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#include "fitz-internal.h"
#include "mupdf-internal.h"
fz_rect
pdf_to_rect(fz_context *ctx, pdf_obj *array)
{
fz_rect r;
float a = pdf_to_real(pdf_array_get(array, 0));
float b = pdf_to_real(pdf_array_get(array, 1));
float c = pdf_to_real(pdf_array_get(array, 2));
float d = pdf_to_real(pdf_array_get(array, 3));
r.x0 = fz_min(a, c);
r.y0 = fz_min(b, d);
r.x1 = fz_max(a, c);
r.y1 = fz_max(b, d);
return r;
}
fz_matrix
pdf_to_matrix(fz_context *ctx, pdf_obj *array)
{
fz_matrix m;
m.a = pdf_to_real(pdf_array_get(array, 0));
m.b = pdf_to_real(pdf_array_get(array, 1));
m.c = pdf_to_real(pdf_array_get(array, 2));
m.d = pdf_to_real(pdf_array_get(array, 3));
m.e = pdf_to_real(pdf_array_get(array, 4));
m.f = pdf_to_real(pdf_array_get(array, 5));
return m;
}
/* Convert Unicode/PdfDocEncoding string into utf-8 */
char *
pdf_to_utf8(fz_context *ctx, pdf_obj *src)
{
unsigned char *srcptr = (unsigned char *) pdf_to_str_buf(src);
char *dstptr, *dst;
int srclen = pdf_to_str_len(src);
int dstlen = 0;
int ucs;
int i;
if (srclen >= 2 && srcptr[0] == 254 && srcptr[1] == 255)
{
for (i = 2; i + 1 < srclen; i += 2)
{
ucs = srcptr[i] << 8 | srcptr[i+1];
dstlen += fz_runelen(ucs);
}
dstptr = dst = fz_malloc(ctx, dstlen + 1);
for (i = 2; i + 1 < srclen; i += 2)
{
ucs = srcptr[i] << 8 | srcptr[i+1];
dstptr += fz_runetochar(dstptr, ucs);
}
}
else if (srclen >= 2 && srcptr[0] == 255 && srcptr[1] == 254)
{
for (i = 2; i + 1 < srclen; i += 2)
{
ucs = srcptr[i] | srcptr[i+1] << 8;
dstlen += fz_runelen(ucs);
}
dstptr = dst = fz_malloc(ctx, dstlen + 1);
for (i = 2; i + 1 < srclen; i += 2)
{
ucs = srcptr[i] | srcptr[i+1] << 8;
dstptr += fz_runetochar(dstptr, ucs);
}
}
else
{
for (i = 0; i < srclen; i++)
dstlen += fz_runelen(pdf_doc_encoding[srcptr[i]]);
dstptr = dst = fz_malloc(ctx, dstlen + 1);
for (i = 0; i < srclen; i++)
{
ucs = pdf_doc_encoding[srcptr[i]];
dstptr += fz_runetochar(dstptr, ucs);
}
}
*dstptr = '\0';
return dst;
}
/* Convert Unicode/PdfDocEncoding string into ucs-2 */
unsigned short *
pdf_to_ucs2(fz_context *ctx, pdf_obj *src)
{
unsigned char *srcptr = (unsigned char *) pdf_to_str_buf(src);
unsigned short *dstptr, *dst;
int srclen = pdf_to_str_len(src);
int i;
if (srclen >= 2 && srcptr[0] == 254 && srcptr[1] == 255)
{
dstptr = dst = fz_malloc_array(ctx, (srclen - 2) / 2 + 1, sizeof(short));
for (i = 2; i + 1 < srclen; i += 2)
*dstptr++ = srcptr[i] << 8 | srcptr[i+1];
}
else if (srclen >= 2 && srcptr[0] == 255 && srcptr[1] == 254)
{
dstptr = dst = fz_malloc_array(ctx, (srclen - 2) / 2 + 1, sizeof(short));
for (i = 2; i + 1 < srclen; i += 2)
