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#include "first.h"
#include "buffer.h"
#include <stdlib.h>
#include <string.h>
#include "sys-time.h" /* strftime() */
static const char hex_chars_lc[] = "0123456789abcdef";
static const char hex_chars_uc[] = "0123456789ABCDEF";
/**
* init the buffer
*
*/
__attribute_noinline__
buffer* buffer_init(void) {
buffer * const b = calloc(1, sizeof(*b));
force_assert(b);
return b;
}
buffer *buffer_init_buffer(const buffer *src) {
buffer * const b = buffer_init();
buffer_copy_string_len(b, BUF_PTR_LEN(src));
return b;
}
buffer *buffer_init_string(const char *str) {
buffer * const b = buffer_init();
buffer_copy_string(b, str);
return b;
}
void buffer_free(buffer *b) {
if (NULL == b) return;
free(b->ptr);
free(b);
}
void buffer_free_ptr(buffer *b) {
free(b->ptr);
b->ptr = NULL;
b->used = 0;
b->size = 0;
}
void buffer_move(buffer * restrict b, buffer * restrict src) {
buffer tmp;
buffer_clear(b);
tmp = *src; *src = *b; *b = tmp;
}
/* make sure buffer is at least "size" big + 1 for '\0'. keep old data */
__attribute_cold__
__attribute_noinline__
__attribute_nonnull__
__attribute_returns_nonnull__
static char* buffer_realloc(buffer * const restrict b, const size_t len) {
#define BUFFER_PIECE_SIZE 64uL /*(must be power-of-2)*/
size_t sz = (len + 1 + BUFFER_PIECE_SIZE-1) & ~(BUFFER_PIECE_SIZE-1);
force_assert(sz > len);
if ((sz & (sz-1)) && sz < INT_MAX) {/* not power-2; huge val not expected */
/*(optimizer should recognize this and use ffs or clz or equivalent)*/
const size_t psz = sz;
for (sz = 256; sz < psz; sz <<= 1) ;
}
sz |= 1; /*(extra +1 for '\0' when needed buffer size is exact power-2)*/
b->size = sz;
b->ptr = realloc(b->ptr, sz);
force_assert(NULL != b->ptr);
return b->ptr;
}
__attribute_cold__
__attribute_noinline__
__attribute_nonnull__
__attribute_returns_nonnull__
static char* buffer_alloc_replace(buffer * const restrict b, const size_t size) {
/*(discard old data so realloc() does not copy)*/
if (NULL != b->ptr) {
free(b->ptr);
b->ptr = NULL;
}
/*(note: if size larger than one lshift, use size instead of power-2)*/
const size_t bsize2x = (b->size & ~1uL) << 1;
return buffer_realloc(b, bsize2x > size ? bsize2x-1 : size);
}
char* buffer_string_prepare_copy(buffer * const b, const size_t size) {
b->used = 0;
#ifdef __COVERITY__ /*(b->ptr is not NULL if b->size is not 0)*/
force_assert(size >= b->size || b->ptr);
#endif
return (size < b->size)
? b->ptr
: buffer_alloc_replace(b, size);
}
__attribute_cold__
__attribute_noinline__
__attribute_nonnull__
__attribute_returns_nonnull__
static char* buffer_string_prepare_append_resize(buffer * const restrict b, const size_t size) {
if (b->used < 2) { /* buffer_is_blank(b) */
char * const s = buffer_string_prepare_copy(b, size);
*s = '\0'; /*(for case (1 == b->used))*/
return s;
}
/* not empty, b->used already includes a terminating 0 */
/*(note: if size larger than one lshift, use size instead of power-2)*/
const size_t bsize2x = (b->size & ~1uL) << 1;
const size_t req_size = (bsize2x - b->used > size)
? bsize2x-1
: b->used + size;
/* check for overflow: unsigned overflow is defined to wrap around */
force_assert(req_size >= b->used);
return buffer_realloc(b, req_size) + b->used - 1;
}
char* buffer_string_prepare_append(buffer * const b, const size_t size) {
const uint32_t len = b->used ? b->used-1 : 0;
return (b->size - len >= size + 1)
? b->ptr + len
: buffer_string_prepare_append_resize(b, size);
}
/*(prefer smaller code than inlining buffer_extend in many places in buffer.c)*/
__attribute_noinline__
char*
