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magic.c
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magic.c
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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% M M AAA GGGG IIIII CCCC %
% MM MM A A G I C %
% M M M AAAAA G GGG I C %
% M M A A G G I C %
% M M A A GGGG IIIII CCCC %
% %
% %
% MagickCore Image Magic Methods %
% %
% Software Design %
% Bob Friesenhahn %
% July 2000 %
% %
% %
% Copyright 1999-2016 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 %
% %
% http://www.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 "MagickCore/studio.h"
#include "MagickCore/blob.h"
#include "MagickCore/client.h"
#include "MagickCore/configure.h"
#include "MagickCore/configure-private.h"
#include "MagickCore/exception.h"
#include "MagickCore/exception-private.h"
#include "MagickCore/linked-list.h"
#include "MagickCore/magic.h"
#include "MagickCore/magic-private.h"
#include "MagickCore/memory_.h"
#include "MagickCore/semaphore.h"
#include "MagickCore/string_.h"
#include "MagickCore/string-private.h"
#include "MagickCore/token.h"
#include "MagickCore/utility.h"
#include "MagickCore/utility-private.h"
#include "MagickCore/xml-tree.h"
#include "MagickCore/xml-tree-private.h"
/*
Define declarations.
*/
#define MagicFilename "magic.xml"
#define MagicPattern(magic) (const unsigned char *) (magic), sizeof(magic)-1
/*
Typedef declarations.
*/
typedef struct _MagicMapInfo
{
const char
*name;
const MagickOffsetType
offset;
const unsigned char
*magic;
const size_t
length;
} MagicMapInfo;
/*
Static declarations.
*/
static const MagicMapInfo
MagicMap[] =
{
{ "8BIMWTEXT", 0, MagicPattern("8\000B\000I\000M\000#") },
{ "8BIMTEXT", 0, MagicPattern("8BIM#") },
{ "8BIM", 0, MagicPattern("8BIM") },
{ "BMP", 0, MagicPattern("BA") },
{ "BMP", 0, MagicPattern("BM") },
{ "BMP", 0, MagicPattern("CI") },
{ "BMP", 0, MagicPattern("CP") },
{ "BMP", 0, MagicPattern("IC") },
{ "PICT", 0, MagicPattern("PICT") },
{ "BMP", 0, MagicPattern("PI") },
{ "CALS", 21, MagicPattern("version: MIL-STD-1840") },
{ "CALS", 0, MagicPattern("srcdocid:") },
{ "CALS", 9, MagicPattern("srcdocid:") },
{ "CALS", 8, MagicPattern("rorient:") },
{ "CGM", 0, MagicPattern("BEGMF") },
{ "CIN", 0, MagicPattern("\200\052\137\327") },
{ "CRW", 0, MagicPattern("II\x1a\x00\x00\x00HEAPCCDR") },
{ "DCM", 128, MagicPattern("DICM") },
{ "DCX", 0, MagicPattern("\261\150\336\72") },
{ "DIB", 0, MagicPattern("\050\000") },
{ "DDS", 0, MagicPattern("DDS ") },
{ "DJVU", 0, MagicPattern("AT&TFORM") },
{ "DOT", 0, MagicPattern("digraph") },
{ "DPX", 0, MagicPattern("SDPX") },
{ "DPX", 0, MagicPattern("XPDS") },
{ "EMF", 40, MagicPattern("\040\105\115\106\000\000\001\000") },
{ "EPT", 0, MagicPattern("\305\320\323\306") },
{ "EXR", 0, MagicPattern("\166\057\061\001") },
{ "FAX", 0, MagicPattern("DFAX") },
{ "FIG", 0, MagicPattern("#FIG") },
{ "FITS", 0, MagicPattern("IT0") },
{ "FITS", 0, MagicPattern("SIMPLE") },
{ "FLIF", 0, MagicPattern("FLIF") },
{ "GIF", 0, MagicPattern("GIF8") },
{ "GPLT", 0, MagicPattern("#!/usr/local/bin/gnuplot") },
{ "HDF", 1, MagicPattern("HDF") },
{ "HDR", 0, MagicPattern("#?RADIANCE") },
{ "HDR", 0, MagicPattern("#?RGBE") },
{ "HPGL", 0, MagicPattern("IN;") },
