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[ObjC] Remove OSReadLittle* due to alignment requirements #6678

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Sep 20, 2019
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[ObjC] Remove OSReadLittle* due to alignment requirements #6678

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12 changes: 10 additions & 2 deletions objectivec/GPBCodedInputStream.m
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Original file line number Diff line number Diff line change
Expand Up @@ -93,14 +93,22 @@ static int8_t ReadRawByte(GPBCodedInputStreamState *state) {

static int32_t ReadRawLittleEndian32(GPBCodedInputStreamState *state) {
CheckSize(state, sizeof(int32_t));
int32_t value = OSReadLittleInt32(state->bytes, state->bufferPos);
// Not using OSReadLittleInt32 because it has undocumented dependency
// on reads being aligned.
int32_t value;
memcpy(&value, state->bytes + state->bufferPos, sizeof(int32_t));
value = OSSwapLittleToHostInt32(value);
state->bufferPos += sizeof(int32_t);
return value;
}

static int64_t ReadRawLittleEndian64(GPBCodedInputStreamState *state) {
CheckSize(state, sizeof(int64_t));
int64_t value = OSReadLittleInt64(state->bytes, state->bufferPos);
// Not using OSReadLittleInt64 because it has undocumented dependency
// on reads being aligned.
int64_t value;
memcpy(&value, state->bytes + state->bufferPos, sizeof(int64_t));
value = OSSwapLittleToHostInt64(value);
state->bufferPos += sizeof(int64_t);
return value;
}
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