ? MagickTrue :
MagickFalse;
return(status);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t P a t h C o m p o n e n t %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetPathComponent() returns the parent directory name, filename, basename, or
% extension of a file path.
%
% The component string pointed to must have at least MaxTextExtent space
% for the results to be stored.
%
% The format of the GetPathComponent function is:
%
% GetPathComponent(const char *path,PathType type,char *component)
%
% A description of each parameter follows:
%
% o path: Specifies a pointer to a character array that contains the
% file path.
%
% o type: Specififies which file path component to return.
%
% o component: the selected file path component is returned here.
%
*/
MagickExport void GetPathComponent(const char *path,PathType type,
char *component)
{
char
*q;
char
*p;
size_t
magick_length,
subimage_offset,
subimage_length;
assert(path != (const char *) NULL);
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",path);
assert(component != (char *) NULL);
if (*path == '\0')
{
*component='\0';
return;
}
(void) CopyMagickString(component,path,MagickPathExtent);
subimage_length=0;
subimage_offset=0;
if (type != SubcanonicalPath)
{
p=component+strlen(component)-1;
if ((strlen(component) > 2) && (*p == ']'))
{
q=strrchr(component,'[');
if ((q != (char *) NULL) && ((q == component) || (*(q-1) != ']')) &&
(IsPathAccessible(path) == MagickFalse))
{
/*
Look for scene specification (e.g. img0001.pcd[4]).
*/
*p='\0';
if ((IsSceneGeometry(q+1,MagickFalse) == MagickFalse) &&
(IsGeometry(q+1) == MagickFalse))
*p=']';
else
{
subimage_length=(size_t) (p-q);
subimage_offset=(size_t) (q-component+1);
*q='\0';
}
}
}
}
magick_length=0;
#if defined(__OS2__)
if (path[1] != ":")
#endif
for (p=component; *p != '\0'; p++)
{
if ((*p == '%') && (*(p+1) == '['))
{
/*
Skip over %[...].
*/
for (p++; (*p != ']') && (*p != '\0'); p++) ;
if (*p == '\0')
break;
}
if ((p != component) && (*p == ':') && (IsPathDirectory(component) < 0) &&
(IsPathAccessible(component) == MagickFalse))
{
/*
Look for image format specification (e.g. ps3:image).
*/
*p='\0';
if (IsMagickConflict(component) != MagickFalse)
*p=':';
else
{
magick_length=(size_t) (p-component+1);
for (q=component; *(++p) != '\0'; q++)
*q=(*p);
*q='\0';
}
break;
}
}
p=component;
if (*p != '\0')
for (p=component+strlen(component)-1; p > component; p--)
if (IsBasenameSeparator(*p) != MagickFalse)
break;
switch (type)
{
case MagickPath:
{
if (magick_length != 0)
(void) CopyMagickString(component,path,magick_length);
else
*component='\0';
break;
}
case RootPath:
{
if (*component != '\0')
{
for (p=component+(strlen(component)-1); p > component; p--)
{
if (IsBasenameSeparator(*p) != MagickFalse)
break;
if (*p == '.')
break;
}
if (*p == '.')
*p='\0';
break;
}
}
case HeadPath:
{
*p='\0';
break;
}
case TailPath:
{
if (IsBasenameSeparator(*p) != MagickFalse)
(void) CopyMagickString(component,p+1,MagickPathExtent);
break;
}
case BasePath:
{
if (IsBasenameSeparator(*p) != MagickFalse)
(void) CopyMagickString(component,p+1,MagickPathExtent);
if (*component != '\0')
for (p=component+(strlen(component)-1); p > component; p--)
if (*p == '.')
{
*p='\0';
break;
}
break;
}
case ExtensionPath:
{
if (IsBasenameSeparator(*p) != MagickFalse)
(void) CopyMagickString(component,p+1,MagickPathExtent);
if (*component != '\0')
for (p=component+strlen(component)-1; p > component; p--)
if (*p == '.')
break;
*component='\0';
if (*p == '.')
