#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/fcntl.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include "xmalloc.h"
#include "buffer.h"
#include "ssh.h"
void
buffer_init(Buffer *buffer)
{
buffer->alloc = 4096;
buffer->buf = xmalloc(buffer->alloc);
buffer->offset = 0;
buffer->end = 0;
}
void
buffer_free(Buffer *buffer)
{
memset(buffer->buf, 0, buffer->alloc);
xfree(buffer->buf);
}
void
buffer_clear(Buffer *buffer)
{
buffer->offset = 0;
buffer->end = 0;
}
void
buffer_append(Buffer *buffer, const char *data, unsigned int len)
{
char *cp;
buffer_append_space(buffer, &cp, len);
memcpy(cp, data, len);
}
void
buffer_append_space(Buffer *buffer, char **datap, unsigned int len)
{
if (buffer->offset == buffer->end) {
buffer->offset = 0;
buffer->end = 0;
}
restart:
if (buffer->end + len < buffer->alloc) {
*datap = buffer->buf + buffer->end;
buffer->end += len;
return;
}
if (buffer->offset > buffer->alloc / 2) {
memmove(buffer->buf, buffer->buf + buffer->offset,
buffer->end - buffer->offset);
buffer->end -= buffer->offset;
buffer->offset = 0;
goto restart;
}
buffer->alloc += len + 32768;
buffer->buf = xrealloc(buffer->buf, buffer->alloc);
goto restart;
}
unsigned int
buffer_len(Buffer *buffer)
{
return buffer->end - buffer->offset;
}
void
buffer_get(Buffer *buffer, char *buf, unsigned int len)
{
if (len > buffer->end - buffer->offset)
fatal("buffer_get: trying to get more bytes than in buffer");
memcpy(buf, buffer->buf + buffer->offset, len);
buffer->offset += len;
}
void
buffer_consume(Buffer *buffer, unsigned int bytes)
{
if (bytes > buffer->end - buffer->offset)
fatal("buffer_consume: trying to get more bytes than in buffer");
buffer->offset += bytes;
}
void
buffer_consume_end(Buffer *buffer, unsigned int bytes)
{
if (bytes > buffer->end - buffer->offset)
fatal("buffer_consume_end: trying to get more bytes than in buffer");
buffer->end -= bytes;
}
char *
buffer_ptr(Buffer *buffer)
{
return buffer->buf + buffer->offset;
}
void
buffer_dump(Buffer *buffer)
{
#ifdef DEBUG
int i;
unsigned char *ucp = (unsigned char *) buffer->buf;
for (i = buffer->offset; i < buffer->end; i++)
fprintf(stderr, " %02x", ucp[i]);
fprintf(stderr, "\n");
#endif
}