buffer_extend (buffer * const b, const size_t x)
{
/* extend buffer to append x (reallocate by power-2 (or larger), if needed)
* (combine buffer_string_prepare_append() and buffer_commit())
* (future: might make buffer.h static inline func for HTTP/1.1 performance)
* pre-sets '\0' byte and b->used (unlike buffer_string_prepare_append())*/
#if 0
char * const s = buffer_string_prepare_append(b, x);
b->used += x + (0 == b->used);
#else
const uint32_t len = b->used ? b->used-1 : 0;
char * const s = (b->size - len >= x + 1)
? b->ptr + len
: buffer_string_prepare_append_resize(b, x);
b->used = len+x+1;
#endif
s[x] = '\0';
return s;
}
void buffer_commit(buffer *b, size_t size)
{
size_t sz = b->used;
if (0 == sz) sz = 1;
if (size > 0) {
/* check for overflow: unsigned overflow is defined to wrap around */
sz += size;
force_assert(sz > size);
}
b->used = sz;
b->ptr[sz - 1] = '\0';
}
void buffer_copy_string(buffer * restrict b, const char * restrict s) {
buffer_copy_string_len(b, s, NULL != s ? strlen(s) : 0);
}
void buffer_copy_string_len(buffer * const restrict b, const char * const restrict s, const size_t len) {
b->used = len + 1;
char * const restrict d = (len < b->size)
? b->ptr
: buffer_alloc_replace(b, len);
d[len] = '\0';
memcpy(d, s, len);
}
void buffer_append_string(buffer * restrict b, const char * restrict s) {
buffer_append_string_len(b, s, NULL != s ? strlen(s) : 0);
}
/**
* append a string to the end of the buffer
*
* the resulting buffer is terminated with a '\0'
* s is treated as a un-terminated string (a \0 is handled a normal character)
*
* @param b a buffer
* @param s the string
* @param s_len size of the string (without the terminating \0)
*/
void buffer_append_string_len(buffer * const restrict b, const char * const restrict s, const size_t len) {
memcpy(buffer_extend(b, len), s, len);
}
void buffer_append_str2(buffer * const restrict b, const char * const s1, const size_t len1, const char * const s2, const size_t len2) {
char * const restrict s = buffer_extend(b, len1+len2);
#ifdef HAVE_MEMPCPY
mempcpy(mempcpy(s, s1, len1), s2, len2);
#else
memcpy(s, s1, len1);
memcpy(s+len1, s2, len2);
#endif
}
void buffer_append_str3(buffer * const restrict b, const char * const s1, const size_t len1, const char * const s2, const size_t len2, const char * const s3, const size_t len3) {
char * restrict s = buffer_extend(b, len1+len2+len3);
#ifdef HAVE_MEMPCPY
mempcpy(mempcpy(mempcpy(s, s1, len1), s2, len2), s3, len3);
#else
memcpy(s, s1, len1);
memcpy((s+=len1), s2, len2);
memcpy((s+=len2), s3, len3);
#endif
}
void buffer_append_iovec(buffer * const restrict b, const struct const_iovec * const iov, const size_t n) {
size_t len = 0;
for (size_t i = 0; i < n; ++i)
len += iov[i].iov_len;
char *s = buffer_extend(b, len);
for (size_t i = 0; i < n; ++i) {
if (0 == iov[i].iov_len) continue;
#ifdef HAVE_MEMPCPY
s = mempcpy(s, iov[i].iov_base, iov[i].iov_len);
#else
memcpy(s, iov[i].iov_base, iov[i].iov_len);
s += iov[i].iov_len;
#endif
}
}
void buffer_append_path_len(buffer * restrict b, const char * restrict a, size_t alen) {
char * restrict s = buffer_string_prepare_append(b, alen+1);
const int aslash = (alen && a[0] == '/');
if (b->used > 1 && s[-1] == '/') {
if (aslash) {
++a;
--alen;
}
}
else {
if (0 == b->used) b->used = 1;
if (!aslash) {
*s++ = '/';
++b->used;
}
}
b->used += alen;
s[alen] = '\0';
memcpy(s, a, alen);
}
void
buffer_copy_path_len2 (buffer * const restrict b, const char * const restrict s1, size_t len1, const char * const restrict s2, size_t len2)
{
/*(similar to buffer_copy_string_len(b, s1, len1) but combined allocation)*/
