+++ /dev/null
-/*-
- * Copyright (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved.
- * Redistribution and modifications are permitted subject to BSD license.
- */
-#include <asn_internal.h>
-#include <OBJECT_IDENTIFIER.h>
-#include <limits.h> /* for CHAR_BIT */
-#include <errno.h>
-
-/*
- * OBJECT IDENTIFIER basic type description.
- */
-static ber_tlv_tag_t asn_DEF_OBJECT_IDENTIFIER_tags[] = {
- (ASN_TAG_CLASS_UNIVERSAL | (6 << 2))
-};
-asn_TYPE_descriptor_t asn_DEF_OBJECT_IDENTIFIER = {
- "OBJECT IDENTIFIER",
- "OBJECT_IDENTIFIER",
- ASN__PRIMITIVE_TYPE_free,
- OBJECT_IDENTIFIER_print,
- OBJECT_IDENTIFIER_constraint,
- ber_decode_primitive,
- der_encode_primitive,
- OBJECT_IDENTIFIER_decode_xer,
- OBJECT_IDENTIFIER_encode_xer,
- 0, 0,
- 0, /* Use generic outmost tag fetcher */
- asn_DEF_OBJECT_IDENTIFIER_tags,
- sizeof(asn_DEF_OBJECT_IDENTIFIER_tags)
- / sizeof(asn_DEF_OBJECT_IDENTIFIER_tags[0]),
- asn_DEF_OBJECT_IDENTIFIER_tags, /* Same as above */
- sizeof(asn_DEF_OBJECT_IDENTIFIER_tags)
- / sizeof(asn_DEF_OBJECT_IDENTIFIER_tags[0]),
- 0, /* No PER visible constraints */
- 0, 0, /* No members */
- 0 /* No specifics */
-};
-
-
-int
-OBJECT_IDENTIFIER_constraint(asn_TYPE_descriptor_t *td, const void *sptr,
- asn_app_constraint_failed_f *ctfailcb, void *app_key) {
- const OBJECT_IDENTIFIER_t *st = (const OBJECT_IDENTIFIER_t *)sptr;
-
- if(st && st->buf) {
- if(st->size < 1) {
- _ASN_CTFAIL(app_key, td,
- "%s: at least one numerical value "
- "expected (%s:%d)",
- td->name, __FILE__, __LINE__);
- return -1;
- }
- } else {
- _ASN_CTFAIL(app_key, td,
- "%s: value not given (%s:%d)",
- td->name, __FILE__, __LINE__);
- return -1;
- }
-
- return 0;
-}
-
-
-int
-OBJECT_IDENTIFIER_get_single_arc(uint8_t *arcbuf, unsigned int arclen, signed int add, void *rvbufp, unsigned int rvsize) {
- unsigned LE __attribute__ ((unused)) = 1; /* Little endian (x86) */
- uint8_t *arcend = arcbuf + arclen; /* End of arc */
- unsigned int cache = 0; /* No more than 14 significant bits */
- unsigned char *rvbuf = (unsigned char *)rvbufp;
- unsigned char *rvstart = rvbuf; /* Original start of the value buffer */
- int inc; /* Return value growth direction */
-
- rvsize *= CHAR_BIT; /* bytes to bits */
- arclen *= 7; /* bytes to bits */
-
- /*
- * The arc has the number of bits
- * cannot be represented using supplied return value type.
- */
- if(arclen > rvsize) {
- if(arclen > (rvsize + CHAR_BIT)) {
- errno = ERANGE; /* Overflow */
- return -1;
- } else {
- /*
- * Even if the number of bits in the arc representation
- * is higher than the width of supplied * return value
- * type, there is still possible to fit it when there
- * are few unused high bits in the arc value
- * representaion.
- *
- * Moreover, there is a possibility that the
- * number could actually fit the arc space, given
- * that add is negative, but we don't handle
- * such "temporary lack of precision" situation here.
- * May be considered as a bug.
