Annotation of libelwix/src/pack.c, revision 1.6.2.4

1.3       misho       1: /*************************************************************************
                      2: * (C) 2013 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
                      3: *  by Michael Pounov <misho@elwix.org>
                      4: *
                      5: * $Author: misho $
1.6.2.4 ! misho       6: * $Id: pack.c,v 1.6.2.3 2014/02/13 15:06:44 misho Exp $
1.3       misho       7: *
                      8: **************************************************************************
                      9: The ELWIX and AITNET software is distributed under the following
                     10: terms:
                     11: 
                     12: All of the documentation and software included in the ELWIX and AITNET
                     13: Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
                     14: 
                     15: Copyright 2004 - 2014
                     16:        by Michael Pounov <misho@elwix.org>.  All rights reserved.
                     17: 
                     18: Redistribution and use in source and binary forms, with or without
                     19: modification, are permitted provided that the following conditions
                     20: are met:
                     21: 1. Redistributions of source code must retain the above copyright
                     22:    notice, this list of conditions and the following disclaimer.
                     23: 2. Redistributions in binary form must reproduce the above copyright
                     24:    notice, this list of conditions and the following disclaimer in the
                     25:    documentation and/or other materials provided with the distribution.
                     26: 3. All advertising materials mentioning features or use of this software
                     27:    must display the following acknowledgement:
                     28: This product includes software developed by Michael Pounov <misho@elwix.org>
                     29: ELWIX - Embedded LightWeight unIX and its contributors.
                     30: 4. Neither the name of AITNET nor the names of its contributors
                     31:    may be used to endorse or promote products derived from this software
                     32:    without specific prior written permission.
                     33: 
                     34: THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
                     35: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     36: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     37: ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     38: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     39: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     40: OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     41: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     42: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     43: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     44: SUCH DAMAGE.
                     45: */
1.2       misho      46: #include "global.h"
                     47: 
                     48: 
                     49: static inline uint8_t *
                     50: rpack_next_boundary(uint8_t * __restrict buf, uint8_t * __restrict p, size_t align)
                     51: {
                     52:        size_t misa = (size_t) (p - buf) % align;
                     53: 
                     54:        if (!misa)
                     55:                return p;
                     56: 
                     57:        return p + (align - misa);
                     58: }
                     59: 
                     60: 
                     61: /*
                     62:  * rpack_create() - Allocate & init raw packet structure
                     63:  *
                     64:  * @buf = buffer
                     65:  * @buflen = length of buffer
                     66:  * return: NULL error or !=NULL raw packet, should be freed by rpack_destroy()
                     67:  */
                     68: rpack_t *
                     69: rpack_create(void * __restrict buf, size_t buflen)
                     70: {
                     71:        rpack_t *rp = NULL;
                     72: 
                     73:        rp = e_malloc(sizeof(rpack_t));
                     74:        if (!rp) {
                     75:                LOGERR;
                     76:                return NULL;
                     77:        }
                     78: 
                     79:        RPACK_INIT(rp, buf, buflen);
                     80:        return rp;
                     81: }
                     82: 
                     83: /*
                     84:  * rpack_destroy() - Release & free raw packet structure
                     85:  *
                     86:  * @rp = raw packet
                     87:  * return: none
                     88:  */
                     89: void
                     90: rpack_destroy(rpack_t ** __restrict rp)
                     91: {
                     92:        if (!rp)
                     93:                return;
                     94: 
                     95:        if (*rp) {
                     96:                RPACK_FREE(*rp);
                     97:                e_free(*rp);
                     98:                *rp = NULL;
                     99:        }
                    100: }
                    101: 
                    102: /*
1.6.2.1   misho     103:  * rpack_attach() - Attach dynamic allocating buffer at packet
                    104:  *
                    105:  * @rp = raw packet;
                    106:  * @len = allocate bytes
                    107:  * return: -1 error or 0 ok, should be detached with rpack_detach() 
                    108:  *                             before call rpack_destroy() after use!