memcpy(buffer_string_prepare_copy(b, len1+len2+1), s1, len1);
b->used = len1 + 1; /*('\0' byte will be written below)*/
buffer_append_path_len(b, s2, len2);/*(choice: not inlined, special-cased)*/
}
void
buffer_copy_string_len_lc (buffer * const restrict b, const char * const restrict s, const size_t len)
{
char * const restrict d = buffer_string_prepare_copy(b, len);
b->used = len+1;
d[len] = '\0';
for (size_t i = 0; i < len; ++i)
d[i] = (!light_isupper(s[i])) ? s[i] : s[i] | 0x20;
}
void buffer_append_uint_hex_lc(buffer *b, uintmax_t value) {
char *buf;
unsigned int shift = 0;
{
uintmax_t copy = value;
do {
copy >>= 8;
shift += 8; /* counting bits */
} while (0 != copy);
}
buf = buffer_extend(b, shift >> 2); /*nibbles (4 bits)*/
while (shift > 0) {
shift -= 4;
*(buf++) = hex_chars_lc[(value >> shift) & 0x0F];
}
}
__attribute_nonnull__
__attribute_returns_nonnull__
static char* utostr(char buf[LI_ITOSTRING_LENGTH], uintmax_t val) {
char *cur = buf+LI_ITOSTRING_LENGTH;
do {
int mod = val % 10;
val /= 10;
/* prepend digit mod */
*(--cur) = (char) ('0' + mod);
} while (0 != val);
return cur;
}
__attribute_nonnull__
__attribute_returns_nonnull__
static char* itostr(char buf[LI_ITOSTRING_LENGTH], intmax_t val) {
/* absolute value not defined for INTMAX_MIN, but can take absolute
* value of any negative number via twos complement cast to unsigned.
* negative sign is prepended after (now unsigned) value is converted
* to string */
uintmax_t uval = val >= 0 ? (uintmax_t)val : ((uintmax_t)~val) + 1;
char *cur = utostr(buf, uval);
if (val < 0) *(--cur) = '-';
return cur;
}
void buffer_append_int(buffer *b, intmax_t val) {
char buf[LI_ITOSTRING_LENGTH];
const char * const str = itostr(buf, val);
buffer_append_string_len(b, str, buf+sizeof(buf) - str);
}
void buffer_append_strftime(buffer * const restrict b, const char * const restrict format, const struct tm * const restrict tm) {
force_assert(NULL != format);
/*(localtime_r() or gmtime_r() producing tm should not have failed)*/
if (__builtin_expect( (NULL == tm), 0)) return;
/*(expecting typical format strings to result in < 64 bytes needed;
* skipping buffer_string_space() calculation and providing fixed size)*/
size_t rv = strftime(buffer_string_prepare_append(b, 63), 64, format, tm);
/* 0 (in some apis) signals the string may have been too small;
* but the format could also just have lead to an empty string */
if (__builtin_expect( (0 == rv), 0) || __builtin_expect( (rv > 63), 0)) {
/* unexpected; give it a second try with a larger string */
rv = strftime(buffer_string_prepare_append(b, 4095), 4096, format, tm);
if (__builtin_expect( (rv > 4095), 0))/*(input format was ridiculous)*/
return;
}
/*buffer_commit(b, rv);*/
b->used += (uint32_t)rv + (0 == b->used);
}
size_t li_itostrn(char *buf, size_t buf_len, intmax_t val) {
char p_buf[LI_ITOSTRING_LENGTH];
char* const str = itostr(p_buf, val);
size_t len = (size_t)(p_buf+sizeof(p_buf)-str);
force_assert(len <= buf_len);
memcpy(buf, str, len);
return len;
}
size_t li_utostrn(char *buf, size_t buf_len, uintmax_t val) {
char p_buf[LI_ITOSTRING_LENGTH];
char* const str = utostr(p_buf, val);
size_t len = (size_t)(p_buf+sizeof(p_buf)-str);
force_assert(len <= buf_len);
memcpy(buf, str, len);
return len;
}
#define li_ntox_lc(n) ((n) <= 9 ? (n) + '0' : (n) + 'a' - 10)
/* c (char) and n (nibble) MUST be unsigned integer types */
#define li_cton(c,n) \
(((n) = (c) - '0') <= 9 || (((n) = ((c)&0xdf) - 'A') <= 5 ? ((n) += 10) : 0))
/* converts hex char (0-9, A-Z, a-z) to decimal.
* returns 0xFF on invalid input.
