GPBWireFormat.m 3.6 KB

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  1. // Protocol Buffers - Google's data interchange format
  2. // Copyright 2008 Google Inc. All rights reserved.
  3. // https://developers.google.com/protocol-buffers/
  4. //
  5. // Redistribution and use in source and binary forms, with or without
  6. // modification, are permitted provided that the following conditions are
  7. // met:
  8. //
  9. // * Redistributions of source code must retain the above copyright
  10. // notice, this list of conditions and the following disclaimer.
  11. // * Redistributions in binary form must reproduce the above
  12. // copyright notice, this list of conditions and the following disclaimer
  13. // in the documentation and/or other materials provided with the
  14. // distribution.
  15. // * Neither the name of Google Inc. nor the names of its
  16. // contributors may be used to endorse or promote products derived from
  17. // this software without specific prior written permission.
  18. //
  19. // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20. // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21. // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22. // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23. // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24. // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25. // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26. // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27. // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28. // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29. // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30. #import "GPBWireFormat.h"
  31. #import "GPBUtilities_PackagePrivate.h"
  32. enum {
  33. GPBWireFormatTagTypeBits = 3,
  34. GPBWireFormatTagTypeMask = 7 /* = (1 << GPBWireFormatTagTypeBits) - 1 */,
  35. };
  36. uint32_t GPBWireFormatMakeTag(uint32_t fieldNumber, GPBWireFormat wireType) {
  37. return (fieldNumber << GPBWireFormatTagTypeBits) | wireType;
  38. }
  39. GPBWireFormat GPBWireFormatGetTagWireType(uint32_t tag) {
  40. return (GPBWireFormat)(tag & GPBWireFormatTagTypeMask);
  41. }
  42. uint32_t GPBWireFormatGetTagFieldNumber(uint32_t tag) {
  43. return GPBLogicalRightShift32(tag, GPBWireFormatTagTypeBits);
  44. }
  45. BOOL GPBWireFormatIsValidTag(uint32_t tag) {
  46. uint32_t formatBits = (tag & GPBWireFormatTagTypeMask);
  47. // The valid GPBWireFormat* values are 0-5, anything else is not a valid tag.
  48. BOOL result = (formatBits <= 5);
  49. return result;
  50. }
  51. GPBWireFormat GPBWireFormatForType(GPBDataType type, BOOL isPacked) {
  52. if (isPacked) {
  53. return GPBWireFormatLengthDelimited;
  54. }
  55. static const GPBWireFormat format[GPBDataType_Count] = {
  56. GPBWireFormatVarint, // GPBDataTypeBool
  57. GPBWireFormatFixed32, // GPBDataTypeFixed32
  58. GPBWireFormatFixed32, // GPBDataTypeSFixed32
  59. GPBWireFormatFixed32, // GPBDataTypeFloat
  60. GPBWireFormatFixed64, // GPBDataTypeFixed64
  61. GPBWireFormatFixed64, // GPBDataTypeSFixed64
  62. GPBWireFormatFixed64, // GPBDataTypeDouble
  63. GPBWireFormatVarint, // GPBDataTypeInt32
  64. GPBWireFormatVarint, // GPBDataTypeInt64
  65. GPBWireFormatVarint, // GPBDataTypeSInt32
  66. GPBWireFormatVarint, // GPBDataTypeSInt64
  67. GPBWireFormatVarint, // GPBDataTypeUInt32
  68. GPBWireFormatVarint, // GPBDataTypeUInt64
  69. GPBWireFormatLengthDelimited, // GPBDataTypeBytes
  70. GPBWireFormatLengthDelimited, // GPBDataTypeString
  71. GPBWireFormatLengthDelimited, // GPBDataTypeMessage
  72. GPBWireFormatStartGroup, // GPBDataTypeGroup
  73. GPBWireFormatVarint // GPBDataTypeEnum
  74. };
  75. return format[type];
  76. }