diff options
| -rw-r--r-- | apps/pdfclean.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/apps/pdfclean.c b/apps/pdfclean.c index d36c612f..ee6ca722 100644 --- a/apps/pdfclean.c +++ b/apps/pdfclean.c @@ -109,6 +109,40 @@ static void renumberobj(fz_obj *obj) } } +static void removeduplicateobjs(void) +{ + int num, other; + + newnumlist = fz_malloc(xref->len * sizeof(int)); + for (num = 0; num < xref->len; num++) + newnumlist[num] = num; + + for (num = 1; num < xref->len; num++) + { + for (other = 1; other < num; other++) + { + fz_obj *a = fz_resolveindirect(xref->table[num].obj); + fz_obj *b = fz_resolveindirect(xref->table[other].obj); + + if (num == other || + pdf_isstream(xref, num, 0) || + pdf_isstream(xref, other, 0) || + fz_objcmp(a, b)) + continue; + + newnumlist[num] = num < other ? num : other; + break; + } + } + + renumberobj(xref->trailer); + for (num = 0; num < xref->len; num++) + renumberobj(xref->table[num].obj); + + fz_free(newnumlist); +} + + static void preloadobjstms(void) { fz_error error; @@ -268,7 +302,9 @@ static void cleanusage(void) fprintf(stderr, "usage: pdfclean [options] input.pdf [outfile.pdf] [pages]\n" "\t-p -\tpassword for decryption\n" - "\t-g\tgarbage collect unused objects (an additional -g compacts xref)\n" + "\t-g\tgarbage collect unused objects\n" + "\t-gg\tin addition to -g xref is compacted\n" + "\t-ggg\tin addition to -gg identical objects are garbage collected\n" "\t-x\texpand compressed streams\n"); exit(1); } @@ -505,6 +541,10 @@ int main(int argc, char **argv) if (subset) retainpages(argc, argv); + /* Coalesce identical objects */ + if (dogarbage >= 3) + removeduplicateobjs(); + /* Sweep & mark objects from the trailer */ sweepobj(xref->trailer); |