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blob.c
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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% BBBB L OOO BBBB %
% B B L O O B B %
% BBBB L O O BBBB %
% B B L O O B B %
% BBBB LLLLL OOO BBBB %
% %
% %
% MagickCore Binary Large OBjectS Methods %
% %
% Software Design %
% Cristy %
% July 1999 %
% %
% %
% Copyright 1999 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.
*/
#ifdef __VMS
#include <types.h>
#include <mman.h>
#endif
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/cache.h"
#include "magick/client.h"
#include "magick/constitute.h"
#include "magick/delegate.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/locale_.h"
#include "magick/log.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/nt-base-private.h"
#include "magick/option.h"
#include "magick/policy.h"
#include "magick/resource_.h"
#include "magick/semaphore.h"
#include "magick/string_.h"
#include "magick/string-private.h"
#include "magick/timer-private.h"
#include "magick/token.h"
#include "magick/utility.h"
#include "magick/utility-private.h"
#if defined(MAGICKCORE_ZLIB_DELEGATE)
#include "zlib.h"
#endif
#if defined(MAGICKCORE_BZLIB_DELEGATE)
#include "bzlib.h"
#endif
/*
Define declarations.
*/
#define MagickMaxBlobExtent (8*8192)
#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
# define MAP_ANONYMOUS MAP_ANON
#endif
#if !defined(MAP_FAILED)
#define MAP_FAILED ((void *) -1)
#endif
#if defined(__OS2__)
#include <io.h>
#define _O_BINARY O_BINARY
#endif
/*
Typedef declarations.
*/
typedef union FileInfo
{
FILE
*file;
#if defined(MAGICKCORE_ZLIB_DELEGATE)
gzFile
gzfile;
#endif
#if defined(MAGICKCORE_BZLIB_DELEGATE)
BZFILE
*bzfile;
#endif
} FileInfo;
struct _BlobInfo
{
size_t
length,
extent,
quantum;
BlobMode
mode;
MagickBooleanType
mapped,
eof;
int
error,
error_number;
MagickOffsetType
offset;
MagickSizeType
size;
MagickBooleanType
exempt,
synchronize,
temporary;
int
status;
StreamType
type;
FileInfo
file_info;
struct stat
properties;
StreamHandler
stream;
unsigned char
*data;
MagickBooleanType
debug;
SemaphoreInfo
*semaphore;
ssize_t
reference_count;
size_t
signature;
};
/*
Forward declarations.
*/
static int
SyncBlob(const Image *);
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ A t t a c h B l o b %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% AttachBlob() attaches a blob to the BlobInfo structure.
%
% The format of the AttachBlob method is:
%
% void AttachBlob(BlobInfo *blob_info,const void *blob,const size_t length)
%
% A description of each parameter follows:
%
% o blob_info: Specifies a pointer to a BlobInfo structure.
%
% o blob: the address of a character stream in one of the image formats
% understood by ImageMagick.
%
% o length: This size_t integer reflects the length in bytes of the blob.
%
*/
MagickExport void AttachBlob(BlobInfo *blob_info,const void *blob,
const size_t length)
{
assert(blob_info != (BlobInfo *) NULL);
if (IsEventLogging() != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
blob_info->length=length;
blob_info->extent=length;
blob_info->quantum=(size_t) MagickMaxBlobExtent;
blob_info->offset=0;
blob_info->type=BlobStream;
blob_info->file_info.file=(FILE *) NULL;
blob_info->data=(unsigned char *) blob;
blob_info->mapped=MagickFalse;
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ B l o b T o F i l e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% BlobToFile() writes a blob to a file. It returns MagickFalse if an error
% occurs otherwise MagickTrue.
%
% The format of the BlobToFile method is:
%
% MagickBooleanType BlobToFile(char *filename,const void *blob,
% const size_t length,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o filename: Write the blob to this file.
%
% o blob: the address of a blob.
%
% o length: This length in bytes of the blob.
%
% o exception: return any errors or warnings in this structure.
