GCOV - Varnish Cache


/*-
 * Copyright (c) 2011 Varnish Software AS
 * All rights reserved.
 *
 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * VEF Varnish Esi Fetching
 */

#include "config.h"

#include <stdlib.h>

#include "cache_varnishd.h"
#include "cache_filter.h"
#include "cache_vgz.h"

#include "cache_esi.h"

#include "vrnd.h"

/*---------------------------------------------------------------------
 */

struct vef_priv {
        unsigned                magic;
#define VEF_MAGIC               0xf104b51f
        int                     error;
        ssize_t                 tot;

        struct vgz              *vgz;

        struct vep_state        *vep;

        char                    *ibuf;
        char                    *ibuf_i;
        char                    *ibuf_o;
        ssize_t                 ibuf_sz;
};

static ssize_t
vfp_vep_callback(struct vfp_ctx *vc, void *priv, ssize_t l, enum vgz_flag flg)
{
        struct vef_priv *vef;
        ssize_t dl;
        const void *dp;
        uint8_t *ptr;
        enum vgzret_e i;

        CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
        CAST_OBJ_NOTNULL(vef, priv, VEF_MAGIC);
        assert(l >= 0);

        if (vef->error) {
                vef->tot += l;
                return (vef->tot);
        }

        /*
         * l == 0 is valid when 'flg' calls for action, but in the
         * normal case we can just ignore a l==0 request.
         * (It would cause Z_BUF_ERROR anyway)
         */
        if (l == 0 && flg == VGZ_NORMAL)
                return (vef->tot);

        VGZ_Ibuf(vef->vgz, vef->ibuf_o, l);
        do {
                dl = 0;
                if (VFP_GetStorage(vc, &dl, &ptr) != VFP_OK) {
                        vef->error = ENOMEM;
                        vef->tot += l;
                        return (vef->tot);
                }
                VGZ_Obuf(vef->vgz, ptr, dl);
                i = VGZ_Gzip(vef->vgz, &dp, &dl, flg);
                VGZ_UpdateObj(vc, vef->vgz, i);
                if (dl > 0) {
                        vef->tot += dl;
                        VFP_Extend(vc, dl, VFP_OK);
                }
        } while (i != VGZ_ERROR &&
            (!VGZ_IbufEmpty(vef->vgz) || VGZ_ObufFull(vef->vgz)));
        assert(i == VGZ_ERROR || VGZ_IbufEmpty(vef->vgz));
        vef->ibuf_o += l;
        return (vef->tot);
}

static enum vfp_status
vfp_esi_end(struct vfp_ctx *vc, struct vef_priv *vef,
    enum vfp_status retval)
{
        struct vsb *vsb;
        ssize_t l;
        void *p;

        CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vef, VEF_MAGIC);

        if (retval == VFP_ERROR) {
                if (vef->error == 0)
                        vef->error = errno ? errno : EINVAL;
        } else {
                assert(retval == VFP_END);
        }

        vsb = VEP_Finish(vef->vep);

        if (vsb != NULL) {
                if (retval == VFP_END) {
                        l = VSB_len(vsb);
                        assert(l > 0);
                        p = ObjSetAttr(vc->wrk, vc->oc,
                            OA_ESIDATA, l, VSB_data(vsb));
                        if (p == NULL) {
                                retval = VFP_Error(vc,
                                    "Could not allocate storage for esidata");
                        }
                }
                VSB_destroy(&vsb);
        }

        if (vef->vgz != NULL) {
                if (retval == VFP_END)
                        VGZ_UpdateObj(vc, vef->vgz, VGZ_END);
                if (VGZ_Destroy(vc->wrk, &vef->vgz) != VGZ_END)
                        retval = VFP_Error(vc,
                            "ESI+Gzip Failed at the very end");
        }
        if (vef->ibuf != NULL)
                free(vef->ibuf);
        FREE_OBJ(vef);
        return (retval);
}

static enum vfp_status v_matchproto_(vfp_init_f)
vfp_esi_gzip_init(VRT_CTX, struct vfp_ctx *vc, struct vfp_entry *vfe)
{
        struct vef_priv *vef;