- */
- uint8_t mask = (0xff << (7-(arclen - rvsize))) & 0x7f;
- if((*arcbuf & mask)) {
- errno = ERANGE; /* Overflow */
- return -1;
- }
- /* Fool the routine computing unused bits */
- arclen -= 7;
- cache = *arcbuf & 0x7f;
- arcbuf++;
- }
- }
-
- /* Faster path for common size */
- if(rvsize == (CHAR_BIT * sizeof(unsigned long))) {
- unsigned long accum;
- /* Gather all bits into the accumulator */
- for(accum = cache; arcbuf < arcend; arcbuf++)
- accum = (accum << 7) | (*arcbuf & ~0x80);
- if(accum < (unsigned)-add) {
- errno = ERANGE; /* Overflow */
- return -1;
- }
- *(unsigned long *)rvbuf = accum + add; /* alignment OK! */
- return 0;
- }
-
-#ifndef WORDS_BIGENDIAN
- if(*(unsigned char *)&LE) { /* Little endian (x86) */
- /* "Convert" to big endian */
- rvbuf += rvsize / CHAR_BIT - 1;
- rvstart--;
- inc = -1; /* Descending */
- } else
-#endif /* !WORDS_BIGENDIAN */
- inc = +1; /* Big endian is known [at compile time] */
-
- {
- int bits; /* typically no more than 3-4 bits */
-
- /* Clear the high unused bits */
- for(bits = rvsize - arclen;
- bits > CHAR_BIT;
- rvbuf += inc, bits -= CHAR_BIT)
- *rvbuf = 0;
-
- /* Fill the body of a value */
- for(; arcbuf < arcend; arcbuf++) {
- cache = (cache << 7) | (*arcbuf & 0x7f);
- bits += 7;
- if(bits >= CHAR_BIT) {
- bits -= CHAR_BIT;
- *rvbuf = (cache >> bits);
- rvbuf += inc;
- }
- }
- if(bits) {
- *rvbuf = cache;
- rvbuf += inc;
- }
- }
-
- if(add) {
- for(rvbuf -= inc; rvbuf != rvstart; rvbuf -= inc) {
- int v = add + *rvbuf;
- if(v & (-1 << CHAR_BIT)) {
- *rvbuf = (unsigned char)(v + (1 << CHAR_BIT));
- add = -1;
- } else {
- *rvbuf = v;
- break;
- }
- }
- if(rvbuf == rvstart) {
- /* No space to carry over */
- errno = ERANGE; /* Overflow */
- return -1;
- }
- }
-
- return 0;
-}
-
-ssize_t
-OBJECT_IDENTIFIER__dump_arc(uint8_t *arcbuf, int arclen, int add,
- asn_app_consume_bytes_f *cb, void *app_key) {
- char scratch[64]; /* Conservative estimate */
- unsigned long accum; /* Bits accumulator */
- char *p; /* Position in the scratch buffer */
-
- if(OBJECT_IDENTIFIER_get_single_arc(arcbuf, arclen, add,
- &accum, sizeof(accum)))
- return -1;
-
- if(accum) {
- ssize_t len;
-
- /* Fill the scratch buffer in reverse. */
- p = scratch + sizeof(scratch);
- for(; accum; accum /= 10)
- *(--p) = (char)(accum % 10) + 0x30; /* Put a digit */
-
- len = sizeof(scratch) - (p - scratch);
- if(cb(p, len, app_key) < 0)
- return -1;
- return len;
- } else {
- *scratch = 0x30;
- if(cb(scratch, 1, app_key) < 0)
- return -1;
- return 1;
- }
-}
-
-int
-OBJECT_IDENTIFIER_print_arc(uint8_t *arcbuf, int arclen, int add,
- asn_app_consume_bytes_f *cb, void *app_key) {
-
- if(OBJECT_IDENTIFIER__dump_arc(arcbuf, arclen, add, cb, app_key) < 0)
- return -1;
-
- return 0;
-}
-
-static ssize_t
-OBJECT_IDENTIFIER__dump_body(const OBJECT_IDENTIFIER_t *st, asn_app_consume_bytes_f *cb, void *app_key) {
- ssize_t wrote_len = 0;
- int startn;
- int add = 0;
- int i;
-
- for(i = 0, startn = 0; i < st->size; i++) {
- uint8_t b = st->buf[i];
- if((b & 0x80)) /* Continuation expected */
- continue;
-
- if(startn == 0) {
- /*
- * First two arcs are encoded through the backdoor.
