Remove superfluous context null checks.

Code MUST pass a non-null context to all functions.

Checking ctx for null and failing silently is no more useful
than segfaulting.

fz_keep_imp and fz_drop_imp handle NULL pointers safely, so
the NULL checks for this can also be dropped at the same time.

6 files changed, 29 insertions, 65 deletions

diff --git a/source/fitz/document.c b/source/fitz/document.c
index d783bc70..fdf4d2b7 100644
--- a/source/fitz/document.c
+++ b/source/fitz/document.c
@@ -46,7 +46,7 @@ void fz_register_document_handler(fz_context *ctx, const fz_document_handler *ha
 	fz_document_handler_context *dc;
 	int i;
 
-	if (!ctx || !handler)
+	if (!handler)
 		return;
 
 	dc = ctx->handler;
@@ -70,8 +70,6 @@ fz_open_document_with_stream(fz_context *ctx, const char *magic, fz_stream *stre
 	int best_i, best_score;
 	fz_document_handler_context *dc;
 
-	if (ctx == NULL)
-		return NULL;
 	if (magic == NULL || stream == NULL)
 		fz_throw(ctx, FZ_ERROR_GENERIC, "no document to open");
 
@@ -106,8 +104,6 @@ fz_open_document(fz_context *ctx, const char *filename)
 	fz_stream *file;
 	fz_document *doc;
 
-	if (ctx == NULL)
-		return NULL;
 	if (filename == NULL)
 		fz_throw(ctx, FZ_ERROR_GENERIC, "no document to open");
 
@@ -429,34 +425,29 @@ fz_page_presentation(fz_context *ctx, fz_page *page, fz_transition *transition,
 
 int fz_count_separations_on_page(fz_context *ctx, fz_page *page)
 {
-	if (ctx == NULL || page == NULL || page->count_separations == NULL)
-		return 0;
-
-	return page->count_separations(ctx, page);
+	if (page && page->count_separations)
+		return page->count_separations(ctx, page);
+	return 0;
 }
 
 void fz_control_separation_on_page(fz_context *ctx, fz_page *page, int sep, int disable)
 {
-	if (ctx == NULL || page == NULL || page->control_separation == NULL)
-		return;
-
-	page->control_separation(ctx, page, sep, disable);
+	if (page && page->control_separation)
+		page->control_separation(ctx, page, sep, disable);
 }
 
 int fz_separation_disabled_on_page (fz_context *ctx, fz_page *page, int sep)
 {
-	if (ctx == NULL || page == NULL || page->separation_disabled == NULL)
-		return 0;
-	return page->separation_disabled(ctx, page, sep);
+	if (page && page->separation_disabled)
+		return page->separation_disabled(ctx, page, sep);
+	return 0;
 }
 
 const char *fz_get_separation_on_page(fz_context *ctx, fz_page *page, int sep, uint32_t *rgba, uint32_t *cmyk)
 {
-	if (ctx == NULL || page == NULL || page->get_separation == NULL)
-	{
-		*rgba = 0;
-		*cmyk = 0;
-		return NULL;
-	}
-	return page->get_separation(ctx, page, sep, rgba, cmyk);
+	if (page && page->get_separation)
+		return page->get_separation(ctx, page, sep, rgba, cmyk);
+	*rgba = 0;
+	*cmyk = 0;
+	return NULL;
 }
diff --git a/source/fitz/font.c b/source/fitz/font.c
index 6d86133c..88d5e358 100644
--- a/source/fitz/font.c
+++ b/source/fitz/font.c
@@ -110,7 +110,7 @@ free_resources(fz_context *ctx, fz_font *font)
 
 void fz_decouple_type3_font(fz_context *ctx, fz_font *font, void *t3doc)
 {
-	if (!ctx || !font || !t3doc || font->t3doc == NULL)
+	if (!font || !t3doc || font->t3doc == NULL)
 		return;
 
 	if (font->t3doc != t3doc)
diff --git a/source/fitz/path.c b/source/fitz/path.c
index 3befcf23..8fef2a32 100644
--- a/source/fitz/path.c
+++ b/source/fitz/path.c
@@ -1547,7 +1547,7 @@ fz_clone_path(fz_context *ctx, fz_path *path)
 
 	assert(ctx != NULL);
 
-	if (ctx == NULL || path == NULL)
+	if (path == NULL)
 		return NULL;
 
 	new_path = fz_malloc_struct(ctx, fz_path);
diff --git a/source/fitz/separation.c b/source/fitz/separation.c
index 9968b574..3c6efc03 100644
--- a/source/fitz/separation.c
+++ b/source/fitz/separation.c
@@ -22,17 +22,11 @@ fz_separations *fz_new_separations(fz_context *ctx)
 
 fz_separations *fz_keep_separations(fz_context *ctx, fz_separations *sep)
 {
-	if (!ctx || !sep)
-		return NULL;
-
 	return fz_keep_imp(ctx, sep, &sep->refs);
 }
 
 void fz_drop_separations(fz_context *ctx, fz_separations *sep)
 {
-	if (!ctx || !sep)
-		return;
-
 	if (fz_drop_imp(ctx, sep, &sep->refs))
 	{
 		int i;
@@ -46,12 +40,12 @@ void fz_add_separation(fz_context *ctx, fz_separations *sep, uint32_t rgb, uint3
 {
 	int n;
 
