Move enum into zstd.h, and fix pesky switch() logic

lib/decompress/zstd_decompress.c

@@ -1398,9 +1398,9 @@ size_t ZSTD_DCtx_setFormat(ZSTD_DCtx* dctx, ZSTD_format_e format)
     return ZSTD_DCtx_setParameter(dctx, ZSTD_d_format, format);
 }
 
-size_t ZSTD_DCtx_setForceIgnoreChecksum(ZSTD_DCtx* dctx, ZSTD_format_e format)
+size_t ZSTD_DCtx_setForceIgnoreChecksum(ZSTD_DCtx* dctx, ZSTD_forceIgnoreChecksum_e shouldIgnore)
 {
-    return ZSTD_DCtx_setParameter(dctx, ZSTD_d_forceIgnoreChecksum, format);
+    return ZSTD_DCtx_setParameter(dctx, ZSTD_d_forceIgnoreChecksum, shouldIgnore);
 }
 
 ZSTD_bounds ZSTD_dParam_getBounds(ZSTD_dParameter dParam)
@@ -1423,6 +1423,7 @@ ZSTD_bounds ZSTD_dParam_getBounds(ZSTD_dParameter dParam)
         case ZSTD_d_forceIgnoreChecksum:
             bounds.lowerBound = (int)ZSTD_d_validateChecksum;
             bounds.upperBound = (int)ZSTD_d_ignoreChecksum;
+            return bounds;
         default:;
     }
     bounds.error = ERROR(parameter_unsupported);
@@ -1465,6 +1466,7 @@ size_t ZSTD_DCtx_setParameter(ZSTD_DCtx* dctx, ZSTD_dParameter dParam, int value
         case ZSTD_d_forceIgnoreChecksum:
             CHECK_DBOUNDS(ZSTD_d_forceIgnoreChecksum, value);
             dctx->forceIgnoreChecksum = (ZSTD_forceIgnoreChecksum_e)value;
+            return 0;
         default:;
     }
     RETURN_ERROR(parameter_unsupported, "");

lib/decompress/zstd_decompress_internal.h

@@ -100,11 +100,6 @@ typedef enum {
     ZSTD_obm_stable = 1     /* ZSTD_outBuffer is stable */
 } ZSTD_outBufferMode_e;
 
-typedef enum {
-    ZSTD_d_validateChecksum = 0,
-    ZSTD_d_ignoreChecksum = 1
-} ZSTD_forceIgnoreChecksum_e;
-
 struct ZSTD_DCtx_s
 {
     const ZSTD_seqSymbol* LLTptr;

lib/zstd.h

@@ -1162,6 +1162,11 @@ typedef enum {
                                  * Decoder cannot recognise automatically this format, requiring this instruction. */
 } ZSTD_format_e;
 
+typedef enum {
+    ZSTD_d_validateChecksum = 0,
+    ZSTD_d_ignoreChecksum = 1
+} ZSTD_forceIgnoreChecksum_e;
+
 typedef enum {
     /* Note: this enum and the behavior it controls are effectively internal
      * implementation details of the compressor. They are expected to continue
@@ -1712,7 +1717,7 @@ ZSTDLIB_API size_t ZSTD_DCtx_setFormat(ZSTD_DCtx* dctx, ZSTD_format_e format);
 /*! ZSTD_DCtx_setForceIgnoreChecksum() :
  *  Instruct the decoder context to ignore checksums in compressed frame.
  * @return : 0, or an error code (which can be tested using ZSTD_isError()). */
-ZSTDLIB_API size_t ZSTD_DCtx_setForceIgnoreChecksum(ZSTD_DCtx* dctx, ZSTD_format_e format);
+ZSTDLIB_API size_t ZSTD_DCtx_setForceIgnoreChecksum(ZSTD_DCtx* dctx, ZSTD_forceIgnoreChecksum_e format);
 
 /*! ZSTD_decompressStream_simpleArgs() :
  *  Same as ZSTD_decompressStream(),