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breakpad/src/tools/windows/converter_exe/escaping.cc
Nelson Billing a5a607b0b0 Fix clang build warnings/errors for windows symbol converter. 
Change-Id: Ib7f6e37af1466b5bed3e7d2921e0d9774394ad1e
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/1680056
Reviewed-by: Mark Mentovai <mark@chromium.org>
2019-06-27 20:02:30 +00:00

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// Copyright 2019 Google Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "tools/windows/converter_exe/escaping.h"
#include <assert.h>
#define kApb kAsciiPropertyBits
const unsigned char kAsciiPropertyBits[256] = {
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0x00
0x40, 0x68, 0x48, 0x48, 0x48, 0x48, 0x40, 0x40,
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0x10
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,
0x28, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, // 0x20
0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
0x84, 0x84, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
0x10, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x05, // 0x40
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, // 0x50
0x05, 0x05, 0x05, 0x10, 0x10, 0x10, 0x10, 0x10,
0x10, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x05, // 0x60
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, // 0x70
0x05, 0x05, 0x05, 0x10, 0x10, 0x10, 0x10, 0x40,
};
// Use !! to suppress the warning C4800 of forcing 'int' to 'bool'.
static inline bool ascii_isspace(unsigned char c) { return !!(kApb[c] & 0x08); }
///////////////////////////////////
// scoped_array
///////////////////////////////////
// scoped_array<C> is like scoped_ptr<C>, except that the caller must allocate
// with new [] and the destructor deletes objects with delete [].
//
// As with scoped_ptr<C>, a scoped_array<C> either points to an object
// or is NULL. A scoped_array<C> owns the object that it points to.
// scoped_array<T> is thread-compatible, and once you index into it,
// the returned objects have only the threadsafety guarantees of T.
//
// Size: sizeof(scoped_array<C>) == sizeof(C*)
template <class C>
class scoped_array {
public:
// The element type
typedef C element_type;
// Constructor. Defaults to intializing with NULL.
// There is no way to create an uninitialized scoped_array.
// The input parameter must be allocated with new [].
explicit scoped_array(C* p = NULL) : array_(p) { }
// Destructor. If there is a C object, delete it.
// We don't need to test ptr_ == NULL because C++ does that for us.
~scoped_array() {
enum { type_must_be_complete = sizeof(C) };
delete[] array_;
}
// Reset. Deletes the current owned object, if any.
// Then takes ownership of a new object, if given.
// this->reset(this->get()) works.
void reset(C* p = NULL) {
if (p != array_) {
enum { type_must_be_complete = sizeof(C) };
delete[] array_;
array_ = p;
}
}
// Get one element of the current object.
// Will assert() if there is no current object, or index i is negative.
C& operator[](std::ptrdiff_t i) const {
assert(i >= 0);
assert(array_ != NULL);
return array_[i];
}
// Get a pointer to the zeroth element of the current object.
// If there is no current object, return NULL.
C* get() const {
return array_;
}
// Comparison operators.
// These return whether a scoped_array and a raw pointer refer to
// the same array, not just to two different but equal arrays.
bool operator==(const C* p) const { return array_ == p; }
bool operator!=(const C* p) const { return array_ != p; }
// Swap two scoped arrays.
void swap(scoped_array& p2) {
C* tmp = array_;
array_ = p2.array_;
p2.array_ = tmp;
}
// Release an array.
// The return value is the current pointer held by this object.
// If this object holds a NULL pointer, the return value is NULL.
// After this operation, this object will hold a NULL pointer,
// and will not own the object any more.
C* release() {
C* retVal = array_;
array_ = NULL;
return retVal;
}
private:
C* array_;
// Forbid comparison of different scoped_array types.
template <class C2> bool operator==(scoped_array<C2> const& p2) const;
template <class C2> bool operator!=(scoped_array<C2> const& p2) const;
// Disallow evil constructors
scoped_array(const scoped_array&);
void operator=(const scoped_array&);
};
///////////////////////////////////
// Escape methods
///////////////////////////////////
namespace strings {
// Return a mutable char* pointing to a string's internal buffer,
// which may not be null-terminated. Writing through this pointer will
// modify the string.
