mini_descriptor/internal/decoder.h

0001 // Protocol Buffers - Google's data interchange format
0002 // Copyright 2023 Google LLC.  All rights reserved.
0003 //
0004 // Use of this source code is governed by a BSD-style
0005 // license that can be found in the LICENSE file or at
0006 // https://developers.google.com/open-source/licenses/bsd
0007
0008 #ifndef UPB_MINI_DESCRIPTOR_INTERNAL_DECODER_H_
0009 #define UPB_MINI_DESCRIPTOR_INTERNAL_DECODER_H_
0010
0011 #include "upb/base/status.h"
0012 #include "upb/mini_descriptor/internal/base92.h"
0013
0014 // Must be last.
0015 #include "upb/port/def.inc"
0016
0017 // upb_MdDecoder: used internally for decoding MiniDescriptors for messages,
0018 // extensions, and enums.
0019 typedef struct {
0020   const char* end;
0021   upb_Status* status;
0022   jmp_buf err;
0023 } upb_MdDecoder;
0024
0025 UPB_PRINTF(2, 3)
0026 UPB_NORETURN UPB_INLINE void upb_MdDecoder_ErrorJmp(upb_MdDecoder* d,
0027                                                     const char* fmt, ...) {
0028   if (d->status) {
0029     va_list argp;
0030     upb_Status_SetErrorMessage(d->status, "Error building mini table: ");
0031     va_start(argp, fmt);
0032     upb_Status_VAppendErrorFormat(d->status, fmt, argp);
0033     va_end(argp);
0034   }
0035   UPB_LONGJMP(d->err, 1);
0036 }
0037
0038 UPB_INLINE void upb_MdDecoder_CheckOutOfMemory(upb_MdDecoder* d,
0039                                                const void* ptr) {
0040   if (!ptr) upb_MdDecoder_ErrorJmp(d, "Out of memory");
0041 }
0042
0043 UPB_INLINE const char* upb_MdDecoder_DecodeBase92Varint(
0044     upb_MdDecoder* d, const char* ptr, char first_ch, uint8_t min, uint8_t max,
0045     uint32_t* out_val) {
0046   ptr = _upb_Base92_DecodeVarint(ptr, d->end, first_ch, min, max, out_val);
0047   if (!ptr) upb_MdDecoder_ErrorJmp(d, "Overlong varint");
0048   return ptr;
0049 }
0050
0051 #include "upb/port/undef.inc"
0052
0053 #endif  // UPB_MINI_DESCRIPTOR_INTERNAL_DECODER_H_