%
*/
MagickExport MagickBooleanType BlobToFile(char *filename,const void *blob,
const size_t length,ExceptionInfo *exception)
{
int
file;
size_t
i;
ssize_t
count;
assert(filename != (const char *) NULL);
assert(blob != (const void *) NULL);
if (IsEventLogging() != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",filename);
if (*filename == '\0')
file=AcquireUniqueFileResource(filename);
else
file=open_utf8(filename,O_RDWR | O_CREAT | O_EXCL | O_BINARY,S_MODE);
if (file == -1)
{
ThrowFileException(exception,BlobError,"UnableToWriteBlob",filename);
return(MagickFalse);
}
for (i=0; i < length; i+=(size_t) count)
{
count=write(file,(const char *) blob+i,MagickMin(length-i,(size_t)
MagickMaxBufferExtent));
if (count <= 0)
{
count=0;
if (errno != EINTR)
break;
}
}
file=close(file);
if ((file == -1) || (i < length))
{
ThrowFileException(exception,BlobError,"UnableToWriteBlob",filename);
return(MagickFalse);
}
return(MagickTrue);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% B l o b T o I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% BlobToImage() implements direct to memory image formats. It returns the
% blob as an image.
%
% The format of the BlobToImage method is:
%
% Image *BlobToImage(const ImageInfo *image_info,const void *blob,
% const size_t length,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image_info: the image info.
%
% o blob: the address of a character stream in one of the image formats
% understood by ImageMagick.
%
% o length: This size_t integer reflects the length in bytes of the blob.
%
% o exception: return any errors or warnings in this structure.
%
*/
MagickExport Image *BlobToImage(const ImageInfo *image_info,const void *blob,
const size_t length,ExceptionInfo *exception)
{
const MagickInfo
*magick_info;
Image
*image;
ImageInfo
*blob_info,
*clone_info;
MagickBooleanType
status;
assert(image_info != (ImageInfo *) NULL);
assert(image_info->signature == MagickCoreSignature);
assert(exception != (ExceptionInfo *) NULL);
if (IsEventLogging() != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
image_info->filename);
if ((blob == (const void *) NULL) || (length == 0))
{
(void) ThrowMagickException(exception,GetMagickModule(),BlobError,
"ZeroLengthBlobNotPermitted","`%s'",image_info->filename);
return((Image *) NULL);
}
blob_info=CloneImageInfo(image_info);
blob_info->blob=(void *) blob;
blob_info->length=length;
if (*blob_info->magick == '\0')
(void) SetImageInfo(blob_info,0,exception);
magick_info=GetMagickInfo(blob_info->magick,exception);
if (magick_info == (const MagickInfo *) NULL)
{
(void) ThrowMagickException(exception,GetMagickModule(),
MissingDelegateError,"NoDecodeDelegateForThisImageFormat","`%s'",
blob_info->magick);
blob_info=DestroyImageInfo(blob_info);
return((Image *) NULL);
}
if (GetMagickBlobSupport(magick_info) != MagickFalse)
{
char
filename[MagickPathExtent];
/*
Native blob support for this image format.
*/
(void) CopyMagickString(filename,blob_info->filename,MagickPathExtent);
(void) FormatLocaleString(blob_info->filename,MagickPathExtent,"%s:%s",
blob_info->magick,filename);
image=ReadImage(blob_info,exception);
if (image != (Image *) NULL)
(void) DetachBlob(image->blob);
blob_info=DestroyImageInfo(blob_info);
return(image);
}
/*
Write blob to a temporary file on disk.
*/
blob_info->blob=(void *) NULL;
blob_info->length=0;
*blob_info->filename='\0';
status=BlobToFile(blob_info->filename,blob,length,exception);
if (status == MagickFalse)
{
(void) RelinquishUniqueFileResource(blob_info->filename);
blob_info=DestroyImageInfo(blob_info);
return((Image *) NULL);
}
clone_info=CloneImageInfo(blob_info);
(void) FormatLocaleString(clone_info->filename,MagickPathExtent,"%s:%s",
blob_info->magick,blob_info->filename);
image=ReadImage(clone_info,exception);
if (image != (Image *) NULL)
{
Image
*images;
/*
Restore original filenames and image format.
*/
for (images=GetFirstImageInList(image); images != (Image *) NULL; )
{
(void) CopyMagickString(images->filename,image_info->filename,
MagickPathExtent);
(void) CopyMagickString(images->magick_filename,image_info->filename,
MagickPathExtent);
(void) CopyMagickString(images->magick,magick_info->name,
MagickPathExtent);
images=GetNextImageInList(images);
}
}
clone_info=DestroyImageInfo(clone_info);
(void) RelinquishUniqueFileResource(blob_info->filename);
blob_info=DestroyImageInfo(blob_info);
return(image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ C l o n e B l o b I n f o %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% CloneBlobInfo() makes a duplicate of the given blob info structure, or if
% blob info is NULL, a new one.