//
// string_as_array(&str)[i] is valid for 0 <= i < str.size() until the
// next call to a string method that invalidates iterators.
//
// As of 2006-04, there is no standard-blessed way of getting a
// mutable reference to a string's internal buffer. However, issue 530
// (http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#530)
// proposes this as the method. According to Matt Austern, this should
// already work on all current implementations.
inline char* string_as_array(string* str) {
// DO NOT USE const_cast<char*>(str->data())! See the unittest for why.
return str->empty() ? NULL : &*str->begin();
}
int CalculateBase64EscapedLen(int input_len, bool do_padding) {
// these formulae were copied from comments that used to go with the base64
// encoding functions
int intermediate_result = 8 * input_len + 5;
assert(intermediate_result > 0); // make sure we didn't overflow
int len = intermediate_result / 6;
if (do_padding) len = ((len + 3) / 4) * 4;
return len;
}
// Base64Escape does padding, so this calculation includes padding.
int CalculateBase64EscapedLen(int input_len) {
return CalculateBase64EscapedLen(input_len, true);
}
// ----------------------------------------------------------------------
// int Base64Unescape() - base64 decoder
// int Base64Escape() - base64 encoder
// int WebSafeBase64Unescape() - Google's variation of base64 decoder
// int WebSafeBase64Escape() - Google's variation of base64 encoder
//
// Check out
// http://www.cis.ohio-state.edu/htbin/rfc/rfc2045.html for formal
// description, but what we care about is that...
// Take the encoded stuff in groups of 4 characters and turn each
// character into a code 0 to 63 thus:
// A-Z map to 0 to 25
// a-z map to 26 to 51
// 0-9 map to 52 to 61
// +(- for WebSafe) maps to 62
// /(_ for WebSafe) maps to 63
// There will be four numbers, all less than 64 which can be represented
// by a 6 digit binary number (aaaaaa, bbbbbb, cccccc, dddddd respectively).
// Arrange the 6 digit binary numbers into three bytes as such:
// aaaaaabb bbbbcccc ccdddddd
// Equals signs (one or two) are used at the end of the encoded block to
// indicate that the text was not an integer multiple of three bytes long.
// ----------------------------------------------------------------------
int Base64UnescapeInternal(const char *src, int szsrc,
char *dest, int szdest,
const signed char* unbase64) {
static const char kPad64 = '=';
int decode = 0;
int destidx = 0;
int state = 0;
unsigned int ch = 0;
unsigned int temp = 0;
// The GET_INPUT macro gets the next input character, skipping
// over any whitespace, and stopping when we reach the end of the
// string or when we read any non-data character. The arguments are
// an arbitrary identifier (used as a label for goto) and the number
// of data bytes that must remain in the input to avoid aborting the
// loop.
#define GET_INPUT(label, remain) \
label: \
--szsrc; \
ch = *src++; \
decode = unbase64[ch]; \
if (decode < 0) { \
if (ascii_isspace((char)ch) && szsrc >= remain) \
goto label; \
state = 4 - remain; \
break; \
}
// if dest is null, we're just checking to see if it's legal input
// rather than producing output. (I suspect this could just be done
// with a regexp...). We duplicate the loop so this test can be
// outside it instead of in every iteration.
if (dest) {
// This loop consumes 4 input bytes and produces 3 output bytes
// per iteration. We can't know at the start that there is enough
// data left in the string for a full iteration, so the loop may
// break out in the middle; if so 'state' will be set to the
// number of input bytes read.
while (szsrc >= 4) {
// We'll start by optimistically assuming that the next four
// bytes of the string (src[0..3]) are four good data bytes
// (that is, no nulls, whitespace, padding chars, or illegal
// chars). We need to test src[0..2] for nulls individually
// before constructing temp to preserve the property that we
// never read past a null in the string (no matter how long
// szsrc claims the string is).
