X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=pb_decode.c;h=b25f3f556be8abbdcc3b7951be727507ed64b1e6;hb=47b10ec0ab370475c51294707c0fe6e160046973;hp=8e01fd7aff36f27dc4ed2f62ebc5da832cb0a259;hpb=dcab39a41c0a403db38860c22426075e6ae9f25d;p=apps%2Fagl-service-can-low-level.git diff --git a/pb_decode.c b/pb_decode.c index 8e01fd7a..b25f3f55 100644 --- a/pb_decode.c +++ b/pb_decode.c @@ -39,16 +39,20 @@ static const pb_decoder_t PB_DECODERS[PB_LTYPES_COUNT] = { static bool checkreturn buf_read(pb_istream_t *stream, uint8_t *buf, size_t count) { uint8_t *source = (uint8_t*)stream->state; + stream->state = source + count; if (buf != NULL) - memcpy(buf, source, count); + { + while (count--) + *buf++ = *source++; + } - stream->state = source + count; return true; } bool checkreturn pb_read(pb_istream_t *stream, uint8_t *buf, size_t count) { +#ifndef PB_BUFFER_ONLY if (buf == NULL && stream->callback != buf_read) { /* Skip input bytes */ @@ -63,12 +67,18 @@ bool checkreturn pb_read(pb_istream_t *stream, uint8_t *buf, size_t count) return pb_read(stream, tmp, count); } +#endif if (stream->bytes_left < count) PB_RETURN_ERROR(stream, "end-of-stream"); +#ifndef PB_BUFFER_ONLY if (!stream->callback(stream, buf, count)) PB_RETURN_ERROR(stream, "io error"); +#else + if (!buf_read(stream, buf, count)) + return false; +#endif stream->bytes_left -= count; return true; @@ -77,9 +87,16 @@ bool checkreturn pb_read(pb_istream_t *stream, uint8_t *buf, size_t count) pb_istream_t pb_istream_from_buffer(uint8_t *buf, size_t bufsize) { pb_istream_t stream; +#ifdef PB_BUFFER_ONLY + stream.callback = NULL; +#else stream.callback = &buf_read; +#endif stream.state = buf; stream.bytes_left = bufsize; +#ifndef PB_NO_ERRMSG + stream.errmsg = NULL; +#endif return stream; } @@ -89,28 +106,60 @@ pb_istream_t pb_istream_from_buffer(uint8_t *buf, size_t bufsize) static bool checkreturn pb_decode_varint32(pb_istream_t *stream, uint32_t *dest) { - uint64_t temp; - bool status = pb_decode_varint(stream, &temp); - *dest = (uint32_t)temp; - return status; + uint8_t byte; + uint32_t result; + + if (!pb_read(stream, &byte, 1)) + return false; + + if (!(byte & 0x80)) + { + /* Quick case, 1 byte value */ + result = byte; + } + else + { + /* Multibyte case */ + uint8_t bitpos = 7; + result = byte & 0x7F; + + do + { + if (bitpos >= 32) + PB_RETURN_ERROR(stream, "varint overflow"); + + if (!pb_read(stream, &byte, 1)) + return false; + + result |= (uint32_t)(byte & 0x7F) << bitpos; + bitpos = (uint8_t)(bitpos + 7); + } while (byte & 0x80); + } + + *dest = result; + return true; } bool checkreturn pb_decode_varint(pb_istream_t *stream, uint64_t *dest) { uint8_t byte; - int bitpos = 0; - *dest = 0; + uint8_t bitpos = 0; + uint64_t result = 0; - while (bitpos < 64 && pb_read(stream, &byte, 1)) + do { - *dest |= (uint64_t)(byte & 0x7F) << bitpos; - bitpos += 7; + if (bitpos >= 64) + PB_RETURN_ERROR(stream, "varint overflow"); - if (!(byte & 0x80)) - return true; - } + if (!pb_read(stream, &byte, 1)) + return false; + + result |= (uint64_t)(byte & 0x7F) << bitpos; + bitpos = (uint8_t)(bitpos + 7); + } while (byte & 0x80); - PB_RETURN_ERROR(stream, "varint overflow"); + *dest = result; + return true; } bool checkreturn pb_skip_varint(pb_istream_t *stream) @@ -222,14 +271,18 @@ bool checkreturn pb_make_string_substream(pb_istream_t *stream, pb_istream_t *su void pb_close_string_substream(pb_istream_t *stream, pb_istream_t *substream) { stream->state = substream->state; + +#ifndef PB_NO_ERRMSG + stream->errmsg = substream->errmsg; +#endif } /* Iterator for pb_field_t list */ typedef struct { const pb_field_t *start; /* Start of the pb_field_t array */ const pb_field_t *current; /* Current position of the iterator */ - int field_index; /* Zero-based index of the field. */ - int required_field_index; /* Zero-based index that counts only the required fields */ + unsigned field_index; /* Zero-based index of the field. */ + unsigned required_field_index; /* Zero-based index that counts only the required fields */ void *dest_struct; /* Pointer to the destination structure to decode to */ void *pData; /* Pointer where to store current field value */ void *pSize; /* Pointer where to store the size of current array field */ @@ -275,7 +328,7 @@ static bool pb_field_next(pb_field_iterator_t *iter) static bool checkreturn pb_field_find(pb_field_iterator_t *iter, uint32_t tag) { - int start = iter->field_index; + unsigned start = iter->field_index; do { if (iter->current->tag == tag) @@ -470,15 +523,34 @@ bool checkreturn pb_decode_noinit(pb_istream_t *stream, const pb_field_t fields[ } /* Check that all required fields were present. */ - pb_field_init(&iter, fields, dest_struct); - do { - if (PB_HTYPE(iter.current->type) == PB_HTYPE_REQUIRED && - iter.required_field_index < PB_MAX_REQUIRED_FIELDS && - !(fields_seen[iter.required_field_index >> 3] & (1 << (iter.required_field_index & 7)))) + { + /* First figure out the number of required fields by + * seeking to the end of the field array. Usually we + * are already close to end after decoding. + */ + unsigned req_field_count; + pb_type_t last_type; + unsigned i; + do { + req_field_count = iter.required_field_index; + last_type = iter.current->type; + } while (pb_field_next(&iter)); + + /* Fixup if last field was also required. */ + if (PB_HTYPE(last_type) == PB_HTYPE_REQUIRED) + req_field_count++; + + /* Check the whole bytes */ + for (i = 0; i < (req_field_count >> 3); i++) { - PB_RETURN_ERROR(stream, "missing required field"); + if (fields_seen[i] != 0xFF) + PB_RETURN_ERROR(stream, "missing required field"); } - } while (pb_field_next(&iter)); + + /* Check the remaining bits */ + if (fields_seen[req_field_count >> 3] != (0xFF >> (8 - (req_field_count & 7)))) + PB_RETURN_ERROR(stream, "missing required field"); + } return true; }