-	if (!ctx || !sep)
-		return;
+	if (!sep)
+		fz_throw(ctx, FZ_ERROR_GENERIC, "can't add to non-existent separations");
 
 	n = sep->num_separations;
 	if (n == FZ_MAX_SEPARATIONS)
-		fz_throw(ctx, FZ_ERROR_GENERIC, "Too many separations");
+		fz_throw(ctx, FZ_ERROR_GENERIC, "too many separations");
 
 	sep->name[n] = fz_strdup(ctx, name);
 	sep->equiv_rgb[n] = rgb;
@@ -64,10 +58,8 @@ void fz_control_separation(fz_context *ctx, fz_separations *sep, int separation,
 {
 	int bit;
 
-	if (!ctx || !sep)
-		return;
-	if (separation < 0 || separation >= sep->num_separations)
-		fz_throw(ctx, FZ_ERROR_GENERIC, "Can't disable non-existent separation");
+	if (!sep || separation < 0 || separation >= sep->num_separations)
+		fz_throw(ctx, FZ_ERROR_GENERIC, "can't control non-existent separation");
 
 	bit = 1<<(separation & 31);
 	separation >>= 5;
@@ -97,10 +89,8 @@ int fz_separation_disabled(fz_context *ctx, fz_separations *sep, int separation)
 {
 	int bit;
 
-	if (!ctx || !sep)
-		return 0;
-	if (separation < 0 || separation >= sep->num_separations)
-		fz_throw(ctx, FZ_ERROR_GENERIC, "Can't access non-existent separation");
+	if (!sep || separation < 0 || separation >= sep->num_separations)
+		fz_throw(ctx, FZ_ERROR_GENERIC, "can't disable non-existent separation");
 
 	bit = 1<<(separation & 31);
 	separation >>= 5;
@@ -112,7 +102,7 @@ int fz_separations_all_enabled(fz_context *ctx, fz_separations *sep)
 {
 	int i;
 
-	if (!ctx || !sep)
+	if (!sep)
 		return 1;
 
 	for (i = 0; i < (FZ_MAX_SEPARATIONS + 31) / 32; i++)
@@ -124,11 +114,8 @@ int fz_separations_all_enabled(fz_context *ctx, fz_separations *sep)
 
 const char *fz_get_separation(fz_context *ctx, fz_separations *sep, int separation, uint32_t *rgb, uint32_t *cmyk)
 {
-	if (!ctx || !sep)
-		return NULL;
-
-	if (separation < 0 || separation >= sep->num_separations)
-		fz_throw(ctx, FZ_ERROR_GENERIC, "Can't access non-existent separation");
+	if (!sep || separation < 0 || separation >= sep->num_separations)
+		fz_throw(ctx, FZ_ERROR_GENERIC, "can't access non-existent separation");
 
 	if (rgb)
 		*rgb = sep->equiv_rgb[separation];
@@ -140,8 +127,7 @@ const char *fz_get_separation(fz_context *ctx, fz_separations *sep, int separati
 
 int fz_count_separations(fz_context *ctx, fz_separations *sep)
 {
-	if (!ctx || !sep)
+	if (!sep)
 		return 0;
-
 	return sep->num_separations;
 }
diff --git a/source/fitz/store.c b/source/fitz/store.c
index 639e0662..2c8a7022 100644
--- a/source/fitz/store.c
+++ b/source/fitz/store.c
@@ -749,8 +749,6 @@ int fz_store_scavenge(fz_context *ctx, size_t size, int *phase)
 	fz_store *store;
 	size_t max;
 
-	if (ctx == NULL)
-		return 0;
 	store = ctx->store;
 	if (store == NULL)
 		return 0;
@@ -808,9 +806,6 @@ fz_shrink_store(fz_context *ctx, unsigned int percent)
 	fz_store *store;
 	size_t new_size;
 
-	if (ctx == NULL)
-		return 0;
-
 	if (percent >= 100)
 		return 1;
 
@@ -841,8 +836,6 @@ void fz_filter_store(fz_context *ctx, fz_store_filter_fn *fn, void *arg, fz_stor
 	fz_store *store;
 	fz_item *item, *prev, *remove;
 
-	if (ctx == NULL)
-		return;
 	store = ctx->store;
 	if (store == NULL)
 		return;
@@ -908,7 +901,7 @@ void fz_filter_store(fz_context *ctx, fz_store_filter_fn *fn, void *arg, fz_stor
 
 void fz_defer_reap_start(fz_context *ctx)
 {
-	if (ctx == NULL || ctx->store == NULL)
+	if (ctx->store == NULL)
 		return;
 
 	fz_lock(ctx, FZ_LOCK_REAP);
@@ -920,7 +913,7 @@ void fz_defer_reap_end(fz_context *ctx)
 {
 	int reap;
 
-	if (ctx == NULL || ctx->store == NULL)
+	if (ctx->store == NULL)
 		return;
 
 	fz_lock(ctx, FZ_LOCK_ALLOC);
diff --git a/source/gprf/gprf-doc.c b/source/gprf/gprf-doc.c
index 8d6b3b32..9f9d5ebb 100644
--- a/source/gprf/gprf-doc.c
+++ b/source/gprf/gprf-doc.c
@@ -88,18 +88,12 @@ fz_new_gprf_file(fz_context *ctx, char *filename)
 static gprf_file *
 fz_keep_gprf_file(fz_context *ctx, gprf_file *file)
 {
-	if (!ctx || !file)
-		return NULL;
-
 	return fz_keep_imp(ctx, file, &file->refs);
 }
 
 static void
 fz_drop_gprf_file(fz_context *ctx, gprf_file *file)
 {
-	if (!ctx || !file)
-		return;
-
 	if (fz_drop_imp(ctx, file, &file->refs))
 	{
 		unlink(file->filename);