%
% The format of the CloneBlobInfo method is:
%
% BlobInfo *CloneBlobInfo(const BlobInfo *blob_info)
%
% A description of each parameter follows:
%
% o blob_info: the blob info.
%
*/
MagickExport BlobInfo *CloneBlobInfo(const BlobInfo *blob_info)
{
BlobInfo
*clone_info;
SemaphoreInfo
*semaphore;
clone_info=(BlobInfo *) AcquireCriticalMemory(sizeof(*clone_info));
GetBlobInfo(clone_info);
if (blob_info == (BlobInfo *) NULL)
return(clone_info);
semaphore=clone_info->semaphore;
(void) memcpy(clone_info,blob_info,sizeof(*clone_info));
if (blob_info->mapped != MagickFalse)
(void) AcquireMagickResource(MapResource,blob_info->length);
clone_info->semaphore=semaphore;
LockSemaphoreInfo(clone_info->semaphore);
clone_info->reference_count=1;
UnlockSemaphoreInfo(clone_info->semaphore);
return(clone_info);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ C l o s e B l o b %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% CloseBlob() closes a stream associated with the image.
%
% The format of the CloseBlob method is:
%
% MagickBooleanType CloseBlob(Image *image)
%
% A description of each parameter follows:
%
% o image: the image.
%
*/
static inline void ThrowBlobException(BlobInfo *blob_info)
{
if ((blob_info->status == 0) && (errno != 0))
blob_info->error_number=errno;
blob_info->status=(-1);
}
MagickExport MagickBooleanType CloseBlob(Image *image)
{
BlobInfo
*magick_restrict blob_info;
int
status;
/*
Close image file.
*/
assert(image != (Image *) NULL);
assert(image->signature == MagickCoreSignature);
if (IsEventLogging() != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
blob_info=image->blob;
if ((blob_info == (BlobInfo *) NULL) || (blob_info->type == UndefinedStream))
return(MagickTrue);
(void) SyncBlob(image);
status=blob_info->status;
switch (blob_info->type)
{
case UndefinedStream:
break;
case StandardStream:
case FileStream:
case PipeStream:
{
if (blob_info->synchronize != MagickFalse)
{
status=fflush(blob_info->file_info.file);
if (status != 0)
ThrowBlobException(blob_info);
status=fsync(fileno(blob_info->file_info.file));
if (status != 0)
ThrowBlobException(blob_info);
}
if ((status != 0) && (ferror(blob_info->file_info.file) != 0))
ThrowBlobException(blob_info);
break;
}
case ZipStream:
{
#if defined(MAGICKCORE_ZLIB_DELEGATE)
status=Z_OK;
(void) gzerror(blob_info->file_info.gzfile,&status);
if (status != Z_OK)
ThrowBlobException(blob_info);
#endif
break;
}
case BZipStream:
{
#if defined(MAGICKCORE_BZLIB_DELEGATE)
status=BZ_OK;
(void) BZ2_bzerror(blob_info->file_info.bzfile,&status);
if (status != BZ_OK)
ThrowBlobException(blob_info);
#endif
break;
}
case FifoStream:
break;
case BlobStream:
{
if (blob_info->file_info.file != (FILE *) NULL)
{
if (blob_info->synchronize != MagickFalse)
{
status=fflush(blob_info->file_info.file);
if (status != 0)
ThrowBlobException(blob_info);
status=fsync(fileno(blob_info->file_info.file));
if (status != 0)
ThrowBlobException(blob_info);
}
if ((status != 0) && (ferror(blob_info->file_info.file) != 0))
ThrowBlobException(blob_info);
}
break;
}
}
blob_info->size=GetBlobSize(image);
image->extent=blob_info->size;
blob_info->eof=MagickFalse;
blob_info->error=0;
blob_info->mode=UndefinedBlobMode;
if (blob_info->exempt != MagickFalse)
{
blob_info->type=UndefinedStream;
return(blob_info->status != 0 ? MagickFalse : MagickTrue);
}
switch (blob_info->type)
{
case UndefinedStream:
case StandardStream:
break;
case FileStream:
{
if (blob_info->file_info.file != (FILE *) NULL)
{
status=fclose(blob_info->file_info.file);
if (status != 0)
ThrowBlobException(blob_info);
}
break;
}
case PipeStream:
{
#if defined(MAGICKCORE_HAVE_PCLOSE)
status=pclose(blob_info->file_info.file);
if (status != 0)
ThrowBlobException(blob_info);
#endif
break;
}
case ZipStream:
{
#if defined(MAGICKCORE_ZLIB_DELEGATE)
status=gzclose(blob_info->file_info.gzfile);
if (status != Z_OK)
ThrowBlobException(blob_info);
#endif
break;
}
case BZipStream:
{
#if defined(MAGICKCORE_BZLIB_DELEGATE)
BZ2_bzclose(blob_info->file_info.bzfile);
#endif
break;
}
case FifoStream:
break;
case BlobStream:
{
if (blob_info->file_info.file != (FILE *) NULL)
{
status=fclose(blob_info->file_info.file);
if (status != 0)
ThrowBlobException(blob_info);
}
break;
}
}
(void) DetachBlob(blob_info);
return(blob_info->status != 0 ? MagickFalse : MagickTrue);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D e s t r o y B l o b %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DestroyBlob() deallocates memory associated with a blob.