*/
char hex2int(unsigned char hex) {
unsigned char n;
return li_cton(hex,n) ? (char)n : 0xFF;
}
int li_hex2bin (unsigned char * const bin, const size_t binlen, const char * const hexstr, const size_t len)
{
/* validate and transform 32-byte MD5 hex string to 16-byte binary MD5,
* or 64-byte SHA-256 or SHA-512-256 hex string to 32-byte binary digest */
if (len > (binlen << 1)) return -1;
for (int i = 0, ilen = (int)len; i < ilen; i+=2) {
int hi = hexstr[i];
int lo = hexstr[i+1];
if ('0' <= hi && hi <= '9') hi -= '0';
else if ((uint32_t)(hi |= 0x20)-'a' <= 'f'-'a')hi += -'a' + 10;
else return -1;
if ('0' <= lo && lo <= '9') lo -= '0';
else if ((uint32_t)(lo |= 0x20)-'a' <= 'f'-'a')lo += -'a' + 10;
else return -1;
bin[(i >> 1)] = (unsigned char)((hi << 4) | lo);
}
return 0;
}
__attribute_noinline__
int buffer_eq_icase_ssn(const char * const a, const char * const b, const size_t len) {
for (size_t i = 0; i < len; ++i) {
unsigned int ca = ((unsigned char *)a)[i];
unsigned int cb = ((unsigned char *)b)[i];
if (ca != cb) {
ca |= 0x20;
cb |= 0x20;
if (ca != cb) return 0;
if (!light_islower(ca)) return 0;
if (!light_islower(cb)) return 0;
}
}
return 1;
}
int buffer_eq_icase_ss(const char * const a, const size_t alen, const char * const b, const size_t blen) {
/* 1 = equal; 0 = not equal */ /* short string sizes expected (< INT_MAX) */
return (alen == blen) ? buffer_eq_icase_ssn(a, b, blen) : 0;
}
int buffer_eq_icase_slen(const buffer * const b, const char * const s, const size_t slen) {
/* Note: b must be initialized, i.e. 0 != b->used; uninitialized is not eq*/
/* 1 = equal; 0 = not equal */ /* short string sizes expected (< INT_MAX) */
return (b->used == slen + 1) ? buffer_eq_icase_ssn(b->ptr, s, slen) : 0;
}
int buffer_eq_slen(const buffer * const b, const char * const s, const size_t slen) {
/* Note: b must be initialized, i.e. 0 != b->used; uninitialized is not eq*/
/* 1 = equal; 0 = not equal */ /* short string sizes expected (< INT_MAX) */
return (b->used == slen + 1 && 0 == memcmp(b->ptr, s, slen));
}
/**
* check if two buffer contain the same data
*/
int buffer_is_equal(const buffer *a, const buffer *b) {
/* 1 = equal; 0 = not equal */
return (a->used == b->used && 0 == memcmp(a->ptr, b->ptr, a->used));
}
void li_tohex_lc(char * const restrict buf, size_t buf_len, const char * const restrict s, size_t s_len) {
force_assert(2 * s_len > s_len);
force_assert(2 * s_len < buf_len);
for (size_t i = 0; i < s_len; ++i) {
buf[2*i] = hex_chars_lc[(s[i] >> 4) & 0x0F];
buf[2*i+1] = hex_chars_lc[s[i] & 0x0F];
}
buf[2*s_len] = '\0';
}
void li_tohex_uc(char * const restrict buf, size_t buf_len, const char * const restrict s, size_t s_len) {
force_assert(2 * s_len > s_len);
force_assert(2 * s_len < buf_len);
for (size_t i = 0; i < s_len; ++i) {
buf[2*i] = hex_chars_uc[(s[i] >> 4) & 0x0F];
buf[2*i+1] = hex_chars_uc[s[i] & 0x0F];
}
buf[2*s_len] = '\0';
}
void buffer_substr_replace (buffer * const restrict b, const size_t offset,
const size_t len, const buffer * const restrict replace)
{
const size_t blen = buffer_clen(b);
const size_t rlen = buffer_clen(replace);
if (rlen > len) {
buffer_extend(b, blen-len+rlen);
memmove(b->ptr+offset+rlen, b->ptr+offset+len, blen-offset-len);
}
memcpy(b->ptr+offset, replace->ptr, rlen);
if (rlen < len) {
memmove(b->ptr+offset+rlen, b->ptr+offset+len, blen-offset-len);
buffer_truncate(b, blen-len+rlen);
}
}
void buffer_append_string_encoded_hex_lc(buffer * const restrict b, const char * const restrict s, size_t len) {
unsigned char * const p = (unsigned char *)buffer_extend(b, len*2);
for (size_t i = 0; i < len; ++i) {
p[(i<<1)] = hex_chars_lc[(s[i] >> 4) & 0x0F];
p[(i<<1)+1] = hex_chars_lc[(s[i]) & 0x0F];
}
}
void buffer_append_string_encoded_hex_uc(buffer * const restrict b, const char * const restrict s, size_t len) {
unsigned char * const p = (unsigned char *)buffer_extend(b, len*2);
for (size_t i = 0; i < len; ++i) {
p[(i<<1)] = hex_chars_uc[(s[i] >> 4) & 0x0F];
p[(i<<1)+1] = hex_chars_uc[(s[i]) & 0x0F];
}
}
/* everything except: ! ( ) * - . 0-9 A-Z _ a-z */
static const char encoded_chars_rel_uri_part[] = {
/*
0 1 2 3 4 5 6 7 8 9 A B C D E F
*/
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 00 - 0F control chars */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 10 - 1F */
1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, /* 20 - 2F space " # $ % & ' + , / */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, /* 30 - 3F : ; < = > ? */
