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/* soup-brotli-decompressor.c
*
* Copyright 2019 Igalia S.L.
*
* This file is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: LGPL-2.0-or-later
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <brotli/decode.h>
#include <gio/gio.h>
#include "soup-brotli-decompressor.h"
struct _SoupBrotliDecompressor
{
GObject parent_instance;
BrotliDecoderState *state;
GError *last_error;
};
static void soup_brotli_decompressor_iface_init (GConverterIface *iface);
G_DEFINE_TYPE_EXTENDED (SoupBrotliDecompressor, soup_brotli_decompressor, G_TYPE_OBJECT, 0,
G_IMPLEMENT_INTERFACE (G_TYPE_CONVERTER, soup_brotli_decompressor_iface_init))
SoupBrotliDecompressor *
soup_brotli_decompressor_new (void)
{
return g_object_new (SOUP_TYPE_BROTLI_DECOMPRESSOR, NULL);
}
static GError *
soup_brotli_decompressor_create_error (SoupBrotliDecompressor *self)
{
BrotliDecoderErrorCode code;
const char *error_string;
g_assert (self->state != NULL);
code = BrotliDecoderGetErrorCode (self->state);
error_string = BrotliDecoderErrorString (code);
return g_error_new (G_IO_ERROR, G_IO_ERROR_FAILED, "SoupBrotliDecompressorError: %s", error_string);
}
static void
soup_brotli_decompressor_set_error (SoupBrotliDecompressor *self,
GError **error)
{
BrotliDecoderErrorCode code;
const char *error_string;
if (error == NULL)
return;
g_assert (self->state != NULL);
code = BrotliDecoderGetErrorCode (self->state);
error_string = BrotliDecoderErrorString (code);
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, "SoupBrotliDecompressorError: %s", error_string);
}
static GConverterResult
soup_brotli_decompressor_convert (GConverter *converter,
const void *inbuf,
gsize inbuf_size,
void *outbuf,
gsize outbuf_size,
GConverterFlags flags,
gsize *bytes_read,
gsize *bytes_written,
GError **error)
{
SoupBrotliDecompressor *self = SOUP_BROTLI_DECOMPRESSOR (converter);
BrotliDecoderResult result;
gsize available_in = inbuf_size;
const guint8 *next_in = inbuf;
gsize available_out = outbuf_size;
guchar *next_out = outbuf;
g_return_val_if_fail (inbuf, G_CONVERTER_ERROR);
if (self->last_error) {
if (error)
*error = g_steal_pointer (&self->last_error);
g_clear_error (&self->last_error);
return G_CONVERTER_ERROR;
}
/* NOTE: all error domains/codes must match GZlibDecompressor */
if (self->state == NULL) {
self->state = BrotliDecoderCreateInstance (NULL, NULL, NULL);
if (self->state == NULL) {
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED, "SoupBrotliDecompressorError: Failed to initialize state");
return G_CONVERTER_ERROR;
}
}
result = BrotliDecoderDecompressStream (self->state, &available_in, &next_in, &available_out, &next_out, NULL);
/* available_in is now set to *unread* input size */
*bytes_read = inbuf_size - available_in;
/* available_out is now set to *unwritten* output size */
*bytes_written = outbuf_size - available_out;
/* As per API docs: If any data was either produced or consumed, and then an error happens, then only
* the successful conversion is reported and the error is returned on the next call. */
if (*bytes_read || *bytes_written) {
switch (result) {
case BROTLI_DECODER_RESULT_ERROR:
self->last_error = soup_brotli_decompressor_create_error (self);
break;
case BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT:
self->last_error = g_error_new_literal (G_IO_ERROR, G_IO_ERROR_PARTIAL_INPUT, "SoupBrotliDecompressorError: More input required (corrupt input)");
break;
case BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT:
/* Just continue with more output then */
break;
case BROTLI_DECODER_RESULT_SUCCESS:
/* Just continue returning finished next time */
break;
}
return G_CONVERTER_CONVERTED;
}
switch (result) {
case BROTLI_DECODER_RESULT_SUCCESS:
return G_CONVERTER_FINISHED;
case BROTLI_DECODER_RESULT_ERROR:
soup_brotli_decompressor_set_error (self, error);
return G_CONVERTER_ERROR;
case BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT:
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PARTIAL_INPUT, "SoupBrotliDecompressorError: More input required (corrupt input)");
return G_CONVERTER_ERROR;
case BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT:
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NO_SPACE, "SoupBrotliDecompressorError: Larger output buffer required");
return G_CONVERTER_ERROR;
}
g_assert_not_reached ();
return G_CONVERTER_ERROR;
}
static void
soup_brotli_decompressor_reset (GConverter *converter)
{
SoupBrotliDecompressor *self = SOUP_BROTLI_DECOMPRESSOR (converter);
if (self->state && BrotliDecoderIsUsed (self->state))
g_clear_pointer (&self->state, BrotliDecoderDestroyInstance);
g_clear_error (&self->last_error);
}
static void
soup_brotli_decompressor_finalize (GObject *object)
{
SoupBrotliDecompressor *self = (SoupBrotliDecompressor *)object;
g_clear_pointer (&self->state, BrotliDecoderDestroyInstance);
g_clear_error (&self->last_error);
G_OBJECT_CLASS (soup_brotli_decompressor_parent_class)->finalize (object);
}
static void soup_brotli_decompressor_iface_init (GConverterIface *iface)
{
iface->convert = soup_brotli_decompressor_convert;
iface->reset = soup_brotli_decompressor_reset;
}
static void
soup_brotli_decompressor_class_init (SoupBrotliDecompressorClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = soup_brotli_decompressor_finalize;
}
static void
soup_brotli_decompressor_init (SoupBrotliDecompressor *self)
{
}
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