{ "HTML", 1, MagicPattern("HTML") },
{ "HTML", 1, MagicPattern("html") },
{ "ILBM", 8, MagicPattern("ILBM") },
{ "IPTCWTEXT", 0, MagicPattern("\062\000#\000\060\000=\000\042\000&\000#\000\060\000;\000&\000#\000\062\000;\000\042\000") },
{ "IPTCTEXT", 0, MagicPattern("2#0=\042�\042") },
{ "IPTC", 0, MagicPattern("\034\002") },
{ "JNG", 0, MagicPattern("\213JNG\r\n\032\n") },
{ "JPEG", 0, MagicPattern("\377\330\377") },
{ "J2K", 0, MagicPattern("\xff\x4f\xff\x51") },
{ "JPC", 0, MagicPattern("\x0d\x0a\x87\x0a") },
{ "JP2", 0, MagicPattern("\x00\x00\x00\x0c\x6a\x50\x20\x20\x0d\x0a\x87\x0a") },
{ "MAT", 0, MagicPattern("MATLAB 5.0 MAT-file,") },
{ "MIFF", 0, MagicPattern("Id=ImageMagick") },
{ "MIFF", 0, MagicPattern("id=ImageMagick") },
{ "MNG", 0, MagicPattern("\212MNG\r\n\032\n") },
{ "MPC", 0, MagicPattern("id=MagickCache") },
{ "MPEG", 0, MagicPattern("\000\000\001\263") },
{ "MRW", 0, MagicPattern("\x00MRM") },
{ "MVG", 0, MagicPattern("push graphic-context") },
{ "ORF", 0, MagicPattern("IIRO\x08\x00\x00\x00") },
{ "PCD", 2048, MagicPattern("PCD_") },
{ "PCL", 0, MagicPattern("\033E\033") },
{ "PCX", 0, MagicPattern("\012\002") },
{ "PCX", 0, MagicPattern("\012\005") },
{ "PDB", 60, MagicPattern("vIMGView") },
{ "PDF", 0, MagicPattern("%PDF-") },
{ "PES", 0, MagicPattern("#PES") },
{ "PFA", 0, MagicPattern("%!PS-AdobeFont-1.0") },
{ "PFB", 6, MagicPattern("%!PS-AdobeFont-1.0") },
{ "PGX", 0, MagicPattern("\050\107\020\115\046") },
{ "PICT", 522, MagicPattern("\000\021\002\377\014\000") },
{ "PNG", 0, MagicPattern("\211PNG\r\n\032\n") },
{ "PBM", 0, MagicPattern("P1") },
{ "PGM", 0, MagicPattern("P2") },
{ "PPM", 0, MagicPattern("P3") },
{ "PBM", 0, MagicPattern("P4") },
{ "PGM", 0, MagicPattern("P5") },
{ "PPM", 0, MagicPattern("P6") },
{ "PAM", 0, MagicPattern("P7") },
{ "PFM", 0, MagicPattern("PF") },
{ "PFM", 0, MagicPattern("Pf") },
{ "PS", 0, MagicPattern("%!") },
{ "PS", 0, MagicPattern("\004%!") },
{ "PS", 0, MagicPattern("\305\320\323\306") },
{ "PSB", 0, MagicPattern("8BPB") },
{ "PSD", 0, MagicPattern("8BPS") },
{ "PWP", 0, MagicPattern("SFW95") },
{ "RAF", 0, MagicPattern("FUJIFILMCCD-RAW ") },
{ "RLE", 0, MagicPattern("\122\314") },
{ "SCT", 0, MagicPattern("CT") },
{ "SFW", 0, MagicPattern("SFW94") },
{ "SGI", 0, MagicPattern("\001\332") },
{ "SUN", 0, MagicPattern("\131\246\152\225") },
{ "SVG", 1, MagicPattern("?XML") },
{ "SVG", 1, MagicPattern("?xml") },
{ "TIFF", 0, MagicPattern("\115\115\000\052") },
{ "TIFF", 0, MagicPattern("\111\111\052\000") },
{ "TIFF64", 0, MagicPattern("\115\115\000\053\000\010\000\000") },
{ "TIFF64", 0, MagicPattern("\111\111\053\000\010\000\000\000") },
{ "TTF", 0, MagicPattern("\000\001\000\000\000") },
{ "TXT", 0, MagicPattern("# ImageMagick pixel enumeration:") },
{ "VICAR", 0, MagicPattern("LBLSIZE") },
{ "VICAR", 0, MagicPattern("NJPL1I") },
{ "VIFF", 0, MagicPattern("\253\001") },
{ "WEBP", 8, MagicPattern("WEBP") },
{ "WMF", 0, MagicPattern("\327\315\306\232") },
{ "WMF", 0, MagicPattern("\001\000\011\000") },
{ "WPG", 0, MagicPattern("\377WPC") },
{ "XBM", 0, MagicPattern("#define") },
{ "XCF", 0, MagicPattern("gimp xcf") },
{ "XEF", 0, MagicPattern("FOVb") },
{ "XPM", 1, MagicPattern("* XPM *") },
{ "XWD", 4, MagicPattern("\007\000\000") },
