fz_error
pdf_parse_stm_obj(fz_obj **op, pdf_xref *xref, fz_stream *file, char *buf, int cap)
{
fz_error error;
int tok;
int len;
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
return fz_rethrow(error, "cannot parse token in object stream");
switch (tok)
{
case PDF_TOK_OPEN_ARRAY:
error = pdf_parse_array(op, xref, file, buf, cap);
if (error)
return fz_rethrow(error, "cannot parse object stream");
break;
case PDF_TOK_OPEN_DICT:
error = pdf_parse_dict(op, xref, file, buf, cap);
if (error)
return fz_rethrow(error, "cannot parse object stream");
break;
case PDF_TOK_NAME: *op = fz_new_name(buf); break;
case PDF_TOK_REAL: *op = fz_new_real(fz_atof(buf)); break;
case PDF_TOK_STRING: *op = fz_new_string(buf, len); break;
case PDF_TOK_TRUE: *op = fz_new_bool(1); break;
case PDF_TOK_FALSE: *op = fz_new_bool(0); break;
case PDF_TOK_NULL: *op = fz_new_null(); break;
case PDF_TOK_INT: *op = fz_new_int(atoi(buf)); break;
default: return fz_throw("unknown token in object stream");
}
return fz_okay;
}
static int
xps_decode_tiff_fax(struct tiff *tiff, int comp, fz_stream *chain, byte *wp, int wlen)
{
fz_stream *stm;
fz_obj *params;
fz_obj *columns, *rows, *black_is_1, *k, *encoded_byte_align;
int n;
fz_context *ctx = tiff->ctx;
columns = fz_new_int(ctx, tiff->imagewidth);
rows = fz_new_int(ctx, tiff->imagelength);
black_is_1 = fz_new_bool(ctx, tiff->photometric == 0);
k = fz_new_int(ctx, comp == 4 ? -1 : 0);
encoded_byte_align = fz_new_bool(ctx, comp == 2);
params = fz_new_dict(ctx, 5);
fz_dict_puts(ctx, params, "Columns", columns);
fz_dict_puts(ctx, params, "Rows", rows);
fz_dict_puts(ctx, params, "BlackIs1", black_is_1);
fz_dict_puts(ctx, params, "K", k);
fz_dict_puts(ctx, params, "EncodedByteAlign", encoded_byte_align);
fz_drop_obj(ctx, columns);
fz_drop_obj(ctx, rows);
fz_drop_obj(ctx, black_is_1);
fz_drop_obj(ctx, k);
fz_drop_obj(ctx, encoded_byte_align);
stm = fz_open_faxd(chain, params);
n = fz_read(stm, wp, wlen);
fz_close(stm);
fz_drop_obj(ctx, params);
if (n < 0)
return fz_error_note(ctx, n, "cannot read fax strip");
return fz_okay;
}
fz_error
pdf_parse_ind_obj(fz_obj **op, pdf_xref *xref,
fz_stream *file, char *buf, int cap,
int *onum, int *ogen, int *ostmofs)
{
fz_error error = fz_okay;
fz_obj *obj = NULL;
int num = 0, gen = 0, stm_ofs;
int tok;
int len;
int a, b;
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
if (tok != PDF_TOK_INT)
return fz_throw("expected object number (%d %d R)", num, gen);
num = atoi(buf);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
if (tok != PDF_TOK_INT)
return fz_throw("expected generation number (%d %d R)", num, gen);
gen = atoi(buf);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
if (tok != PDF_TOK_OBJ)
return fz_throw("expected 'obj' keyword (%d %d R)", num, gen);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
switch (tok)
{
case PDF_TOK_OPEN_ARRAY:
error = pdf_parse_array(&obj, xref, file, buf, cap);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
break;
case PDF_TOK_OPEN_DICT:
error = pdf_parse_dict(&obj, xref, file, buf, cap);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
break;
case PDF_TOK_NAME: obj = fz_new_name(buf); break;
case PDF_TOK_REAL: obj = fz_new_real(fz_atof(buf)); break;
case PDF_TOK_STRING: obj = fz_new_string(buf, len); break;
case PDF_TOK_TRUE: obj = fz_new_bool(1); break;
case PDF_TOK_FALSE: obj = fz_new_bool(0); break;
case PDF_TOK_NULL: obj = fz_new_null(); break;
case PDF_TOK_INT:
a = atoi(buf);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
if (tok == PDF_TOK_STREAM || tok == PDF_TOK_ENDOBJ)
{
obj = fz_new_int(a);
goto skip;
}
if (tok == PDF_TOK_INT)
{
b = atoi(buf);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
if (tok == PDF_TOK_R)
{
obj = fz_new_indirect(a, b, xref);
break;
}
}
return fz_throw("expected 'R' keyword (%d %d R)", num, gen);
case PDF_TOK_ENDOBJ:
obj = fz_new_null();
goto skip;
default:
return fz_throw("syntax error in object (%d %d R)", num, gen);
}
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
{
fz_drop_obj(obj);
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
}
skip:
if (tok == PDF_TOK_STREAM)
{
int c = fz_read_byte(file);
while (c == ' ')
c = fz_read_byte(file);
if (c == '\r')
{
c = fz_peek_byte(file);
if (c != '\n')
fz_warn("line feed missing after stream begin marker (%d %d R)", num, gen);
else
fz_read_byte(file);
}
stm_ofs = fz_tell(file);
}
else if (tok == PDF_TOK_ENDOBJ)
{
stm_ofs = 0;
}
else
{
fz_warn("expected 'endobj' or 'stream' keyword (%d %d R)", num, gen);
stm_ofs = 0;
}
if (onum) *onum = num;
if (ogen) *ogen = gen;
if (ostmofs) *ostmofs = stm_ofs;
