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210 lines
8.4 KiB
C
210 lines
8.4 KiB
C
/* this header file comes from libowfat, http://www.fefe.de/libowfat/ */
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#ifndef SCAN_H
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#define SCAN_H
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/* sandboxing note: None of these functions call any syscalls */
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/* for size_t: */
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#include <stddef.h>
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/* for uint32_t: */
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#include <stdint.h>
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/* for time_t: */
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#include <sys/types.h>
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/* for struct timespec: */
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#include <time.h>
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#include <libowfat/compiler.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* This file declares functions used to decode / scan / unmarshal
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* integer or string values from a buffer.
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* The first argument is always the source buffer, the second argument
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* is a pointer to the destination (where to store the result). The
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* return value is number of bytes scanned successfully. */
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/* Interpret src as ASCII decimal number, write number to dest and
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* return the number of bytes that were parsed.
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* scan_ulong("23",&i) -> i=23, return 2
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* NB: leading + or - or space not accepted:
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* scan_ulong("+23",&i) -> return 0
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* scan_ulong("-23",&i) -> return 0
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* scan_ulong(" 23",&i) -> return 0
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* scan_ulong("23,42",&i) -> i=23, return 2
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* NB: 023 for octal or 0x23 for hex are not supported!
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* scan_ulong("0x23",&i) -> i=0, return 1
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* NB: will detect integer overflow and abort on excessively large
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* values, i.e. on a 32-bit system:
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* scan_ulong("4294967296",&i" -> i=429496729, return 9 */
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att_read(1) att_write(2)
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size_t scan_ulong(const char *src,unsigned long *dest) noexcept;
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att_readn(1,2) att_write(3)
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size_t scan_ulongn(const char* src,size_t n,unsigned long* dest) noexcept;
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/* Interpret src as ASCII hexadecimal number, write number to dest and
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* return the number of bytes that were parsed.
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* Note: leading '+' or '-' not accepted! */
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att_read(1) att_write(2)
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size_t scan_xlong(const char *src,unsigned long *dest) noexcept;
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att_readn(1,2) att_write(3)
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size_t scan_xlongn(const char *src,size_t n,unsigned long *dest) noexcept;
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/* interpret src as ASCII octal number, write number to dest and
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* return the number of bytes that were parsed.
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* Note: leading '+' or '-' not accepted! */
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att_read(1) att_write(2)
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size_t scan_8long(const char *src,unsigned long *dest) noexcept;
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att_readn(1,2) att_write(3)
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size_t scan_8longn(const char *src,size_t n,unsigned long *dest) noexcept;
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/* interpret src as signed ASCII decimal number, write number to dest
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* and return the number of bytes that were parsed.
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* Note: leading spaces not accepted! */
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att_read(1) att_write(2)
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size_t scan_long(const char *src,signed long *dest) noexcept;
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att_readn(1,2) att_write(3)
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size_t scan_longn(const char *src,size_t n,signed long *dest) noexcept;
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att_read(1) att_write(2)
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size_t scan_longlong(const char *src,signed long long *dest) noexcept;
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att_read(1) att_write(2)
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size_t scan_ulonglong(const char *src,unsigned long long *dest) noexcept;
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att_read(1) att_write(2)
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size_t scan_xlonglong(const char *src,unsigned long long *dest) noexcept;
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att_read(1) att_write(2)
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size_t scan_8longlong(const char *src,unsigned long long *dest) noexcept;
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att_read(1) att_write(2)
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size_t scan_uint(const char *src,unsigned int *dest) noexcept;
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att_read(1) att_write(2)
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size_t scan_xint(const char *src,unsigned int *dest) noexcept;
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att_read(1) att_write(2)
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size_t scan_8int(const char *src,unsigned int *dest) noexcept;
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att_read(1) att_write(2)
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size_t scan_int(const char *src,signed int *dest) noexcept;
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att_read(1) att_write(2)
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size_t scan_ushort(const char *src,unsigned short *dest) noexcept;
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att_read(1) att_write(2)
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size_t scan_xshort(const char *src,unsigned short *dest) noexcept;
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att_read(1) att_write(2)
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size_t scan_8short(const char *src,unsigned short *dest) noexcept;
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att_read(1) att_write(2)
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size_t scan_short(const char *src,signed short *dest) noexcept;
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/* interpret src as double precision floating point number,
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* write number to dest and return the number of bytes that were parsed */
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att_read(1) att_write(2)
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size_t scan_double(const char *in, double *dest) noexcept;
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/* if *src=='-', set *dest to -1 and return 1.
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* if *src=='+', set *dest to 1 and return 1.