        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vc->req, HTTP_MAGIC);
        CHECK_OBJ_NOTNULL(vfe, VFP_ENTRY_MAGIC);
        if (http_GetStatus(vc->resp) == 206) {
                VSLb(vc->wrk->vsl, SLT_VCL_Error,
                    "Attempted ESI on partial (206) response");
                return (VFP_ERROR);
        }
        ALLOC_OBJ(vef, VEF_MAGIC);
        if (vef == NULL)
                return (VFP_ERROR);
        vc->obj_flags |= OF_GZIPED | OF_CHGCE | OF_ESIPROC;
        vef->vep = VEP_Init(vc, vc->req, vfp_vep_callback, vef);
        if (vef->vep == NULL) {
                FREE_OBJ(vef);
                return (VFP_ERROR);
        }
        vef->vgz = VGZ_NewGzip(vc->wrk->vsl, "G F E");
        AN(vef->vgz);

        vef->ibuf_sz = cache_param->gzip_buffer;
        vef->ibuf = calloc(1L, vef->ibuf_sz);
        if (vef->ibuf == NULL)
                return (vfp_esi_end(vc, vef, VFP_ERROR));
        vef->ibuf_i = vef->ibuf;
        vef->ibuf_o = vef->ibuf;
        vfe->priv1 = vef;

        RFC2616_Weaken_Etag(vc->resp);
        http_Unset(vc->resp, H_Content_Length);
        http_Unset(vc->resp, H_Content_Encoding);
        http_SetHeader(vc->resp, "Content-Encoding: gzip");

        RFC2616_Vary_AE(vc->resp);

        return (VFP_OK);
}

static enum vfp_status v_matchproto_(vfp_pull_f)
vfp_esi_gzip_pull(struct vfp_ctx *vc, struct vfp_entry *vfe, void *p,
   ssize_t *lp)
{
        enum vfp_status vp;
        ssize_t d, l;
        struct vef_priv *vef;

        CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vfe, VFP_ENTRY_MAGIC);
        CAST_OBJ_NOTNULL(vef, vfe->priv1, VEF_MAGIC);
        AN(p);
        AN(lp);
        *lp = 0;
        l = vef->ibuf_sz - (vef->ibuf_i - vef->ibuf);
        if (DO_DEBUG(DBG_ESI_CHOP)) {
                d = (VRND_RandomTestable() & 3) + 1;
                if (d < l)
                        l = d;
        }
        vp = VFP_Suck(vc, vef->ibuf_i, &l);

        if (l > 0) {
                VEP_Parse(vef->vep, vef->ibuf_i, l);
                vef->ibuf_i += l;
                assert(vef->ibuf_o >= vef->ibuf && vef->ibuf_o <= vef->ibuf_i);
                if (vef->error) {
                        errno = vef->error;
                        return (VFP_ERROR);
                }
                l = vef->ibuf_i - vef->ibuf_o;
                if (l > 0)
                        memmove(vef->ibuf, vef->ibuf_o, l);
                vef->ibuf_o = vef->ibuf;
                vef->ibuf_i = vef->ibuf + l;
        }
        if (vp == VFP_END) {
                vp = vfp_esi_end(vc, vef, vp);
                vfe->priv1 = NULL;
        }
        return (vp);
}

static enum vfp_status v_matchproto_(vfp_init_f)
vfp_esi_init(VRT_CTX, struct vfp_ctx *vc, struct vfp_entry *vfe)
{
        struct vef_priv *vef;
        struct vep_state *vep;

        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vc->req, HTTP_MAGIC);
        if (http_GetStatus(vc->resp) == 206) {
                VSLb(vc->wrk->vsl, SLT_VCL_Error,
                    "Attempted ESI on partial (206) response");
                return (VFP_ERROR);
        }
        vep = VEP_Init(vc, vc->req, NULL, NULL);
        if (vep == NULL)
                return (VFP_ERROR);
        ALLOC_OBJ(vef, VEF_MAGIC);
        if (vef == NULL)
                return (VFP_ERROR);
        vc->obj_flags |= OF_ESIPROC;
        vef->vep = vep;
        vfe->priv1 = vef;
        return (VFP_OK);
}

static enum vfp_status v_matchproto_(vfp_pull_f)
vfp_esi_pull(struct vfp_ctx *vc, struct vfp_entry *vfe, void *p, ssize_t *lp)
{
        enum vfp_status vp;
        struct vef_priv *vef;

        CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vfe, VFP_ENTRY_MAGIC);
        CAST_OBJ_NOTNULL(vef, vfe->priv1, VEF_MAGIC);
        AN(p);
        AN(lp);
        if (DO_DEBUG(DBG_ESI_CHOP)) {
                *lp = vmin_t(size_t, *lp, (VRND_RandomTestable() & 3) + 1);
        }
        vp = VFP_Suck(vc, p, lp);
        if (vp != VFP_ERROR && *lp > 0)
                VEP_Parse(vef->vep, p, *lp);
        if (vp == VFP_END) {
                vp = vfp_esi_end(vc, vef, vp);
                vfe->priv1 = NULL;
        }
        return (vp);
}

static void v_matchproto_(vfp_fini_f)
vfp_esi_fini(struct vfp_ctx *vc, struct vfp_entry *vfe)
{
        CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vfe, VFP_ENTRY_MAGIC);

        if (vfe->priv1 == NULL)
                return;

        if (vc->oc->stobj->stevedore == NULL)
                errno = ENOMEM;

