c->out = dst + cnt;
}
+static inline void memcpy_backptr(uint8_t *dst, int back, int cnt);
+
/**
* \brief copy previously decoded bytes to current position
* \param back how many bytes back we start
cnt = FFMAX(c->out_end - dst, 0);
c->error |= LZO_OUTPUT_FULL;
}
+ memcpy_backptr(dst, back, cnt);
+ c->out = dst + cnt;
+}
+
+static inline void memcpy_backptr(uint8_t *dst, int back, int cnt) {
+ const uint8_t *src = &dst[-back];
if (back == 1) {
memset(dst, *src, cnt);
- dst += cnt;
} else {
#ifdef OUTBUF_PADDED
COPY2(dst, src);
}
memcpy(dst, src, cnt);
}
- dst += cnt;
}
- c->out = dst;
+}
+
+/**
+ * \brief deliberately overlapping memcpy implementation
+ * \param dst destination buffer; must be padded with 12 additional bytes
+ * \param back how many bytes back we start (the initial size of the overlapping window)
+ * \param cnt number of bytes to copy, must be >= 0
+ *
+ * cnt > back is valid, this will copy the bytes we just copied,
+ * thus creating a repeating pattern with a period length of back.
+ */
+void av_memcpy_backptr(uint8_t *dst, int back, int cnt) {
+ memcpy_backptr(dst, back, cnt);
}
/**
int lzo1x_decode(void *out, int *outlen, const void *in, int *inlen);
+void av_memcpy_backptr(uint8_t *dst, int back, int cnt);
+
#endif /* FFMPEG_LZO_H */