if (!src[0] || !src[1] || !src[2] ||
(temp = ((unbase64[static_cast<int>(src[0])] << 18) |
(unbase64[static_cast<int>(src[1])] << 12) |
(unbase64[static_cast<int>(src[2])] << 6) |
(unbase64[static_cast<int>(src[3])]))) & 0x80000000) {
// Iff any of those four characters was bad (null, illegal,
// whitespace, padding), then temp's high bit will be set
// (because unbase64[] is -1 for all bad characters).
//
// We'll back up and resort to the slower decoder, which knows
// how to handle those cases.
GET_INPUT(first, 4);
temp = decode;
GET_INPUT(second, 3);
temp = (temp << 6) | decode;
GET_INPUT(third, 2);
temp = (temp << 6) | decode;
GET_INPUT(fourth, 1);
temp = (temp << 6) | decode;
} else {
// We really did have four good data bytes, so advance four
// characters in the string.
szsrc -= 4;
src += 4;
decode = -1;
ch = '\0';
}
// temp has 24 bits of input, so write that out as three bytes.
if (destidx+3 > szdest) return -1;
dest[destidx+2] = (char)temp;
temp >>= 8;
dest[destidx+1] = (char)temp;
temp >>= 8;
dest[destidx] = (char)temp;
destidx += 3;
}
} else {
while (szsrc >= 4) {
if (!src[0] || !src[1] || !src[2] ||
(temp = ((unbase64[static_cast<int>(src[0])] << 18) |
(unbase64[static_cast<int>(src[1])] << 12) |
(unbase64[static_cast<int>(src[2])] << 6) |
(unbase64[static_cast<int>(src[3])]))) & 0x80000000) {
GET_INPUT(first_no_dest, 4);
GET_INPUT(second_no_dest, 3);
GET_INPUT(third_no_dest, 2);
GET_INPUT(fourth_no_dest, 1);
} else {
szsrc -= 4;
src += 4;
decode = -1;
ch = '\0';
}
destidx += 3;
}
}
#undef GET_INPUT
// if the loop terminated because we read a bad character, return
// now.
if (decode < 0 && ch != '\0' && ch != kPad64 && !ascii_isspace((char)ch))
return -1;
if (ch == kPad64) {
// if we stopped by hitting an '=', un-read that character -- we'll
// look at it again when we count to check for the proper number of
// equals signs at the end.
++szsrc;
--src;
} else {
// This loop consumes 1 input byte per iteration. It's used to
// clean up the 0-3 input bytes remaining when the first, faster
// loop finishes. 'temp' contains the data from 'state' input
// characters read by the first loop.
while (szsrc > 0) {
--szsrc;
ch = *src++;
decode = unbase64[ch];
if (decode < 0) {
if (ascii_isspace((char)ch)) {
continue;
} else if (ch == '\0') {
break;
} else if (ch == kPad64) {
// back up one character; we'll read it again when we check
// for the correct number of equals signs at the end.
++szsrc;
--src;
break;
} else {
return -1;
}
}
// Each input character gives us six bits of output.
temp = (temp << 6) | decode;
++state;
if (state == 4) {
// If we've accumulated 24 bits of output, write that out as
// three bytes.
if (dest) {
if (destidx+3 > szdest) return -1;
dest[destidx+2] = (char)temp;
temp >>= 8;
dest[destidx+1] = (char)temp;
temp >>= 8;
dest[destidx] = (char)temp;
}
destidx += 3;
state = 0;
temp = 0;
}
}
}
// Process the leftover data contained in 'temp' at the end of the input.
int expected_equals = 0;
switch (state) {
case 0:
// Nothing left over; output is a multiple of 3 bytes.
break;
case 1:
// Bad input; we have 6 bits left over.