{ "XWD", 5, MagicPattern("\000\000\007") }
};
static LinkedListInfo
*magic_cache = (LinkedListInfo *) NULL;
static SemaphoreInfo
*magic_semaphore = (SemaphoreInfo *) NULL;
/*
Forward declarations.
*/
static MagickBooleanType
IsMagicCacheInstantiated(ExceptionInfo *),
LoadMagicCache(LinkedListInfo *,const char *,const char *,const size_t,
ExceptionInfo *);
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% A c q u i r e M a g i c L i s t s %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% AcquireMagicCache() caches one or more magic configurations which provides a
% mapping between magic attributes and a magic name.
%
% The format of the AcquireMagicCache method is:
%
% LinkedListInfo *AcquireMagicCache(const char *filename,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o filename: the font file name.
%
% o exception: return any errors or warnings in this structure.
%
*/
static int CompareMagickInfoSize(const void *a,const void *b)
{
MagicInfo
*ma,
*mb;
ma=(MagicInfo *) a;
mb=(MagicInfo *) b;
if (ma->offset != mb->offset)
return((int) (ma->offset-mb->offset));
return((int) (mb->length-ma->length));
}
static LinkedListInfo *AcquireMagicCache(const char *filename,
ExceptionInfo *exception)
{
char
path[MagickPathExtent];
const StringInfo
*option;
LinkedListInfo
*magic_cache,
*options;
MagickStatusType
status;
register ssize_t
i;
/*
Load external magic map.
*/
magic_cache=NewLinkedList(0);
if (magic_cache == (LinkedListInfo *) NULL)
ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
status=MagickTrue;
*path='\0';
options=GetConfigureOptions(filename,exception);
option=(const StringInfo *) GetNextValueInLinkedList(options);
while (option != (const StringInfo *) NULL)
{
(void) CopyMagickString(path,GetStringInfoPath(option),MagickPathExtent);
status&=LoadMagicCache(magic_cache,(const char *)
GetStringInfoDatum(option),GetStringInfoPath(option),0,exception);
option=(const StringInfo *) GetNextValueInLinkedList(options);
}
options=DestroyConfigureOptions(options);
/*
Load built-in magic map.
*/
for (i=0; i < (ssize_t) (sizeof(MagicMap)/sizeof(*MagicMap)); i++)
{
MagicInfo
*magic_info;
register const MagicMapInfo
*p;
p=MagicMap+i;
magic_info=(MagicInfo *) AcquireMagickMemory(sizeof(*magic_info));
if (magic_info == (MagicInfo *) NULL)
{
(void) ThrowMagickException(exception,GetMagickModule(),
ResourceLimitError,"MemoryAllocationFailed","`%s'",p->name);
continue;
}
(void) ResetMagickMemory(magic_info,0,sizeof(*magic_info));
magic_info->path=(char *) "[built-in]";
magic_info->name=(char *) p->name;
magic_info->offset=p->offset;
magic_info->target=(char *) p->magic;
magic_info->magic=(unsigned char *) p->magic;
magic_info->length=p->length;
magic_info->exempt=MagickTrue;
magic_info->signature=MagickCoreSignature;
status&=InsertValueInSortedLinkedList(magic_cache,CompareMagickInfoSize,
NULL,magic_info);
if (status == MagickFalse)
(void) ThrowMagickException(exception,GetMagickModule(),
ResourceLimitError,"MemoryAllocationFailed","`%s'",magic_info->name);
}
return(magic_cache);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t M a g i c I n f o %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetMagicInfo() searches the magic list for the specified name and if found
% returns attributes for that magic.