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 40 - 4F @ */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, /* 50 - 5F [ \ ] ^ */
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 60 - 6F ` */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, /* 70 - 7F { | } DEL */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 80 - 8F */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 90 - 9F */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* A0 - AF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* B0 - BF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* C0 - CF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* D0 - DF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* E0 - EF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* F0 - FF */
};
/* everything except: ! ( ) * - . / 0-9 A-Z _ a-z */
static const char encoded_chars_rel_uri[] = {
/*
0 1 2 3 4 5 6 7 8 9 A B C D E F
*/
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 00 - 0F control chars */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 10 - 1F */
1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, /* 20 - 2F space " # $ % & ' + , */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, /* 30 - 3F : ; < = > ? */
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 40 - 4F @ */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, /* 50 - 5F [ \ ] ^ */
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 60 - 6F ` */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, /* 70 - 7F { | } DEL */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 80 - 8F */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 90 - 9F */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* A0 - AF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* B0 - BF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* C0 - CF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* D0 - DF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* E0 - EF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* F0 - FF */
};
static const char encoded_chars_html[] = {
/*
0 1 2 3 4 5 6 7 8 9 A B C D E F
*/
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 00 - 0F control chars */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 10 - 1F */
0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, /* 20 - 2F " & ' */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, /* 30 - 3F < > */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 40 - 4F */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 50 - 5F */
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 60 - 6F ` */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, /* 70 - 7F DEL */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 80 - 8F */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 90 - 9F */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* A0 - AF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* B0 - BF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* C0 - CF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* D0 - DF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* E0 - EF */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* F0 - FF */
};
static const char encoded_chars_minimal_xml[] = {
/*
0 1 2 3 4 5 6 7 8 9 A B C D E F
*/
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 00 - 0F control chars */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 10 - 1F */
0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, /* 20 - 2F " & ' */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, /* 30 - 3F < > */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 40 - 4F */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 50 - 5F */
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 60 - 6F ` */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, /* 70 - 7F DEL */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 80 - 8F */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 90 - 9F */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* A0 - AF */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* B0 - BF */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* C0 - CF */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* D0 - DF */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* E0 - EF */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* F0 - FF */
};
void buffer_append_string_encoded(buffer * const restrict b, const char * const restrict s, size_t s_len, buffer_encoding_t encoding) {
unsigned char *ds, *d;
