/*
* Load uncompressed contents of a stream into buf.
*/
fz_error
pdf_load_stream(fz_buffer **bufp, pdf_xref *xref, int num, int gen)
{
fz_error error;
fz_stream *stm;
fz_obj *dict, *obj;
int i, len;
error = pdf_open_stream(&stm, xref, num, gen);
if (error)
return fz_rethrow(error, "cannot open stream (%d %d R)", num, gen);
error = pdf_load_object(&dict, xref, num, gen);
if (error)
return fz_rethrow(error, "cannot load stream dictionary (%d %d R)", num, gen);
len = fz_to_int(fz_dict_gets(dict, "Length"));
obj = fz_dict_gets(dict, "Filter");
len = pdf_guess_filter_length(len, fz_to_name(obj));
for (i = 0; i < fz_array_len(obj); i++)
len = pdf_guess_filter_length(len, fz_to_name(fz_array_get(obj, i)));
fz_drop_obj(dict);
error = fz_read_all(bufp, stm, len);
if (error)
{
fz_close(stm);
return fz_rethrow(error, "cannot read raw stream (%d %d R)", num, gen);
}
fz_close(stm);
return fz_okay;
}
fz_buffer *
pdf_load_raw_renumbered_stream(fz_context *ctx, pdf_document *doc, int num, int gen, int orig_num, int orig_gen)
{
fz_stream *stm;
pdf_obj *dict;
int len;
fz_buffer *buf;
if (num > 0 && num < pdf_xref_len(ctx, doc))
{
pdf_xref_entry *entry = pdf_get_xref_entry(ctx, doc, num);
if (entry->stm_buf)
return fz_keep_buffer(ctx, entry->stm_buf);
}
dict = pdf_load_object(ctx, doc, num, gen);
len = pdf_to_int(ctx, pdf_dict_get(ctx, dict, PDF_NAME_Length));
pdf_drop_obj(ctx, dict);
stm = pdf_open_raw_renumbered_stream(ctx, doc, num, gen, orig_num, orig_gen);
buf = fz_read_all(ctx, stm, len);
fz_drop_stream(ctx, stm);
return buf;
}
/*
* Load raw (compressed but decrypted) contents of a stream into buf.
*/
fz_error
pdf_load_raw_stream(fz_buffer **bufp, pdf_xref *xref, int num, int gen)
{
fz_error error;
fz_stream *stm;
fz_obj *dict;
int len;
error = pdf_load_object(&dict, xref, num, gen);
if (error)
return fz_rethrow(error, "cannot load stream dictionary (%d %d R)", num, gen);
len = fz_to_int(fz_dict_gets(dict, "Length"));
fz_drop_obj(dict);
error = pdf_open_raw_stream(&stm, xref, num, gen);
if (error)
return fz_rethrow(error, "cannot open raw stream (%d %d R)", num, gen);
error = fz_read_all(bufp, stm, len);
if (error)
{
fz_close(stm);
return fz_rethrow(error, "cannot read raw stream (%d %d R)", num, gen);
}
fz_close(stm);
return fz_okay;
}
fz_buffer *
pdf_load_raw_renumbered_stream(pdf_document *xref, int num, int gen, int orig_num, int orig_gen)
{
fz_stream *stm;
pdf_obj *dict;
int len;
fz_buffer *buf;
if (num > 0 && num < xref->len && xref->table[num].stm_buf)
return fz_keep_buffer(xref->ctx, xref->table[num].stm_buf);
dict = pdf_load_object(xref, num, gen);
/* RJW: "cannot load stream dictionary (%d %d R)", num, gen */
len = pdf_to_int(pdf_dict_gets(dict, "Length"));
