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/*
This file is part of libextractor.
(C) 2002, 2003, 2009 Vidyut Samanta and Christian Grothoff
libextractor is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, or (at your
option) any later version.
libextractor is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with libextractor; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include "platform.h"
#include "extractor.h"
static char *
readline (const char *data, size_t size, size_t pos)
{
size_t end;
char *res;
while ((pos < size) &&
((data[pos] == (char) 0x0d) || (data[pos] == (char) 0x0a)))
pos++;
if (pos >= size)
return NULL; /* end of file */
end = pos;
while ((end < size) &&
(data[end] != (char) 0x0d) && (data[end] != (char) 0x0a))
end++;
res = malloc (end - pos + 1);
memcpy (res, &data[pos], end - pos);
res[end - pos] = '\0';
return res;
}
static int
testmeta (char *line,
const char *match,
enum EXTRACTOR_MetaType type,
EXTRACTOR_MetaDataProcessor proc,
void *proc_cls)
{
char *key;
if ( (strncmp (line, match, strlen (match)) == 0) &&
(strlen (line) > strlen (match)) )
{
if ((line[strlen (line) - 1] == ')') && (line[strlen (match)] == '('))
{
key = &line[strlen (match) + 1];
key[strlen (key) - 1] = '\0'; /* remove ")" */
}
else
{
key = &line[strlen (match)];
}
if (0 != proc (proc_cls,
"ps",
type,
EXTRACTOR_METAFORMAT_UTF8,
"text/plain",
key,
strlen (key)+1))
return 1;
}
return 0;
}
typedef struct
{
const char *prefix;
enum EXTRACTOR_MetaType type;
} Matches;
static Matches tests[] = {
{"%%Title: ", EXTRACTOR_METATYPE_TITLE},
{"%%Author: ", EXTRACTOR_METATYPE_AUTHOR_NAME},
{"%%Version: ", EXTRACTOR_METATYPE_REVISION_NUMBER},
{"%%Creator: ", EXTRACTOR_METATYPE_CREATED_BY_SOFTWARE},
{"%%CreationDate: ", EXTRACTOR_METATYPE_CREATION_DATE},
{"%%Pages: ", EXTRACTOR_METATYPE_PAGE_COUNT},
{"%%Orientation: ", EXTRACTOR_METATYPE_PAGE_ORIENTATION},
{"%%DocumentPaperSizes: ", EXTRACTOR_METATYPE_PAPER_SIZE},
{"%%PageOrder: ", EXTRACTOR_METATYPE_PAGE_ORDER},
{"%%LanguageLevel: ", EXTRACTOR_METATYPE_FORMAT_VERSION},
{"%%Magnification: ", EXTRACTOR_METATYPE_MAGNIFICATION},
/* Also widely used but not supported since they
probably make no sense:
"%%BoundingBox: ",
"%%DocumentNeededResources: ",
"%%DocumentSuppliedResources: ",
"%%DocumentProcSets: ",
"%%DocumentData: ", */
{NULL, 0}
};
#define PS_HEADER "%!PS-Adobe"
/* mimetype = application/postscript */
int
EXTRACTOR_ps_extract (const char *data,
size_t size,
EXTRACTOR_MetaDataProcessor proc,
void *proc_cls,
const char *options)
{
size_t pos;
char *line;
int i;
int lastLine;
int ret;
pos = strlen (PS_HEADER);
if ( (size < pos) ||
(0 != strncmp (PS_HEADER,
data,
pos)) )
return 0;
ret = 0;
if (0 != proc (proc_cls,
"ps",
EXTRACTOR_METATYPE_MIMETYPE,
EXTRACTOR_METAFORMAT_UTF8,
"text/plain",
"application/postscript",
strlen ("application/postscript")+1))
return 1;
/* skip rest of first line */
while ((pos < size) && (data[pos] != '\n'))
pos++;
lastLine = -1;
line = NULL;
/* while Windows-PostScript does not seem to (always?) put
"%%EndComments", this should allow us to not read through most of
the file for all the sane applications... For Windows-generated
PS files, we will bail out at the end of the file. */
while (0 != strncmp ("%%EndComments", line, strlen ("%%EndComments")))
{
free (line);
line = readline (data, size, pos);
if (line == NULL)
break;
i = 0;
while (tests[i].prefix != NULL)
{
ret = testmeta (line, tests[i].prefix, tests[i].type, proc, proc_cls);
if (ret != 0)
break;
i++;
}
if (ret != 0)
break;
/* %%+ continues previous meta-data type... */
if ( (lastLine != -1) && (0 == strncmp (line, "%%+ ", strlen ("%%+ "))))
{
ret = testmeta (line, "%%+ ", tests[lastLine].type, proc, proc_cls);
}
else
{
/* update "previous" type */
if (tests[i].prefix == NULL)
lastLine = -1;
else
lastLine = i;
}
if (pos + strlen (line) + 1 <= pos)
break; /* overflow */
pos += strlen (line) + 1; /* skip newline, too; guarantee progress! */
}
free (line);
return ret;
}
/* end of ps_extractor.c */
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