Purge unmaintained progressive loading code.

The progressive loading and trylater mechanism adds a substantial
amount of complexity and special error handling to allow the
device interface to proceed in the face of exceptions.

The progressive loading only has a purpose for linearized files,
and has issues where it can get stuck in a state and never
progress. Since none of these issues have been reported by
users or customers, we can assume that nobody uses this
feature.

This code is notoriously fragile and difficult to get right,
and is a constant source of oss-fuzz bugs and assert errors.

Let's reduce the technical debt by removing this feature.
This commit removes the progressive loading and trylater
exceptions. Following commits will clean up and remove
the error handling that is no longer necessary.

.gitmodules

@@ -22,9 +22,6 @@
 [submodule "thirdparty/zlib"]
 	path = thirdparty/zlib
 	url = ../thirdparty-zlib.git
-[submodule "thirdparty/curl"]
-	path = thirdparty/curl
-	url = ../thirdparty-curl.git
 [submodule "thirdparty/freeglut"]
 	path = thirdparty/freeglut
 	url = ../thirdparty-freeglut.git

Makefile

@@ -86,9 +86,6 @@ $(OUT)/generated/%.o : generated/%.c
 $(OUT)/platform/x11/%.o : platform/x11/%.c
 	$(CC_CMD) -Wall $(X11_CFLAGS)
 
-$(OUT)/platform/x11/curl/%.o : platform/x11/%.c
-	$(CC_CMD) -Wall $(X11_CFLAGS) $(CURL_CFLAGS) -DHAVE_CURL
-
 $(OUT)/platform/gl/%.o : platform/gl/%.c
 	$(CC_CMD) -Wall $(THIRD_CFLAGS) $(GLUT_CFLAGS)
 
@@ -252,35 +249,20 @@ ifeq ($(HAVE_WIN32),yes)
   VIEW_APPS += $(MUVIEW_WIN32_EXE)
 endif
 
-ifeq ($(HAVE_X11),yes)
-ifeq ($(HAVE_CURL),yes)
-  MUVIEW_X11_CURL_EXE := $(OUT)/mupdf-x11-curl
-  MUVIEW_X11_CURL_OBJ += $(OUT)/platform/x11/curl/pdfapp.o
-  MUVIEW_X11_CURL_OBJ += $(OUT)/platform/x11/curl/x11_main.o
-  MUVIEW_X11_CURL_OBJ += $(OUT)/platform/x11/curl/x11_image.o
-  MUVIEW_X11_CURL_OBJ += $(OUT)/platform/x11/curl/curl_stream.o
-  $(MUVIEW_X11_CURL_EXE) : $(MUVIEW_X11_CURL_OBJ) $(MUPDF_LIB) $(THIRD_LIB) $(PKCS7_LIB) $(CURL_LIB)
-	$(LINK_CMD) $(THIRD_LIBS) $(X11_LIBS) $(CURL_LIBS) $(LIBCRYPTO_LIBS)
-  VIEW_APPS += $(MUVIEW_X11_CURL_EXE)
-endif
-endif
-
 # --- Generated dependencies ---
 
 -include $(MUPDF_OBJ:%.o=%.d)
 -include $(PKCS7_OBJ:%.o=%.d)
 -include $(THREAD_OBJ:%.o=%.d)
 -include $(THIRD_OBJ:%.o=%.d)
 -include $(GLUT_OBJ:%.o=%.d)
--include $(CURL_OBJ:%.o=%.d)
 
 -include $(MUTOOL_OBJ:%.o=%.d)
 -include $(MUVIEW_GLUT_OBJ:%.o=%.d)
 -include $(MUVIEW_X11_OBJ:%.o=%.d)
 -include $(MUVIEW_WIN32_OBJ:%.o=%.d)
 
 -include $(MURASTER_OBJ:%.o=%.d)
--include $(MUVIEW_X11_CURL_OBJ:%.o=%.d)
 
 # --- Examples ---
 

Makerules

@@ -113,12 +113,6 @@ else ifeq ($(OS),Linux)
 	SYS_ZLIB_LIBS := $(shell pkg-config --libs zlib)
   endif
 
-  HAVE_CURL := $(shell pkg-config --exists libcurl && echo yes)
-  ifeq ($(HAVE_CURL),yes)
-	SYS_CURL_CFLAGS := $(shell pkg-config --cflags libcurl)
-	SYS_CURL_LIBS := $(shell pkg-config --libs libcurl)
-  endif
-
   HAVE_GLUT := yes
   ifeq ($(HAVE_GLUT),yes)
 	SYS_GLUT_CFLAGS :=

Makethird

@@ -11,7 +11,6 @@ ifeq ($(USE_SYSTEM_LIBS),yes)
   USE_SYSTEM_OPENJPEG := yes
   USE_SYSTEM_ZLIB := yes
   USE_SYSTEM_GLUT := yes
-  USE_SYSTEM_CURL := yes
 endif
 
 ifeq ($(OS),MACOS)
@@ -376,35 +375,3 @@ GLUT_CFLAGS := -Ithirdparty/freeglut/include
 GLUT_LIBS := -lGL -lX11 -lXrandr
 
 endif
-
-# --- cURL ---
-
-ifeq ($(USE_SYSTEM_CURL),yes)
-  CURL_CFLAGS := $(SYS_CURL_CFLAGS)
-  CURL_LIBS := $(SYS_CURL_LIBS)
-else
-
-CURL_SRC += $(sort $(wildcard thirdparty/curl/lib/*.c))
-CURL_SRC += $(sort $(wildcard thirdparty/curl/lib/vauth/*.c))
-CURL_SRC += $(sort $(wildcard thirdparty/curl/lib/vtls/*.c))
-
-CURL_OBJ := $(CURL_SRC:%.c=$(OUT)/%.o)
-
-LOCAL_CURL_CFLAGS += -DHAVE_CONFIG_H
-LOCAL_CURL_CFLAGS += -DBUILDING_LIBCURL
-LOCAL_CURL_CFLAGS += -DCURL_STATICLIB
-LOCAL_CURL_CFLAGS += -DCURL_DISABLE_LDAP
-LOCAL_CURL_CFLAGS += -Ithirdparty/curl/include
-LOCAL_CURL_CFLAGS += -Ithirdparty/curl/lib
-
-CURL_LIB := $(OUT)/libcurl.a
-
-$(CURL_LIB): $(CURL_OBJ)
-
-$(OUT)/thirdparty/curl/%.o: thirdparty/curl/%.c
-	$(CC_CMD) $(LOCAL_CURL_CFLAGS)
-
-CURL_CFLAGS := -Ithirdparty/curl/include
-CURL_LIBS := -lpthread
-
-endif