size_t d_len, ndx;
const char *map = NULL;
if (0 == s_len) return;
force_assert(NULL != s);
switch(encoding) {
case ENCODING_REL_URI:
map = encoded_chars_rel_uri;
break;
case ENCODING_REL_URI_PART:
map = encoded_chars_rel_uri_part;
break;
case ENCODING_HTML:
map = encoded_chars_html;
break;
case ENCODING_MINIMAL_XML:
map = encoded_chars_minimal_xml;
break;
}
force_assert(NULL != map);
/* count to-be-encoded-characters */
for (ds = (unsigned char *)s, d_len = 0, ndx = 0; ndx < s_len; ds++, ndx++) {
if (map[*ds & 0xFF]) {
switch(encoding) {
case ENCODING_REL_URI:
case ENCODING_REL_URI_PART:
d_len += 3;
break;
case ENCODING_HTML:
case ENCODING_MINIMAL_XML:
d_len += 6;
break;
}
} else {
d_len++;
}
}
d = (unsigned char*) buffer_extend(b, d_len);
if (d_len == s_len) { /*(short-circuit; nothing to encoded)*/
memcpy(d, s, s_len);
return;
}
for (ds = (unsigned char *)s, d_len = 0, ndx = 0; ndx < s_len; ds++, ndx++) {
if (map[*ds & 0xFF]) {
switch(encoding) {
case ENCODING_REL_URI:
case ENCODING_REL_URI_PART:
d[d_len++] = '%';
d[d_len++] = hex_chars_uc[((*ds) >> 4) & 0x0F];
d[d_len++] = hex_chars_uc[(*ds) & 0x0F];
break;
case ENCODING_HTML:
case ENCODING_MINIMAL_XML:
d[d_len++] = '&';
d[d_len++] = '#';
d[d_len++] = 'x';
d[d_len++] = hex_chars_uc[((*ds) >> 4) & 0x0F];
d[d_len++] = hex_chars_uc[(*ds) & 0x0F];
d[d_len++] = ';';
break;
}
} else {
d[d_len++] = *ds;
}
}
}
void buffer_append_string_c_escaped(buffer * const restrict b, const char * const restrict s, size_t s_len) {
unsigned char *ds, *d;
size_t d_len, ndx;
if (0 == s_len) return;
/* count to-be-encoded-characters */
for (ds = (unsigned char *)s, d_len = 0, ndx = 0; ndx < s_len; ds++, ndx++) {
if ((*ds < 0x20) /* control character */
|| (*ds >= 0x7f)) { /* DEL + non-ASCII characters */
switch (*ds) {
case '\t':
case '\r':
case '\n':
d_len += 2;
break;
default:
d_len += 4; /* \xCC */
break;
}
} else {
d_len++;
}
}
d = (unsigned char*) buffer_extend(b, d_len);
if (d_len == s_len) { /*(short-circuit; nothing to encoded)*/
memcpy(d, s, s_len);
return;
}
for (ds = (unsigned char *)s, d_len = 0, ndx = 0; ndx < s_len; ds++, ndx++) {
if ((*ds < 0x20) /* control character */
|| (*ds >= 0x7f)) { /* DEL + non-ASCII characters */
d[d_len++] = '\\';
switch (*ds) {
case '\t':
d[d_len++] = 't';
break;
case '\r':
d[d_len++] = 'r';
break;
case '\n':
d[d_len++] = 'n';
break;
default:
d[d_len++] = 'x';
d[d_len++] = hex_chars_lc[((*ds) >> 4) & 0x0F];
d[d_len++] = hex_chars_lc[(*ds) & 0x0F];
break;
}
} else {
d[d_len++] = *ds;
}
}
}
/* decodes url-special-chars inplace.
* replaces non-printable characters with '_'
* (If this is used on a portion of query string, then query string should be
* split on '&', and '+' replaced with ' ' before calling this routine)
*/
void buffer_urldecode_path(buffer * const b) {
const size_t len = buffer_clen(b);
char *src = len ? memchr(b->ptr, '%', len) : NULL;
if (NULL == src) return;
char *dst = src;
do {
/* *src == '%' */
unsigned char high = hex2int(*(src + 1));
unsigned char low = hex2int(*(src + 2));
if (0xFF != high && 0xFF != low) {
high = (high << 4) | low; /* map ctrls to '_' */
*dst = (high >= 32 && high != 127) ? high : '_';
src += 2;
} /* else ignore this '%'; leave as-is and move on */
while ((*++dst = *++src) != '%' && *src) ;
} while (*src);
b->used = (dst - b->ptr) + 1;
}
int buffer_is_valid_UTF8(const buffer *b) {
/* https://www.w3.org/International/questions/qa-forms-utf-8 */
const unsigned char *c = (unsigned char *)b->ptr;
while (*c) {
/*(note: includes ctrls)*/
if ( c[0] < 0x80 ) { ++c; continue; }
if ( 0xc2 <= c[0] && c[0] <= 0xdf
&& 0x80 <= c[1] && c[1] <= 0xbf ) { c+=2; continue; }
if ( ( ( 0xe0 == c[0]
&& 0xa0 <= c[1] && c[1] <= 0xbf)
|| ( 0xe1 <= c[0] && c[0] <= 0xef && c[0] != 0xed
&& 0x80 <= c[1] && c[1] <= 0xbf)
|| ( 0xed == c[0]
&& 0x80 <= c[1] && c[1] <= 0x9f) )
&& 0x80 <= c[2] && c[2] <= 0xbf ) { c+=3; continue; }
if ( ( ( 0xf0 == c[0]
&& 0x90 <= c[1] && c[1] <= 0xbf)
|| ( 0xf1 <= c[0] && c[0] <= 0xf3
&& 0x80 <= c[1] && c[1] <= 0xbf)
|| ( 0xf4 == c[0]
&& 0x80 <= c[1] && c[1] <= 0x8f) )
&& 0x80 <= c[2] && c[2] <= 0xbf
&& 0x80 <= c[3] && c[3] <= 0xbf ) { c+=4; continue; }
return 0; /* invalid */
}
return 1; /* valid */
}
/* - special case: empty string returns empty string
* - on windows or cygwin: replace \ with /
* - strip leading spaces
* - prepends "/" if not present already
* - resolve "/../", "//" and "/./" the usual way:
* the first one removes a preceding component, the other two
* get compressed to "/".
