On 11/14/2013 12:38 AM, Christian Ruppert wrote:
> diff --git a/lib/decompress_copy.c b/lib/decompress_copy.c
> new file mode 100644
> index 0000000..8a41090
> --- /dev/null
> +++ b/lib/decompress_copy.c
> @@ -0,0 +1,47 @@
> +#include <linux/decompress/mm.h>
> +
> +#define NOZIP_BUFSZ (16 * 1024)
> +STATIC int INIT nozip(unsigned char *buf, int len,
> + int(*fill)(void*, unsigned int),
> + int(*flush)(void*, unsigned int),
> + unsigned char *outbuf,
> + int *pos,
> + void(*error)(char *x))
> +{
> + char *b;
> +
> + if (buf)
> + b = buf;
> + else
> + b = malloc(NOZIP_BUFSZ);
> +
> + if (!b) {
> + error("Out of memory while allocating buffer");
> + return -1;
> + }
> +
> + if (flush) {
> + if (!len)
> + len = fill(b, NOZIP_BUFSZ);
> +
> + len = flush(b, len);
> + } else {
> + if (!len)
> + len = fill(outbuf, NOZIP_BUFSZ);
> + else {
> + int i;
> + for (i = 0; i < len; i++)
> + outbuf[i] = b[i];
Clever way of doing memcpy(). I know some other compression
implementations open-code memmove(), but using it for the entire data
set in the most common case is atrocious. If we need to get a default
implementation of memmove() we should just do that.
-hpa
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