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-rw-r--r--public/fpdf_dataavail.h86
1 files changed, 47 insertions, 39 deletions
diff --git a/public/fpdf_dataavail.h b/public/fpdf_dataavail.h
index c17f0311ab..3ed7d285ed 100644
--- a/public/fpdf_dataavail.h
+++ b/public/fpdf_dataavail.h
@@ -11,10 +11,16 @@
#include "fpdfview.h"
-/** The result of the process which check linearized PDF. */
-#define FSDK_IS_LINEARIZED 1
-#define FSDK_NOT_LINEARIZED 0
-#define FSDK_UNKNOW_LINEARIZED -1
+#define PDF_LINEARIZATION_UNKNOWN -1
+#define PDF_NOT_LINEARIZED 0
+#define PDF_LINEARIZED 1
+#define PDF_DATA_ERROR -1
+#define PDF_DATA_NOTAVAIL 0
+#define PDF_DATA_AVAIL 1
+#define PDF_FORM_ERROR -1
+#define PDF_FORM_NOTAVAIL 0
+#define PDF_FORM_AVAIL 1
+#define PDF_FORM_NOTEXIST 2
#ifdef __cplusplus
extern "C" {
@@ -130,17 +136,19 @@ typedef struct _FX_DOWNLOADHINTS {
* hints - Pointer to a download hints interface, receiving
* generated hints
* Return value:
-* Non-zero for page is fully available, 0 for page not yet available.
+* PDF_DATA_ERROR: A common error is returned. It can't tell
+* whehter data are availabe or not.
+* PDF_DATA_NOTAVAIL: Data are not yet available.
+* PDF_DATA_AVAIL: Data are available.
* Comments:
-* The application should call this function whenever new data arrived,
-* and process all the
-* generated download hints if any, until the function returns non-zero
-* value. Then the
-* application can call FPDFAvail_GetDocument() to get a document
-* handle.
+* Applications should call this function whenever new data arrived,
+* and process all the generated download hints if any, until the
+* function returns PDF_DATA_ERROR or PDF_DATA_AVAIL. Then
+* applications can call FPDFAvail_GetDocument() to get a document
+* handle.
*/
-DLLEXPORT int STDCALL FPDFAvail_IsDocAvail(FPDF_AVAIL avail,
- FX_DOWNLOADHINTS* hints);
+DLLEXPORT int STDCALL
+FPDFAvail_IsDocAvail(FPDF_AVAIL avail, FX_DOWNLOADHINTS* hints);
/**
* Function: FPDFAvail_GetDocument
@@ -189,15 +197,16 @@ DLLEXPORT int STDCALL FPDFAvail_GetFirstPageNum(FPDF_DOCUMENT doc);
* hints - Pointer to a download hints interface, receiving
* generated hints
* Return value:
-* Non-zero for page is fully available, 0 for page not yet available.
+* PDF_DATA_ERROR: A common error is returned. It can't tell
+* whehter data are availabe or not.
+* PDF_DATA_NOTAVAIL: Data are not yet available.
+* PDF_DATA_AVAIL: Data are available.
* Comments:
-* This function call be called only after FPDFAvail_GetDocument if
-* called.
-* The application should call this function whenever new data arrived,
-* and process all the
-* generated download hints if any, until the function returns non-zero
-* value. Then the
-* application can perform page loading.
+* This function can be called only after FPDFAvail_GetDocument is
+* called. Applications should call this function whenever new data
+* arrived and process all the generated download hints if any, until
+* this function returns PDF_DATA_ERROR or PDF_DATA_AVAIL. Then
+* applications can perform page loading.
*/
DLLEXPORT int STDCALL FPDFAvail_IsPageAvail(FPDF_AVAIL avail,
int page_index,
@@ -214,16 +223,14 @@ DLLEXPORT int STDCALL FPDFAvail_IsPageAvail(FPDF_AVAIL avail,
* hints - Pointer to a download hints interface, receiving
* generated hints
* Return value:
-* Non-zero for Form data is fully available, 0 for Form data not yet
-* available.
-* Details: -1 - error, the input parameter not correct, such as hints
-* is null.
-* 0 - data not available
-* 1 - data available
-* 2 - no form data.
+* PDF_FORM_ERROR - A common eror, in general incorrect parameters,
+* like 'hints' is nullptr.
+* PDF_FORM_NOTAVAIL - data not available
+* PDF_FORM_AVAIL - data available
+* PDF_FORM_NOTEXIST - no form data
* Comments:
-* This function call be called only after FPDFAvail_GetDocument if
-* called.
+* This function can be called only after FPDFAvail_GetDocument is
+* called.
* The application should call this function whenever new data arrived,
* and process all the
* generated download hints if any, until the function returns non-zero
@@ -243,18 +250,19 @@ DLLEXPORT int STDCALL FPDFAvail_IsFormAvail(FPDF_AVAIL avail,
* avail - Handle to document availability provider returned by
* FPDFAvail_Create
* Return value:
-* return TRUE means the document is linearized PDF else not.
-* FSDK_IS_LINEARIZED is a linearize file.
-* FSDK_NOT_LINEARIZED is not a linearize file.
-* FSDK_UNKNOW_LINEARIZED don't know whether the file is a linearize
-* file.
+* PDF_LINEARIZED is a linearize file.
+* PDF_NOT_LINEARIZED is not a linearize file.
+* PDF_LINEARIZATION_UNKNOWN doesn't know whether the file is a
+*linearize file.
+*
* Comments:
-* It return TRUE/FALSE as soon as we have first 1K data. If the
-* file's size less than
-* 1K,we don't known whether the PDF is a linearized file.
+* It return PDF_LINEARIZED or PDF_NOT_LINEARIZED as soon as
+* we have first 1K data. If the file's size less than 1K, it returns
+* PDF_LINEARIZATION_UNKNOWN because there is not enough information to
+* tell whether a PDF file is a linearized file or not.
*
*/
-DLLEXPORT FPDF_BOOL STDCALL FPDFAvail_IsLinearized(FPDF_AVAIL avail);
+DLLEXPORT int STDCALL FPDFAvail_IsLinearized(FPDF_AVAIL avail);
#ifdef __cplusplus
}