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Add virtual read() support to the bufRead class to speed up encoding/decoding via the zpaq library.

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This commit is contained in:
Con Kolivas 2012-03-16 22:27:01 +11:00
parent a55250cf16
commit 4d48717949
1 changed files with 18 additions and 0 deletions
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18
libzpaq/libzpaq.h
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@ -31,6 +31,7 @@ comprises the reference decoder for the ZPAQ level 2 standard.
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
namespace libzpaq {
@ -444,6 +445,7 @@ struct bufRead: public libzpaq::Reader {
uchar *s_buf;
long long *s_len;
bufRead(uchar *buf_, long long *n_): s_buf(buf_), s_len(n_) {}
int get() {
if (*s_len > 0) {
(*s_len)--;
@ -451,6 +453,22 @@ struct bufRead: public libzpaq::Reader {
}
return -1;
} // read and return byte 0..255, or -1 at EOF
int read(char *buf, int n) {
int diff;
if (*s_len < 1)
return -1;
if (n > *s_len)
diff = *s_len;
else
diff = *s_len - n;
*s_len -= diff;
memcpy(buf, s_buf, diff);
return diff;
}
};
struct bufWrite: public libzpaq::Writer {