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#include <ctype.h>
#include <sqlite3.h>
static int is_token_char(int c) {
return isalnum(c) || (c != 0 && strchr("!#$%&'*+-.^_`|~", c));
}
static int is_header_ws(int c) {
return c == ' ' || c == '\t';
}
static int is_vchar(int c) {
return c >= 0x21 && c <= 0x7e;
}
// Return SQLITE_ROW if a header was extracted
// Return SQLITE_DONE if headers has been exhausted
// Return SQLITE_ERROR on malformed input
int http_next_header(const char* headers,
int size,
int* pParsed,
const char** ppName,
int* pNameSize,
const char** ppValue,
int* pValueSize) {
const char* headersEnd = headers + size;
const char* nameStart = NULL;
const char* nameEnd = NULL;
const char* valueStart = NULL;
const char* valueEnd = NULL;
const char* last = NULL;
const char* p = headers;
enum {
StateInit,
StateName,
StateNameTrailingWs,
StateValueLeadingWs,
StateValue,
StateCR,
StateCheckFold,
StateDone,
StateError,
};
int state = StateInit;
*ppName = NULL;
*pNameSize = 0;
*ppValue = NULL;
*pValueSize = 0;
if (size == 0) {
*pParsed = 0;
return SQLITE_DONE;
}
for (; p != headersEnd && state != StateDone && state != StateError; ++p) {
switch (state) {
case StateInit:
// printf("StateInit %02x %c\n", *p, isalnum(*p) ? *p : ' ');
if (*p == '\r') {
state = StateCR;
} else if (is_header_ws(*p)) {
// There shouldn't be whitespace here. Folding is handled in
// StateCR/StateCheckFold.
state = StateError;
} else {
nameStart = p;
state = StateName;
}
break;
case StateName:
// printf("StateName %02x %c\n", *p, isalnum(*p) ? *p : ' ');
if (is_token_char(*p)) {
// accept
} else if (*p == ':') {
nameEnd = p;
state = StateValueLeadingWs;
} else if (is_header_ws(*p)) {
nameEnd = p;
state = StateNameTrailingWs;
} else {
state = StateError;
}
break;
case StateNameTrailingWs:
// printf("StateNameTrailingWs %02x %c\n", *p, isalnum(*p) ? *p : ' ');
if (is_header_ws(*p)) {
// accept and skip
} else if (*p == ':') {
state = StateValueLeadingWs;
} else {
state = StateError;
}
break;
case StateValueLeadingWs:
// printf("StateValueLeadingWs %02x %c\n", *p, isalnum(*p) ? *p : ' ');
if (is_header_ws(*p)) {
// accept and skip
} else if (*p == '\r') {
// empty value
state = StateCR;
} else if (is_vchar(*p)) {
valueStart = p;
last = p;
state = StateValue;
} else {
state = StateError;
}
break;
case StateValue:
// printf("StateValue %02x %c\n", *p, isalnum(*p) ? *p : ' ');
if (is_header_ws(*p)) {
// accept but keep separate so that we can track trailing ws
} else if (*p == '\r') {
valueEnd = last + 1;
state = StateCR;
} else if (is_vchar(*p)) {
// accept
last = p;
}
break;
case StateCR:
// printf("StateCr %02x %c\n", *p, isalnum(*p) ? *p : ' ');
if (*p == '\n') {
// If there's more data, check for folding.
if (p + 1 == headers + size) {
state = StateDone;
} else {
state = StateCheckFold;
}
} else {
state = StateError;
}
break;
case StateCheckFold:
// printf("StateCheckFold %02x %c\n", *p, isalnum(*p) ? *p : ' ');
if (is_header_ws(*p)) {
state = StateValue;
} else {
state = StateDone;
--p;
}
break;
}
}
*pParsed = p - headers;
if (state != StateDone || state == StateError) {
return SQLITE_ERROR;
}
if (!nameStart) {
return SQLITE_DONE;
}
*ppName = nameStart;
*pNameSize = nameEnd - nameStart;
if (valueStart) {
*ppValue = valueStart;
*pValueSize = valueEnd - valueStart;
}
return SQLITE_ROW;
}
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