- */
- if(i) {
- add = -80;
- if(cb("2", 1, app_key) < 0) return -1;
- } else if(b <= 39) {
- add = 0;
- if(cb("0", 1, app_key) < 0) return -1;
- } else if(b < 79) {
- add = -40;
- if(cb("1", 1, app_key) < 0) return -1;
- } else {
- add = -80;
- if(cb("2", 1, app_key) < 0) return -1;
- }
- wrote_len += 1;
- }
-
- if(cb(".", 1, app_key) < 0) /* Separate arcs */
- return -1;
-
- add = OBJECT_IDENTIFIER__dump_arc(&st->buf[startn],
- i - startn + 1, add, cb, app_key);
- if(add < 0) return -1;
- wrote_len += 1 + add;
- startn = i + 1;
- add = 0;
- }
-
- return wrote_len;
-}
-
-static enum xer_pbd_rval
-OBJECT_IDENTIFIER__xer_body_decode(asn_TYPE_descriptor_t *td, void *sptr, const void *chunk_buf, size_t chunk_size) {
- OBJECT_IDENTIFIER_t *st = (OBJECT_IDENTIFIER_t *)sptr;
- const char *chunk_end = (const char *)chunk_buf + chunk_size;
- const char *endptr;
- long s_arcs[10];
- long *arcs = s_arcs;
- int arcs_count;
- int ret;
-
- (void)td;
-
- arcs_count = OBJECT_IDENTIFIER_parse_arcs(
- (const char *)chunk_buf, chunk_size, arcs,
- sizeof(s_arcs)/sizeof(s_arcs[0]), &endptr);
- if(arcs_count <= 0) {
- /* Expecting more than zero arcs */
- return XPBD_BROKEN_ENCODING;
- }
- if(endptr < chunk_end) {
- /* We have a tail of unrecognized data. Check its safety. */
- if(!xer_is_whitespace(endptr, chunk_end - endptr))
- return XPBD_BROKEN_ENCODING;
- }
-
- if((size_t)arcs_count > sizeof(s_arcs)/sizeof(s_arcs[0])) {
- arcs = (long *)MALLOC(arcs_count * sizeof(long));
- if(!arcs) return XPBD_SYSTEM_FAILURE;
- ret = OBJECT_IDENTIFIER_parse_arcs(
- (const char *)chunk_buf, chunk_size,
- arcs, arcs_count, &endptr);
- if(ret != arcs_count)
- return XPBD_SYSTEM_FAILURE; /* assert?.. */
- }
-
- /*
- * Convert arcs into BER representation.
- */
- ret = OBJECT_IDENTIFIER_set_arcs(st, arcs, sizeof(*arcs), arcs_count);
- if(arcs != s_arcs) FREEMEM(arcs);
-
- return ret ? XPBD_SYSTEM_FAILURE : XPBD_BODY_CONSUMED;
-}
-
-asn_dec_rval_t
-OBJECT_IDENTIFIER_decode_xer(asn_codec_ctx_t *opt_codec_ctx,
- asn_TYPE_descriptor_t *td, void **sptr, const char *opt_mname,
- const void *buf_ptr, size_t size) {
-
- return xer_decode_primitive(opt_codec_ctx, td,
- sptr, sizeof(OBJECT_IDENTIFIER_t), opt_mname,
- buf_ptr, size, OBJECT_IDENTIFIER__xer_body_decode);
-}
-
-asn_enc_rval_t
-OBJECT_IDENTIFIER_encode_xer(asn_TYPE_descriptor_t *td, void *sptr,
- int ilevel, enum xer_encoder_flags_e flags,
- asn_app_consume_bytes_f *cb, void *app_key) {
- const OBJECT_IDENTIFIER_t *st = (const OBJECT_IDENTIFIER_t *)sptr;
- asn_enc_rval_t er;
-
- (void)ilevel;
- (void)flags;
-
- if(!st || !st->buf)
- _ASN_ENCODE_FAILED;
-
- er.encoded = OBJECT_IDENTIFIER__dump_body(st, cb, app_key);
- if(er.encoded < 0) _ASN_ENCODE_FAILED;
-
- _ASN_ENCODED_OK(er);
-}
-
-int
-OBJECT_IDENTIFIER_print(asn_TYPE_descriptor_t *td, const void *sptr,
- int ilevel, asn_app_consume_bytes_f *cb, void *app_key) {