                    109:  */
                    110: int
                    111: rpack_attach(rpack_t * __restrict rp, size_t len)
                    112: {
                    113:        if (!rp)
                    114:                return -1;
                    115: 
                    116:        rp->r_buf = e_malloc(len);
                    117:        if (!rp->r_buf) {
                    118:                RPACK_FREE(rp);
                    119:                return -1;
                    120:        } else
                    121:                rp->r_len = len;
                    122:        rp->r_next = rp->r_buf;
                    123: 
                    124:        return 0;
                    125: }
                    126: 
                    127: /*
                    128:  * rpack_resize() - Resize dynamic allocated buffer at packet
                    129:  *
                    130:  * @rp = raw packet
                    131:  * @newlen = resize buffer to bytes
                    132:  * return: -1 error or 0 ok, should be detached with rpack_detach() 
                    133:  *                             before call rpack_destroy() after use!
                    134:  */
                    135: int
                    136: rpack_resize(rpack_t * __restrict rp, size_t newlen)
                    137: {
                    138:        void *buf = NULL;
                    139: 
                    140:        if (!rp)
                    141:                return -1;
                    142: 
                    143:        buf = e_realloc(rp->r_buf, newlen);
                    144:        if (!buf)
                    145:                return -1;
                    146:        else {
                    147:                rp->r_buf = buf;
                    148:                rp->r_len = newlen;
                    149:        }
                    150: 
                    151:        if (rp->r_next > (rp->r_buf + rp->r_len))
                    152:                rp->r_next = rp->r_buf;
                    153: 
                    154:        return 0;
                    155: }
                    156: 
                    157: /*
                    158:  * rpack_detach() - Detach and free dynamic allocated buffer from packet
                    159:  *
                    160:  * @rp = raw packet
                    161:  * return: none
                    162:  */
                    163: void
                    164: rpack_detach(rpack_t * __restrict rp)
                    165: {
                    166:        if (!rp)
                    167:                return;
                    168: 
                    169:        e_free(rp->r_buf);
                    170:        RPACK_FREE(rp);
                    171: }
                    172: 
                    173: /*
1.2       misho     174:  * rpack_align_and_reserve() - Align & reserve space
                    175:  *
                    176:  * @rp = raw buffer
                    177:  * @siz = need size
                    178:  * return: NULL error or not enough space, !=NULL next position
                    179:  */
                    180: uint8_t *
                    181: rpack_align_and_reserve(rpack_t * __restrict rp, size_t siz)
                    182: {
                    183:        uint8_t *n;
                    184: 
                    185:        if (!RPACK_SANITY(rp))
                    186:                return NULL;
                    187: 
                    188:        n = rpack_next_boundary(rp->r_buf, rp->r_next, siz);
                    189:        /* too little space for siz */
                    190:        if (n - rp->r_buf + siz > rp->r_len)
                    191:                return NULL;
                    192: 
                    193:        return n;
                    194: }
                    195: 
                    196: 
                    197: /*
                    198:  * rpack_uint8() - Pack/Unpack 8bit value
                    199:  *
                    200:  * @rp = raw buffer
                    201:  * @n = set value if !=NULL
                    202:  * return: -1 error or get value
                    203:  */
                    204: uint8_t
                    205: rpack_uint8(rpack_t * __restrict rp, uint8_t * __restrict n)
                    206: {
                    207:        uint8_t u;
                    208: 
                    209:        if (!RPACK_SANITY(rp))
                    210:                return (uint8_t) -1;
                    211:        /* No space left */
                    212:        if ((size_t) (rp->r_next - rp->r_buf) >= rp->r_len)
                    213:                return (uint8_t) -1;
