| David Reiss | ac54955 | 2008-06-10 22:56:59 +0000 | [diff] [blame^] | 1 | -module(thrift_protocol). |
| 2 | |
| 3 | -export([new/2, |
| 4 | write/2, |
| 5 | read/2, |
| 6 | skip/2, |
| 7 | |
| 8 | typeid_to_atom/1, |
| 9 | |
| 10 | behaviour_info/1]). |
| 11 | |
| 12 | -include("thrift_constants.hrl"). |
| 13 | -include("thrift_protocol.hrl"). |
| 14 | |
| 15 | -record(protocol, {module, data}). |
| 16 | |
| 17 | behaviour_info(callbacks) -> |
| 18 | [ |
| 19 | {read, 2}, |
| 20 | {write, 2} |
| 21 | ]; |
| 22 | behaviour_info(_Else) -> undefined. |
| 23 | |
| 24 | |
| 25 | new(Module, Data) when is_atom(Module) -> |
| 26 | {ok, #protocol{module = Module, |
| 27 | data = Data}}. |
| 28 | |
| 29 | |
| 30 | write(#protocol{module = Module, |
| 31 | data = ModuleData}, Data) -> |
| 32 | Module:write(ModuleData, Data). |
| 33 | |
| 34 | typeid_to_atom(?tType_STOP) -> field_stop; |
| 35 | typeid_to_atom(?tType_VOID) -> void; |
| 36 | typeid_to_atom(?tType_BOOL) -> bool; |
| 37 | typeid_to_atom(?tType_BYTE) -> byte; |
| 38 | typeid_to_atom(?tType_DOUBLE) -> double; |
| 39 | typeid_to_atom(?tType_I16) -> i16; |
| 40 | typeid_to_atom(?tType_I32) -> i32; |
| 41 | typeid_to_atom(?tType_I64) -> i64; |
| 42 | typeid_to_atom(?tType_STRING) -> string; |
| 43 | typeid_to_atom(?tType_STRUCT) -> struct; |
| 44 | typeid_to_atom(?tType_MAP) -> map; |
| 45 | typeid_to_atom(?tType_SET) -> set; |
| 46 | typeid_to_atom(?tType_LIST) -> list. |
| 47 | |
| 48 | read(#protocol{module = Module, |
| 49 | data = ModuleData}, ProtocolType) -> |
| 50 | Module:read(ModuleData, ProtocolType). |
| 51 | |
| 52 | |
| 53 | |
| 54 | skip(Proto, struct) -> |
| 55 | ok = read(Proto, struct_begin), |
| 56 | ok = skip_struct_loop(Proto), |
| 57 | ok = read(Proto, struct_end); |
| 58 | |
| 59 | skip(Proto, map) -> |
| 60 | Map = read(Proto, map_begin), |
| 61 | ok = skip_map_loop(Proto, Map), |
| 62 | ok = read(Proto, map_end); |
| 63 | |
| 64 | skip(Proto, set) -> |
| 65 | Set = read(Proto, set_begin), |
| 66 | ok = skip_set_loop(Proto, Set), |
| 67 | ok = read(Proto, set_end); |
| 68 | |
| 69 | skip(Proto, list) -> |
| 70 | List = read(Proto, list_begin), |
| 71 | ok = skip_list_loop(Proto, List), |
| 72 | ok = read(Proto, list_end); |
| 73 | |
| 74 | skip(Proto, Type) when is_atom(Type) -> |
| 75 | _Ignore = read(Proto, Type), |
| 76 | ok. |
| 77 | |
| 78 | |
| 79 | skip_struct_loop(Proto) -> |
| 80 | #protocol_field_begin{type = Type} = read(Proto, field_begin), |
| 81 | case Type of |
| 82 | ?tType_STOP -> |
| 83 | ok; |
| 84 | _Else -> |
| 85 | skip(Proto, Type), |
| 86 | ok = read(Proto, field_end), |
| 87 | skip_struct_loop(Proto) |
| 88 | end. |
| 89 | |
| 90 | skip_map_loop(Proto, Map = #protocol_map_begin{ktype = Ktype, |
| 91 | vtype = Vtype, |
| 92 | size = Size}) -> |
| 93 | case Size of |
| 94 | N when N > 0 -> |
| 95 | skip(Proto, Ktype), |
| 96 | skip(Proto, Vtype), |
| 97 | skip_map_loop(Proto, |
| 98 | Map#protocol_map_begin{size = Size - 1}); |
| 99 | 0 -> ok |
| 100 | end. |
| 101 | |
| 102 | skip_set_loop(Proto, Map = #protocol_set_begin{etype = Etype, |
| 103 | size = Size}) -> |
| 104 | case Size of |
| 105 | N when N > 0 -> |
| 106 | skip(Proto, Etype), |
| 107 | skip_set_loop(Proto, |
| 108 | Map#protocol_set_begin{size = Size - 1}); |
| 109 | 0 -> ok |
| 110 | end. |
| 111 | |
| 112 | skip_list_loop(Proto, Map = #protocol_list_begin{etype = Etype, |
| 113 | size = Size}) -> |
| 114 | case Size of |
| 115 | N when N > 0 -> |
| 116 | skip(Proto, Etype), |
| 117 | skip_list_loop(Proto, |
| 118 | Map#protocol_list_begin{size = Size - 1}); |
| 119 | 0 -> ok |
| 120 | end. |