return -1;
case 2:
// Produce one more output byte from the 12 input bits we have left.
if (dest) {
if (destidx+1 > szdest) return -1;
temp >>= 4;
dest[destidx] = (char)temp;
}
++destidx;
expected_equals = 2;
break;
case 3:
// Produce two more output bytes from the 18 input bits we have left.
if (dest) {
if (destidx+2 > szdest) return -1;
temp >>= 2;
dest[destidx+1] = (char)temp;
temp >>= 8;
dest[destidx] = (char)temp;
}
destidx += 2;
expected_equals = 1;
break;
default:
// state should have no other values at this point.
fprintf(stdout, "This can't happen; base64 decoder state = %d", state);
}
// The remainder of the string should be all whitespace, mixed with
// exactly 0 equals signs, or exactly 'expected_equals' equals
// signs. (Always accepting 0 equals signs is a google extension
// not covered in the RFC.)
int equals = 0;
while (szsrc > 0 && *src) {
if (*src == kPad64)
++equals;
else if (!ascii_isspace(*src))
return -1;
--szsrc;
++src;
}
return (equals == 0 || equals == expected_equals) ? destidx : -1;
}
int Base64Unescape(const char *src, int szsrc, char *dest, int szdest) {
static const signed char UnBase64[] = {
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, 62/*+*/, -1, -1, -1, 63/*/ */,
52/*0*/, 53/*1*/, 54/*2*/, 55/*3*/, 56/*4*/, 57/*5*/, 58/*6*/, 59/*7*/,
60/*8*/, 61/*9*/, -1, -1, -1, -1, -1, -1,
-1, 0/*A*/, 1/*B*/, 2/*C*/, 3/*D*/, 4/*E*/, 5/*F*/, 6/*G*/,
7/*H*/, 8/*I*/, 9/*J*/, 10/*K*/, 11/*L*/, 12/*M*/, 13/*N*/, 14/*O*/,
15/*P*/, 16/*Q*/, 17/*R*/, 18/*S*/, 19/*T*/, 20/*U*/, 21/*V*/, 22/*W*/,
23/*X*/, 24/*Y*/, 25/*Z*/, -1, -1, -1, -1, -1,
-1, 26/*a*/, 27/*b*/, 28/*c*/, 29/*d*/, 30/*e*/, 31/*f*/, 32/*g*/,
33/*h*/, 34/*i*/, 35/*j*/, 36/*k*/, 37/*l*/, 38/*m*/, 39/*n*/, 40/*o*/,
41/*p*/, 42/*q*/, 43/*r*/, 44/*s*/, 45/*t*/, 46/*u*/, 47/*v*/, 48/*w*/,
49/*x*/, 50/*y*/, 51/*z*/, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1
};
// The above array was generated by the following code
// #include <sys/time.h>
// #include <stdlib.h>
// #include <string.h>
// main()
// {
// static const char Base64[] =
// "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
// char *pos;
// int idx, i, j;
// printf(" ");
// for (i = 0; i < 255; i += 8) {
// for (j = i; j < i + 8; j++) {
// pos = strchr(Base64, j);
// if ((pos == NULL) || (j == 0))
// idx = -1;
// else
// idx = pos - Base64;
// if (idx == -1)
// printf(" %2d, ", idx);
// else
// printf(" %2d/*%c*/,", idx, j);
// }
// printf("\n ");
// }
// }
return Base64UnescapeInternal(src, szsrc, dest, szdest, UnBase64);
}
bool Base64Unescape(const char *src, int slen, string* dest) {
// Determine the size of the output string. Base64 encodes every 3 bytes into
// 4 characters. any leftover chars are added directly for good measure.