%
% The format of the GetMagicInfo method is:
%
% const MagicInfo *GetMagicInfo(const unsigned char *magic,
% const size_t length,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o magic: A binary string generally representing the first few characters
% of the image file or blob.
%
% o length: the length of the binary signature.
%
% o exception: return any errors or warnings in this structure.
%
*/
MagickExport const MagicInfo *GetMagicInfo(const unsigned char *magic,
const size_t length,ExceptionInfo *exception)
{
register const MagicInfo
*p;
assert(exception != (ExceptionInfo *) NULL);
if (IsMagicCacheInstantiated(exception) == MagickFalse)
return((const MagicInfo *) NULL);
/*
Search for magic tag.
*/
LockSemaphoreInfo(magic_semaphore);
ResetLinkedListIterator(magic_cache);
p=(const MagicInfo *) GetNextValueInLinkedList(magic_cache);
if (magic == (const unsigned char *) NULL)
{
UnlockSemaphoreInfo(magic_semaphore);
return(p);
}
while (p != (const MagicInfo *) NULL)
{
assert(p->offset >= 0);
if (((size_t) (p->offset+p->length) <= length) &&
(memcmp(magic+p->offset,p->magic,p->length) == 0))
break;
p=(const MagicInfo *) GetNextValueInLinkedList(magic_cache);
}
if (p != (const MagicInfo *) NULL)
(void) InsertValueInLinkedList(magic_cache,0,
RemoveElementByValueFromLinkedList(magic_cache,p));
UnlockSemaphoreInfo(magic_semaphore);
return(p);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t M a g i c P a t t e r n E x t e n t %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetMagicPatternExtent() returns the the extent of the buffer that is
% required to check all the MagickInfos. It returns zero if the list is empty.
%
% The format of the GetMagicPatternExtent method is:
%
% size_t GetMagicPatternExtent(ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o exception: return any errors or warnings in this structure.
%
*/
MagickExport size_t GetMagicPatternExtent(ExceptionInfo *exception)
{
register const MagicInfo
*p;
size_t
magickSize,
max;
static size_t
size=0;
assert(exception != (ExceptionInfo *) NULL);
if ((size != 0) || (IsMagicCacheInstantiated(exception) == MagickFalse))
return(size);
LockSemaphoreInfo(magic_semaphore);
ResetLinkedListIterator(magic_cache);
max=0;
p=(const MagicInfo *) GetNextValueInLinkedList(magic_cache);
while (p != (const MagicInfo *) NULL)
{
magickSize=(size_t) (p->offset+p->length);
if (magickSize > max)
max=magickSize;
p=(const MagicInfo *) GetNextValueInLinkedList(magic_cache);
}
size=max;
UnlockSemaphoreInfo(magic_semaphore);
return(size);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t M a g i c I n f o L i s t %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetMagicInfoList() returns any image aliases that match the specified
% pattern.
%
% The magic of the GetMagicInfoList function is:
%
% const MagicInfo **GetMagicInfoList(const char *pattern,
% size_t *number_aliases,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o pattern: Specifies a pointer to a text string containing a pattern.
%
% o number_aliases: This integer returns the number of aliases in the list.
%
% o exception: return any errors or warnings in this structure.
%
*/
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
static int MagicInfoCompare(const void *x,const void *y)
{
const MagicInfo
**p,
**q;
p=(const MagicInfo **) x,
q=(const MagicInfo **) y;
if (LocaleCompare((*p)->path,(*q)->path) == 0)
return(LocaleCompare((*p)->name,(*q)->name));
return(LocaleCompare((*p)->path,(*q)->path));
}
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
MagickExport const MagicInfo **GetMagicInfoList(const char *pattern,
size_t *number_aliases,ExceptionInfo *exception)
{
const MagicInfo
**aliases;
register const MagicInfo
*p;
register ssize_t
i;
/*
Allocate magic list.