%
% The format of the DestroyBlob method is:
%
% void DestroyBlob(Image *image)
%
% A description of each parameter follows:
%
% o image: the image.
%
*/
MagickExport void DestroyBlob(Image *image)
{
BlobInfo
*magick_restrict blob_info;
MagickBooleanType
destroy;
assert(image != (Image *) NULL);
assert(image->signature == MagickCoreSignature);
assert(image->blob != (BlobInfo *) NULL);
assert(image->blob->signature == MagickCoreSignature);
if (IsEventLogging() != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
blob_info=image->blob;
destroy=MagickFalse;
LockSemaphoreInfo(blob_info->semaphore);
blob_info->reference_count--;
assert(blob_info->reference_count >= 0);
if (blob_info->reference_count == 0)
destroy=MagickTrue;
UnlockSemaphoreInfo(blob_info->semaphore);
if (destroy == MagickFalse)
{
image->blob=(BlobInfo *) NULL;
return;
}
(void) CloseBlob(image);
if (blob_info->mapped != MagickFalse)
{
(void) UnmapBlob(blob_info->data,blob_info->length);
RelinquishMagickResource(MapResource,blob_info->length);
}
if (blob_info->semaphore != (SemaphoreInfo *) NULL)
DestroySemaphoreInfo(&blob_info->semaphore);
blob_info->signature=(~MagickCoreSignature);
image->blob=(BlobInfo *) RelinquishMagickMemory(blob_info);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D e t a c h B l o b %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DetachBlob() detaches a blob from the BlobInfo structure.
%
% The format of the DetachBlob method is:
%
% unsigned char *DetachBlob(BlobInfo *blob_info)
%
% A description of each parameter follows:
%
% o blob_info: Specifies a pointer to a BlobInfo structure.
%
*/
MagickExport unsigned char *DetachBlob(BlobInfo *blob_info)
{
unsigned char
*data;
assert(blob_info != (BlobInfo *) NULL);
if (IsEventLogging() != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
if (blob_info->mapped != MagickFalse)
{
(void) UnmapBlob(blob_info->data,blob_info->length);
blob_info->data=NULL;
RelinquishMagickResource(MapResource,blob_info->length);
}
blob_info->mapped=MagickFalse;
blob_info->length=0;
blob_info->offset=0;
blob_info->mode=UndefinedBlobMode;
blob_info->eof=MagickFalse;
blob_info->error=0;
blob_info->exempt=MagickFalse;
blob_info->type=UndefinedStream;
blob_info->file_info.file=(FILE *) NULL;
data=blob_info->data;
blob_info->data=(unsigned char *) NULL;
blob_info->stream=(StreamHandler) NULL;
return(data);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D i s a s s o c i a t e B l o b %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DisassociateBlob() disassociates the image stream. It checks if the
% blob of the specified image is referenced by other images. If the reference
% count is higher then 1 a new blob is assigned to the specified image.
%
% The format of the DisassociateBlob method is:
%
% void DisassociateBlob(const Image *image)
%
% A description of each parameter follows:
%
% o image: the image.