                    214: 
                    215:        u = *rp->r_next;
                    216:        if (n)
                    217:                *rp->r_next = *n;
                    218: 
                    219:        rp->r_next++;
                    220:        return u;
                    221: }
                    222: 
                    223: /*
                    224:  * rpack_uint16() - Pack/Unpack 16bit value
                    225:  *
                    226:  * @rp = raw buffer
                    227:  * @n = set value if !=NULL
1.6.2.4 ! misho     228:  * @be = byte order [-1 little endian, 1 big endian and 0 host order]
1.2       misho     229:  * return: -1 error or get value
                    230:  */
                    231: uint16_t
1.4       misho     232: rpack_uint16(rpack_t * __restrict rp, uint16_t * __restrict n, int be)
1.2       misho     233: {
                    234:        uint16_t u;
                    235:        uint8_t *next;
                    236: 
                    237:        if (!RPACK_SANITY(rp))
                    238:                return (uint16_t) -1;
                    239:        /* No space left */
                    240:        if (!(next = rpack_align_and_reserve(rp, sizeof(uint16_t))))
                    241:                return (uint16_t) -1;
                    242: 
1.6.2.4 ! misho     243:        if (be < 0)
        !           244:                u = EXTRACT_LE_16(next);
        !           245:        else if (be > 0)
        !           246:                u = EXTRACT_BE_16(next);
        !           247:        else
        !           248: #if BYTE_ORDER == BIG_ENDIAN
        !           249:                u = EXTRACT_BE_16(next);
        !           250: #else
        !           251:                u = EXTRACT_LE_16(next);
        !           252: #endif
1.2       misho     253:        if (n)
                    254:                RPACK_SET_16(next, n);
                    255: 
                    256:        rp->r_next = next + sizeof(uint16_t);
                    257:        return u;
                    258: }
                    259: 
                    260: /*
                    261:  * rpack_uint24() - Pack/Unpack 24bit value
                    262:  *
                    263:  * @rp = raw buffer
                    264:  * @n = set value if !=NULL
1.6.2.4 ! misho     265:  * @be = byte order [-1 little endian, 1 big endian and 0 host order]
1.2       misho     266:  * return: -1 error or get value
                    267:  */
                    268: uint32_t
1.4       misho     269: rpack_uint24(rpack_t * __restrict rp, uint32_t * __restrict n, int be)
1.2       misho     270: {
                    271:        uint32_t u;
                    272:        uint8_t *next;
                    273: 
                    274:        if (!RPACK_SANITY(rp))
                    275:                return (uint32_t) -1;
                    276:        /* No space left */
                    277:        if (!(next = rpack_align_and_reserve(rp, sizeof(uint32_t))))
                    278:                return (uint32_t) -1;
                    279: 
1.6.2.4 ! misho     280:        if (be < 0)
        !           281:                u = EXTRACT_LE_24(next);
        !           282:        else if (be > 0)
        !           283:                u = EXTRACT_BE_24(next);
        !           284:        else
        !           285: #if BYTE_ORDER == BIG_ENDIAN
        !           286:                u = EXTRACT_BE_24(next);
        !           287: #else
        !           288:                u = EXTRACT_LE_24(next);
        !           289: #endif
1.2       misho     290:        if (n)
                    291:                RPACK_SET_24(next, n);
                    292: 
                    293:        rp->r_next = next + sizeof(uint32_t);
                    294:        return u;
                    295: }
                    296: 
                    297: /*
                    298:  * rpack_uint32() - Pack/Unpack 32bit value
                    299:  *
                    300:  * @rp = raw buffer
                    301:  * @n = set value if !=NULL
1.6.2.4 ! misho     302:  * @be = byte order [-1 little endian, 1 big endian and 0 host order]
1.2       misho     303:  * return: -1 error or get value
                    304:  */
                    305: uint32_t
1.4       misho     306: rpack_uint32(rpack_t * __restrict rp, uint32_t * __restrict n, int be)
1.2       misho     307: {
                    308:        uint32_t u;
                    309:        uint8_t *next;
                    310: 
                    311:        if (!RPACK_SANITY(rp))
                    312:                return (uint32_t) -1;