// This is documented in the base64 RFC: http://www.ietf.org/rfc/rfc3548.txt
const int dest_len = 3 * (slen / 4) + (slen % 4);
dest->resize(dest_len);
// We are getting the destination buffer by getting the beginning of the
// string and converting it into a char *.
const int len = Base64Unescape(src, slen,
string_as_array(dest), dest->size());
if (len < 0) {
return false;
}
// could be shorter if there was padding
assert(len <= dest_len);
dest->resize(len);
return true;
}
// Base64Escape
//
// NOTE: We have to use an unsigned type for src because code built
// in the the /google tree treats characters as signed unless
// otherwised specified.
//
// TODO(who?): Move this function to use the char* type for "src"
int Base64EscapeInternal(const unsigned char *src, int szsrc,
char *dest, int szdest, const char *base64,
bool do_padding) {
static const char kPad64 = '=';
if (szsrc <= 0) return 0;
char *cur_dest = dest;
const unsigned char *cur_src = src;
// Three bytes of data encodes to four characters of cyphertext.
// So we can pump through three-byte chunks atomically.
while (szsrc > 2) { /* keep going until we have less than 24 bits */
if ((szdest -= 4) < 0) return 0;
cur_dest[0] = base64[cur_src[0] >> 2];
cur_dest[1] = base64[((cur_src[0] & 0x03) << 4) + (cur_src[1] >> 4)];
cur_dest[2] = base64[((cur_src[1] & 0x0f) << 2) + (cur_src[2] >> 6)];
cur_dest[3] = base64[cur_src[2] & 0x3f];
cur_dest += 4;
cur_src += 3;
szsrc -= 3;
}
/* now deal with the tail (<=2 bytes) */
switch (szsrc) {
case 0:
// Nothing left; nothing more to do.
break;
case 1:
// One byte left: this encodes to two characters, and (optionally)
// two pad characters to round out the four-character cypherblock.
if ((szdest -= 2) < 0) return 0;
cur_dest[0] = base64[cur_src[0] >> 2];
cur_dest[1] = base64[(cur_src[0] & 0x03) << 4];
cur_dest += 2;
if (do_padding) {
if ((szdest -= 2) < 0) return 0;
cur_dest[0] = kPad64;
cur_dest[1] = kPad64;
cur_dest += 2;
}
break;
case 2:
// Two bytes left: this encodes to three characters, and (optionally)
// one pad character to round out the four-character cypherblock.
if ((szdest -= 3) < 0) return 0;
cur_dest[0] = base64[cur_src[0] >> 2];
cur_dest[1] = base64[((cur_src[0] & 0x03) << 4) + (cur_src[1] >> 4)];
cur_dest[2] = base64[(cur_src[1] & 0x0f) << 2];
cur_dest += 3;
if (do_padding) {
if ((szdest -= 1) < 0) return 0;
cur_dest[0] = kPad64;
cur_dest += 1;
}
break;
default:
// Should not be reached: blocks of 3 bytes are handled
// in the while loop before this switch statement.
fprintf(stderr, "Logic problem? szsrc = %d", szsrc);
assert(false);
break;
}
return (cur_dest - dest);
}
static const char kBase64Chars[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const char kWebSafeBase64Chars[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
int Base64Escape(const unsigned char *src, int szsrc, char *dest, int szdest) {
return Base64EscapeInternal(src, szsrc, dest, szdest, kBase64Chars, true);
}
void Base64Escape(const unsigned char *src, int szsrc,
string* dest, bool do_padding) {
const int max_escaped_size =
CalculateBase64EscapedLen(szsrc, do_padding);
dest->clear();
dest->resize(max_escaped_size + 1, '\0');
const int escaped_len = Base64EscapeInternal(src, szsrc,
&*dest->begin(), dest->size(),
