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#include "mupdf/fitz.h"
fz_stream *
fz_new_stream(fz_context *ctx, void *state, fz_stream_next_fn *next, fz_stream_close_fn *close)
{
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->rp = NULL;
stm->wp = NULL;
stm->state = state;
stm->next = next;
stm->close = close;
stm->seek = NULL;
return stm;
}
fz_stream *
fz_keep_stream(fz_context *ctx, fz_stream *stm)
{
if (stm)
stm->refs ++;
return stm;
}
void
fz_drop_stream(fz_context *ctx, fz_stream *stm)
{
if (!stm)
return;
stm->refs --;
if (stm->refs == 0)
{
if (stm->close)
stm->close(ctx, stm->state);
fz_free(ctx, stm);
}
}
/* File stream */
typedef struct fz_file_stream_s
{
int file;
unsigned char buffer[4096];
} fz_file_stream;
static int next_file(fz_context *ctx, fz_stream *stm, int n)
{
fz_file_stream *state = stm->state;
/* n is only a hint, that we can safely ignore */
n = read(state->file, state->buffer, sizeof(state->buffer));
if (n < 0)
fz_throw(ctx, FZ_ERROR_GENERIC, "read error: %s", strerror(errno));
stm->rp = state->buffer;
stm->wp = state->buffer + n;
stm->pos += n;
if (n == 0)
return EOF;
return *stm->rp++;
}
static void seek_file(fz_context *ctx, fz_stream *stm, int offset, int whence)
{
fz_file_stream *state = stm->state;
int n = lseek(state->file, offset, whence);
if (n < 0)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot lseek: %s", strerror(errno));
stm->pos = n;
stm->rp = state->buffer;
stm->wp = state->buffer;
}
static void close_file(fz_context *ctx, void *state_)
{
fz_file_stream *state = state_;
int n = close(state->file);
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;
fz_file_stream *state = fz_malloc_struct(ctx, fz_file_stream);
state->file = fd;
fz_try(ctx)
{
stm = fz_new_stream(ctx, state, next_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)
{
#if defined(_WIN32) || defined(_WIN64)
char *s = (char*)name;
wchar_t *wname, *d;
int c, fd;
d = wname = fz_malloc(ctx, (strlen(name)+1) * sizeof(wchar_t));
while (*s) {
s += fz_chartorune(&c, s);
*d++ = c;
}
*d = 0;
fd = _wopen(wname, O_BINARY | O_RDONLY, 0);
fz_free(ctx, wname);
#else
int fd = open(name, O_BINARY | O_RDONLY, 0);
#endif
if (fd == -1)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot open %s", name);
return fz_open_fd(ctx, fd);
}
#if defined(_WIN32) || defined(_WIN64)
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)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot open file %ls", name);
return fz_open_fd(ctx, fd);
}
#endif
/* Memory stream */
static int next_buffer(fz_context *ctx, fz_stream *stm, int max)
{
return EOF;
}
static void seek_buffer(fz_context *ctx, fz_stream *stm, int offset, int whence)
{
int pos = stm->pos - (stm->wp - stm->rp);
/* Convert to absolute pos */
if (whence == 1)
{
offset += pos; /* Was relative to current pos */
}
else if (whence == 2)
{
offset += stm->pos; /* Was relative to end */
}
if (offset < 0)
offset = 0;
if (offset > stm->pos)
offset = stm->pos;
stm->rp += offset - pos;
}
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, next_buffer, close_buffer);
stm->seek = seek_buffer;
stm->rp = buf->data;
stm->wp = 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, next_buffer, close_buffer);
stm->seek = seek_buffer;
stm->rp = data;
stm->wp = data + len;
stm->pos = len;
return stm;
}
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