* - "/." and "/.." at the end are similar, but always leave a trailing
* "/"
*
* /blah/.. gets /
* /blah/../foo gets /foo
* /abc/./xyz gets /abc/xyz
* /abc//xyz gets /abc/xyz
*/
void buffer_path_simplify(buffer *b)
{
char *out = b->ptr;
char * const end = b->ptr + b->used - 1;
if (__builtin_expect( (buffer_is_blank(b)), 0)) {
buffer_blank(b);
return;
}
#if defined(__WIN32) || defined(__CYGWIN__)
/* cygwin is treating \ and / the same, so we have to that too */
for (char *p = b->ptr; *p; p++) {
if (*p == '\\') *p = '/';
}
#endif
*end = '/'; /*(end of path modified to avoid need to check '\0')*/
char *walk = out;
if (__builtin_expect( (*walk == '/'), 1)) {
/* scan to detect (potential) need for path simplification
* (repeated '/' or "/.") */
do {
if (*++walk == '.' || *walk == '/')
break;
do { ++walk; } while (*walk != '/');
} while (walk != end);
if (__builtin_expect( (walk == end), 1)) {
/* common case: no repeated '/' or "/." */
*end = '\0'; /* overwrite extra '/' added to end of path */
return;
}
out = walk-1;
}
else {
if (walk[0] == '.' && walk[1] == '/')
*out = *++walk;
else if (walk[0] == '.' && walk[1] == '.' && walk[2] == '/')
*out = *(walk += 2);
else {
while (*++walk != '/') ;
out = walk;
}
++walk;
}
while (walk <= end) {
/* previous char is '/' at this point (or start of string w/o '/') */
if (__builtin_expect( (walk[0] == '/'), 0)) {
/* skip repeated '/' (e.g. "///" -> "/") */
if (++walk < end)
continue;
else {
++out;
break;
}
}
else if (__builtin_expect( (walk[0] == '.'), 0)) {
/* handle "./" and "../" */
if (walk[1] == '.' && walk[2] == '/') {
/* handle "../" */
while (out > b->ptr && *--out != '/') ;
*out = '/'; /*(in case path had not started with '/')*/
if ((walk += 3) >= end) {
++out;
break;
}
else
continue;
}
else if (walk[1] == '/') {
/* handle "./" */
if ((walk += 2) >= end) {
++out;
break;
}
continue;
}
else {
/* accept "." if not part of "../" or "./" */
*++out = '.';
++walk;
}
}
while ((*++out = *walk++) != '/') ;
}
*out = *end = '\0'; /* overwrite extra '/' added to end of path */
b->used = (out - b->ptr) + 1;
/*buffer_truncate(b, out - b->ptr);*/
}
void buffer_to_lower(buffer * const b) {
unsigned char * const restrict s = (unsigned char *)b->ptr;
for (uint32_t i = 0; i < b->used; ++i) {
if (light_isupper(s[i])) s[i] |= 0x20;
}
}
void buffer_to_upper(buffer * const b) {
unsigned char * const restrict s = (unsigned char *)b->ptr;
for (uint32_t i = 0; i < b->used; ++i) {
if (light_islower(s[i])) s[i] &= 0xdf;
}
}