*dstptr++ = srcptr[i] | srcptr[i+1] << 8;
}
else
{
dstptr = dst = fz_malloc_array(ctx, srclen + 1, sizeof(short));
for (i = 0; i < srclen; i++)
*dstptr++ = pdf_doc_encoding[srcptr[i]];
}
*dstptr = '\0';
return dst;
}
/* Convert UCS-2 string into PdfDocEncoding for authentication */
char *
pdf_from_ucs2(fz_context *ctx, unsigned short *src)
{
int i, j, len;
char *docstr;
len = 0;
while (src[len])
len++;
docstr = fz_malloc(ctx, len + 1);
for (i = 0; i < len; i++)
{
/* shortcut: check if the character has the same code point in both encodings */
if (0 < src[i] && src[i] < 256 && pdf_doc_encoding[src[i]] == src[i]) {
docstr[i] = src[i];
continue;
}
/* search through pdf_docencoding for the character's code point */
for (j = 0; j < 256; j++)
if (pdf_doc_encoding[j] == src[i])
break;
docstr[i] = j;
/* fail, if a character can't be encoded */
if (!docstr[i])
{
fz_free(ctx, docstr);
return NULL;
}
}
docstr[len] = '\0';
return docstr;
}
pdf_obj *
pdf_to_utf8_name(fz_context *ctx, pdf_obj *src)
{
char *buf = pdf_to_utf8(ctx, src);
pdf_obj *dst = pdf_new_name(ctx, buf);
fz_free(ctx, buf);
return dst;
}
pdf_obj *
pdf_parse_array(pdf_document *xref, fz_stream *file, pdf_lexbuf *buf)
{
pdf_obj *ary = NULL;
pdf_obj *obj = NULL;
int a = 0, b = 0, n = 0;
int tok;
fz_context *ctx = file->ctx;
pdf_obj *op;
fz_var(obj);
ary = pdf_new_array(ctx, 4);
fz_try(ctx)
{
while (1)
{
tok = pdf_lex(file, buf);
if (tok != PDF_TOK_INT && tok != PDF_TOK_R)
{
if (n > 0)
{
obj = pdf_new_int(ctx, a);
pdf_array_push(ary, obj);
pdf_drop_obj(obj);
obj = NULL;
}
if (n > 1)
{
obj = pdf_new_int(ctx, b);
pdf_array_push(ary, obj);
pdf_drop_obj(obj);
obj = NULL;
}
n = 0;
}
if (tok == PDF_TOK_INT && n == 2)
{
obj = pdf_new_int(ctx, a);
pdf_array_push(ary, obj);
pdf_drop_obj(obj);
obj = NULL;
a = b;
n --;
}
switch (tok)
{
case PDF_TOK_CLOSE_ARRAY:
op = ary;
goto end;
case PDF_TOK_INT:
if (n == 0)
a = buf->i;
if (n == 1)
b = buf->i;
n ++;
break;
case PDF_TOK_R:
if (n != 2)
fz_throw(ctx, "cannot parse indirect reference in array");
obj = pdf_new_indirect(ctx, a, b, xref);
pdf_array_push(ary, obj);
pdf_drop_obj(obj);
obj = NULL;
n = 0;
break;
case PDF_TOK_OPEN_ARRAY:
obj = pdf_parse_array(xref, file, buf);
pdf_array_push(ary, obj);
pdf_drop_obj(obj);
obj = NULL;
break;
case PDF_TOK_OPEN_DICT:
obj = pdf_parse_dict(xref, file, buf);
pdf_array_push(ary, obj);
pdf_drop_obj(obj);
obj = NULL;
break;
case PDF_TOK_NAME:
obj = pdf_new_name(ctx, buf->scratch);
pdf_array_push(ary, obj);
pdf_drop_obj(obj);
obj = NULL;
break;
case PDF_TOK_REAL:
obj = pdf_new_real(ctx, buf->f);
pdf_array_push(ary, obj);
pdf_drop_obj(obj);
obj = NULL;
break;
case PDF_TOK_STRING:
obj = pdf_new_string(ctx, buf->scratch, buf->len);
pdf_array_push(ary, obj);
pdf_drop_obj(obj);
obj = NULL;
break;
case PDF_TOK_TRUE:
obj = pdf_new_bool(ctx, 1);
pdf_array_push(ary, obj);
pdf_drop_obj(obj);
obj = NULL;
break;
case PDF_TOK_FALSE:
obj = pdf_new_bool(ctx, 0);
pdf_array_push(ary, obj);
pdf_drop_obj(obj);
obj = NULL;
break;
case PDF_TOK_NULL:
obj = pdf_new_null(ctx);
pdf_array_push(ary, obj);
pdf_drop_obj(obj);
obj = NULL;
break;
default:
fz_throw(ctx, "cannot parse token in array");
}
}
end:
{}
}
fz_catch(ctx)
{
pdf_drop_obj(obj);
pdf_drop_obj(ary);
fz_throw(ctx, "cannot parse array");
}
return op;
}
pdf_obj *
pdf_parse_dict(pdf_document *xref, fz_stream *file, pdf_lexbuf *buf)
{
pdf_obj *dict;
pdf_obj *key = NULL;
pdf_obj *val = NULL;
int tok;
int a, b;
fz_context *ctx = file->ctx;
dict = pdf_new_dict(ctx, 8);
fz_var(key);
fz_var(val);
fz_try(ctx)
{
while (1)
{
tok = pdf_lex(file, buf);
skip:
if (tok == PDF_TOK_CLOSE_DICT)
break;
/* for BI .. ID .. EI in content streams */
if (tok == PDF_TOK_KEYWORD && !strcmp(buf->scratch, "ID"))
break;
if (tok != PDF_TOK_NAME)
fz_throw(ctx, "invalid key in dict");
key = pdf_new_name(ctx, buf->scratch);
tok = pdf_lex(file, buf);
switch (tok)
{
case PDF_TOK_OPEN_ARRAY:
val = pdf_parse_array(xref, file, buf);
break;
case PDF_TOK_OPEN_DICT:
val = pdf_parse_dict(xref, file, buf);
break;
case PDF_TOK_NAME: val = pdf_new_name(ctx, buf->scratch); break;
case PDF_TOK_REAL: val = pdf_new_real(ctx, buf->f); break;
case PDF_TOK_STRING: val = pdf_new_string(ctx, buf->scratch, buf->len); break;
case PDF_TOK_TRUE: val = pdf_new_bool(ctx, 1); break;
case PDF_TOK_FALSE: val = pdf_new_bool(ctx, 0); break;
case PDF_TOK_NULL: val = pdf_new_null(ctx); break;
case PDF_TOK_INT:
/* 64-bit to allow for numbers > INT_MAX and overflow */
a = buf->i;
tok = pdf_lex(file, buf);
if (tok == PDF_TOK_CLOSE_DICT || tok == PDF_TOK_NAME ||
(tok == PDF_TOK_KEYWORD && !strcmp(buf->scratch, "ID")))
{
val = pdf_new_int(ctx, a);
pdf_dict_put(dict, key, val);
pdf_drop_obj(val);
val = NULL;
pdf_drop_obj(key);
key = NULL;
goto skip;
}
if (tok == PDF_TOK_INT)
{
b = buf->i;
tok = pdf_lex(file, buf);
if (tok == PDF_TOK_R)
{
val = pdf_new_indirect(ctx, a, b, xref);
break;
}
}
fz_throw(ctx, "invalid indirect reference in dict");
default:
fz_throw(ctx, "unknown token in dict");
}
pdf_dict_put(dict, key, val);
pdf_drop_obj(val);
val = NULL;
pdf_drop_obj(key);
key = NULL;
}
}
fz_catch(ctx)
{
pdf_drop_obj(dict);
pdf_drop_obj(key);
pdf_drop_obj(val);
fz_throw(ctx, "cannot parse dict");
}
return dict;
}
pdf_obj *
pdf_parse_stm_obj(pdf_document *xref, fz_stream *file, pdf_lexbuf *buf)
{
int tok;