*op = obj;
return fz_okay;
}
fz_error
pdf_parse_dict(fz_obj **op, pdf_xref *xref, fz_stream *file, char *buf, int cap)
{
fz_error error = fz_okay;
fz_obj *dict = NULL;
fz_obj *key = NULL;
fz_obj *val = NULL;
int tok;
int len;
int a, b;
dict = fz_new_dict(8);
while (1)
{
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
{
fz_drop_obj(dict);
return fz_rethrow(error, "cannot parse dict");
}
skip:
if (tok == PDF_TOK_CLOSE_DICT)
{
*op = dict;
return fz_okay;
}
/* for BI .. ID .. EI in content streams */
if (tok == PDF_TOK_KEYWORD && !strcmp(buf, "ID"))
{
*op = dict;
return fz_okay;
}
if (tok != PDF_TOK_NAME)
{
fz_drop_obj(dict);
return fz_throw("invalid key in dict");
}
key = fz_new_name(buf);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
{
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_rethrow(error, "cannot parse dict");
}
switch (tok)
{
case PDF_TOK_OPEN_ARRAY:
error = pdf_parse_array(&val, xref, file, buf, cap);
if (error)
{
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_rethrow(error, "cannot parse dict");
}
break;
case PDF_TOK_OPEN_DICT:
error = pdf_parse_dict(&val, xref, file, buf, cap);
if (error)
{
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_rethrow(error, "cannot parse dict");
}
break;
case PDF_TOK_NAME: val = fz_new_name(buf); break;
case PDF_TOK_REAL: val = fz_new_real(fz_atof(buf)); break;
case PDF_TOK_STRING: val = fz_new_string(buf, len); break;
case PDF_TOK_TRUE: val = fz_new_bool(1); break;
case PDF_TOK_FALSE: val = fz_new_bool(0); break;
case PDF_TOK_NULL: val = fz_new_null(); break;
case PDF_TOK_INT:
/* 64-bit to allow for numbers > INT_MAX and overflow */
a = (int) strtoll(buf, 0, 10);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
{
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_rethrow(error, "cannot parse dict");
}
if (tok == PDF_TOK_CLOSE_DICT || tok == PDF_TOK_NAME ||
(tok == PDF_TOK_KEYWORD && !strcmp(buf, "ID")))
{
val = fz_new_int(a);
fz_dict_put(dict, key, val);
fz_drop_obj(val);
fz_drop_obj(key);
goto skip;
}
if (tok == PDF_TOK_INT)
{
b = atoi(buf);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
{
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_rethrow(error, "cannot parse dict");
}
if (tok == PDF_TOK_R)
{
val = fz_new_indirect(a, b, xref);
break;
}
}
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_throw("invalid indirect reference in dict");
default:
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_throw("unknown token in dict");
}
fz_dict_put(dict, key, val);
fz_drop_obj(val);
fz_drop_obj(key);
}
}
fz_error
pdf_parse_array(fz_obj **op, pdf_xref *xref, fz_stream *file, char *buf, int cap)
{
fz_error error = fz_okay;
fz_obj *ary = NULL;
fz_obj *obj = NULL;
int a = 0, b = 0, n = 0;
int tok;
int len;
ary = fz_new_array(4);
while (1)
{
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
{
fz_drop_obj(ary);
return fz_rethrow(error, "cannot parse array");
}
if (tok != PDF_TOK_INT && tok != PDF_TOK_R)
{
if (n > 0)
{
obj = fz_new_int(a);
fz_array_push(ary, obj);
fz_drop_obj(obj);
}
if (n > 1)
{
obj = fz_new_int(b);
fz_array_push(ary, obj);
fz_drop_obj(obj);
}
n = 0;
}
if (tok == PDF_TOK_INT && n == 2)
{
obj = fz_new_int(a);
fz_array_push(ary, obj);
fz_drop_obj(obj);
a = b;
n --;
}
switch (tok)
{
case PDF_TOK_CLOSE_ARRAY:
*op = ary;
return fz_okay;
case PDF_TOK_INT:
if (n == 0)
a = atoi(buf);
if (n == 1)
b = atoi(buf);
n ++;
break;
case PDF_TOK_R:
if (n != 2)
{
fz_drop_obj(ary);
return fz_throw("cannot parse indirect reference in array");
}
obj = fz_new_indirect(a, b, xref);
fz_array_push(ary, obj);
fz_drop_obj(obj);
n = 0;
break;
case PDF_TOK_OPEN_ARRAY:
error = pdf_parse_array(&obj, xref, file, buf, cap);
if (error)
{
fz_drop_obj(ary);
return fz_rethrow(error, "cannot parse array");
}
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_OPEN_DICT:
error = pdf_parse_dict(&obj, xref, file, buf, cap);
if (error)
{
fz_drop_obj(ary);
return fz_rethrow(error, "cannot parse array");
}
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_NAME:
obj = fz_new_name(buf);
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_REAL:
obj = fz_new_real(fz_atof(buf));
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_STRING:
obj = fz_new_string(buf, len);
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_TRUE:
obj = fz_new_bool(1);
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_FALSE:
obj = fz_new_bool(0);
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_NULL:
obj = fz_new_null();
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
default:
fz_drop_obj(ary);
return fz_throw("cannot parse token in array");
}
}
}