- const OBJECT_IDENTIFIER_t *st = (const OBJECT_IDENTIFIER_t *)sptr;
-
- (void)td; /* Unused argument */
- (void)ilevel; /* Unused argument */
-
- if(!st || !st->buf)
- return (cb("<absent>", 8, app_key) < 0) ? -1 : 0;
-
- /* Dump preamble */
- if(cb("{ ", 2, app_key) < 0)
- return -1;
-
- if(OBJECT_IDENTIFIER__dump_body(st, cb, app_key) < 0)
- return -1;
-
- return (cb(" }", 2, app_key) < 0) ? -1 : 0;
-}
-
-int
-OBJECT_IDENTIFIER_get_arcs(OBJECT_IDENTIFIER_t *oid, void *arcs,
- unsigned int arc_type_size, unsigned int arc_slots) {
- void *arcs_end = (char *)arcs + (arc_type_size * arc_slots);
- int num_arcs = 0;
- int startn = 0;
- int add = 0;
- int i;
-
- if(!oid || !oid->buf || (arc_slots && arc_type_size <= 1)) {
- errno = EINVAL;
- return -1;
- }
-
- for(i = 0; i < oid->size; i++) {
- uint8_t b = oid->buf[i];
- if((b & 0x80)) /* Continuation expected */
- continue;
-
- if(num_arcs == 0) {
- /*
- * First two arcs are encoded through the backdoor.
- */
- unsigned LE = 1; /* Little endian */
- int first_arc;
- num_arcs++;
- if(!arc_slots) { num_arcs++; continue; }
-
- if(i) first_arc = 2;
- else if(b <= 39) first_arc = 0;
- else if(b < 79) first_arc = 1;
- else first_arc = 2;
-
- add = -40 * first_arc;
- memset(arcs, 0, arc_type_size);
- *(unsigned char *)((char *)arcs
- + ((*(char *)&LE)?0:(arc_type_size - 1)))
- = first_arc;
- arcs = ((char *)arcs) + arc_type_size;
- }
-
- /* Decode, if has space */
- if(arcs < arcs_end) {
- if(OBJECT_IDENTIFIER_get_single_arc(&oid->buf[startn],
- i - startn + 1, add,
- arcs, arc_type_size))
- return -1;
- startn = i + 1;
- arcs = ((char *)arcs) + arc_type_size;
- add = 0;
- }
- num_arcs++;
- }
-
- return num_arcs;
-}
-
-
-/*
- * Save the single value as an object identifier arc.
- */
-int
-OBJECT_IDENTIFIER_set_single_arc(uint8_t *arcbuf, const void *arcval, unsigned int arcval_size, int prepared_order) {
- /*
- * The following conditions must hold:
- * assert(arcval);
- * assert(arcval_size > 0);
- * assert(arcval_size <= 16);
- * assert(arcbuf);
- */
-#ifdef WORDS_BIGENDIAN
- const unsigned isLittleEndian = 0;
-#else
- unsigned LE = 1;
- unsigned isLittleEndian = *(char *)&LE;
-#endif
- const uint8_t *tend, *tp;
- unsigned int cache;
- uint8_t *bp = arcbuf;
- int bits;
- uint8_t buffer[16];
-
- if(isLittleEndian && !prepared_order) {
- const uint8_t *a = (const unsigned char *)arcval + arcval_size - 1;
- const uint8_t *aend = (const uint8_t *)arcval;
- uint8_t *msb = buffer + arcval_size - 1;
- uint8_t *tb;
- for(tb = buffer; a >= aend; tb++, a--)
- if((*tb = *a) && (tb < msb))
- msb = tb;
- tend = &buffer[arcval_size];
- tp = msb; /* Most significant non-zero byte */
- } else {
- /* Look for most significant non-zero byte */
- tend = (const unsigned char *)arcval + arcval_size;
- for(tp = (const uint8_t *)arcval; tp < tend - 1; tp++)
- if(*tp) break;
- }
-
- /*
- * Split the value in 7-bits chunks.