fz_context *ctx = file->ctx;
tok = pdf_lex(file, buf);
switch (tok)
{
case PDF_TOK_OPEN_ARRAY:
return pdf_parse_array(xref, file, buf);
case PDF_TOK_OPEN_DICT:
return pdf_parse_dict(xref, file, buf);
case PDF_TOK_NAME: return pdf_new_name(ctx, buf->scratch); break;
case PDF_TOK_REAL: return pdf_new_real(ctx, buf->f); break;
case PDF_TOK_STRING: return pdf_new_string(ctx, buf->scratch, buf->len); break;
case PDF_TOK_TRUE: return pdf_new_bool(ctx, 1); break;
case PDF_TOK_FALSE: return pdf_new_bool(ctx, 0); break;
case PDF_TOK_NULL: return pdf_new_null(ctx); break;
case PDF_TOK_INT: return pdf_new_int(ctx, buf->i); break;
default: fz_throw(ctx, "unknown token in object stream");
}
return NULL; /* Stupid MSVC */
}
pdf_obj *
pdf_parse_ind_obj(pdf_document *xref,
fz_stream *file, pdf_lexbuf *buf,
int *onum, int *ogen, int *ostmofs)
{
pdf_obj *obj = NULL;
int num = 0, gen = 0, stm_ofs;
int tok;
int a, b;
fz_context *ctx = file->ctx;
fz_var(obj);
tok = pdf_lex(file, buf);
if (tok != PDF_TOK_INT)
fz_throw(ctx, "expected object number");
num = buf->i;
tok = pdf_lex(file, buf);
if (tok != PDF_TOK_INT)
fz_throw(ctx, "expected generation number (%d ? obj)", num);
gen = buf->i;
tok = pdf_lex(file, buf);
if (tok != PDF_TOK_OBJ)
fz_throw(ctx, "expected 'obj' keyword (%d %d ?)", num, gen);
tok = pdf_lex(file, buf);
switch (tok)
{
case PDF_TOK_OPEN_ARRAY:
obj = pdf_parse_array(xref, file, buf);
break;
case PDF_TOK_OPEN_DICT:
obj = pdf_parse_dict(xref, file, buf);
break;
case PDF_TOK_NAME: obj = pdf_new_name(ctx, buf->scratch); break;
case PDF_TOK_REAL: obj = pdf_new_real(ctx, buf->f); break;
case PDF_TOK_STRING: obj = pdf_new_string(ctx, buf->scratch, buf->len); break;
case PDF_TOK_TRUE: obj = pdf_new_bool(ctx, 1); break;
case PDF_TOK_FALSE: obj = pdf_new_bool(ctx, 0); break;
case PDF_TOK_NULL: obj = pdf_new_null(ctx); break;
case PDF_TOK_INT:
a = buf->i;
tok = pdf_lex(file, buf);
if (tok == PDF_TOK_STREAM || tok == PDF_TOK_ENDOBJ)
{
obj = pdf_new_int(ctx, a);
goto skip;
}
if (tok == PDF_TOK_INT)
{
b = buf->i;
tok = pdf_lex(file, buf);
if (tok == PDF_TOK_R)
{
obj = pdf_new_indirect(ctx, a, b, xref);
break;
}
}
fz_throw(ctx, "expected 'R' keyword (%d %d R)", num, gen);
case PDF_TOK_ENDOBJ:
obj = pdf_new_null(ctx);
goto skip;
default:
fz_throw(ctx, "syntax error in object (%d %d R)", num, gen);
}
fz_try(ctx)
{
tok = pdf_lex(file, buf);
}
fz_catch(ctx)
{
pdf_drop_obj(obj);
fz_throw(ctx, "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(ctx, "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(ctx, "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;
return obj;
}
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