(void) CopyMagickString(component,p+1,MagickPathExtent);
break;
}
case SubimagePath:
{
*component='\0';
if ((subimage_length != 0) && (magick_length < subimage_offset))
(void) CopyMagickString(component,path+subimage_offset,subimage_length);
break;
}
case SubcanonicalPath:
case CanonicalPath:
case UndefinedPath:
break;
}
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t P a t h C o m p o n e n t s %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetPathComponents() returns a list of path components.
%
% The format of the GetPathComponents method is:
%
% char **GetPathComponents(const char *path,
% size_t *number_componenets)
%
% A description of each parameter follows:
%
% o path: Specifies the string to segment into a list.
%
% o number_components: return the number of components in the list
%
*/
MagickExport char **GetPathComponents(const char *path,
size_t *number_components)
{
char
**components;
const char
*p,
*q;
ssize_t
i;
if (path == (char *) NULL)
return((char **) NULL);
*number_components=1;
for (p=path; *p != '\0'; p++)
if (IsBasenameSeparator(*p))
(*number_components)++;
components=(char **) AcquireQuantumMemory((size_t) *number_components+1UL,
sizeof(*components));
if (components == (char **) NULL)
ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
p=path;
for (i=0; i < (ssize_t) *number_components; i++)
{
for (q=p; *q != '\0'; q++)
if (IsBasenameSeparator(*q))
break;
components[i]=(char *) AcquireQuantumMemory((size_t) (q-p)+MaxTextExtent,
sizeof(**components));
if (components[i] == (char *) NULL)
ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
(void) CopyMagickString(components[i],p,(size_t) (q-p+1));
p=q+1;
}
components[i]=(char *) NULL;
return(components);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% I s P a t h A c c e s s i b l e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% IsPathAccessible() returns MagickTrue if the file as defined by the path is
% accessible.
%
% The format of the IsPathAccessible method is:
%
% MagickBooleanType IsPathAccessible(const char *path)
%
% A description of each parameter follows.
%
% o path: Specifies a path to a file.
%
*/
MagickExport MagickBooleanType IsPathAccessible(const char *path)
{
MagickBooleanType
status;
struct stat
attributes;
if ((path == (const char *) NULL) || (*path == '\0'))
return(MagickFalse);
if (LocaleCompare(path,"-") == 0)
return(MagickTrue);
status=GetPathAttributes(path,&attributes);
if (status == MagickFalse)
return(status);
if (S_ISREG(attributes.st_mode) == 0)
return(MagickFalse);
if (access_utf8(path,F_OK) != 0)
return(MagickFalse);
return(MagickTrue);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ I s P a t h D i r e c t o r y %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% IsPathDirectory() returns -1 if the directory does not exist, 1 is returned
% if the path represents a directory otherwise 0.
%
% The format of the IsPathDirectory method is:
%
% int IsPathDirectory(const char *path)
%
% A description of each parameter follows.
%
% o path: The directory path.
%
*/
static int IsPathDirectory(const char *path)
{
MagickBooleanType
status;
struct stat
attributes;
if ((path == (const char *) NULL) || (*path == '\0'))
return(MagickFalse);
status=GetPathAttributes(path,&attributes);
if (status == MagickFalse)
return(-1);
if (S_ISDIR(attributes.st_mode) == 0)
return(0);
return(1);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% L i s t F i l e s %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ListFiles() reads the directory specified and returns a list of filenames
% contained in the directory sorted in ascending alphabetic order.
%
% The format of the ListFiles function is:
%
% char **ListFiles(const char *directory,const char *pattern,
% ssize_t *number_entries)
%
% A description of each parameter follows:
%
% o filelist: Method ListFiles returns a list of filenames contained
% in the directory. If the directory specified cannot be read or it is
% a file a NULL list is returned.
%
% o directory: Specifies a pointer to a text string containing a directory
% name.
%
% o pattern: Specifies a pointer to a text string containing a pattern.
%
% o number_entries: This integer returns the number of filenames in the
% list.
