static HPDF_STATUS
PngAfterWrite (HPDF_Dict obj)
{
HPDF_PTRACE ((" PngAfterWrite\n"));
HPDF_MemStream_FreeData(obj->stream);
return HPDF_OK;
}
HPDF_SaveToStream (HPDF_Doc pdf)
{
HPDF_PTRACE ((" HPDF_SaveToStream\n"));
if (!HPDF_HasDoc (pdf))
return HPDF_INVALID_DOCUMENT;
if (!pdf->stream)
pdf->stream = HPDF_MemStream_New (pdf->mmgr, HPDF_STREAM_BUF_SIZ);
if (!HPDF_Stream_Validate (pdf->stream))
return HPDF_RaiseError (&pdf->error, HPDF_INVALID_STREAM, 0);
HPDF_MemStream_FreeData (pdf->stream);
if (InternalSaveToStream (pdf, pdf->stream) != HPDF_OK)
return HPDF_CheckError (&pdf->error);
return HPDF_OK;
}
static HPDF_STATUS
PngBeforeWrite (HPDF_Dict obj)
{
HPDF_STATUS ret;
png_byte header[HPDF_PNG_BYTES_TO_CHECK];
HPDF_UINT len = HPDF_PNG_BYTES_TO_CHECK;
HPDF_Stream png_data;
HPDF_String s;
HPDF_PTRACE ((" PngBeforeWrite\n"));
HPDF_MemStream_FreeData(obj->stream);
s = HPDF_Dict_GetItem (obj, "_FILE_NAME", HPDF_OCLASS_STRING);
if (!s)
return HPDF_SetError (obj->error, HPDF_MISSING_FILE_NAME_ENTRY, 0);
png_data = HPDF_FileReader_New (obj->mmgr, (const char *)(s->value));
if (!HPDF_Stream_Validate (png_data))
return obj->error->error_no;
HPDF_MemSet (header, 0x00, HPDF_PNG_BYTES_TO_CHECK);
ret = HPDF_Stream_Read (png_data, header, &len);
if (ret != HPDF_OK ||
png_sig_cmp (header, (png_size_t)0, HPDF_PNG_BYTES_TO_CHECK)) {
HPDF_Stream_Free(png_data);
return HPDF_SetError (obj->error, HPDF_INVALID_PNG_IMAGE, 0);
}
if ((ret = LoadPngData (obj, NULL, png_data, HPDF_FALSE)) != HPDF_OK) {
HPDF_Stream_Free(png_data);
return ret;
}
HPDF_Stream_Free(png_data);
return HPDF_OK;
}