Add portable pseudo-random number generator based on the lrand48 family.

1 files changed, 19 insertions, 0 deletions

diff --git a/source/fitz/context.c b/source/fitz/context.c
index f4ebdc98..67fef05b 100644
--- a/source/fitz/context.c
+++ b/source/fitz/context.c
@@ -3,6 +3,7 @@
 #include <assert.h>
 #include <string.h>
 #include <stdio.h>
+#include <time.h>
 
 struct fz_id_context_s
 {
@@ -132,6 +133,22 @@ void fz_tune_image_scale(fz_context *ctx, fz_tune_image_scale_fn *image_scale, v
 	ctx->tuning->image_scale_arg = arg;
 }
 
+static void fz_init_random_context(fz_context *ctx)
+{
+	if (!ctx)
+		return;
+
+	ctx->seed48[0] = 0;
+	ctx->seed48[1] = 0;
+	ctx->seed48[2] = 0;
+	ctx->seed48[3] = 0xe66d;
+	ctx->seed48[4] = 0xdeec;
+	ctx->seed48[5] = 0x5;
+	ctx->seed48[6] = 0xb;
+
+	fz_srand48(ctx, (uint32_t)time(NULL));
+}
+
 void
 fz_drop_context(fz_context *ctx)
 {
@@ -250,6 +267,7 @@ fz_new_context_imp(const fz_alloc_context *alloc, const fz_locks_context *locks,
 		fz_new_document_handler_context(ctx);
 		fz_new_style_context(ctx);
 		fz_new_tuning_context(ctx);
+		fz_init_random_context(ctx);
 	}
 	fz_catch(ctx)
 	{
@@ -304,6 +322,7 @@ fz_clone_context_internal(fz_context *ctx)
 	new_ctx->id = fz_keep_id_context(new_ctx);
 	new_ctx->tuning = ctx->tuning;
 	new_ctx->tuning = fz_keep_tuning_context(new_ctx);
+	memcpy(new_ctx->seed48, ctx->seed48, sizeof ctx->seed48);
 	new_ctx->handler = ctx->handler;
 	new_ctx->handler = fz_keep_document_handler_context(new_ctx);