HPDF_Pages
HPDF_Pages_New (HPDF_MMgr mmgr,
HPDF_Pages parent,
HPDF_Xref xref)
{
HPDF_STATUS ret = HPDF_OK;
HPDF_Pages pages;
HPDF_PTRACE((" HPDF_Pages_New\n"));
pages = HPDF_Dict_New (mmgr);
if (!pages)
return NULL;
pages->header.obj_class |= HPDF_OSUBCLASS_PAGES;
pages->before_write_fn = Pages_BeforeWrite;
if (HPDF_Xref_Add (xref, pages) != HPDF_OK)
return NULL;
/* add requiered elements */
ret += HPDF_Dict_AddName (pages, "Type", "Pages");
ret += HPDF_Dict_Add (pages, "Kids", HPDF_Array_New (pages->mmgr));
ret += HPDF_Dict_Add (pages, "Count", HPDF_Number_New (pages->mmgr, 0));
if (ret == HPDF_OK && parent)
ret += HPDF_Pages_AddKids (parent, pages);
if (ret != HPDF_OK)
return NULL;
return pages;
}
HPDF_STATUS
Pages_BeforeWrite (HPDF_Dict obj)
{
HPDF_Array kids = (HPDF_Array )HPDF_Dict_GetItem (obj, "Kids",
HPDF_OCLASS_ARRAY);
HPDF_Number count = (HPDF_Number)HPDF_Dict_GetItem (obj, "Count",
HPDF_OCLASS_NUMBER);
HPDF_STATUS ret;
HPDF_PTRACE((" HPDF_Pages_BeforeWrite\n"));
if (!kids)
return HPDF_SetError (obj->error, HPDF_PAGES_MISSING_KIDS_ENTRY, 0);
if (count)
count->value = GetPageCount (obj);
else {
count = HPDF_Number_New (obj->mmgr, GetPageCount (obj));
if (!count)
return HPDF_Error_GetCode (obj->error);
if ((ret = HPDF_Dict_Add (obj, "Count", count)) != HPDF_OK)
return ret;
}
return HPDF_OK;
}
HPDF_STATUS
HPDF_Array_AddNumber (HPDF_Array array,
HPDF_INT32 value)
{
HPDF_Number n = HPDF_Number_New (array->mmgr, value);
HPDF_PTRACE((" HPDF_Array_AddNumber\n"));
if (!n)
return HPDF_Error_GetCode (array->error);
else
return HPDF_Array_Add (array, n);
}
static HPDF_STATUS
LoadJpegHeader (HPDF_Image image,
HPDF_Stream stream)
{
HPDF_UINT16 tag;
HPDF_UINT16 height;
HPDF_UINT16 width;
HPDF_BYTE precision;
HPDF_BYTE num_components;
const char *color_space_name;
HPDF_UINT len;
HPDF_STATUS ret;
HPDF_Array array;
HPDF_PTRACE ((" HPDF_Image_LoadJpegHeader\n"));
len = 2;
if (HPDF_Stream_Read (stream, (HPDF_BYTE *)&tag, &len) != HPDF_OK)
return HPDF_Error_GetCode (stream->error);
HPDF_UInt16Swap (&tag);
if (tag != 0xFFD8)
return HPDF_INVALID_JPEG_DATA;
/* find SOF record */
for (;;) {
HPDF_UINT16 size;
len = 2;
if (HPDF_Stream_Read (stream, (HPDF_BYTE *)&tag, &len) != HPDF_OK)
return HPDF_Error_GetCode (stream->error);
HPDF_UInt16Swap (&tag);
len = 2;
if (HPDF_Stream_Read (stream, (HPDF_BYTE *)&size, &len) != HPDF_OK)
return HPDF_Error_GetCode (stream->error);
HPDF_UInt16Swap (&size);
HPDF_PTRACE (("tag=%04X size=%u\n", tag, size));
if (tag == 0xFFC0 || tag == 0xFFC1 ||
tag == 0xFFC2 || tag == 0xFFC9) {
len = 1;
if (HPDF_Stream_Read (stream, (HPDF_BYTE *)&precision, &len) !=
HPDF_OK)
return HPDF_Error_GetCode (stream->error);
len = 2;
if (HPDF_Stream_Read (stream, (HPDF_BYTE *)&height, &len) !=
HPDF_OK)
return HPDF_Error_GetCode (stream->error);
HPDF_UInt16Swap (&height);
len = 2;
if (HPDF_Stream_Read (stream, (HPDF_BYTE *)&width, &len) != HPDF_OK)
return HPDF_Error_GetCode (stream->error);
HPDF_UInt16Swap (&width);
len = 1;
if (HPDF_Stream_Read (stream, (HPDF_BYTE *)&num_components, &len) !=
HPDF_OK)
return HPDF_Error_GetCode (stream->error);
break;
} else if ((tag | 0x00FF) != 0xFFFF)
/* lost marker */
return HPDF_SetError (image->error, HPDF_UNSUPPORTED_JPEG_FORMAT,
0);
if (HPDF_Stream_Seek (stream, size - 2, HPDF_SEEK_CUR) != HPDF_OK)
return HPDF_Error_GetCode (stream->error);
}
if (HPDF_Dict_AddNumber (image, "Height", height) != HPDF_OK)
return HPDF_Error_GetCode (stream->error);
if (HPDF_Dict_AddNumber (image, "Width", width) != HPDF_OK)
return HPDF_Error_GetCode (stream->error);
/* classification of RGB and CMYK is less than perfect
* YCbCr and YCCK are classified into RGB or CMYK.
*
* It is necessary to read APP14 data to distinguish colorspace perfectly.
*/
switch (num_components) {
case 1:
color_space_name = COL_GRAY;
break;
case 3:
color_space_name = COL_RGB;
break;
case 4:
array = HPDF_Array_New (image->mmgr);
if (!array)
return HPDF_Error_GetCode (stream->error);
ret = HPDF_Dict_Add (image, "Decode", array);
if (ret != HPDF_OK)
return HPDF_Error_GetCode (stream->error);
ret += HPDF_Array_Add (array, HPDF_Number_New (image->mmgr, 1));
ret += HPDF_Array_Add (array, HPDF_Number_New (image->mmgr, 0));
ret += HPDF_Array_Add (array, HPDF_Number_New (image->mmgr, 1));
ret += HPDF_Array_Add (array, HPDF_Number_New (image->mmgr, 0));
ret += HPDF_Array_Add (array, HPDF_Number_New (image->mmgr, 1));
ret += HPDF_Array_Add (array, HPDF_Number_New (image->mmgr, 0));
ret += HPDF_Array_Add (array, HPDF_Number_New (image->mmgr, 1));
ret += HPDF_Array_Add (array, HPDF_Number_New (image->mmgr, 0));
if (ret != HPDF_OK)
return HPDF_Error_GetCode (stream->error);
color_space_name = COL_CMYK;
break;
default:
return HPDF_SetError (image->error, HPDF_UNSUPPORTED_JPEG_FORMAT,
0);
}
if (HPDF_Dict_Add (image, "ColorSpace",
HPDF_Name_New (image->mmgr, color_space_name)) != HPDF_OK)
return HPDF_Error_GetCode (stream->error);
if (HPDF_Dict_Add (image, "BitsPerComponent",
HPDF_Number_New (image->mmgr, precision)) != HPDF_OK)
return HPDF_Error_GetCode (stream->error);
return HPDF_OK;
}