                    313:        /* No space left */
                    314:        if (!(next = rpack_align_and_reserve(rp, sizeof(uint32_t))))
                    315:                return (uint32_t) -1;
                    316: 
1.6.2.4 ! misho     317:        if (be < 0)
        !           318:                u = EXTRACT_LE_32(next);
        !           319:        else if (be > 0)
        !           320:                u = EXTRACT_BE_32(next);
        !           321:        else
        !           322: #if BYTE_ORDER == BIG_ENDIAN
        !           323:                u = EXTRACT_BE_32(next);
        !           324: #else
        !           325:                u = EXTRACT_LE_32(next);
        !           326: #endif
1.2       misho     327:        if (n)
                    328:                RPACK_SET_32(next, n);
                    329: 
                    330:        rp->r_next = next + sizeof(uint32_t);
                    331:        return u;
                    332: }
                    333: 
                    334: /*
                    335:  * rpack_uint64() - Pack/Unpack 64bit value
                    336:  *
                    337:  * @rp = raw buffer
                    338:  * @n = set value if !=NULL
1.6.2.4 ! misho     339:  * @be = byte order [-1 little endian, 1 big endian and 0 host order]
1.2       misho     340:  * return: -1 error or get value
                    341:  */
                    342: uint64_t
1.4       misho     343: rpack_uint64(rpack_t * __restrict rp, uint64_t * __restrict n, int be)
1.2       misho     344: {
                    345:        uint64_t u;
                    346:        uint8_t *next;
                    347: 
                    348:        if (!RPACK_SANITY(rp))
                    349:                return (uint64_t) -1;
                    350:        /* No space left */
                    351:        if (!(next = rpack_align_and_reserve(rp, sizeof(uint64_t))))
                    352:                return (uint64_t) -1;
                    353: 
1.6.2.4 ! misho     354:        if (be < 0)
        !           355:                u = EXTRACT_LE_64(next);
        !           356:        else if (be > 0)
        !           357:                u = EXTRACT_BE_64(next);
        !           358:        else
        !           359: #if BYTE_ORDER == BIG_ENDIAN
        !           360:                u = EXTRACT_BE_64(next);
        !           361: #else
        !           362:                u = EXTRACT_LE_64(next);
        !           363: #endif
1.2       misho     364:        if (n)
                    365:                RPACK_SET_64(next, n);
                    366: 
                    367:        rp->r_next = next + sizeof(uint64_t);
                    368:        return u;
                    369: }
1.5       misho     370: 
                    371: /*
                    372:  * rpack_data() - Pack/Unpack align data
                    373:  *
                    374:  * @rp = raw buffer
                    375:  * @dat = data
                    376:  * @datlen = data length
                    377:  * return: NULL error or != NULL get data, must be e_free() after use!
                    378:  */
                    379: void *
                    380: rpack_data(rpack_t * __restrict rp, void * __restrict dat, size_t datlen)
                    381: {
                    382:        void *buf = NULL;
                    383:        uint8_t *next;
                    384: 
                    385:        if (!datlen || !RPACK_SANITY(rp))
                    386:                return NULL;
                    387:        buf = e_malloc(datlen);
                    388:        if (!buf)
                    389:                return NULL;
                    390:        /* No space left */
                    391:        if (!(next = rpack_align_and_reserve(rp, datlen))) {
                    392:                e_free(buf);
                    393:                return NULL;
                    394:        }
                    395: 
                    396:        memcpy(buf, next, datlen);
                    397:        if (dat)
                    398:                memcpy(next, dat, datlen);
                    399: 
                    400:        rp->r_next = next + datlen;
                    401:        return buf;
                    402: }
                    403: 
                    404: /*
1.6       misho     405:  * rpack_rdata() - Pack/Unpack raw data
1.5       misho     406:  *
                    407:  * @rp = raw buffer
                    408:  * @dat = data
                    409:  * @datlen = data length
                    410:  * return: NULL error or != NULL get data, must be e_free() after use!