pdf_drop_obj(dict);
stm = pdf_open_raw_renumbered_stream(xref, num, gen, orig_num, orig_gen);
/* RJW: "cannot open raw stream (%d %d R)", num, gen */
buf = fz_read_all(stm, len);
/* RJW: "cannot read raw stream (%d %d R)", num, gen */
fz_close(stm);
return buf;
}
/* Image specific methods */
static void
res_image_init(fz_context *ctx, pdf_document *doc, pdf_res_table *table)
{
int len, k;
pdf_obj *obj;
pdf_obj *type;
pdf_obj *res = NULL;
fz_image *image = NULL;
unsigned char digest[16];
fz_var(obj);
fz_var(image);
fz_var(res);
fz_try(ctx)
{
table->hash = fz_new_hash_table(ctx, 4096, 16, -1);
len = pdf_count_objects(ctx, doc);
for (k = 1; k < len; k++)
{
obj = pdf_load_object(ctx, doc, k, 0);
type = pdf_dict_get(ctx, obj, PDF_NAME_Subtype);
if (pdf_name_eq(ctx, type, PDF_NAME_Image))
{
image = pdf_load_image(ctx, doc, obj);
res_image_get_md5(ctx, image, digest);
fz_drop_image(ctx, image);
image = NULL;
/* Don't allow overwrites. */
if (fz_hash_find(ctx, table->hash, digest) == NULL)
fz_hash_insert(ctx, table->hash, digest, obj);
}
else
{
pdf_drop_obj(ctx, obj);
}
obj = NULL;
}
}
fz_always(ctx)
{
fz_drop_image(ctx, image);
pdf_drop_obj(ctx, obj);
}
fz_catch(ctx)
{
res_table_free(ctx, table);
fz_rethrow(ctx);
}
}
static fz_buffer *
pdf_load_image_stream(fz_context *ctx, pdf_document *doc, int num, int gen, int orig_num, int orig_gen, fz_compression_params *params, int *truncated)
{
fz_stream *stm = NULL;
pdf_obj *dict, *obj;
int i, len, n;
fz_buffer *buf;
fz_var(buf);
if (num > 0 && num < pdf_xref_len(ctx, doc))
{
pdf_xref_entry *entry = pdf_get_xref_entry(ctx, doc, num);
/* Return ref to existing buffer, but only if uncompressed,
* or shortstoppable */
if (can_reuse_buffer(ctx, entry, params))
return fz_keep_buffer(ctx, entry->stm_buf);
}
dict = pdf_load_object(ctx, doc, num, gen);
len = pdf_to_int(ctx, pdf_dict_get(ctx, dict, PDF_NAME_Length));
obj = pdf_dict_get(ctx, dict, PDF_NAME_Filter);
len = pdf_guess_filter_length(len, pdf_to_name(ctx, obj));
n = pdf_array_len(ctx, obj);
for (i = 0; i < n; i++)
len = pdf_guess_filter_length(len, pdf_to_name(ctx, pdf_array_get(ctx, obj, i)));
pdf_drop_obj(ctx, dict);
stm = pdf_open_image_stream(ctx, doc, num, gen, orig_num, orig_gen, params);
fz_try(ctx)
{
if (truncated)
buf = fz_read_best(ctx, stm, len, truncated);
else
buf = fz_read_all(ctx, stm, len);
}
fz_always(ctx)
{
fz_drop_stream(ctx, stm);
}
fz_catch(ctx)
{
fz_rethrow_message(ctx, "cannot read raw stream (%d %d R)", num, gen);
}
return buf;
}
static void preloadobjstms(void)
{
fz_obj *obj;
int num;
for (num = 0; num < xref->len; num++)
{
if (xref->table[num].type == 'o')
{
obj = pdf_load_object(xref, num, 0);
fz_drop_obj(obj);
}
}
