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#include "fitz.h"
int
fz_read(fz_stream *stm, unsigned char *buf, int len)
{
int count, n;
count = MIN(len, stm->wp - stm->rp);
if (count)
{
memcpy(buf, stm->rp, count);
stm->rp += count;
}
if (count == len || stm->error || stm->eof)
return count;
assert(stm->rp == stm->wp);
if (len - count < stm->ep - stm->bp)
{
n = stm->read(stm, stm->bp, stm->ep - stm->bp);
if (n < 0)
{
stm->error = 1;
return fz_rethrow(n, "read error");
}
else if (n == 0)
{
stm->eof = 1;
}
else if (n > 0)
{
stm->rp = stm->bp;
stm->wp = stm->bp + n;
stm->pos += n;
}
n = MIN(len - count, stm->wp - stm->rp);
if (n)
{
memcpy(buf + count, stm->rp, n);
stm->rp += n;
count += n;
}
}
else
{
n = stm->read(stm, buf + count, len - count);
if (n < 0)
{
stm->error = 1;
return fz_rethrow(n, "read error");
}
else if (n == 0)
{
stm->eof = 1;
}
else if (n > 0)
{
stm->pos += n;
count += n;
}
}
return count;
}
void
fz_fill_buffer(fz_stream *stm)
{
int n;
assert(stm->rp == stm->wp);
if (stm->error || stm->eof)
return;
n = stm->read(stm, stm->bp, stm->ep - stm->bp);
if (n < 0)
{
stm->error = 1;
fz_catch(n, "read error; treating as end of file");
}
else if (n == 0)
{
stm->eof = 1;
}
else if (n > 0)
{
stm->rp = stm->bp;
stm->wp = stm->bp + n;
stm->pos += n;
}
}
fz_error
fz_read_all(fz_buffer **bufp, fz_stream *stm, int initial)
{
fz_buffer *buf;
int n;
if (initial < 1024)
initial = 1024;
buf = fz_new_buffer(initial);
while (1)
{
if (buf->len == buf->cap)
fz_grow_buffer(buf);
if (buf->len / 200 > initial)
{
fz_drop_buffer(buf);
return fz_throw("compression bomb detected");
}
n = fz_read(stm, buf->data + buf->len, buf->cap - buf->len);
if (n < 0)
{
fz_drop_buffer(buf);
return fz_rethrow(n, "read error");
}
if (n == 0)
break;
buf->len += n;
}
*bufp = buf;
return fz_okay;
}
void
fz_read_line(fz_stream *stm, char *mem, int n)
{
char *s = mem;
int c = EOF;
while (n > 1)
{
c = fz_read_byte(stm);
if (c == EOF)
break;
if (c == '\r') {
c = fz_peek_byte(stm);
if (c == '\n')
fz_read_byte(stm);
break;
}
if (c == '\n')
break;
*s++ = c;
n--;
}
if (n)
*s = '\0';
}
int
fz_tell(fz_stream *stm)
{
return stm->pos - (stm->wp - stm->rp);
}
void
fz_seek(fz_stream *stm, int offset, int whence)
{
if (stm->seek)
{
if (whence == 1)
{
offset = fz_tell(stm) + offset;
whence = 0;
}
if (whence == 0)
{
unsigned char *p = stm->wp - (stm->pos - offset);
if (p >= stm->bp && p <= stm->wp)
{
stm->rp = p;
stm->eof = 0;
return;
}
}
stm->seek(stm, offset, whence);
stm->eof = 0;
}
else if (whence != 2)
{
if (whence == 0)
offset -= fz_tell(stm);
if (offset < 0)
fz_warn("cannot seek backwards");
/* dog slow, but rare enough */
while (offset-- > 0)
fz_read_byte(stm);
}
else
fz_warn("cannot seek");
}
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