%
*/
MagickPrivate void DisassociateBlob(Image *image)
{
BlobInfo
*magick_restrict blob_info,
*clone_info;
MagickBooleanType
clone;
assert(image != (Image *) NULL);
assert(image->signature == MagickCoreSignature);
assert(image->blob != (BlobInfo *) NULL);
assert(image->blob->signature == MagickCoreSignature);
if (IsEventLogging() != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
blob_info=image->blob;
clone=MagickFalse;
LockSemaphoreInfo(blob_info->semaphore);
assert(blob_info->reference_count >= 0);
if (blob_info->reference_count > 1)
clone=MagickTrue;
UnlockSemaphoreInfo(blob_info->semaphore);
if (clone == MagickFalse)
return;
clone_info=CloneBlobInfo(blob_info);
DestroyBlob(image);
image->blob=clone_info;
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D i s c a r d B l o b B y t e s %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DiscardBlobBytes() discards bytes in a blob.
%
% The format of the DiscardBlobBytes method is:
%
% MagickBooleanType DiscardBlobBytes(Image *image,
% const MagickSizeType length)
%
% A description of each parameter follows.
%
% o image: the image.
%
% o length: the number of bytes to skip.
%
*/
MagickExport MagickBooleanType DiscardBlobBytes(Image *image,
const MagickSizeType length)
{
MagickSizeType
i;
size_t
quantum;
ssize_t
count;
unsigned char
buffer[MagickMinBufferExtent >> 1];
assert(image != (Image *) NULL);
assert(image->signature == MagickCoreSignature);
if (length != (MagickSizeType) ((MagickOffsetType) length))
return(MagickFalse);
count=0;
for (i=0; i < length; i+=(MagickSizeType) count)
{
quantum=(size_t) MagickMin(length-i,sizeof(buffer));
(void) ReadBlobStream(image,quantum,buffer,&count);
if (count <= 0)
{
count=0;
if (errno != EINTR)
break;
}
}
return(i < (MagickSizeType) length ? MagickFalse : MagickTrue);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D u p l i c a t e s B l o b %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DuplicateBlob() duplicates a blob descriptor.
%
% The format of the DuplicateBlob method is:
%
% void DuplicateBlob(Image *image,const Image *duplicate)
%
% A description of each parameter follows:
%
% o image: the image.
%
% o duplicate: the duplicate image.
%
*/
MagickExport void DuplicateBlob(Image *image,const Image *duplicate)
{
assert(image != (Image *) NULL);
assert(image->signature == MagickCoreSignature);
assert(duplicate != (Image *) NULL);
assert(duplicate->signature == MagickCoreSignature);
if (IsEventLogging() != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
DestroyBlob(image);
image->blob=ReferenceBlob(duplicate->blob);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ E O F B l o b %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% EOFBlob() returns a non-zero value when EOF has been detected reading from
% a blob or file.
%
% The format of the EOFBlob method is:
%
% int EOFBlob(const Image *image)
%
% A description of each parameter follows:
%
% o image: the image.
%
*/
MagickExport int EOFBlob(const Image *image)
{
BlobInfo
*magick_restrict blob_info;
assert(image != (Image *) NULL);
assert(image->signature == MagickCoreSignature);
assert(image->blob != (BlobInfo *) NULL);
assert(image->blob->type != UndefinedStream);
if (IsEventLogging() != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
blob_info=image->blob;
switch (blob_info->type)
{
case UndefinedStream:
case StandardStream:
break;
case FileStream:
case PipeStream:
{
blob_info->eof=feof(blob_info->file_info.file) != 0 ? MagickTrue :
MagickFalse;
break;
}
case ZipStream:
{
#if defined(MAGICKCORE_ZLIB_DELEGATE)
blob_info->eof=gzeof(blob_info->file_info.gzfile) != 0 ? MagickTrue :
MagickFalse;
#endif
break;
}
case BZipStream:
{
#if defined(MAGICKCORE_BZLIB_DELEGATE)
int
status;
status=0;
(void) BZ2_bzerror(blob_info->file_info.bzfile,&status);
blob_info->eof=status == BZ_UNEXPECTED_EOF ? MagickTrue : MagickFalse;
#endif
break;
}
case FifoStream:
{
blob_info->eof=MagickFalse;
break;
}
case BlobStream:
break;
}
return((int) blob_info->eof);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ E r r o r B l o b %
% %