- */
- bits = ((tend - tp) * CHAR_BIT) % 7;
- if(bits) {
- cache = *tp >> (CHAR_BIT - bits);
- if(cache) {
- *bp++ = cache | 0x80;
- cache = *tp++;
- bits = CHAR_BIT - bits;
- } else {
- bits = -bits;
- }
- } else {
- cache = 0;
- }
- for(; tp < tend; tp++) {
- cache = (cache << CHAR_BIT) + *tp;
- bits += CHAR_BIT;
- while(bits >= 7) {
- bits -= 7;
- *bp++ = 0x80 | (cache >> bits);
- }
- }
- if(bits) *bp++ = cache;
- bp[-1] &= 0x7f; /* Clear the last bit */
-
- return bp - arcbuf;
-}
-
-int
-OBJECT_IDENTIFIER_set_arcs(OBJECT_IDENTIFIER_t *oid, const void *arcs, unsigned int arc_type_size, unsigned int arc_slots) {
- uint8_t *buf;
- uint8_t *bp;
- unsigned LE = 1; /* Little endian (x86) */
- unsigned isLittleEndian = *((char *)&LE);
- unsigned int arc0;
- unsigned int arc1;
- unsigned size;
- unsigned i;
-
- if(!oid || !arcs || arc_type_size < 1
- || arc_type_size > 16
- || arc_slots < 2) {
- errno = EINVAL;
- return -1;
- }
-
- switch(arc_type_size) {
- case sizeof(char):
- arc0 = ((const unsigned char *)arcs)[0];
- arc1 = ((const unsigned char *)arcs)[1];
- break;
- case sizeof(short):
- arc0 = ((const unsigned short *)arcs)[0];
- arc1 = ((const unsigned short *)arcs)[1];
- break;
- case sizeof(int):
- arc0 = ((const unsigned int *)arcs)[0];
- arc1 = ((const unsigned int *)arcs)[1];
- break;
- default:
- arc1 = arc0 = 0;
- if(isLittleEndian) { /* Little endian (x86) */
- const unsigned char *ps, *pe;
- /* If more significant bytes are present,
- * make them > 255 quick */
- for(ps = (const unsigned char *)arcs + 1, pe = ps+arc_type_size;
- ps < pe; ps++)
- arc0 |= *ps, arc1 |= *(ps + arc_type_size);
- arc0 <<= CHAR_BIT, arc1 <<= CHAR_BIT;
- arc0 = *((const unsigned char *)arcs + 0);
- arc1 = *((const unsigned char *)arcs + arc_type_size);
- } else {
- const unsigned char *ps, *pe;
- /* If more significant bytes are present,
- * make them > 255 quick */
- for(ps = (const unsigned char *)arcs, pe = ps+arc_type_size - 1; ps < pe; ps++)
- arc0 |= *ps, arc1 |= *(ps + arc_type_size);
- arc0 = *((const unsigned char *)arcs + arc_type_size - 1);
- arc1 = *((const unsigned char *)arcs +(arc_type_size<< 1)-1);
- }
- }
-
- /*
- * The previous chapter left us with the first and the second arcs.
- * The values are not precise (that is, they are valid only if
- * they're less than 255), but OK for the purposes of making
- * the sanity test below.
- */
- if(arc0 <= 1) {
- if(arc1 >= 39) {
- /* 8.19.4: At most 39 subsequent values (including 0) */
- errno = ERANGE;
- return -1;
- }
- } else if(arc0 > 2) {
- /* 8.19.4: Only three values are allocated from the root node */
- errno = ERANGE;
- return -1;
- }
- /*
- * After above tests it is known that the value of arc0 is completely
- * trustworthy (0..2). However, the arc1's value is still meaningless.
- */
-
- /*
- * Roughly estimate the maximum size necessary to encode these arcs.
- * This estimation implicitly takes in account the following facts,
- * that cancel each other:
- * * the first two arcs are encoded in a single value.
- * * the first value may require more space (+1 byte)
- * * the value of the first arc which is in range (0..2)
- */
- size = ((arc_type_size * CHAR_BIT + 6) / 7) * arc_slots;
- bp = buf = (uint8_t *)MALLOC(size + 1);
- if(!buf) {
- /* ENOMEM */
- return -1;
- }
-
- /*
- * Encode the first two arcs.
- * These require special treatment.
