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chunk handling and transform rewrite

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This implements a new chunk parse implementation that can be shared, it
is currently shared by the progressive reader and the sequential one
(not, yet, the writer).

The patch also implements shared transform handling that is used
throughout.

Signed-off-by: John Bowler <jbowler@acm.org>
This commit is contained in:
John Bowler
2015-09-14 20:42:40 -07:00
parent c5ead5d2cd
commit 3184947a25
26 changed files with 16933 additions and 13338 deletions
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42
pngrio.c
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@@ -34,11 +34,11 @@ png_read_data(png_structrp png_ptr, png_bytep data, png_size_t length)
{
png_debug1(4, "reading %d bytes", (int)length);
if (png_ptr->read_data_fn != NULL)
(*(png_ptr->read_data_fn))(png_ptr, data, length);
if (png_ptr->rw_data_fn != NULL)
png_ptr->rw_data_fn(png_ptr, data, length);
else
png_error(png_ptr, "Call to NULL read function");
png_app_error(png_ptr, "No read function");
}
#ifdef PNG_STDIO_SUPPORTED
@@ -63,7 +63,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
if (check != length)
png_error(png_ptr, "Read Error");
}
#endif
#endif /* STDIO */
/* This function allows the application to supply a new input function
* for libpng if standard C streams aren't being used.
@@ -91,31 +91,19 @@ png_set_read_fn(png_structrp png_ptr, png_voidp io_ptr,
if (png_ptr == NULL)
return;
png_ptr->io_ptr = io_ptr;
#ifdef PNG_STDIO_SUPPORTED
if (read_data_fn != NULL)
png_ptr->read_data_fn = read_data_fn;
else
png_ptr->read_data_fn = png_default_read_data;
#else
png_ptr->read_data_fn = read_data_fn;
#endif
#ifdef PNG_WRITE_SUPPORTED
/* It is an error to write to a read device */
if (png_ptr->write_data_fn != NULL)
if (!png_ptr->read_struct)
{
png_ptr->write_data_fn = NULL;
png_warning(png_ptr,
"Can't set both read_data_fn and write_data_fn in the"
" same structure");
png_app_error(png_ptr, "cannot set a read function on a write struct");
return;
}
#endif
#ifdef PNG_WRITE_FLUSH_SUPPORTED
png_ptr->output_flush_fn = NULL;
#endif
if (read_data_fn == NULL)
{
png_app_error(png_ptr, "API change: png_set_read_fn requires a function");
return;
}
png_ptr->io_ptr = io_ptr;
png_ptr->rw_data_fn = read_data_fn;
}
#endif /* READ */