comparison ext/serd/src/string.c @ 226:c5cdc9e6a4bf

Add these external library files

+/*
+  Copyright 2011-2016 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include "serd_internal.h"
+
+#include <math.h>
+
+SERD_API
+const uint8_t*
+serd_strerror(SerdStatus st)
+{
+	switch (st) {
+	case SERD_SUCCESS:        return (const uint8_t*)"Success";
+	case SERD_FAILURE:        return (const uint8_t*)"Non-fatal failure";
+	case SERD_ERR_UNKNOWN:    return (const uint8_t*)"Unknown error";
+	case SERD_ERR_BAD_SYNTAX: return (const uint8_t*)"Invalid syntax";
+	case SERD_ERR_BAD_ARG:    return (const uint8_t*)"Invalid argument";
+	case SERD_ERR_NOT_FOUND:  return (const uint8_t*)"Not found";
+	case SERD_ERR_ID_CLASH:   return (const uint8_t*)"Blank node ID clash";
+	case SERD_ERR_BAD_CURIE:  return (const uint8_t*)"Invalid CURIE";
+	case SERD_ERR_INTERNAL:   return (const uint8_t*)"Internal error";
+	}
+	return (const uint8_t*)"Unknown error";  // never reached
+}
+
+SERD_API
+size_t
+serd_strlen(const uint8_t* str, size_t* n_bytes, SerdNodeFlags* flags)
+{
+	size_t        n_chars = 0;
+	size_t        i       = 0;
+	SerdNodeFlags f       = 0;
+	for (; str[i]; ++i) {
+		if ((str[i] & 0xC0) != 0x80) {
+			// Does not start with `10', start of a new character
+			++n_chars;
+			switch (str[i]) {
+			case '\r': case '\n':
+				f |= SERD_HAS_NEWLINE;
+				break;
+			case '"':
+				f |= SERD_HAS_QUOTE;
+			}
+		}
+	}
+	if (n_bytes) {
+		*n_bytes = i;
+	}
+	if (flags) {
+		*flags = f;
+	}
+	return n_chars;
+}
+
+static inline double
+read_sign(const char** sptr)
+{
+	double sign = 1.0;
+	switch (**sptr) {
+	case '-': sign = -1.0;
+	case '+': ++(*sptr);
+	default:  return sign;
+	}
+}
+
+SERD_API
+double
+serd_strtod(const char* str, char** endptr)
+{
+	double result = 0.0;
+
+	// Point s at the first non-whitespace character
+	const char* s = str;
+	while (is_space(*s)) { ++s; }
+
+	// Read leading sign if necessary
+	const double sign = read_sign(&s);
+
+	// Parse integer part
+	for (; is_digit(*s); ++s) {
+		result = (result * 10.0) + (*s - '0');
+	}
+
+	// Parse fractional part
+	if (*s == '.') {
+		double denom = 10.0;
+		for (++s; is_digit(*s); ++s) {
+			result += (*s - '0') / denom;
+			denom *= 10.0;
+		}
+	}
+
+	// Parse exponent
+	if (*s == 'e' || *s == 'E') {
+		++s;
+		double expt      = 0.0;
+		double expt_sign = read_sign(&s);
+		for (; is_digit(*s); ++s) {
+			expt = (expt * 10.0) + (*s - '0');
+		}
+		result *= pow(10, expt * expt_sign);
+	}
+
+	if (endptr) {
+		*endptr = (char*)s;
+	}
+
+	return result * sign;
+}
+
+/**
+   Base64 decoding table.
+   This is indexed by encoded characters and returns the numeric value used
+   for decoding, shifted up by 47 to be in the range of printable ASCII.
+   A '$' is a placeholder for characters not in the base64 alphabet.
+*/
+static const char b64_unmap[] =
+	"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$m$$$ncdefghijkl$$$$$$"
+	"$/0123456789:;<=>?@ABCDEFGH$$$$$$IJKLMNOPQRSTUVWXYZ[\\]^_`ab$$$$"
+	"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$"
+	"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$";
+
+static inline uint8_t unmap(const uint8_t in) { return b64_unmap[in] - 47; }
+
+/**
+   Decode 4 base64 characters to 3 raw bytes.
+*/
+static inline size_t
+decode_chunk(const uint8_t in[4], uint8_t out[3])
+{
+	out[0] = (uint8_t)(((unmap(in[0]) << 2))        | unmap(in[1]) >> 4);
+	out[1] = (uint8_t)(((unmap(in[1]) << 4) & 0xF0) | unmap(in[2]) >> 2);
+	out[2] = (uint8_t)(((unmap(in[2]) << 6) & 0xC0) | unmap(in[3]));
+	return 1 + (in[2] != '=') + ((in[2] != '=') && (in[3] != '='));
+}
+
+SERD_API
+void*
+serd_base64_decode(const uint8_t* str, size_t len, size_t* size)
+{
+	void* buf = malloc((len * 3) / 4 + 2);
+	*size = 0;
+	for (size_t i = 0, j = 0; i < len; j += 3) {
+		uint8_t in[] = "====";
+		size_t  n_in = 0;
+		for (; i < len && n_in < 4; ++n_in) {
+			for (; i < len && !is_base64(str[i]); ++i) {}  // Skip junk
+			in[n_in] = str[i++];
+		}
+		if (n_in > 1) {
+			*size += decode_chunk(in, (uint8_t*)buf + j);
+		}
+	}
+	return buf;
+}