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Util: Add CircleBufferWrite

This commit is contained in:
Vicki Pfau 2017-03-21 22:30:30 -07:00
parent ab663a24a8
commit 1de5d4e330
2 changed files with 29 additions and 0 deletions
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1
include/mgba-util/circle-buffer.h
View File

@ -29,6 +29,7 @@ int CircleBufferWrite32(struct CircleBuffer* buffer, int32_t value);
int CircleBufferRead8(struct CircleBuffer* buffer, int8_t* value);
int CircleBufferRead16(struct CircleBuffer* buffer, int16_t* value);
int CircleBufferRead32(struct CircleBuffer* buffer, int32_t* value);
size_t CircleBufferWrite(struct CircleBuffer* buffer, const void* input, size_t length);
size_t CircleBufferRead(struct CircleBuffer* buffer, void* output, size_t length);
size_t CircleBufferDump(const struct CircleBuffer* buffer, void* output, size_t length);

28
src/util/circle-buffer.c
View File

@ -205,6 +205,34 @@ int CircleBufferRead32(struct CircleBuffer* buffer, int32_t* value) {
return 4;
}
size_t CircleBufferWrite(struct CircleBuffer* buffer, const void* input, size_t length) {
int8_t* data = buffer->writePtr;
if (buffer->size + length > buffer->capacity) {
return 0;
}
size_t remaining = buffer->capacity - ((int8_t*) data - (int8_t*) buffer->data);
if (length <= remaining) {
memcpy(data, input, length);
if (length == remaining) {
buffer->writePtr = buffer->data;
} else {
buffer->writePtr = (int8_t*) data + length;
}
} else {
memcpy(data, input, remaining);
memcpy(buffer->data, (int8_t*) input + remaining, length - remaining);
buffer->writePtr = (int8_t*) buffer->data + length - remaining;
}
buffer->size += length;
#ifndef NDEBUG
if (!_checkIntegrity(buffer)) {
abort();
}
#endif
return length;
}
size_t CircleBufferRead(struct CircleBuffer* buffer, void* output, size_t length) {
int8_t* data = buffer->readPtr;
if (buffer->size == 0) {