        (void)vfp_esi_end(vc, vfe->priv1, VFP_ERROR);
        vfe->priv1 = NULL;
}

const struct vfp VFP_esi = {
        .name = "esi",
        .init = vfp_esi_init,
        .pull = vfp_esi_pull,
        .fini = vfp_esi_fini,
};

const struct vfp VFP_esi_gzip = {
        .name = "esi_gzip",
        .init = vfp_esi_gzip_init,
        .pull = vfp_esi_gzip_pull,
        .fini = vfp_esi_fini,
};

		varnish-cache/bin/varnishd/cache/cache_esi_fetch.c
0		/*-
1		* Copyright (c) 2011 Varnish Software AS
2		* All rights reserved.
3		*
4		* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
5		*
6		* SPDX-License-Identifier: BSD-2-Clause
7		*
8		* Redistribution and use in source and binary forms, with or without
9		* modification, are permitted provided that the following conditions
10		* are met:
11		* 1. Redistributions of source code must retain the above copyright
12		* notice, this list of conditions and the following disclaimer.
13		* 2. Redistributions in binary form must reproduce the above copyright
14		* notice, this list of conditions and the following disclaimer in the
15		* documentation and/or other materials provided with the distribution.
16		*
17		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20		* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
21		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27		* SUCH DAMAGE.
28		*
29		* VEF Varnish Esi Fetching
30		*/
31
32		#include "config.h"
33
34		#include <stdlib.h>
35
36		#include "cache_varnishd.h"
37		#include "cache_filter.h"
38		#include "cache_vgz.h"
39
40		#include "cache_esi.h"
41
42		#include "vrnd.h"
43
44		/*---------------------------------------------------------------------
45		*/
46
47		struct vef_priv {
48		unsigned magic;
49		#define VEF_MAGIC 0xf104b51f
50		int error;
51		ssize_t tot;
52
53		struct vgz *vgz;
54
55		struct vep_state *vep;
56
57		char *ibuf;
58		char *ibuf_i;
59		char *ibuf_o;
60		ssize_t ibuf_sz;
61		};
62
63		static ssize_t
64	2313	vfp_vep_callback(struct vfp_ctx vc, void priv, ssize_t l, enum vgz_flag flg)
65		{
66		struct vef_priv *vef;
67		ssize_t dl;
68		const void *dp;
69		uint8_t *ptr;
70		enum vgzret_e i;
71
72	2313	CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
73	2313	CAST_OBJ_NOTNULL(vef, priv, VEF_MAGIC);
74	2313	assert(l >= 0);
75
76	2313	if (vef->error) {
77	10	vef->tot += l;
78	10	return (vef->tot);
79		}
80
81		/*
82		* l == 0 is valid when 'flg' calls for action, but in the
83		* normal case we can just ignore a l==0 request.
84		* (It would cause Z_BUF_ERROR anyway)
85		*/
86	2303	if (l == 0 && flg == VGZ_NORMAL)
87	428	return (vef->tot);
88
89	1875	VGZ_Ibuf(vef->vgz, vef->ibuf_o, l);
90	1875	do {
91	2135	dl = 0;
92	2135	if (VFP_GetStorage(vc, &dl, &ptr) != VFP_OK) {
93	2	vef->error = ENOMEM;
94	2	vef->tot += l;
95	2	return (vef->tot);
96		}
97	2133	VGZ_Obuf(vef->vgz, ptr, dl);
98	2133	i = VGZ_Gzip(vef->vgz, &dp, &dl, flg);
99	2133	VGZ_UpdateObj(vc, vef->vgz, i);
100	2133	if (dl > 0) {
101	941	vef->tot += dl;
102	941	VFP_Extend(vc, dl, VFP_OK);
103	941	}
104	4266	} while (i != VGZ_ERROR &&
105	2133	(!VGZ_IbufEmpty(vef->vgz) \|\| VGZ_ObufFull(vef->vgz)));
106	1873	assert(i == VGZ_ERROR \|\| VGZ_IbufEmpty(vef->vgz));