*/
assert(pattern != (char *) NULL);
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",pattern);
assert(number_aliases != (size_t *) NULL);
*number_aliases=0;
p=GetMagicInfo((const unsigned char *) NULL,0,exception);
if (p == (const MagicInfo *) NULL)
return((const MagicInfo **) NULL);
aliases=(const MagicInfo **) AcquireQuantumMemory((size_t)
GetNumberOfElementsInLinkedList(magic_cache)+1UL,sizeof(*aliases));
if (aliases == (const MagicInfo **) NULL)
return((const MagicInfo **) NULL);
/*
Generate magic list.
*/
LockSemaphoreInfo(magic_semaphore);
ResetLinkedListIterator(magic_cache);
p=(const MagicInfo *) GetNextValueInLinkedList(magic_cache);
for (i=0; p != (const MagicInfo *) NULL; )
{
if ((p->stealth == MagickFalse) &&
(GlobExpression(p->name,pattern,MagickFalse) != MagickFalse))
aliases[i++]=p;
p=(const MagicInfo *) GetNextValueInLinkedList(magic_cache);
}
UnlockSemaphoreInfo(magic_semaphore);
qsort((void *) aliases,(size_t) i,sizeof(*aliases),MagicInfoCompare);
aliases[i]=(MagicInfo *) NULL;
*number_aliases=(size_t) i;
return(aliases);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t M a g i c L i s t %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetMagicList() returns any image format aliases that match the specified
% pattern.
%
% The format of the GetMagicList function is:
%
% char **GetMagicList(const char *pattern,size_t *number_aliases,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o pattern: Specifies a pointer to a text string containing a pattern.
%
% o number_aliases: This integer returns the number of image format aliases
% in the list.
%
% o exception: return any errors or warnings in this structure.
%
*/
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
static int MagicCompare(const void *x,const void *y)
{
register 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 **GetMagicList(const char *pattern,size_t *number_aliases,
ExceptionInfo *exception)
{
char
**aliases;
register const MagicInfo
*p;
register ssize_t
i;
/*
Allocate configure list.
*/
assert(pattern != (char *) NULL);
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",pattern);
assert(number_aliases != (size_t *) NULL);
*number_aliases=0;
p=GetMagicInfo((const unsigned char *) NULL,0,exception);
if (p == (const MagicInfo *) NULL)
return((char **) NULL);
aliases=(char **) AcquireQuantumMemory((size_t)
GetNumberOfElementsInLinkedList(magic_cache)+1UL,sizeof(*aliases));
if (aliases == (char **) NULL)
return((char **) NULL);
LockSemaphoreInfo(magic_semaphore);
ResetLinkedListIterator(magic_cache);
p=(const MagicInfo *) GetNextValueInLinkedList(magic_cache);
for (i=0; p != (const MagicInfo *) NULL; )
{
if ((p->stealth == MagickFalse) &&
(GlobExpression(p->name,pattern,MagickFalse) != MagickFalse))
aliases[i++]=ConstantString(p->name);
p=(const MagicInfo *) GetNextValueInLinkedList(magic_cache);
}
UnlockSemaphoreInfo(magic_semaphore);
qsort((void *) aliases,(size_t) i,sizeof(*aliases),MagicCompare);
aliases[i]=(char *) NULL;
*number_aliases=(size_t) i;
return(aliases);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t M a g i c N a m e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetMagicName() returns the name associated with the magic.
%
% The format of the GetMagicName method is:
%
% const char *GetMagicName(const MagicInfo *magic_info)
%
% A description of each parameter follows:
%
% o magic_info: The magic info.
%
*/
MagickExport const char *GetMagicName(const MagicInfo *magic_info)
{
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
assert(magic_info != (MagicInfo *) NULL);
assert(magic_info->signature == MagickCoreSignature);
return(magic_info->name);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ I s M a g i c C a c h e I n s t a n t i a t e d %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% IsMagicCacheInstantiated() determines if the magic list is instantiated.
% If not, it instantiates the list and returns it.