%
*/
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
static int FileCompare(const void *x,const void *y)
{
const char
**p,
**q;
p=(const char **) x;
q=(const char **) y;
return(LocaleCompare(*p,*q));
}
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
MagickExport char **ListFiles(const char *directory,const char *pattern,
size_t *number_entries)
{
char
**filelist;
DIR
*current_directory;
struct dirent
*buffer,
*entry;
size_t
max_entries;
/*
Open directory.
*/
assert(directory != (const char *) NULL);
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",directory);
assert(pattern != (const char *) NULL);
assert(number_entries != (size_t *) NULL);
*number_entries=0;
current_directory=opendir(directory);
if (current_directory == (DIR *) NULL)
return((char **) NULL);
/*
Allocate filelist.
*/
max_entries=2048;
filelist=(char **) AcquireQuantumMemory((size_t) max_entries,
sizeof(*filelist));
if (filelist == (char **) NULL)
{
(void) closedir(current_directory);
return((char **) NULL);
}
/*
Save the current and change to the new directory.
*/
buffer=(struct dirent *) AcquireMagickMemory(sizeof(*buffer)+FILENAME_MAX+1);
if (buffer == (struct dirent *) NULL)
ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
while ((MagickReadDirectory(current_directory,buffer,&entry) == 0) &&
(entry != (struct dirent *) NULL))
{
if ((LocaleCompare(entry->d_name,".") == 0) ||
(LocaleCompare(entry->d_name,"..") == 0))
continue;
if ((IsPathDirectory(entry->d_name) > 0) ||
#if defined(MAGICKCORE_WINDOWS_SUPPORT)
(GlobExpression(entry->d_name,pattern,MagickTrue) != MagickFalse))
#else
(GlobExpression(entry->d_name,pattern,MagickFalse) != MagickFalse))
#endif
{
if (*number_entries >= max_entries)
{
/*
Extend the file list.
*/
max_entries<<=1;
filelist=(char **) ResizeQuantumMemory(filelist,(size_t)
max_entries,sizeof(*filelist));
if (filelist == (char **) NULL)
break;
}
#if defined(vms)
{
char
*p;
p=strchr(entry->d_name,';');
if (p)
*p='\0';
if (*number_entries > 0)
if (LocaleCompare(entry->d_name,filelist[*number_entries-1]) == 0)
continue;
}
#endif
filelist[*number_entries]=(char *) AcquireString(entry->d_name);
(*number_entries)++;
}
}
buffer=(struct dirent *) RelinquishMagickMemory(buffer);
(void) closedir(current_directory);
if (filelist == (char **) NULL)
return((char **) NULL);
/*
Sort filelist in ascending order.
*/
qsort((void *) filelist,(size_t) *number_entries,sizeof(*filelist),
FileCompare);
return(filelist);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% M a g i c k D e l a y %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% MagickDelay() suspends program execution for the number of milliseconds
% specified.
%
% The format of the Delay method is:
%
% void MagickDelay(const MagickSizeType milliseconds)
%
% A description of each parameter follows:
%
% o milliseconds: Specifies the number of milliseconds to delay before
% returning.
%
*/
MagickExport void MagickDelay(const MagickSizeType milliseconds)
{
if (milliseconds == 0)
return;
#if defined(MAGICKCORE_HAVE_NANOSLEEP)
{
struct timespec
timer;
timer.tv_sec=(time_t) (milliseconds/1000);
timer.tv_nsec=(milliseconds % 1000)*1000*1000;
(void) nanosleep(&timer,(struct timespec *) NULL);
}
#elif defined(MAGICKCORE_HAVE_USLEEP)
usleep(1000*milliseconds);
#elif defined(MAGICKCORE_HAVE_SELECT)
{
struct timeval
timer;
timer.tv_sec=(long) milliseconds/1000;
timer.tv_usec=(long) (milliseconds % 1000)*1000;
(void) select(0,(XFD_SET *) NULL,(XFD_SET *) NULL,(XFD_SET *) NULL,&timer);
}
#elif defined(MAGICKCORE_HAVE_POLL)
(void) poll((struct pollfd *) NULL,0,(int) milliseconds);
#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
Sleep((long) milliseconds);
#elif defined(vms)
{
float
timer;
timer=milliseconds/1000.0;
lib$wait(&timer);
}
#elif defined(__BEOS__)
snooze(1000*milliseconds);
#else
{
clock_t
time_end;
time_end=clock()+milliseconds*CLOCKS_PER_SEC/1000;
while (clock() < time_end)
{
}
}
#endif
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% M u l t i l i n e C e n s u s %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% MultilineCensus() returns the number of lines within a label. A line is
% represented by a \n character.
