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#include "fitz.h"
fz_stream *
fz_newstream(void *state,
int(*read)(fz_stream *stm, unsigned char *buf, int len),
void(*close)(fz_stream *stm))
{
fz_stream *stm;
stm = fz_malloc(sizeof(fz_stream));
stm->refs = 1;
stm->dead = 0;
stm->pos = 0;
stm->bp = stm->buf;
stm->rp = stm->bp;
stm->wp = stm->bp;
stm->ep = stm->buf + sizeof stm->buf;
stm->state = state;
stm->read = read;
stm->close = close;
stm->seek = nil;
return stm;
}
fz_stream *
fz_keepstream(fz_stream *stm)
{
stm->refs ++;
return stm;
}
void
fz_close(fz_stream *stm)
{
stm->refs --;
if (stm->refs == 0)
{
if (stm->close)
stm->close(stm);
fz_free(stm);
}
}
/* File stream */
static int readfile(fz_stream *stm, unsigned char *buf, int len)
{
int n = read(*(int*)stm->state, buf, len);
if (n < 0)
return fz_throw("read error: %s", strerror(errno));
return n;
}
static void seekfile(fz_stream *stm, int offset, int whence)
{
int n = lseek(*(int*)stm->state, offset, whence);
if (n < 0)
fz_warn("cannot lseek: %s", strerror(errno));
stm->pos = n;
stm->rp = stm->bp;
stm->wp = stm->bp;
}
static void closefile(fz_stream *stm)
{
int n = close(*(int*)stm->state);
if (n < 0)
fz_warn("close error: %s", strerror(errno));
fz_free(stm->state);
}
fz_stream *
fz_openfile(int fd)
{
fz_stream *stm;
int *state;
state = fz_malloc(sizeof(int));
*state = fd;
stm = fz_newstream(state, readfile, closefile);
stm->seek = seekfile;
return stm;
}
/* Memory stream */
static int readbuffer(fz_stream *stm, unsigned char *buf, int len)
{
return 0;
}
static void seekbuffer(fz_stream *stm, int offset, int whence)
{
if (whence == 0)
stm->rp = stm->bp + offset;
if (whence == 1)
stm->rp += offset;
if (whence == 2)
stm->rp = stm->wp - offset;
stm->rp = CLAMP(stm->rp, stm->bp, stm->wp);
}
static void closebuffer(fz_stream *stm)
{
fz_dropbuffer(stm->state);
}
fz_stream *
fz_openbuffer(fz_buffer *buf)
{
fz_stream *stm;
stm = fz_newstream(fz_keepbuffer(buf), readbuffer, closebuffer);
stm->seek = seekbuffer;
stm->bp = buf->data;
stm->rp = buf->data;
stm->wp = buf->data + buf->len;
stm->ep = buf->data + buf->len;
stm->pos = buf->len;
return stm;
}
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