bson: support all non-deprecated types and fix int/uint bugs

doc/formats.md

@@ -434,6 +434,10 @@ bplist> from_ns_keyed_archiver(1)
 
 ## bson
 
+Limitations:
+
+- The decimal128 type is not supported for decoding, will just be treated as binary
+
 ### Convert represented value to JSON
 
 ```

format/bson/bson.go

@@ -1,7 +1,6 @@
 package bson
 
 // https://bsonspec.org/spec.html
-// TODO: more types
 
 import (
 	"embed"
@@ -27,42 +26,50 @@ func init() {
 }
 
 const (
-	elementTypeDouble    = 0x01
-	elementTypeString    = 0x02
-	elementTypeDocument  = 0x03
-	elementTypeArray     = 0x04
-	elementTypeBinary    = 0x05
-	elementTypeUndefined = 0x06
-	elementTypeObjectID  = 0x07
-	elementTypeBoolean   = 0x08
-	elementTypeDatatime  = 0x09
-	elementTypeNull      = 0x0a
-	elementTypeRegexp    = 0x0b
-	elementTypeInt32     = 0x10
-	elementTypeTimestamp = 0x11
-	elementTypeInt64     = 0x12
+	elementTypeDouble     = 0x01
+	elementTypeString     = 0x02
+	elementTypeDocument   = 0x03
+	elementTypeArray      = 0x04
+	elementTypeBinary     = 0x05
+	elementTypeUndefined  = 0x06
+	elementTypeObjectID   = 0x07
+	elementTypeBoolean    = 0x08
+	elementTypeDatetime   = 0x09
+	elementTypeNull       = 0x0a
+	elementTypeRegexp     = 0x0b
+	elementTypeJavaScript = 0x0d
+	elementTypeInt32      = 0x10
+	elementTypeTimestamp  = 0x11
+	elementTypeInt64      = 0x12
+	elementTypeDecimal128 = 0x13
+	elementTypeMinKey     = 0xFF
+	elementTypeMaxKey     = 0x7f
 )
 
 var elementTypeMap = scalar.UintMap{
-	elementTypeDouble:    {Sym: "double", Description: "64-bit binary floating point"},
-	elementTypeString:    {Sym: "string", Description: "UTF-8 string"},
-	elementTypeDocument:  {Sym: "document", Description: "Embedded document"},
-	elementTypeArray:     {Sym: "array", Description: "Array"},
-	elementTypeBinary:    {Sym: "binary", Description: "Binary data"},
-	elementTypeUndefined: {Sym: "undefined", Description: "Undefined (deprecated)"},
-	elementTypeObjectID:  {Sym: "object_id", Description: "ObjectId"},
-	elementTypeBoolean:   {Sym: "boolean", Description: "Boolean"},
-	elementTypeDatatime:  {Sym: "datatime", Description: "UTC datetime"},
-	elementTypeNull:      {Sym: "null", Description: "Null value"},
-	elementTypeRegexp:    {Sym: "regexp", Description: "Regular expression"},
-	elementTypeInt32:     {Sym: "int32", Description: "32-bit integer"},
-	elementTypeTimestamp: {Sym: "timestamp", Description: "Timestamp"},
-	elementTypeInt64:     {Sym: "int64", Description: "64-bit integer"},
+	elementTypeDouble:     {Sym: "double", Description: "64-bit binary floating point"},
+	elementTypeString:     {Sym: "string", Description: "UTF-8 string"},
+	elementTypeDocument:   {Sym: "document", Description: "Embedded document"},
+	elementTypeArray:      {Sym: "array", Description: "Array"},
+	elementTypeBinary:     {Sym: "binary", Description: "Binary data"},
+	elementTypeUndefined:  {Sym: "undefined", Description: "Undefined (deprecated)"},
+	elementTypeObjectID:   {Sym: "object_id", Description: "ObjectId"},
+	elementTypeBoolean:    {Sym: "boolean", Description: "Boolean"},
+	elementTypeDatetime:   {Sym: "datetime", Description: "UTC datetime"},
+	elementTypeNull:       {Sym: "null", Description: "Null value"},
+	elementTypeRegexp:     {Sym: "regexp", Description: "Regular expression"},
+	elementTypeJavaScript: {Sym: "javascript", Description: "JavaScript code"},
+	elementTypeInt32:      {Sym: "int32", Description: "32-bit integer"},
+	elementTypeTimestamp:  {Sym: "timestamp", Description: "Timestamp"},
+	elementTypeInt64:      {Sym: "int64", Description: "64-bit integer"},
+	elementTypeDecimal128: {Sym: "decimal128", Description: "128-bit decimal floating point"},
+	elementTypeMinKey:     {Sym: "minkey", Description: "Min key"},
+	elementTypeMaxKey:     {Sym: "maxkey", Description: "Max key"},
 }
 
 func decodeBSONDocument(d *decode.D) {
-	size := d.FieldU32("size")
-	d.FramedFn(int64(size-4)*8, func(d *decode.D) {
+	size := d.FieldS32("size")
+	d.FramedFn((size-4)*8, func(d *decode.D) {
 		d.FieldArray("elements", func(d *decode.D) {
 			for d.BitsLeft() > 8 {
 				d.FieldStruct("element", func(d *decode.D) {
@@ -79,28 +86,38 @@ func decodeBSONDocument(d *decode.D) {
 					case elementTypeArray:
 						d.FieldStruct("value", decodeBSONDocument)
 					case elementTypeBinary:
-						length := d.FieldU32("length")
+						length := d.FieldS32("length")
 						d.FieldU8("subtype")
-						d.FieldRawLen("value", int64(length)*8)
+						d.FieldRawLen("value", length*8)
 					case elementTypeUndefined:
 						//deprecated
 					case elementTypeObjectID:
 						d.FieldRawLen("value", 12*8)
 					case elementTypeBoolean:
 						d.FieldU8("value")
-					case elementTypeDatatime:
-						d.FieldS32("value")
+					case elementTypeDatetime:
+						d.FieldS64("value")
 					case elementTypeNull:
 						d.FieldValueAny("value", nil)
 					case elementTypeRegexp:
 						d.FieldUTF8Null("value")
 						d.FieldUTF8Null("options")
+					case elementTypeJavaScript:
+						length := d.FieldS32("length")
+						d.FieldUTF8NullFixedLen("value", int(length))
 					case elementTypeInt32:
 						d.FieldS32("value")
 					case elementTypeTimestamp:
 						d.FieldU64("value")
 					case elementTypeInt64:
 						d.FieldS64("value")
+					case elementTypeDecimal128:
+						// TODO: Parse the IEEE 754 decimal128 value.
+						d.FieldRawLen("value", 128)
+					case elementTypeMinKey:
+						d.FieldValueAny("value", nil)
+					case elementTypeMaxKey:
+						d.FieldValueAny("value", nil)
 					default:
 						d.FieldRawLen("value", d.BitsLeft())
 					}