diff options
Diffstat (limited to 'source/blender/makesdna/intern/dna_genfile.c')
-rw-r--r-- | source/blender/makesdna/intern/dna_genfile.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/source/blender/makesdna/intern/dna_genfile.c b/source/blender/makesdna/intern/dna_genfile.c index f7f3d8e0eb4..c4958f1374c 100644 --- a/source/blender/makesdna/intern/dna_genfile.c +++ b/source/blender/makesdna/intern/dna_genfile.c @@ -752,6 +752,9 @@ static void cast_primitive_type(const eSDNA_Type old_type, const int curlen = DNA_elem_type_size(new_type); double old_value_f = 0.0; + /* Intentionally overflow signed values into an unsigned type. + * Casting back to a signed value preserves the sign (when the new value is signed). + * It's also important to cast to `int64_t` when setting `old_value_f` from a signed value. */ uint64_t old_value_i = 0; for (int a = 0; a < array_len; a++) { @@ -771,7 +774,7 @@ static void cast_primitive_type(const eSDNA_Type old_type, case SDNA_TYPE_SHORT: { const short value = *((short *)old_data); old_value_i = value; - old_value_f = (double)old_value_i; + old_value_f = (double)(int64_t)old_value_i; break; } case SDNA_TYPE_USHORT: { @@ -783,7 +786,7 @@ static void cast_primitive_type(const eSDNA_Type old_type, case SDNA_TYPE_INT: { const int value = *((int *)old_data); old_value_i = value; - old_value_f = (double)old_value_i; + old_value_f = (double)(int64_t)old_value_i; break; } case SDNA_TYPE_FLOAT: { @@ -801,7 +804,7 @@ static void cast_primitive_type(const eSDNA_Type old_type, case SDNA_TYPE_INT64: { const int64_t value = *((int64_t *)old_data); old_value_i = (uint64_t)value; - old_value_f = (double)old_value_i; + old_value_f = (double)(int64_t)old_value_i; break; } case SDNA_TYPE_UINT64: { @@ -813,7 +816,7 @@ static void cast_primitive_type(const eSDNA_Type old_type, case SDNA_TYPE_INT8: { const int8_t value = *((int8_t *)old_data); old_value_i = (uint64_t)value; - old_value_f = (double)old_value_i; + old_value_f = (double)(int64_t)old_value_i; } } |