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#include <errno.h>
#include <string.h>
#include "crypto_buffer.h"
/* s->data_st must have been set */
/* after this s->e_ptr is updated */
static int allwrite(crypto_buffer *s)
{
u8 *buffer;
int w, bytes;
buffer = s->e_buffer;
bytes = s->data_st.bytes + (s->block_size << 1);
s->cipher(&s->ctx,(u8*)s->e_data,(u8*)&s->data_st);
while (bytes) {
w = s->op(s->fd,buffer,bytes);
if (w == -1) {
if (errno == EINTR) continue;
return -1; /* note that some data may have been written */
}
if (w == 0) ; /* luser's fault */
buffer += w;
bytes -= w;
}
s->e_ptr = (u8*)s->e_data + s->block_size;
return 0;
}
/* after this s->e_ptr and s->c_ptr are updated */
int crypto_buffer_flush(crypto_buffer *s)
{
register u32 len, len2;
register u8* e_ptr;
len = s->e_len;
e_ptr = s->e_ptr;
if(e_ptr == s->e_end) {
s->data_st.bytes = s->data_st.strlen = len;
if (allwrite(s) == -1) return -1;
e_ptr = s->e_ptr;
}
len2 = len = e_ptr + s->e_len - s->e_end; /* used bytes in e_buffer */
if(s->c_ptr != s->c_buffer){
s->cipher(&s->ctx, e_ptr, s->c_buffer);
len += s->block_size;
len2 += s->c_ptr - s->c_buffer;
}
s->data_st.bytes = len;
s->data_st.strlen = len2;
if (allwrite(s) == -1) return -1;
s->c_ptr = s->c_buffer;
return 0;
}
int crypto_buffer_put(crypto_buffer *s,const u8 *buf,u32 len)
{
register u32 size;
register u8* e_ptr;
register u8* e_end;
u32 free;
free = s->c_end - s->c_ptr;
if (len > free) {
if(free){
memcpy(s->c_ptr, buf, free);
buf += free;
len -= free;
}
/* now c_buffer is full */
e_ptr = s->e_ptr;
e_end = s->e_end;
size = s->block_size;
if(e_ptr == e_end) {
/* e_buffer full */
s->data_st.bytes = s->data_st.strlen = s->e_len;
if (allwrite(s) == -1) return -1;
e_ptr = s->e_ptr;
}
s->cipher(&s->ctx, e_ptr, s->c_buffer);
e_ptr += size;
s->c_ptr = s->c_buffer;
/* now c_buffer is empty */
while(len > size){
if(e_ptr == e_end) {
s->data_st.bytes = s->data_st.strlen = s->e_len;
if (allwrite(s) == -1) return -1;
e_ptr = s->e_ptr;
}
s->cipher(&s->ctx, e_ptr, buf);
e_ptr += size;
buf += size;
len -= size;
}
/* don't forget */
s->e_ptr = e_ptr;
}
/* now len < s->block_size + s->c_buffer - s->c_ptr */
if(len){
memcpy(s->c_ptr, buf, len);
s->c_ptr += len;
}
return 0;
}
int crypto_buffer_putflush(crypto_buffer *s,const u8 *buf,u32 len)
{
if (crypto_buffer_put(s, buf, len) == -1) return -1;
return crypto_buffer_flush(s);
}
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