%
% The format of the IsMagicInstantiated method is:
%
% MagickBooleanType IsMagicCacheInstantiated(ExceptionInfo *exception)
%
% A description of each parameter follows.
%
% o exception: return any errors or warnings in this structure.
%
*/
static MagickBooleanType IsMagicCacheInstantiated(ExceptionInfo *exception)
{
if (magic_cache == (LinkedListInfo *) NULL)
{
if (magic_semaphore == (SemaphoreInfo *) NULL)
ActivateSemaphoreInfo(&magic_semaphore);
LockSemaphoreInfo(magic_semaphore);
if (magic_cache == (LinkedListInfo *) NULL)
magic_cache=AcquireMagicCache(MagicFilename,exception);
UnlockSemaphoreInfo(magic_semaphore);
}
return(magic_cache != (LinkedListInfo *) NULL ? MagickTrue : MagickFalse);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% L i s t M a g i c I n f o %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ListMagicInfo() lists the magic info to a file.
%
% The format of the ListMagicInfo method is:
%
% MagickBooleanType ListMagicInfo(FILE *file,ExceptionInfo *exception)
%
% A description of each parameter follows.
%
% o file: An pointer to a FILE.
%
% o exception: return any errors or warnings in this structure.
%
*/
MagickExport MagickBooleanType ListMagicInfo(FILE *file,
ExceptionInfo *exception)
{
const char
*path;
const MagicInfo
**magic_info;
register ssize_t
i;
size_t
number_aliases;
ssize_t
j;
if (file == (const FILE *) NULL)
file=stdout;
magic_info=GetMagicInfoList("*",&number_aliases,exception);
if (magic_info == (const MagicInfo **) NULL)
return(MagickFalse);
j=0;
path=(const char *) NULL;
for (i=0; i < (ssize_t) number_aliases; i++)
{
if (magic_info[i]->stealth != MagickFalse)
continue;
if ((path == (const char *) NULL) ||
(LocaleCompare(path,magic_info[i]->path) != 0))
{
if (magic_info[i]->path != (char *) NULL)
(void) FormatLocaleFile(file,"\nPath: %s\n\n",magic_info[i]->path);
(void) FormatLocaleFile(file,"Name Offset Target\n");
(void) FormatLocaleFile(file,
"-------------------------------------------------"
"------------------------------\n");
}
path=magic_info[i]->path;
(void) FormatLocaleFile(file,"%s",magic_info[i]->name);
for (j=(ssize_t) strlen(magic_info[i]->name); j <= 9; j++)
(void) FormatLocaleFile(file," ");
(void) FormatLocaleFile(file,"%6ld ",(long) magic_info[i]->offset);
if (magic_info[i]->target != (char *) NULL)
{
register ssize_t
j;
for (j=0; magic_info[i]->target[j] != '\0'; j++)
if (isprint((int) ((unsigned char) magic_info[i]->target[j])) != 0)
(void) FormatLocaleFile(file,"%c",magic_info[i]->target[j]);
else
(void) FormatLocaleFile(file,"\\%03o",(unsigned int)
((unsigned char) magic_info[i]->target[j]));
}
(void) FormatLocaleFile(file,"\n");
}
(void) fflush(file);
magic_info=(const MagicInfo **) RelinquishMagickMemory((void *) magic_info);
return(MagickTrue);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ L o a d M a g i c C a c h e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% LoadMagicCache() loads the magic configurations which provides a mapping
% between magic attributes and a magic name.
%
% The format of the LoadMagicCache method is:
%
% MagickBooleanType LoadMagicCache(LinkedListInfo *magic_cache,
% const char *xml,const char *filename,const size_t depth,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o xml: The magic list in XML format.
%
% o filename: The magic list filename.
%
% o depth: depth of <include /> statements.
%
% o exception: return any errors or warnings in this structure.
%
*/
static MagickBooleanType LoadMagicCache(LinkedListInfo *magic_cache,
const char *xml,const char *filename,const size_t depth,
ExceptionInfo *exception)
{
char
keyword[MagickPathExtent],
*token;
const char
*q;
MagicInfo
*magic_info;
MagickStatusType
status;
size_t
extent;
/*
Load the magic map file.