}
static void preloadobjstms(void)
{
fz_error error;
fz_obj *obj;
int num;
for (num = 0; num < xref->len; num++)
{
if (xref->table[num].type == 'o')
{
error = pdf_load_object(&obj, xref, num, 0);
if (error)
die(error);
fz_drop_obj(ctx, obj);
}
}
}
static void writeobject(int num, int gen)
{
fz_error error;
fz_obj *obj;
fz_obj *type;
error = pdf_load_object(&obj, xref, num, gen);
if (error)
die(error);
/* skip ObjStm and XRef objects */
if (fz_is_dict(ctx, obj))
{
type = fz_dict_gets(ctx, obj, "Type");
if (fz_is_name(ctx, type) && !strcmp(fz_to_name(ctx, type), "ObjStm"))
{
uselist[num] = 0;
fz_drop_obj(ctx, obj);
return;
}
if (fz_is_name(ctx, type) && !strcmp(fz_to_name(ctx, type), "XRef"))
{
uselist[num] = 0;
fz_drop_obj(ctx, obj);
return;
}
}
if (!pdf_is_stream(xref, num, gen))
{
fprintf(out, "%d %d obj\n", num, gen);
fz_fprint_obj(ctx, out, obj, !doexpand);
fprintf(out, "endobj\n\n");
}
else
{
if (doexpand && !pdf_is_jpx_image(ctx, obj))
expandstream(obj, num, gen);
else
copystream(obj, num, gen);
}
fz_drop_obj(ctx, obj);
}
fz_buffer *
pdf_load_image_stream(pdf_document *xref, int num, int gen, int orig_num, int orig_gen, pdf_image_params *params)
{
fz_context *ctx = xref->ctx;
fz_stream *stm = NULL;
pdf_obj *dict, *obj;
int i, len, n;
fz_buffer *buf;
fz_var(buf);
if (num > 0 && num < xref->len && xref->table[num].stm_buf)
return fz_keep_buffer(xref->ctx, xref->table[num].stm_buf);
dict = pdf_load_object(xref, num, gen);
/* RJW: "cannot load stream dictionary (%d %d R)", num, gen */
len = pdf_to_int(pdf_dict_gets(dict, "Length"));
obj = pdf_dict_gets(dict, "Filter");
len = pdf_guess_filter_length(len, pdf_to_name(obj));
n = pdf_array_len(obj);
for (i = 0; i < n; i++)
len = pdf_guess_filter_length(len, pdf_to_name(pdf_array_get(obj, i)));
pdf_drop_obj(dict);
stm = pdf_open_image_stream(xref, num, gen, orig_num, orig_gen, params);
/* RJW: "cannot open stream (%d %d R)", num, gen */
fz_try(ctx)
{
buf = fz_read_all(stm, len);
}
fz_always(ctx)
{
fz_close(stm);
}
fz_catch(ctx)
{
fz_throw(ctx, "cannot read raw stream (%d %d R)", num, gen);
}
return buf;
}
static void showobject(int num)
{
fz_error error;
fz_obj *obj;
if (!xref)
die(fz_error_make(ctx, "no file specified"));
error = pdf_load_object(&obj, xref, num, 0);
if (error)
die(error);
if (isimage(obj))
saveimage(num);
else if (isfontdesc(obj))
savefont(obj, num);
fz_drop_obj(ctx, obj);
}
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(ctx, doc, num);
if (isimage(obj))
saveimage(num);
else if (isfontdesc(obj))
savefont(obj, num);
pdf_drop_obj(ctx, obj);
}
fz_catch(ctx)
{
fz_warn(ctx, "ignoring object %d", num);
}
}
/*
* Load raw (compressed but decrypted) contents of a stream into buf.