%
% The format of the MultilineCenus method is:
%
% size_t MultilineCensus(const char *label)
%
% A description of each parameter follows.
%
% o label: This character string is the label.
%
%
*/
MagickExport size_t MultilineCensus(const char *label)
{
size_t
number_lines;
/*
Determine the number of lines within this label.
*/
if (label == (char *) NULL)
return(0);
for (number_lines=1; *label != '\0'; label++)
if (*label == '\n')
number_lines++;
return(number_lines);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% S h r e d F i l e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ShredFile() overwrites the specified file with zeros or random data and then
% removes it. The overwrite is optional and is only required to help keep
% the contents of the file private. On the first pass, the file is zeroed.
% For subsequent passes, random data is written.
%
% The format of the ShredFile method is:
%
% MagickBooleanType ShredFile(const char *path)
%
% A description of each parameter follows.
%
% o path: Specifies a path to a file.
%
*/
MagickPrivate MagickBooleanType ShredFile(const char *path)
{
char
*passes;
int
file,
status;
MagickSizeType
length;
ssize_t
i;
size_t
quantum;
struct stat
file_stats;
if ((path == (const char *) NULL) || (*path == '\0'))
return(MagickFalse);
passes=GetPolicyValue("system:shred");
if (passes == (char *) NULL)
passes=GetEnvironmentValue("MAGICK_SHRED_PASSES");
if (passes == (char *) NULL)
{
/*
Don't shred the file, just remove it.
*/
passes=DestroyString(passes);
status=remove_utf8(path);
if (status == -1)
{
(void) LogMagickEvent(ExceptionEvent,GetMagickModule(),
"Failed to remove: %s",path);
return(MagickFalse);
}
return(MagickTrue);
}
file=open_utf8(path,O_WRONLY | O_EXCL | O_BINARY,S_MODE);
if (file == -1)
{
/*
Don't shred the file, just remove it.
*/
passes=DestroyString(passes);
status=remove_utf8(path);
if (status == -1)
(void) LogMagickEvent(ExceptionEvent,GetMagickModule(),
"Failed to remove: %s",path);
return(MagickFalse);
}
/*
Shred the file.
*/
quantum=(size_t) MagickMaxBufferExtent;
if ((fstat(file,&file_stats) == 0) && (file_stats.st_size > 0))
quantum=(size_t) MagickMin(file_stats.st_size,MagickMaxBufferExtent);
length=(MagickSizeType) file_stats.st_size;
for (i=0; i < (ssize_t) StringToInteger(passes); i++)
{
RandomInfo
*random_info;
MagickOffsetType
j;
ssize_t
count;
if (lseek(file,0,SEEK_SET) < 0)
break;
random_info=AcquireRandomInfo();
for (j=0; j < (MagickOffsetType) length; j+=count)
{
StringInfo
*key;
key=GetRandomKey(random_info,quantum);
if (i == 0)
ResetStringInfo(key); /* zero on first pass */
count=write(file,GetStringInfoDatum(key),(size_t)
MagickMin((MagickSizeType) quantum,length-j));
key=DestroyStringInfo(key);
if (count <= 0)
{
count=0;
if (errno != EINTR)
break;
}
}
random_info=DestroyRandomInfo(random_info);
if (j < (MagickOffsetType) length)
break;
}
status=close(file);
status=remove_utf8(path);
if (status != -1)
status=StringToInteger(passes);
passes=DestroyString(passes);
return((status == -1 || i < (ssize_t) status) ? MagickFalse : MagickTrue);
}