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/*
* pdfextract -- the ultimate way to extract images and fonts from pdfs
*/
#include "mupdf/pdf.h"
static pdf_document *doc = NULL;
static fz_context *ctx = NULL;
static int dorgb = 0;
static void usage(void)
{
fprintf(stderr, "usage: mutool extract [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(pdf_obj *obj)
{
pdf_obj *type = pdf_dict_gets(obj, "Subtype");
return pdf_is_name(type) && !strcmp(pdf_to_name(type), "Image");
}
static int isfontdesc(pdf_obj *obj)
{
pdf_obj *type = pdf_dict_gets(obj, "Type");
return pdf_is_name(type) && !strcmp(pdf_to_name(type), "FontDescriptor");
}
static void writepixmap(fz_context *ctx, fz_pixmap *pix, char *file, int rgb)
{
char buf[1024];
fz_pixmap *converted = NULL;
if (!pix)
return;
if (rgb && pix->colorspace && pix->colorspace != fz_device_rgb(ctx))
{
fz_irect bbox;
converted = fz_new_pixmap_with_bbox(ctx, fz_device_rgb(ctx), fz_pixmap_bbox(ctx, pix, &bbox));
fz_convert_pixmap(ctx, converted, pix);
pix = converted;
}
if (pix->n <= 4)
{
snprintf(buf, sizeof(buf), "%s.png", file);
printf("extracting image %s\n", buf);
fz_write_png(ctx, pix, buf, 0);
}
else
{
snprintf(buf, sizeof(buf), "%s.pam", file);
printf("extracting image %s\n", buf);
fz_write_pam(ctx, pix, buf, 0);
}
fz_drop_pixmap(ctx, converted);
}
static void saveimage(int num)
{
fz_image *image;
fz_pixmap *pix;
pdf_obj *ref;
char buf[32];
ref = pdf_new_indirect(doc, num, 0);
/* TODO: detect DCTD and save as jpeg */
image = pdf_load_image(doc, ref);
pix = fz_new_pixmap_from_image(ctx, image, 0, 0);
fz_drop_image(ctx, image);
snprintf(buf, sizeof(buf), "img-%04d", num);
writepixmap(ctx, pix, buf, dorgb);
fz_drop_pixmap(ctx, pix);
pdf_drop_obj(ref);
}
static void savefont(pdf_obj *dict, int num)
{
char namebuf[1024];
char *subtype;
fz_buffer *buf;
pdf_obj *stream = NULL;
pdf_obj *obj;
char *ext = "";
FILE *f;
char *fontname = "font";
int n, len;
unsigned char *data;
obj = pdf_dict_gets(dict, "FontName");
if (obj)
fontname = pdf_to_name(obj);
obj = pdf_dict_gets(dict, "FontFile");
if (obj)
{
stream = obj;
ext = "pfa";
}
obj = pdf_dict_gets(dict, "FontFile2");
if (obj)
{
stream = obj;
ext = "ttf";
}
obj = pdf_dict_gets(dict, "FontFile3");
if (obj)
{
stream = obj;
obj = pdf_dict_gets(obj, "Subtype");
if (obj && !pdf_is_name(obj))
fz_throw(ctx, FZ_ERROR_GENERIC, "invalid font descriptor subtype");
subtype = pdf_to_name(obj);
if (!strcmp(subtype, "Type1C"))
ext = "cff";
else if (!strcmp(subtype, "CIDFontType0C"))
ext = "cid";
else if (!strcmp(subtype, "OpenType"))
ext = "otf";
else
fz_throw(ctx, FZ_ERROR_GENERIC, "unhandled font type '%s'", subtype);
}
if (!stream)
{
fz_warn(ctx, "unhandled font type");
return;
}
buf = pdf_load_stream(doc, pdf_to_num(stream), pdf_to_gen(stream));
snprintf(namebuf, sizeof(namebuf), "%s-%04d.%s", fontname, num, ext);
printf("extracting font %s\n", namebuf);
f = fopen(namebuf, "wb");
if (!f)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot create font file");
len = fz_buffer_storage(ctx, buf, &data);
n = fwrite(data, 1, len, f);
if (n < len)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot write font file");
if (fclose(f) < 0)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot close font file");
fz_drop_buffer(ctx, buf);
}
static void showobject(int num)
{
pdf_obj *obj;
if (!doc)
fz_throw(ctx, FZ_ERROR_GENERIC, "no file specified");
fz_try(ctx)
{
obj = pdf_load_object(doc, num, 0);
if (isimage(obj))
saveimage(num);
else if (isfontdesc(obj))
savefont(obj, num);
pdf_drop_obj(obj);
}
fz_catch(ctx)
{
fz_warn(ctx, "ignoring object %d", num);
}
}
int pdfextract_main(int argc, char **argv)
{
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++];
ctx = fz_new_context(NULL, NULL, FZ_STORE_UNLIMITED);
if (!ctx)
{
fprintf(stderr, "cannot initialise context\n");
exit(1);
}
doc = pdf_open_document_no_run(ctx, infile);
if (pdf_needs_password(doc))
if (!pdf_authenticate_password(doc, password))
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot authenticate password: %s", infile);
if (fz_optind == argc)
{
int len = pdf_count_objects(doc);
for (o = 0; o < len; o++)
showobject(o);
}
else
{
while (fz_optind < argc)
{
showobject(atoi(argv[fz_optind]));
fz_optind++;
}
}
pdf_close_document(doc);
fz_flush_warnings(ctx);
fz_free_context(ctx);
return 0;
}
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