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/*
* pdfextract -- the ultimate way to extract images and fonts from pdfs
*/
#include "fitz.h"
#include "mupdf.h"
static pdf_xref *xref = nil;
static int dorgb = 0;
void die(fz_error error)
{
fz_catch(error, "aborting");
if (xref)
pdf_freexref(xref);
exit(1);
}
static void usage(void)
{
fprintf(stderr, "usage: pdfextract [options] file.pdf [object numbers]\n");
fprintf(stderr, "\t-p\tpassword\n");
fprintf(stderr, "\t-r\tconvert images to rgb\n");
exit(1);
}
static int isimage(fz_obj *obj)
{
fz_obj *type = fz_dictgets(obj, "Subtype");
return fz_isname(type) && !strcmp(fz_toname(type), "Image");
}
static int isfontdesc(fz_obj *obj)
{
fz_obj *type = fz_dictgets(obj, "Type");
return fz_isname(type) && !strcmp(fz_toname(type), "FontDescriptor");
}
static void saveimage(int num)
{
fz_error error;
fz_pixmap *img;
fz_obj *ref;
char name[1024];
ref = fz_newindirect(num, 0, xref);
/* TODO: detect DCTD and save as jpeg */
error = pdf_loadimage(&img, xref, ref);
if (error)
die(error);
if (dorgb && img->colorspace && img->colorspace != fz_devicergb)
{
fz_pixmap *temp;
temp = fz_newpixmap(fz_devicergb, img->x, img->y, img->w, img->h);
fz_convertpixmap(img, temp);
fz_droppixmap(img);
img = temp;
}
if (img->n <= 4)
{
sprintf(name, "img-%04d.png", num);
printf("extracting image %s\n", name);
fz_writepng(img, name, 0);
}
else
{
sprintf(name, "img-%04d.pam", num);
printf("extracting image %s\n", name);
fz_writepam(img, name, 0);
}
fz_droppixmap(img);
fz_dropobj(ref);
}
static void savefont(fz_obj *dict, int num)
{
fz_error error;
char name[1024];
char *subtype;
fz_buffer *buf;
fz_obj *stream = nil;
fz_obj *obj;
char *ext = "";
FILE *f;
char *fontname = "font";
int n;
obj = fz_dictgets(dict, "FontName");
if (obj)
fontname = fz_toname(obj);
obj = fz_dictgets(dict, "FontFile");
if (obj)
{
stream = obj;
ext = "pfa";
}
obj = fz_dictgets(dict, "FontFile2");
if (obj)
{
stream = obj;
ext = "ttf";
}
obj = fz_dictgets(dict, "FontFile3");
if (obj)
{
stream = obj;
obj = fz_dictgets(obj, "Subtype");
if (obj && !fz_isname(obj))
die(fz_throw("Invalid font descriptor subtype"));
subtype = fz_toname(obj);
if (!strcmp(subtype, "Type1C"))
ext = "cff";
else if (!strcmp(subtype, "CIDFontType0C"))
ext = "cid";
else
die(fz_throw("Unhandled font type '%s'", subtype));
}
if (!stream)
{
fz_warn("Unhandled font type");
return;
}
buf = fz_newbuffer(0);
error = pdf_loadstream(&buf, xref, fz_tonum(stream), fz_togen(stream));
if (error)
die(error);
sprintf(name, "%s-%04d.%s", fontname, num, ext);
printf("extracting font %s\n", name);
f = fopen(name, "wb");
if (f == nil)
die(fz_throw("Error creating font file"));
n = fwrite(buf->data, 1, buf->len, f);
if (n < buf->len)
die(fz_throw("Error writing font file"));
if (fclose(f) < 0)
die(fz_throw("Error closing font file"));
fz_dropbuffer(buf);
}
static void showobject(int num)
{
fz_error error;
fz_obj *obj;
if (!xref)
die(fz_throw("no file specified"));
error = pdf_loadobject(&obj, xref, num, 0);
if (error)
die(error);
if (isimage(obj))
saveimage(num);
else if (isfontdesc(obj))
savefont(obj, num);
fz_dropobj(obj);
}
int main(int argc, char **argv)
{
fz_error error;
char *infile;
char *password = "";
int c, o;
while ((c = fz_getopt(argc, argv, "p:r")) != -1)
{
switch (c)
{
case 'p': password = fz_optarg; break;
case 'r': dorgb++; break;
default: usage(); break;
}
}
if (fz_optind == argc)
usage();
infile = argv[fz_optind++];
error = pdf_openxref(&xref, infile, password);
if (error)
die(fz_rethrow(error, "cannot open input file '%s'", infile));
if (fz_optind == argc)
{
for (o = 0; o < xref->len; o++)
showobject(o);
}
else
{
while (fz_optind < argc)
{
showobject(atoi(argv[fz_optind]));
fz_optind++;
}
}
pdf_freexref(xref);
return 0;
}
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