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Avoid copying data into circular buffer

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--HG--
branch : nocircbuffer
This commit is contained in:
Matt Johnston
2015-03-01 00:44:45 +08:00
parent 3113932151
commit 989c5c1436
4 changed files with 95 additions and 12 deletions
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17
circbuffer.c
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@@ -110,6 +110,21 @@ unsigned char* cbuf_readptr(circbuffer *cbuf, unsigned int len) {
return &cbuf->data[cbuf->readpos];
}
void cbuf_readptrs(circbuffer *cbuf,
unsigned char **p1, unsigned int *len1,
unsigned char **p2, unsigned int *len2) {
*p1 = &cbuf->data[cbuf->readpos];
*len1 = MIN(cbuf->used, cbuf->size - cbuf->readpos);
if (*len1 < cbuf->used) {
*p2 = cbuf->data;
*len2 = cbuf->used - *len1;
} else {
*p2 = NULL;
*len2 = 0;
}
}
unsigned char* cbuf_writeptr(circbuffer *cbuf, unsigned int len) {
if (len > cbuf_writelen(cbuf)) {
@@ -131,9 +146,11 @@ void cbuf_incrwrite(circbuffer *cbuf, unsigned int len) {
void cbuf_incrread(circbuffer *cbuf, unsigned int len) {
#if 0
if (len > cbuf_readlen(cbuf)) {
dropbear_exit("Bad cbuf read");
}
#endif
dropbear_assert(cbuf->used >= len);
cbuf->used -= len;