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#include "fitz-internal.h"
fz_stream *
fz_new_stream(fz_context *ctx, void *state,
int(*read)(fz_stream *stm, unsigned char *buf, int len),
void(*close)(fz_context *ctx, void *state))
{
fz_stream *stm;
fz_try(ctx)
{
stm = fz_malloc_struct(ctx, fz_stream);
}
fz_catch(ctx)
{
close(ctx, state);
fz_rethrow(ctx);
}
stm->refs = 1;
stm->error = 0;
stm->eof = 0;
stm->pos = 0;
stm->bits = 0;
stm->avail = 0;
stm->locked = 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 = NULL;
stm->ctx = ctx;
return stm;
}
void
fz_lock_stream(fz_stream *stm)
{
if (stm)
{
fz_lock(stm->ctx, FZ_LOCK_FILE);
stm->locked = 1;
}
}
fz_stream *
fz_keep_stream(fz_stream *stm)
{
stm->refs ++;
return stm;
}
void
fz_close(fz_stream *stm)
{
if (!stm)
return;
stm->refs --;
if (stm->refs == 0)
{
if (stm->close)
stm->close(stm->ctx, stm->state);
if (stm->locked)
fz_unlock(stm->ctx, FZ_LOCK_FILE);
fz_free(stm->ctx, stm);
}
}
/* File stream */
static int read_file(fz_stream *stm, unsigned char *buf, int len)
{
int n = read(*(int*)stm->state, buf, len);
fz_assert_lock_held(stm->ctx, FZ_LOCK_FILE);
if (n < 0)
fz_throw(stm->ctx, "read error: %s", strerror(errno));
return n;
}
static void seek_file(fz_stream *stm, int offset, int whence)
{
int n = lseek(*(int*)stm->state, offset, whence);
fz_assert_lock_held(stm->ctx, FZ_LOCK_FILE);
if (n < 0)
fz_throw(stm->ctx, "cannot lseek: %s", strerror(errno));
stm->pos = n;
stm->rp = stm->bp;
stm->wp = stm->bp;
}
static void close_file(fz_context *ctx, void *state)
{
int n = close(*(int*)state);
if (n < 0)
fz_warn(ctx, "close error: %s", strerror(errno));
fz_free(ctx, state);
}
fz_stream *
fz_open_fd(fz_context *ctx, int fd)
{
fz_stream *stm;
int *state;
state = fz_malloc_struct(ctx, int);
*state = fd;
fz_try(ctx)
{
stm = fz_new_stream(ctx, state, read_file, close_file);
}
fz_catch(ctx)
{
fz_free(ctx, state);
fz_rethrow(ctx);
}
stm->seek = seek_file;
return stm;
}
fz_stream *
fz_open_file(fz_context *ctx, const char *name)
{
int fd = open(name, O_BINARY | O_RDONLY, 0);
if (fd == -1)
fz_throw(ctx, "cannot open %s", name);
return fz_open_fd(ctx, fd);
}
#ifdef _WIN32
fz_stream *
fz_open_file_w(fz_context *ctx, const wchar_t *name)
{
int fd = _wopen(name, O_BINARY | O_RDONLY, 0);
if (fd == -1)
return NULL;
return fz_open_fd(ctx, fd);
}
#endif
/* Memory stream */
static int read_buffer(fz_stream *stm, unsigned char *buf, int len)
{
return 0;
}
static void seek_buffer(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->ep - offset;
stm->rp = CLAMP(stm->rp, stm->bp, stm->ep);
stm->wp = stm->ep;
}
static void close_buffer(fz_context *ctx, void *state_)
{
fz_buffer *state = (fz_buffer *)state_;
if (state)
fz_drop_buffer(ctx, state);
}
fz_stream *
fz_open_buffer(fz_context *ctx, fz_buffer *buf)
{
fz_stream *stm;
fz_keep_buffer(ctx, buf);
stm = fz_new_stream(ctx, buf, read_buffer, close_buffer);
stm->seek = seek_buffer;
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;
}
fz_stream *
fz_open_memory(fz_context *ctx, unsigned char *data, int len)
{
fz_stream *stm;
stm = fz_new_stream(ctx, NULL, read_buffer, close_buffer);
stm->seek = seek_buffer;
stm->bp = data;
stm->rp = data;
stm->wp = data + len;
stm->ep = data + len;
stm->pos = len;
return stm;
}
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