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/* See LICENSE file for copyright and license details. */
#include "common.h"
int
feedbuffer(int fd, struct buffer *buffer, const char *fname)
{
ssize_t r;
if (buffer->offset == buffer->size)
buffer->buf = erealloc(buffer->buf, buffer->size += 8096);
again:
r = read(fd, &buffer->buf[buffer->offset], buffer->size - buffer->offset);
if (r <= 0) {
if (!r)
return 1;
if (errno == EINTR)
goto again;
weprintf("%s:", fname);
return -1;
}
buffer->offset += (size_t)r;
return 0;
}
void
shiftbuffer(struct algorithm *algorithms, size_t nalgorithms, struct buffer *buffer)
{
size_t i, consumed = SIZE_MAX;
for (i = 0; i < nalgorithms; i++)
consumed = MIN(consumed, algorithms[i].offset);
if (!consumed)
return;
for (i = 0; i < nalgorithms; i++)
algorithms[i].offset -= consumed;
memmove(&buffer->buf[0], &buffer->buf[consumed], buffer->ready -= consumed);
memmove(&buffer->buf[buffer->ready], &buffer->buf[buffer->procoff], buffer->offset - buffer->procoff);
buffer->offset -= buffer->procoff - buffer->ready;
buffer->procoff = buffer->ready;
}
int
unhex(struct buffer *buffer)
{
size_t i = buffer->procoff;
char a, b;
for (;;) {
while (i < buffer->offset && isspace(buffer->buf[i]))
i++;
if (i == buffer->offset)
break;
buffer->procoff = i;
if (!isxdigit(buffer->buf[i]))
return -1;
a = buffer->buf[i++];
while (i < buffer->offset && isspace(buffer->buf[i]))
i++;
if (i == buffer->offset)
break;
if (!isxdigit(buffer->buf[i]))
return -1;
b = buffer->buf[i++];
buffer->procoff = i;
a = (char)((a & 15) + (a > '9' ? 9 : 0));
b = (char)((b & 15) + (b > '9' ? 9 : 0));
a <<= 4;
a |= b;
buffer->buf[buffer->ready++] = a;
}
return 0;
}
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