107	1873	vef->ibuf_o += l;
108	1873	return (vef->tot);
109	2313	}
110
111		static enum vfp_status
112	434	vfp_esi_end(struct vfp_ctx vc, struct vef_priv vef,
113		enum vfp_status retval)
114		{
115		struct vsb *vsb;
116		ssize_t l;
117		void *p;
118
119	434	CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
120	434	CHECK_OBJ_NOTNULL(vef, VEF_MAGIC);
121
122	434	if (retval == VFP_ERROR) {
123	12	if (vef->error == 0)
124	10	vef->error = errno ? errno : EINVAL;
125	12	} else {
126	422	assert(retval == VFP_END);
127		}
128
129	434	vsb = VEP_Finish(vef->vep);
130
131	434	if (vsb != NULL) {
132	234	if (retval == VFP_END) {
133	232	l = VSB_len(vsb);
134	232	assert(l > 0);
135	464	p = ObjSetAttr(vc->wrk, vc->oc,
136	232	OA_ESIDATA, l, VSB_data(vsb));
137	232	if (p == NULL) {
138	0	retval = VFP_Error(vc,
139		"Could not allocate storage for esidata");
140	0	}
141	232	}
142	234	VSB_destroy(&vsb);
143	234	}
144
145	434	if (vef->vgz != NULL) {
146	152	if (retval == VFP_END)
147	144	VGZ_UpdateObj(vc, vef->vgz, VGZ_END);
148	152	if (VGZ_Destroy(vc->wrk, &vef->vgz) != VGZ_END)
149	8	retval = VFP_Error(vc,
150		"ESI+Gzip Failed at the very end");
151	152	}
152	434	if (vef->ibuf != NULL)
153	152	free(vef->ibuf);
154	434	FREE_OBJ(vef);
155	434	return (retval);
156		}
157
158		static enum vfp_status v_matchproto_(vfp_init_f)
159	256	vfp_esi_gzip_init(VRT_CTX, struct vfp_ctx vc, struct vfp_entry vfe)
160		{
161		struct vef_priv *vef;
162
163	256	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
164	256	CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
165	256	CHECK_OBJ_NOTNULL(vc->req, HTTP_MAGIC);
166	256	CHECK_OBJ_NOTNULL(vfe, VFP_ENTRY_MAGIC);
167	256	if (http_GetStatus(vc->resp) == 206) {
168	0	VSLb(vc->wrk->vsl, SLT_VCL_Error,
169		"Attempted ESI on partial (206) response");
170	0	return (VFP_ERROR);
171		}
172	256	ALLOC_OBJ(vef, VEF_MAGIC);
173	256	if (vef == NULL)
174	0	return (VFP_ERROR);
175	256	vc->obj_flags \|= OF_GZIPED \| OF_CHGCE \| OF_ESIPROC;
176	256	vef->vep = VEP_Init(vc, vc->req, vfp_vep_callback, vef);
177	256	if (vef->vep == NULL) {
178	104	FREE_OBJ(vef);
179	104	return (VFP_ERROR);
180		}
181	152	vef->vgz = VGZ_NewGzip(vc->wrk->vsl, "G F E");
182	152	AN(vef->vgz);
183
184	152	vef->ibuf_sz = cache_param->gzip_buffer;
185	152	vef->ibuf = calloc(1L, vef->ibuf_sz);
186	152	if (vef->ibuf == NULL)
187	0	return (vfp_esi_end(vc, vef, VFP_ERROR));
188	152	vef->ibuf_i = vef->ibuf;
189	152	vef->ibuf_o = vef->ibuf;
190	152	vfe->priv1 = vef;
191
192	152	RFC2616_Weaken_Etag(vc->resp);
193	152	http_Unset(vc->resp, H_Content_Length);
194	152	http_Unset(vc->resp, H_Content_Encoding);
195	152	http_SetHeader(vc->resp, "Content-Encoding: gzip");
196
197	152	RFC2616_Vary_AE(vc->resp);
198
199	152	return (VFP_OK);
200	256	}
201
202		static enum vfp_status v_matchproto_(vfp_pull_f)
203	1113	vfp_esi_gzip_pull(struct vfp_ctx vc, struct vfp_entry vfe, void *p,
204		ssize_t *lp)
205		{
206		enum vfp_status vp;
207		ssize_t d, l;
208		struct vef_priv *vef;
209
210	1113	CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
211	1113	CHECK_OBJ_NOTNULL(vfe, VFP_ENTRY_MAGIC);
212	1113	CAST_OBJ_NOTNULL(vef, vfe->priv1, VEF_MAGIC);
213	1113	AN(p);
214	1113	AN(lp);
215	1113	*lp = 0;