                    411:  */
                    412: void *
1.6       misho     413: rpack_rdata(rpack_t * __restrict rp, void * __restrict dat, size_t datlen)
1.5       misho     414: {
                    415:        void *buf = NULL;
                    416: 
                    417:        if (!datlen || !RPACK_SANITY(rp))
                    418:                return NULL;
                    419:        buf = e_malloc(datlen);
                    420:        if (!buf)
                    421:                return NULL;
                    422:        /* No space left */
                    423:        if (datlen + rp->r_next - rp->r_buf > rp->r_len) {
                    424:                e_free(buf);
                    425:                return NULL;
                    426:        }
                    427: 
                    428:        memcpy(buf, rp->r_next, datlen);
                    429:        if (dat)
                    430:                memcpy(rp->r_next, dat, datlen);
                    431: 
                    432:        rp->r_next += datlen;
                    433:        return buf;
                    434: }
1.6       misho     435: 
                    436: /*
                    437:  * rpack_ruint16() - Pack/Unpack raw 16bit value
                    438:  *
                    439:  * @rp = raw buffer
                    440:  * @n = set value if !=NULL
1.6.2.4 ! misho     441:  * @be = byte order [-1 little endian, 1 big endian and 0 host order]
1.6       misho     442:  * return: -1 error or get value
                    443:  */
                    444: uint16_t
                    445: rpack_ruint16(rpack_t * __restrict rp, uint16_t * __restrict n, int be)
                    446: {
                    447:        uint16_t u;
                    448: 
                    449:        if (!RPACK_SANITY(rp))
                    450:                return (uint16_t) -1;
                    451:        /* No space left */
                    452:        if (sizeof(uint16_t) + rp->r_next - rp->r_buf > rp->r_len)
                    453:                return (uint16_t) -1;
                    454: 
1.6.2.4 ! misho     455:        if (be < 0)
        !           456:                u = EXTRACT_LE_16(rp->r_next);
        !           457:        else if (be > 0)
        !           458:                u = EXTRACT_BE_16(rp->r_next);
        !           459:        else
        !           460: #if BYTE_ORDER == BIG_ENDIAN
        !           461:                u = EXTRACT_BE_16(rp->r_next);
        !           462: #else
        !           463:                u = EXTRACT_LE_16(rp->r_next);
        !           464: #endif
1.6       misho     465:        if (n)
                    466:                RPACK_SET_16(rp->r_next, n);
                    467: 
                    468:        rp->r_next += sizeof(uint16_t);
                    469:        return u;
                    470: }
                    471: 
                    472: /*
                    473:  * rpack_ruint24() - Pack/Unpack raw 24bit value
                    474:  *
                    475:  * @rp = raw buffer
                    476:  * @n = set value if !=NULL
1.6.2.4 ! misho     477:  * @be = byte order [-1 little endian, 1 big endian and 0 host order]
1.6       misho     478:  * return: -1 error or get value
                    479:  */
                    480: uint32_t
                    481: rpack_ruint24(rpack_t * __restrict rp, uint32_t * __restrict n, int be)
                    482: {
                    483:        uint32_t u;
                    484: 
                    485:        if (!RPACK_SANITY(rp))
                    486:                return (uint32_t) -1;
                    487:        /* No space left */
                    488:        if (sizeof(uint32_t) + rp->r_next - rp->r_buf > rp->r_len)
                    489:                return (uint32_t) -1;
                    490: 
1.6.2.4 ! misho     491:        if (be < 0)
        !           492:                u = EXTRACT_LE_24(rp->r_next);
        !           493:        else if (be > 0)
        !           494:                u = EXTRACT_BE_24(rp->r_next);
        !           495:        else
        !           496: #if BYTE_ORDER == BIG_ENDIAN
        !           497:                u = EXTRACT_BE_24(rp->r_next);
        !           498: #else
        !           499:                u = EXTRACT_LE_24(rp->r_next);
        !           500: #endif
1.6       misho     501:        if (n)
                    502:                RPACK_SET_24(rp->r_next, n);
                    503: 
                    504:        rp->r_next += sizeof(uint32_t);
                    505:        return u;
                    506: }
                    507: 
                    508: /*
                    509:  * rpack_ruint32() - Pack/Unpack raw 32bit value
                    510:  *
                    511:  * @rp = raw buffer
                    512:  * @n = set value if !=NULL
1.6.2.4 ! misho     513:  * @be = byte order [-1 little endian, 1 big endian and 0 host order]
1.6       misho     514:  * return: -1 error or get value
                    515:  */
                    516: uint32_t
                    517: rpack_ruint32(rpack_t * __restrict rp, uint32_t * __restrict n, int be)
                    518: {