*/
(void) LogMagickEvent(ConfigureEvent,GetMagickModule(),
"Loading magic configure file \"%s\" ...",filename);
if (xml == (char *) NULL)
return(MagickFalse);
status=MagickTrue;
magic_info=(MagicInfo *) NULL;
token=AcquireString(xml);
extent=strlen(token)+MagickPathExtent;
for (q=(char *) xml; *q != '\0'; )
{
/*
Interpret XML.
*/
GetNextToken(q,&q,extent,token);
if (*token == '\0')
break;
(void) CopyMagickString(keyword,token,MagickPathExtent);
if (LocaleNCompare(keyword,"<!DOCTYPE",9) == 0)
{
/*
Doctype element.
*/
while ((LocaleNCompare(q,"]>",2) != 0) && (*q != '\0'))
GetNextToken(q,&q,extent,token);
continue;
}
if (LocaleNCompare(keyword,"<!--",4) == 0)
{
/*
Comment element.
*/
while ((LocaleNCompare(q,"->",2) != 0) && (*q != '\0'))
GetNextToken(q,&q,extent,token);
continue;
}
if (LocaleCompare(keyword,"<include") == 0)
{
/*
Include element.
*/
while (((*token != '/') && (*(token+1) != '>')) && (*q != '\0'))
{
(void) CopyMagickString(keyword,token,MagickPathExtent);
GetNextToken(q,&q,extent,token);
if (*token != '=')
continue;
GetNextToken(q,&q,extent,token);
if (LocaleCompare(keyword,"file") == 0)
{
if (depth > 200)
(void) ThrowMagickException(exception,GetMagickModule(),
ConfigureError,"IncludeElementNestedTooDeeply","`%s'",token);
else
{
char
path[MagickPathExtent],
*file_xml;
GetPathComponent(filename,HeadPath,path);
if (*path != '\0')
(void) ConcatenateMagickString(path,DirectorySeparator,
MagickPathExtent);
if (*token == *DirectorySeparator)
(void) CopyMagickString(path,token,MagickPathExtent);
else
(void) ConcatenateMagickString(path,token,MagickPathExtent);
file_xml=FileToXML(path,~0UL);
if (xml != (char *) NULL)
{
status&=LoadMagicCache(magic_cache,file_xml,path,depth+1,
exception);
file_xml=DestroyString(file_xml);
}
}
}
}
continue;
}
if (LocaleCompare(keyword,"<magic") == 0)
{
/*
Magic element.
*/
magic_info=(MagicInfo *) AcquireMagickMemory(sizeof(*magic_info));
if (magic_info == (MagicInfo *) NULL)
ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
(void) ResetMagickMemory(magic_info,0,sizeof(*magic_info));
magic_info->path=ConstantString(filename);
magic_info->exempt=MagickFalse;
magic_info->signature=MagickCoreSignature;
continue;
}
if (magic_info == (MagicInfo *) NULL)
continue;
if (LocaleCompare(keyword,"/>") == 0)
{
status=InsertValueInSortedLinkedList(magic_cache,CompareMagickInfoSize,
NULL,magic_info);
if (status == MagickFalse)
(void) ThrowMagickException(exception,GetMagickModule(),
ResourceLimitError,"MemoryAllocationFailed","`%s'",
magic_info->name);
magic_info=(MagicInfo *) NULL;
continue;
}
GetNextToken(q,(const char **) NULL,extent,token);
if (*token != '=')
continue;
GetNextToken(q,&q,extent,token);
GetNextToken(q,&q,extent,token);
switch (*keyword)
{
case 'N':
case 'n':
{
if (LocaleCompare((char *) keyword,"name") == 0)
{
magic_info->name=ConstantString(token);
break;
}
break;
}
case 'O':
case 'o':
{
if (LocaleCompare((char *) keyword,"offset") == 0)
{
magic_info->offset=(MagickOffsetType) StringToLong(token);
break;
}
break;
}
case 'S':
case 's':
{
if (LocaleCompare((char *) keyword,"stealth") == 0)
{
magic_info->stealth=IsStringTrue(token);
break;
}
break;
}
case 'T':
case 't':
{
if (LocaleCompare((char *) keyword,"target") == 0)
{
char
*p;
register unsigned char