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/* Copyright (C) 2007-2008 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
*/
#include "cbuffer.h"
#include "android/utils/stralloc.h"
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#define DEBUG 0
#if DEBUG
# define ASSERT(cond,fmt,...) ({ if (!(cond)) { fprintf(stderr, fmt, __VA_ARGS__); assert(cond); } })
#else
# define ASSERT(cond,fmt,...) ((void)0)
#endif
#if DEBUG
void
cbuffer_assert( CBuffer* cb, const char* file, long lineno )
{
const char* reason = NULL;
if (cb->rpos < 0 || cb->rpos >= cb->size) {
reason = "rpos is out of bounds";
}
else if (cb->count < 0 || cb->count > cb->size) {
reason = "count is incorrect";
}
if (!reason)
return;
fprintf(stderr, "assert:%s:%ld: assertion failed: %s (pos=%d count=%d size=%d)\n",
file, lineno, reason, cb->rpos, cb->count, cb->size);
assert(0);
}
# define CBUFFER_ASSERT(cb) cbuffer_assert(cb,__FUNCTION__,__LINE__)
#else
# define CBUFFER_ASSERT(cb) ((void)0)
#endif
int
cbuffer_write_peek( CBuffer* cb, uint8_t* *pbase )
{
int wpos = cb->rpos + cb->count;
int avail = cb->size - cb->count;
CBUFFER_ASSERT(cb);
if (wpos >= cb->size)
wpos -= cb->size;
if (wpos + avail > cb->size)
avail = cb->size - wpos;
*pbase = cb->buff + wpos;
return avail;
}
void
cbuffer_write_step( CBuffer* cb, int len )
{
CBUFFER_ASSERT(cb);
cb->count += len;
if (cb->count > cb->size)
cb->count = cb->size;
}
int
cbuffer_write( CBuffer* cb, const void* from, int len )
{
int len2 = len;
CBUFFER_ASSERT(cb);
while (len2 > 0) {
int avail = cb->size - cb->count;
int wpos = cb->rpos + cb->count;
ASSERT(avail >= 0, "avail is negative: %d", avail);
if (avail == 0)
break;
if (wpos >= cb->size)
wpos -= cb->size;
ASSERT( wpos >= 0 && wpos < cb->size, "wpos is out-of-bounds: %d (rpos=%d)", wpos, cb->rpos);
if (wpos + avail > cb->size)
avail = cb->size - wpos;
if (avail > len2)
avail = len2;
memcpy( cb->buff + wpos, (const char*)from, avail );
from = (char*)from + avail;
len2 -= avail;
cb->count += avail;
}
return len - len2;
}
int
cbuffer_read( CBuffer* cb, void* to, int len )
{
int len2 = len;
CBUFFER_ASSERT(cb);
while (len2 > 0) {
int avail = cb->count;
int rpos = cb->rpos;
ASSERT(avail >= 0, "avail is negative: %d", avail);
if (avail == 0)
break;
ASSERT((rpos >= 0 && rpos < cb->size), "rpos is out-of-bounds: %d", rpos);
if (rpos+avail > cb->size)
avail = cb->size - rpos;
if (avail > len2)
avail = len2;
memcpy( (char*)to, (const char*)cb->buff + rpos, avail );
to = (char*)to + avail;
len2 -= avail;
cb->count -= avail;
cb->rpos += avail;
if (cb->rpos >= cb->size)
cb->rpos -= cb->size;
}
return len - len2;
}
int
cbuffer_read_peek( CBuffer* cb, uint8_t* *pbase )
{
int rpos = cb->rpos;
int avail = cb->count;
CBUFFER_ASSERT(cb);
if (rpos + avail > cb->size)
avail = cb->size - rpos;
*pbase = cb->buff + rpos;
return avail;
}
void
cbuffer_read_step( CBuffer* cb, int len )
{
CBUFFER_ASSERT(cb);
if (len > cb->count)
len = cb->count;
cb->rpos += len;
if (cb->rpos >= cb->size)
cb->rpos -= cb->size;
cb->count -= len;
}
const char*
cbuffer_quote( CBuffer* cb )
{
STRALLOC_DEFINE(s);
char* q;
stralloc_format( s, "cbuffer %p (pos=%d count=%d size=%d)",
cb, cb->rpos, cb->count, cb->size );
q = stralloc_to_tempstr( s );
stralloc_reset(s);
return q;
}
const char*
cbuffer_quote_data( CBuffer* cb )
{
STRALLOC_DEFINE(s);
int len = cb->count;
int rpos = cb->rpos;
char* result;
while (len > 0) {
int avail = len;
if (rpos >= cb->size)
rpos -= cb->size;
if (rpos + avail > cb->size)
avail = cb->size - rpos;
stralloc_add_quote_bytes( s, cb->buff + rpos, avail );
rpos += avail;
len -= avail;
}
result = stralloc_to_tempstr(s);
stralloc_reset(s);
return result;
}
void
cbuffer_print( CBuffer* cb )
{
/* print the content of a cbuffer */
printf( "%s: %s", cbuffer_quote(cb), cbuffer_quote_data(cb) );
}
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