*/
fz_buffer *
pdf_load_raw_stream(pdf_document *xref, int num, int gen)
{
fz_stream *stm;
pdf_obj *dict;
int len;
fz_buffer *buf;
dict = pdf_load_object(xref, num, gen);
/* RJW: "cannot load stream dictionary (%d %d R)", num, gen */
len = pdf_to_int(pdf_dict_gets(dict, "Length"));
pdf_drop_obj(dict);
stm = pdf_open_raw_stream(xref, num, gen);
/* RJW: "cannot open raw stream (%d %d R)", num, gen */
buf = fz_read_all(stm, len);
/* RJW: "cannot read raw stream (%d %d R)", num, gen */
fz_close(stm);
return buf;
}
static void writeobject(int num, int gen)
{
fz_obj *obj;
fz_obj *type;
obj = pdf_load_object(xref, num, gen);
/* skip ObjStm and XRef objects */
if (fz_is_dict(obj))
{
type = fz_dict_gets(obj, "Type");
if (fz_is_name(type) && !strcmp(fz_to_name(type), "ObjStm"))
{
uselist[num] = 0;
fz_drop_obj(obj);
return;
}
if (fz_is_name(type) && !strcmp(fz_to_name(type), "XRef"))
{
uselist[num] = 0;
fz_drop_obj(obj);
return;
}
}
if (!pdf_is_stream(xref, num, gen))
{
fprintf(out, "%d %d obj\n", num, gen);
fz_fprint_obj(out, obj, doexpand == 0);
fprintf(out, "endobj\n\n");
}
else
{
int dontexpand = 0;
if (doexpand != 0 && doexpand != expand_all)
{
fz_obj *o;
if ((o = fz_dict_gets(obj, "Type"), !strcmp(fz_to_name(o), "XObject")) &&
(o = fz_dict_gets(obj, "Subtype"), !strcmp(fz_to_name(o), "Image")))
dontexpand = !(doexpand & expand_images);
if (o = fz_dict_gets(obj, "Type"), !strcmp(fz_to_name(o), "Font"))
dontexpand = !(doexpand & expand_fonts);
if (o = fz_dict_gets(obj, "Type"), !strcmp(fz_to_name(o), "FontDescriptor"))
dontexpand = !(doexpand & expand_fonts);
if ((o = fz_dict_gets(obj, "Length1")) != NULL)
dontexpand = !(doexpand & expand_fonts);
if ((o = fz_dict_gets(obj, "Length2")) != NULL)
dontexpand = !(doexpand & expand_fonts);
if ((o = fz_dict_gets(obj, "Length3")) != NULL)
dontexpand = !(doexpand & expand_fonts);
if (o = fz_dict_gets(obj, "Subtype"), !strcmp(fz_to_name(o), "Type1C"))
dontexpand = !(doexpand & expand_fonts);
if (o = fz_dict_gets(obj, "Subtype"), !strcmp(fz_to_name(o), "CIDFontType0C"))
dontexpand = !(doexpand & expand_fonts);
}
if (doexpand && !dontexpand && !pdf_is_jpx_image(ctx, obj))
expandstream(obj, num, gen);
else
copystream(obj, num, gen);
}
fz_drop_obj(obj);
}
static fz_error
pdf_load_obj_stm(pdf_xref *xref, int num, int gen, char *buf, int cap)
{
fz_error error;
fz_stream *stm;
fz_obj *objstm;
int *numbuf;
int *ofsbuf;
fz_obj *obj;
int first;
int count;
int i, n;
int tok;
error = pdf_load_object(&objstm, xref, num, gen);
if (error)
return fz_rethrow(error, "cannot load object stream object (%d %d R)", num, gen);
count = fz_to_int(fz_dict_gets(objstm, "N"));
first = fz_to_int(fz_dict_gets(objstm, "First"));
numbuf = fz_calloc(count, sizeof(int));
ofsbuf = fz_calloc(count, sizeof(int));
error = pdf_open_stream(&stm, xref, num, gen);
if (error)
{
error = fz_rethrow(error, "cannot open object stream (%d %d R)", num, gen);
goto cleanupbuf;
}
for (i = 0; i < count; i++)
{
error = pdf_lex(&tok, stm, buf, cap, &n);
if (error || tok != PDF_TOK_INT)
{
error = fz_rethrow(error, "corrupt object stream (%d %d R)", num, gen);
goto cleanupstm;
}
numbuf[i] = atoi(buf);
error = pdf_lex(&tok, stm, buf, cap, &n);
if (error || tok != PDF_TOK_INT)
{
error = fz_rethrow(error, "corrupt object stream (%d %d R)", num, gen);