                    519:        uint32_t u;
                    520: 
                    521:        if (!RPACK_SANITY(rp))
                    522:                return (uint32_t) -1;
                    523:        /* No space left */
                    524:        if (sizeof(uint32_t) + rp->r_next - rp->r_buf > rp->r_len)
                    525:                return (uint32_t) -1;
                    526: 
1.6.2.4 ! misho     527:        if (be < 0)
        !           528:                u = EXTRACT_LE_32(rp->r_next);
        !           529:        else if (be > 0)
        !           530:                u = EXTRACT_BE_32(rp->r_next);
        !           531:        else
        !           532: #if BYTE_ORDER == BIG_ENDIAN
        !           533:                u = EXTRACT_BE_32(rp->r_next);
        !           534: #else
        !           535:                u = EXTRACT_LE_32(rp->r_next);
        !           536: #endif
1.6       misho     537:        if (n)
                    538:                RPACK_SET_32(rp->r_next, n);
                    539: 
                    540:        rp->r_next += sizeof(uint32_t);
                    541:        return u;
                    542: }
                    543: 
                    544: /*
                    545:  * rpack_ruint64() - Pack/Unpack raw 64bit value
                    546:  *
                    547:  * @rp = raw buffer
                    548:  * @n = set value if !=NULL
1.6.2.4 ! misho     549:  * @be = byte order [-1 little endian, 1 big endian and 0 host order]
1.6       misho     550:  * return: -1 error or get value
                    551:  */
                    552: uint64_t
                    553: rpack_ruint64(rpack_t * __restrict rp, uint64_t * __restrict n, int be)
                    554: {
                    555:        uint64_t u;
                    556: 
                    557:        if (!RPACK_SANITY(rp))
                    558:                return (uint64_t) -1;
                    559:        /* No space left */
                    560:        if (sizeof(uint64_t) + rp->r_next - rp->r_buf > rp->r_len)
                    561:                return (uint64_t) -1;
                    562: 
1.6.2.4 ! misho     563:        if (be < 0)
        !           564:                u = EXTRACT_LE_64(rp->r_next);
        !           565:        else if (be > 0)
        !           566:                u = EXTRACT_BE_64(rp->r_next);
        !           567:        else
        !           568: #if BYTE_ORDER == BIG_ENDIAN
        !           569:                u = EXTRACT_BE_64(rp->r_next);
        !           570: #else
        !           571:                u = EXTRACT_LE_64(rp->r_next);
        !           572: #endif
1.6       misho     573:        if (n)
                    574:                RPACK_SET_64(rp->r_next, n);
                    575: 
                    576:        rp->r_next += sizeof(uint64_t);
                    577:        return u;
                    578: }
1.6.2.2   misho     579: 
                    580: /*
                    581:  * rpack_next() - Get and set current position
                    582:  *
                    583:  * @rp = raw packet
1.6.2.3   misho     584:  * @after_len = move aligned current position after length
1.6.2.2   misho     585:  * return: NULL error or current position
                    586:  */
                    587: uint8_t *
                    588: rpack_next(rpack_t * __restrict rp, size_t after_len)
                    589: {
1.6.2.3   misho     590:        uint8_t *cur = NULL, *next = NULL;
                    591: 
                    592:        if (!RPACK_SANITY(rp))
                    593:                return NULL;
                    594:        /* No space left */
                    595:        if (!(next = rpack_align_and_reserve(rp, after_len)))
                    596:                return NULL;
                    597: 
                    598:        cur = rp->r_next;
                    599: 
                    600:        rp->r_next = next + after_len;
                    601:        return cur;
                    602: }
                    603: 
                    604: /*
                    605:  * rpack_rnext() - Get and set raw current position
                    606:  *
                    607:  * @rp = raw packet
                    608:  * @after_len = !=0 move current position after length
                    609:  * return: NULL error or raw current position
                    610:  */
                    611: uint8_t *
                    612: rpack_rnext(rpack_t * __restrict rp, size_t after_len)
                    613: {
1.6.2.2   misho     614:        uint8_t *next = NULL;
                    615: 
                    616:        if (!RPACK_SANITY(rp))
                    617:                return NULL;
                    618:        /* No space left */
                    619:        if (after_len + rp->r_next - rp->r_buf > rp->r_len)
                    620:                return NULL;
                    621: 
                    622:        next = rp->r_next;
                    623: 
                    624:        rp->r_next += after_len;
                    625:        return next;
                    626: }

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