216	1113	l = vef->ibuf_sz - (vef->ibuf_i - vef->ibuf);
217	1113	if (DO_DEBUG(DBG_ESI_CHOP)) {
218	783	d = (VRND_RandomTestable() & 3) + 1;
219	783	if (d < l)
220	783	l = d;
221	783	}
222	1113	vp = VFP_Suck(vc, vef->ibuf_i, &l);
223
224	1113	if (l > 0) {
225	991	VEP_Parse(vef->vep, vef->ibuf_i, l);
226	991	vef->ibuf_i += l;
227	991	assert(vef->ibuf_o >= vef->ibuf && vef->ibuf_o <= vef->ibuf_i);
228	991	if (vef->error) {
229	2	errno = vef->error;
230	2	return (VFP_ERROR);
231		}
232	989	l = vef->ibuf_i - vef->ibuf_o;
233	989	if (l > 0)
234	60	memmove(vef->ibuf, vef->ibuf_o, l);
235	989	vef->ibuf_o = vef->ibuf;
236	989	vef->ibuf_i = vef->ibuf + l;
237	989	}
238	1111	if (vp == VFP_END) {
239	144	vp = vfp_esi_end(vc, vef, vp);
240	144	vfe->priv1 = NULL;
241	144	}
242	1111	return (vp);
243	1113	}
244
245		static enum vfp_status v_matchproto_(vfp_init_f)
246	284	vfp_esi_init(VRT_CTX, struct vfp_ctx vc, struct vfp_entry vfe)
247		{
248		struct vef_priv *vef;
249		struct vep_state *vep;
250
251	284	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
252	284	CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
253	284	CHECK_OBJ_NOTNULL(vc->req, HTTP_MAGIC);
254	284	if (http_GetStatus(vc->resp) == 206) {
255	2	VSLb(vc->wrk->vsl, SLT_VCL_Error,
256		"Attempted ESI on partial (206) response");
257	2	return (VFP_ERROR);
258		}
259	282	vep = VEP_Init(vc, vc->req, NULL, NULL);
260	282	if (vep == NULL)
261	0	return (VFP_ERROR);
262	282	ALLOC_OBJ(vef, VEF_MAGIC);
263	282	if (vef == NULL)
264	0	return (VFP_ERROR);
265	282	vc->obj_flags \|= OF_ESIPROC;
266	282	vef->vep = vep;
267	282	vfe->priv1 = vef;
268	282	return (VFP_OK);
269	284	}
270
271		static enum vfp_status v_matchproto_(vfp_pull_f)
272	106764	vfp_esi_pull(struct vfp_ctx vc, struct vfp_entry vfe, void p, ssize_t lp)
273		{
274		enum vfp_status vp;
275		struct vef_priv *vef;
276
277	106764	CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
278	106764	CHECK_OBJ_NOTNULL(vfe, VFP_ENTRY_MAGIC);
279	106764	CAST_OBJ_NOTNULL(vef, vfe->priv1, VEF_MAGIC);
280	106764	AN(p);
281	106764	AN(lp);
282	106764	if (DO_DEBUG(DBG_ESI_CHOP)) {
283	106378	lp = vmin_t(size_t, lp, (VRND_RandomTestable() & 3) + 1);
284	106378	}
285	106764	vp = VFP_Suck(vc, p, lp);
286	106764	if (vp != VFP_ERROR && *lp > 0)
287	106742	VEP_Parse(vef->vep, p, *lp);
288	106764	if (vp == VFP_END) {
289	278	vp = vfp_esi_end(vc, vef, vp);
290	278	vfe->priv1 = NULL;
291	278	}
292	106764	return (vp);
293		}
294
295		static void v_matchproto_(vfp_fini_f)
296	540	vfp_esi_fini(struct vfp_ctx vc, struct vfp_entry vfe)
297		{
298	540	CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
299	540	CHECK_OBJ_NOTNULL(vfe, VFP_ENTRY_MAGIC);
300
301	540	if (vfe->priv1 == NULL)
302	528	return;
303
304	12	if (vc->oc->stobj->stevedore == NULL)
305	2	errno = ENOMEM;
306
307	12	(void)vfp_esi_end(vc, vfe->priv1, VFP_ERROR);
308	12	vfe->priv1 = NULL;
309	540	}
310
311		const struct vfp VFP_esi = {
312		.name = "esi",
313		.init = vfp_esi_init,
314		.pull = vfp_esi_pull,
315		.fini = vfp_esi_fini,
316		};
317
318		const struct vfp VFP_esi_gzip = {
319		.name = "esi_gzip",
320		.init = vfp_esi_gzip_init,
321		.pull = vfp_esi_gzip_pull,
322		.fini = vfp_esi_fini,
323		};