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* otherwise set *dest to 1 return 0. */
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att_read(1) att_write(2)
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size_t scan_plusminus(const char *src,signed int *dest) noexcept;
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/* return the highest integer n<=limit so that isspace(in[i]) for all 0<=i<=n */
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att_pure att_readn(1,2)
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size_t scan_whitenskip(const char *in,size_t limit) noexcept;
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/* return the highest integer n<=limit so that !isspace(in[i]) for all 0<=i<=n */
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att_pure att_readn(1,2)
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size_t scan_nonwhitenskip(const char *in,size_t limit) noexcept;
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/* return the highest integer n<=limit so that in[i] is element of
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* charset (ASCIIZ string) for all 0<=i<=n */
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att_pure att_readn(1,3) att_read(2)
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size_t scan_charsetnskip(const char *in,const char *charset,size_t limit) noexcept;
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/* return the highest integer n<=limit so that in[i] is not element of
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* charset (ASCIIZ string) for all 0<=i<=n */
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att_pure att_readn(1,3) att_read(2)
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size_t scan_noncharsetnskip(const char *in,const char *charset,size_t limit) noexcept;
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/* try to parse ASCII GMT date; does not understand time zones. */
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/* example dates:
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* "Sun, 06 Nov 1994 08:49:37 GMT"
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* "Sunday, 06-Nov-94 08:49:37 GMT"
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* "Sun Nov 6 08:49:37 1994"
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*/
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att_read(1) att_write(2)
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size_t scan_httpdate(const char *in,time_t *t) noexcept;
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/* try to parse ASCII ISO-8601 date; does not understand time zones. */
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/* example date: "2014-05-27T19:22:16Z" */
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att_pure att_read(1) att_write(2)
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size_t scan_iso8601(const char* in,struct timespec* t) noexcept;
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/* some variable length encodings for integers */
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att_pure att_readn(1, 2) att_write(3)
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size_t scan_utf8(const char* in,size_t len,uint32_t* n) noexcept;
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att_pure att_readn(1, 2) att_write(3)
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size_t scan_utf8_sem(const char* in,size_t len,uint32_t* n) noexcept;
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att_pure att_readn(1, 2) att_write(3)
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size_t scan_asn1derlength(const char* in,size_t len,unsigned long long* n) noexcept;
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att_pure att_readn(1, 2) att_write(3)
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size_t scan_asn1dertag(const char* in,size_t len,unsigned long long* n) noexcept;
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/* Google protocol buffers */
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/* A protocol buffer is a sequence of (tag,value).
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* Parse each tag with scan_pb_tag, then look at the field number to see
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* which field in your struct is being sent. Integers must have type
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* 0, double type 1, strings type 2 and floats type 5. However, you
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* have to check this yourself.
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*/
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att_readn(1, 2) att_write(3)
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size_t scan_varint(const char* in, size_t len, unsigned long long* n); /* internal */
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att_readn(1, 2) att_write(3) att_write(4)
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size_t scan_pb_tag(const char* in, size_t len, size_t* fieldno,unsigned char* type);
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/* Then, depending on the field number, validate the type and call the
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* corresponding of these functions to parse the value */
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att_readn(1, 2) att_write(3)
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size_t scan_pb_type0_int(const char* in,size_t len,unsigned long long* l);
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att_readn(1, 2) att_write(3)
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size_t scan_pb_type0_sint(const char* in,size_t len,signed long long* l);
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att_readn(1, 2) att_write(3)
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size_t scan_pb_type1_double(const char* in,size_t len,double* d);
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att_readn(1, 2) att_write(3)
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size_t scan_pb_type1_fixed64(const char* in,size_t len,uint64_t* b);
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/* NOTE: scan_pb_type2_stringlen only parses the length of the string,
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* not the string itself. It will return the number of bytes parsed in
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* the length, then set slen to the value of the length integer it just
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* read, and let string point to the next byte (where the actual string
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* starts). To advance in the protocol buffer, you'll have to skip the
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* return value of this function + slen bytes.
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* This is done so you can detect too large strings and abort the
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* parsing early without having to read and allocate memory for the rest
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* (potentially gigabytes) of the data announced by one unreasonable
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* string length value. */
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att_readn(1, 2) att_write(3) att_write(4)
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size_t scan_pb_type2_stringlen(const char* in,size_t len,const char** string, size_t* slen);
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att_readn(1, 2) att_write(3)
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size_t scan_pb_type5_float(const char* in,size_t len,float* f);
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att_readn(1, 2) att_write(3)
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size_t scan_pb_type5_fixed32(const char* in,size_t len,uint32_t* b);
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/* parse a netstring, input buffer is in (len bytes).
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* if parsing is successful:
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* *dest points to string and *slen is size of string
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* return number of bytes parsed
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* else
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* return 0
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* Note: *dest will point inside the input buffer!
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*/
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att_readn(1, 2) att_write(3) att_write(4)
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size_t scan_netstring(const char* in,size_t len,char** dest,size_t* slen);
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/* internal function that might be useful independently */
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/* convert from hex ASCII, return 0 to 15 for success or -1 for failure */
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att_const
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int scan_fromhex(unsigned char c);
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#ifdef __cplusplus
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}
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#endif
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#endif
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