5 * DEBUG: section 68 HTTP Content-Range Header
6 * AUTHOR: Alex Rousskov
8 * SQUID Web Proxy Cache http://www.squid-cache.org/
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36 #include "squid-old.h"
37 #include "HttpHdrContRange.h"
40 * Currently only byte ranges are supported
42 * Content-Range = "Content-Range" ":" content-range-spec
43 * content-range-spec = byte-content-range-spec
44 * byte-content-range-spec = bytes-unit SP
45 * ( byte-range-resp-spec | "*") "/"
46 * ( entity-length | "*" )
47 * byte-range-resp-spec = first-byte-pos "-" last-byte-pos
48 * entity-length = 1*DIGIT
53 #define range_spec_unknown (-1)
56 #define known_spec(s) ((s) != range_spec_unknown)
57 #define size_min(a,b) ((a) <= (b) ? (a) : (b))
58 #define size_diff(a,b) ((a) >= (b) ? ((a)-(b)) : 0)
62 /* parses range-resp-spec and inits spec, returns true on success */
64 httpHdrRangeRespSpecParseInit(HttpHdrRangeSpec
* spec
, const char *field
, int flen
)
68 spec
->offset
= spec
->length
= range_spec_unknown
;
77 /* check format, must be %d-%d */
78 if (!((p
= strchr(field
, '-')) && (p
- field
< flen
))) {
79 debugs(68, 2, "invalid (no '-') resp-range-spec near: '" << field
<< "'");
84 if (!httpHeaderParseOffset(field
, &spec
->offset
))
87 /* Additional check for BUG2155 - there MUST BE first-byte-pos and it MUST be positive*/
88 if (spec
->offset
< 0) {
89 debugs(68, 2, "invalid (no first-byte-pos or it is negative) resp-range-spec near: '" << field
<< "'");
95 /* do we have last-pos ? */
96 if (p
- field
>= flen
) {
97 debugs(68, 2, "invalid (no last-byte-pos) resp-range-spec near: '" << field
<< "'");
103 if (!httpHeaderParseOffset(p
, &last_pos
))
106 if (last_pos
< spec
->offset
) {
107 debugs(68, 2, "invalid (negative last-byte-pos) resp-range-spec near: '" << field
<< "'");
111 spec
->length
= size_diff(last_pos
+ 1, spec
->offset
);
113 /* we managed to parse, check if the result makes sence */
114 if (spec
->length
<= 0) {
115 debugs(68, 2, "invalid range (" << spec
->offset
<< " += " <<
116 (long int) spec
->length
<< ") in resp-range-spec near: '" << field
<< "'");
124 httpHdrRangeRespSpecPackInto(const HttpHdrRangeSpec
* spec
, Packer
* p
)
126 /* Ensure typecast is safe */
127 assert (spec
->length
>= 0);
129 if (!known_spec(spec
->offset
) || !known_spec(spec
->length
))
130 packerPrintf(p
, "*");
132 packerPrintf(p
, "bytes %"PRId64
"-%"PRId64
,
133 spec
->offset
, spec
->offset
+ spec
->length
- 1);
141 httpHdrContRangeCreate(void)
143 HttpHdrContRange
*r
= (HttpHdrContRange
*)memAllocate(MEM_HTTP_HDR_CONTENT_RANGE
);
144 r
->spec
.offset
= r
->spec
.length
= range_spec_unknown
;
145 r
->elength
= range_spec_unknown
;
150 httpHdrContRangeParseCreate(const char *str
)
152 HttpHdrContRange
*r
= httpHdrContRangeCreate();
154 if (!httpHdrContRangeParseInit(r
, str
)) {
155 httpHdrContRangeDestroy(r
);
162 /* returns true if ranges are valid; inits HttpHdrContRange */
164 httpHdrContRangeParseInit(HttpHdrContRange
* range
, const char *str
)
167 assert(range
&& str
);
168 debugs(68, 8, "parsing content-range field: '" << str
<< "'");
169 /* check range type */
171 if (strncasecmp(str
, "bytes ", 6))
177 if (!(p
= strchr(str
, '/')))
181 range
->spec
.offset
= range
->spec
.length
= range_spec_unknown
;
182 else if (!httpHdrRangeRespSpecParseInit(&range
->spec
, str
, p
- str
))
188 range
->elength
= range_spec_unknown
;
189 else if (!httpHeaderParseOffset(p
, &range
->elength
))
191 else if (range
->elength
<= 0) {
192 /* Additional paranoidal check for BUG2155 - entity-length MUST be > 0 */
193 debugs(68, 2, "invalid (entity-length is negative) content-range-spec near: '" << str
<< "'");
195 } else if (known_spec(range
->spec
.length
) && range
->elength
< (range
->spec
.offset
+ range
->spec
.length
)) {
196 debugs(68, 2, "invalid (range is outside entity-length) content-range-spec near: '" << str
<< "'");
200 debugs(68, 8, "parsed content-range field: " <<
201 (long int) range
->spec
.offset
<< "-" <<
202 (long int) range
->spec
.offset
+ range
->spec
.length
- 1 << " / " <<
203 (long int) range
->elength
);
209 httpHdrContRangeDestroy(HttpHdrContRange
* range
)
212 memFree(range
, MEM_HTTP_HDR_CONTENT_RANGE
);
216 httpHdrContRangeDup(const HttpHdrContRange
* range
)
218 HttpHdrContRange
*dup
;
220 dup
= httpHdrContRangeCreate();
226 httpHdrContRangePackInto(const HttpHdrContRange
* range
, Packer
* p
)
229 httpHdrRangeRespSpecPackInto(&range
->spec
, p
);
230 /* Ensure typecast is safe */
231 assert (range
->elength
>= 0);
233 if (!known_spec(range
->elength
))
234 packerPrintf(p
, "/*");
236 packerPrintf(p
, "/%"PRId64
, range
->elength
);
240 httpHdrContRangeSet(HttpHdrContRange
* cr
, HttpHdrRangeSpec spec
, int64_t ent_len
)
242 assert(cr
&& ent_len
>= 0);
244 cr
->elength
= ent_len
;