clamp out-of-range quality

see also previous reverting commit

Allowed range for JPEG seem to be 0-100, however 0 result in zero
division, so clamp the values to a valid range as libjpeg does.

src/gpujpeg_table.c

@@ -83,6 +83,8 @@ gpujpeg_table_quantization_set_default(uint8_t* table_raw, enum gpujpeg_componen
 void
 gpujpeg_table_quantization_apply_quality(uint8_t* table_raw, int quality)
 {
+    if (quality <= 0) quality = 1;
+    if (quality > 100) quality = 100;
     int s = (quality < 50) ? (5000 / quality) : (200 - (2 * quality));
     for ( int i = 0; i < 64; i++ ) {
         int value = (s * (int)table_raw[i] + 50) / 100;

src/gpujpeg_util.h

@@ -1,6 +1,6 @@
 /**
  * @file
- * Copyright (c) 2011-2019, CESNET z.s.p.o
+ * Copyright (c) 2011-2023, CESNET z.s.p.o
  * Copyright (c) 2011, Silicon Genome, LLC.
  *
  * All rights reserved.
@@ -41,6 +41,8 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
+
+#define GPUJPEG_CLAMP(x, low, high)  (((x) > (high)) ? (high) : (((x) < (low)) ? (low) : (x)))
 
 // CUDA check error
 #define gpujpeg_cuda_check_error(msg, action) \

src/gpujpeg_writer.c

@@ -427,7 +427,7 @@ gpujpeg_writer_write_com_library(struct gpujpeg_encoder* encoder)
 {
     char creator[] = "CREATOR: GPUJPEG, quality = \0\0\0";
     snprintf(creator + strlen(creator), sizeof creator - strlen(creator), "%d",
-                    encoder->coder.param.quality);
+                    GPUJPEG_CLAMP(encoder->coder.param.quality, 1, 100));
     gpujpeg_writer_write_com(encoder, creator);
 }