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Parse Content-Range with missing right hand side

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Fixes #144
This commit is contained in:
Justine Tunney 2021-04-01 18:51:12 -07:00
parent 7abca1531f
commit 83abd68029
6 changed files with 59 additions and 26 deletions
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19
net/http/parsehttprange.c
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@ -16,6 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.internal.h"
#include "libc/str/str.h"
#include "net/http/http.h"
@ -48,14 +49,18 @@ bool ParseHttpRange(const char *p, size_t n, long resourcelength,
}
if (n && *p == '-') {
++p, --n;
length = 0;
while (n && '0' <= *p && *p <= '9') {
if (__builtin_mul_overflow(length, 10, &length)) return false;
if (__builtin_add_overflow(length, *p - '0', &length)) return false;
++p, --n;
if (!n) {
length = MAX(start, resourcelength) - start;
} else {
length = 0;
while (n && '0' <= *p && *p <= '9') {
if (__builtin_mul_overflow(length, 10, &length)) return false;
if (__builtin_add_overflow(length, *p - '0', &length)) return false;
++p, --n;
}
if (__builtin_add_overflow(length, 1, &length)) return false;
if (__builtin_sub_overflow(length, start, &length)) return false;
}
if (__builtin_add_overflow(length, 1, &length)) return false;
if (__builtin_sub_overflow(length, start, &length)) return false;
} else if (__builtin_sub_overflow(resourcelength, start, &length)) {
return false;
}