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/*
* evd-http-chunked-decoder.c
*
* EventDance, Peer-to-peer IPC library <http://eventdance.org>
*
* Copyright (C) 2011, Igalia S.L.
*
* Authors:
* Eduardo Lima Mitev <elima@igalia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 3, or (at your option) any later version as published by
* the Free Software Foundation.
*
* This library 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 at http://www.gnu.org/licenses/lgpl-3.0.txt
* for more details.
*/
#include <stdio.h>
#include <string.h>
#include <gio/gio.h>
#include "evd-http-chunked-decoder.h"
#define EVD_HTTP_CHUNKED_DECODER_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
EVD_TYPE_HTTP_CHUNKED_DECODER, \
EvdHttpChunkedDecoderPrivate))
/* private data */
struct _EvdHttpChunkedDecoderPrivate
{
gsize chunk_left;
guint status;
gchar hdr_buf[10];
gsize hdr_buf_len;
guint crlf_pos;
};
enum
{
READING_CHUNK_HEADER,
READING_CONTENT,
READING_CRLF_1,
READING_CRLF_2
};
static void evd_http_chunked_decoder_class_init (EvdHttpChunkedDecoderClass *class);
static void evd_http_chunked_decoder_init (EvdHttpChunkedDecoder *self);
static void converter_iface_init (GConverterIface *iface);
static GConverterResult convert (GConverter *converter,
const void *inbuf,
gsize inbuf_size,
void *outbuf,
gsize outbuf_size,
GConverterFlags flags,
gsize *bytes_read,
gsize *bytes_written,
GError **error);
static void reset (GConverter *converter);
G_DEFINE_TYPE_WITH_CODE (EvdHttpChunkedDecoder, evd_http_chunked_decoder, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_CONVERTER,
converter_iface_init))
static void
evd_http_chunked_decoder_class_init (EvdHttpChunkedDecoderClass *class)
{
GObjectClass *obj_class = G_OBJECT_CLASS (class);
g_type_class_add_private (obj_class, sizeof (EvdHttpChunkedDecoderPrivate));
}
static void
converter_iface_init (GConverterIface *iface)
{
iface->reset = reset;
iface->convert = convert;
}
static void
evd_http_chunked_decoder_init (EvdHttpChunkedDecoder *self)
{
EvdHttpChunkedDecoderPrivate *priv;
priv = EVD_HTTP_CHUNKED_DECODER_GET_PRIVATE (self);
self->priv = priv;
reset (G_CONVERTER (self));
}
static GConverterResult
convert (GConverter *converter,
const void *inbuf,
gsize inbuf_size,
void *outbuf,
gsize outbuf_size,
GConverterFlags flags,
gsize *bytes_read,
gsize *bytes_written,
GError **error)
{
EvdHttpChunkedDecoder *self = EVD_HTTP_CHUNKED_DECODER (converter);
GConverterResult result = G_CONVERTER_CONVERTED;
gsize bw = 0;
const gchar *_inbuf = (const gchar *) inbuf;
char c;
gboolean done = FALSE;
gsize pos = 0;
while (! done && pos < inbuf_size && bw < outbuf_size)
{
c = _inbuf[pos];
switch (self->priv->status)
{
case READING_CHUNK_HEADER:
{
if ( (c >= '0' && c <= '9') ||
(c >= 'a' && c <= 'f') ||
(c >= 'A' && c <= 'F') ||
(c == 32) )
{
pos++;
self->priv->hdr_buf[ self->priv->hdr_buf_len ] = c;
self->priv->hdr_buf_len++;
}
else if (self->priv->hdr_buf_len > 0)
{
self->priv->hdr_buf[ self->priv->hdr_buf_len ] = '\0';
sscanf (self->priv->hdr_buf,
"%x",
(guint *) &self->priv->chunk_left);
self->priv->hdr_buf_len = 0;
self->priv->status = READING_CRLF_1;
}
else
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_DATA,
"Failed to parse chunk-size of chunked encoded content");
result = G_CONVERTER_ERROR;
done = TRUE;
}
break;
}
case READING_CRLF_1:
case READING_CRLF_2:
{
gboolean err = FALSE;
if (self->priv->crlf_pos == 0)
{
if (c == '\r')
self->priv->crlf_pos++;
else
{
g_debug ("kaka: %d", c);
err = TRUE;
}
}
else
{
if (c == '\n')
{
self->priv->crlf_pos = 0;
if (self->priv->status == READING_CRLF_1)
{
if (self->priv->chunk_left == 0)
{
result = G_CONVERTER_FINISHED;
done = TRUE;
}
else
self->priv->status = READING_CONTENT;
}
else
self->priv->status = READING_CHUNK_HEADER;
}
else
err = TRUE;
}
if (err)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_DATA,
"Failed to parse chunked encoded content");
result = G_CONVERTER_ERROR;
done = TRUE;
}
else
{
pos++;
}
break;
}
case READING_CONTENT:
{
gsize move_size;
move_size = MIN (self->priv->chunk_left,
inbuf_size - pos);
move_size = MIN (move_size, outbuf_size - bw);
g_memmove (outbuf + bw, inbuf + pos, move_size);
pos += move_size;
bw += move_size;
self->priv->chunk_left -= move_size;
if (self->priv->chunk_left == 0)
self->priv->status = READING_CRLF_2;
break;
}
}
}
if (bytes_read != NULL)
*bytes_read = pos;
if (bytes_written != NULL)
*bytes_written = bw;
if (result != G_CONVERTER_ERROR && flags & G_CONVERTER_FLUSH)
result = G_CONVERTER_FLUSHED;
return result;
}
static void
reset (GConverter *converter)
{
EvdHttpChunkedDecoder *self = EVD_HTTP_CHUNKED_DECODER (converter);
self->priv->chunk_left = 0;
self->priv->status = READING_CHUNK_HEADER;
self->priv->hdr_buf_len = 0;
self->priv->crlf_pos = 0;
}
/* public methods */
EvdHttpChunkedDecoder *
evd_http_chunked_decoder_new (void)
{
return g_object_new (EVD_TYPE_HTTP_CHUNKED_DECODER, NULL);
}
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