- */
- {
- uint8_t *tp;
- uint8_t first_value[1 + 16]; /* of two arcs */
- uint8_t *fv = first_value;
-
- /*
- * Simulate first_value = arc0 * 40 + arc1;
- */
- /* Copy the second (1'st) arcs[1] into the first_value */
- *fv++ = 0;
- arcs = ((const char *)arcs) + arc_type_size;
- if(isLittleEndian) {
- const uint8_t *aend = (const unsigned char *)arcs - 1;
- const uint8_t *a1 = (const unsigned char *)arcs + arc_type_size - 1;
- for(; a1 > aend; fv++, a1--) *fv = *a1;
- } else {
- const uint8_t *a1 = (const uint8_t *)arcs;
- const uint8_t *aend = a1 + arc_type_size;
- for(; a1 < aend; fv++, a1++) *fv = *a1;
- }
- /* Increase the first_value by arc0 */
- arc0 *= 40; /* (0..80) */
- for(tp = first_value + arc_type_size; tp >= first_value; tp--) {
- unsigned int v = *tp;
- v += arc0;
- *tp = v;
- if(v >= (1 << CHAR_BIT)) arc0 = v >> CHAR_BIT;
- else break;
- }
-
- assert(tp >= first_value);
-
- bp += OBJECT_IDENTIFIER_set_single_arc(bp, first_value,
- fv - first_value, 1);
- }
-
- /*
- * Save the rest of arcs.
- */
- for(arcs = ((const char *)arcs) + arc_type_size, i = 2;
- i < arc_slots;
- i++, arcs = ((const char *)arcs) + arc_type_size) {
- bp += OBJECT_IDENTIFIER_set_single_arc(bp,
- arcs, arc_type_size, 0);
- }
-
- assert((unsigned)(bp - buf) <= size);
-
- /*
- * Replace buffer.
- */
- oid->size = bp - buf;
- bp = oid->buf;
- oid->buf = buf;
- if(bp) FREEMEM(bp);
-
- return 0;
-}
-
-
-int
-OBJECT_IDENTIFIER_parse_arcs(const char *oid_text, ssize_t oid_txt_length,
- long *arcs, unsigned int arcs_slots, const char **opt_oid_text_end) {
- unsigned int arcs_count = 0;
- const char *oid_end;
- long value = 0;
- enum {
- ST_SKIPSPACE,
- ST_WAITDIGITS, /* Next character is expected to be a digit */
- ST_DIGITS
- } state = ST_SKIPSPACE;
-
- if(!oid_text || oid_txt_length < -1 || (arcs_slots && !arcs)) {
- if(opt_oid_text_end) *opt_oid_text_end = oid_text;
- errno = EINVAL;
- return -1;
- }
-
- if(oid_txt_length == -1)
- oid_txt_length = strlen(oid_text);
-
- for(oid_end = oid_text + oid_txt_length; oid_text<oid_end; oid_text++) {
- switch(*oid_text) {
- case 0x09: case 0x0a: case 0x0d: case 0x20: /* whitespace */
- if(state == ST_SKIPSPACE) {
- continue;
- } else {
- break; /* Finish */
- }
- case 0x2e: /* '.' */
- if(state != ST_DIGITS
- || (oid_text + 1) == oid_end) {
- state = ST_WAITDIGITS;
- break;
- }
- if(arcs_count < arcs_slots)
- arcs[arcs_count] = value;
- arcs_count++;
- state = ST_WAITDIGITS;
- continue;
- case 0x30: case 0x31: case 0x32: case 0x33: case 0x34:
- case 0x35: case 0x36: case 0x37: case 0x38: case 0x39:
- if(state != ST_DIGITS) {
- state = ST_DIGITS;
- value = 0;
- }
- if(1) {
- long new_value = value * 10;
- if(new_value / 10 != value
- || (value = new_value + (*oid_text - 0x30)) < 0) {
- /* Overflow */
- state = ST_WAITDIGITS;
- break;
- }
- continue;
- }
- default:
- /* Unexpected symbols */
- state = ST_WAITDIGITS;
- break;
- } /* switch() */
- break;
- } /* for() */
-
-
- if(opt_oid_text_end) *opt_oid_text_end = oid_text;
-
- /* Finalize last arc */
- switch(state) {
- case ST_WAITDIGITS:
- errno = EINVAL;
- return -1;
- case ST_DIGITS:
- if(arcs_count < arcs_slots)
- arcs[arcs_count] = value;
- arcs_count++;
- /* Fall through */
- default:
- return arcs_count;
- }
-}
-
-
git.stg.codes / stg.git / blobdiff