goto cleanupstm;
}
ofsbuf[i] = atoi(buf);
}
fz_seek(stm, first, 0);
for (i = 0; i < count; i++)
{
fz_seek(stm, first + ofsbuf[i], 0);
error = pdf_parse_stm_obj(&obj, xref, stm, buf, cap);
if (error)
{
error = fz_rethrow(error, "cannot parse object %d in stream (%d %d R)", i, num, gen);
goto cleanupstm;
}
if (numbuf[i] < 1 || numbuf[i] >= xref->len)
{
fz_drop_obj(obj);
error = fz_throw("object id (%d 0 R) out of range (0..%d)", numbuf[i], xref->len - 1);
goto cleanupstm;
}
if (xref->table[numbuf[i]].type == 'o' && xref->table[numbuf[i]].ofs == num)
{
if (xref->table[numbuf[i]].obj)
fz_drop_obj(xref->table[numbuf[i]].obj);
xref->table[numbuf[i]].obj = obj;
}
else
{
fz_drop_obj(obj);
}
}
fz_close(stm);
fz_free(ofsbuf);
fz_free(numbuf);
fz_drop_obj(objstm);
return fz_okay;
cleanupstm:
fz_close(stm);
cleanupbuf:
fz_free(ofsbuf);
fz_free(numbuf);
fz_drop_obj(objstm);
return error; /* already rethrown */
}
fz_error
pdf_open_xref_with_stream(pdf_xref **xrefp, fz_stream *file, char *password)
{
pdf_xref *xref;
fz_error error;
fz_obj *encrypt, *id;
fz_obj *dict, *obj;
int i, repaired = 0;
/* install pdf specific callback */
fz_resolve_indirect = pdf_resolve_indirect;
xref = fz_malloc(sizeof(pdf_xref));
memset(xref, 0, sizeof(pdf_xref));
xref->file = fz_keep_stream(file);
error = pdf_load_xref(xref, xref->scratch, sizeof xref->scratch);
if (error)
{
fz_catch(error, "trying to repair");
if (xref->table)
{
fz_free(xref->table);
xref->table = NULL;
xref->len = 0;
}
if (xref->trailer)
{
fz_drop_obj(xref->trailer);
xref->trailer = NULL;
}
error = pdf_repair_xref(xref, xref->scratch, sizeof xref->scratch);
if (error)
{
pdf_free_xref(xref);
return fz_rethrow(error, "cannot repair document");
}
repaired = 1;
}
encrypt = fz_dict_gets(xref->trailer, "Encrypt");
id = fz_dict_gets(xref->trailer, "ID");
if (fz_is_dict(encrypt))
{
error = pdf_new_crypt(&xref->crypt, encrypt, id);
if (error)
{
pdf_free_xref(xref);
return fz_rethrow(error, "cannot decrypt document");
}
}
if (pdf_needs_password(xref))
{
/* Only care if we have a password */
if (password)
{
int okay = pdf_authenticate_password(xref, password);
if (!okay)
{
pdf_free_xref(xref);
return fz_throw("invalid password");
}
}
}
if (repaired)
{
int hasroot, hasinfo;
error = pdf_repair_obj_stms(xref);
if (error)
{
pdf_free_xref(xref);
return fz_rethrow(error, "cannot repair document");
}
hasroot = fz_dict_gets(xref->trailer, "Root") != NULL;
hasinfo = fz_dict_gets(xref->trailer, "Info") != NULL;
for (i = 1; i < xref->len; i++)
{
if (xref->table[i].type == 0 || xref->table[i].type == 'f')
continue;
error = pdf_load_object(&dict, xref, i, 0);
if (error)
{
fz_catch(error, "ignoring broken object (%d 0 R)", i);
continue;
}
if (!hasroot)
{
obj = fz_dict_gets(dict, "Type");
if (fz_is_name(obj) && !strcmp(fz_to_name(obj), "Catalog"))
{
obj = fz_new_indirect(i, 0, xref);
fz_dict_puts(xref->trailer, "Root", obj);
fz_drop_obj(obj);
}
}
if (!hasinfo)
{
if (fz_dict_gets(dict, "Creator") || fz_dict_gets(dict, "Producer"))
{
obj = fz_new_indirect(i, 0, xref);
fz_dict_puts(xref->trailer, "Info", obj);
fz_drop_obj(obj);
}
}
fz_drop_obj(dict);
}
}
error = pdf_read_ocg(xref);
if (error)
{
pdf_free_xref(xref);
return fz_rethrow(error, "Broken Optional Content");
}
*xrefp = xref;
return fz_okay;
}