kBase64Chars,
do_padding);
assert(max_escaped_size <= escaped_len);
dest->resize(escaped_len);
}
void Base64Escape(const string& src, string* dest) {
Base64Escape(reinterpret_cast<const unsigned char*>(src.c_str()),
src.size(), dest, true);
}
////////////////////////////////////////////////////
// WebSafe methods
////////////////////////////////////////////////////
int WebSafeBase64Unescape(const char *src, int szsrc, char *dest, int szdest) {
static const signed char UnBase64[] = {
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, 62/*-*/, -1, -1,
52/*0*/, 53/*1*/, 54/*2*/, 55/*3*/, 56/*4*/, 57/*5*/, 58/*6*/, 59/*7*/,
60/*8*/, 61/*9*/, -1, -1, -1, -1, -1, -1,
-1, 0/*A*/, 1/*B*/, 2/*C*/, 3/*D*/, 4/*E*/, 5/*F*/, 6/*G*/,
7/*H*/, 8/*I*/, 9/*J*/, 10/*K*/, 11/*L*/, 12/*M*/, 13/*N*/, 14/*O*/,
15/*P*/, 16/*Q*/, 17/*R*/, 18/*S*/, 19/*T*/, 20/*U*/, 21/*V*/, 22/*W*/,
23/*X*/, 24/*Y*/, 25/*Z*/, -1, -1, -1, -1, 63/*_*/,
-1, 26/*a*/, 27/*b*/, 28/*c*/, 29/*d*/, 30/*e*/, 31/*f*/, 32/*g*/,
33/*h*/, 34/*i*/, 35/*j*/, 36/*k*/, 37/*l*/, 38/*m*/, 39/*n*/, 40/*o*/,
41/*p*/, 42/*q*/, 43/*r*/, 44/*s*/, 45/*t*/, 46/*u*/, 47/*v*/, 48/*w*/,
49/*x*/, 50/*y*/, 51/*z*/, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1
};
// The above array was generated by the following code
// #include <sys/time.h>
// #include <stdlib.h>
// #include <string.h>
// main()
// {
// static const char Base64[] =
// "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
// char *pos;
// int idx, i, j;
// printf(" ");
// for (i = 0; i < 255; i += 8) {
// for (j = i; j < i + 8; j++) {
// pos = strchr(Base64, j);
// if ((pos == NULL) || (j == 0))
// idx = -1;
// else
// idx = pos - Base64;
// if (idx == -1)
// printf(" %2d, ", idx);
// else
// printf(" %2d/*%c*/,", idx, j);
// }
// printf("\n ");
// }
// }
return Base64UnescapeInternal(src, szsrc, dest, szdest, UnBase64);
}
bool WebSafeBase64Unescape(const char *src, int slen, string* dest) {
int dest_len = 3 * (slen / 4) + (slen % 4);
dest->clear();
dest->resize(dest_len);
int len = WebSafeBase64Unescape(src, slen, &*dest->begin(), dest->size());
if (len < 0) {
dest->clear();
return false;
}
// could be shorter if there was padding
assert(len <= dest_len);
dest->resize(len);
return true;
}
bool WebSafeBase64Unescape(const string& src, string* dest) {
return WebSafeBase64Unescape(src.data(), src.size(), dest);
}
int WebSafeBase64Escape(const unsigned char *src, int szsrc, char *dest,
int szdest, bool do_padding) {
return Base64EscapeInternal(src, szsrc, dest, szdest,
kWebSafeBase64Chars, do_padding);
}
void WebSafeBase64Escape(const unsigned char *src, int szsrc,
string *dest, bool do_padding) {
const int max_escaped_size =
CalculateBase64EscapedLen(szsrc, do_padding);
dest->clear();
dest->resize(max_escaped_size + 1, '\0');
const int escaped_len = Base64EscapeInternal(src, szsrc,
&*dest->begin(), dest->size(),
kWebSafeBase64Chars,
do_padding);
assert(max_escaped_size <= escaped_len);
dest->resize(escaped_len);
}
void WebSafeBase64EscapeInternal(const string& src,
string* dest,
bool do_padding) {
int encoded_len = CalculateBase64EscapedLen(src.size());
scoped_array<char> buf(new char[encoded_len]);
int len = WebSafeBase64Escape(reinterpret_cast<const unsigned char*>(src.c_str()),
src.size(), buf.get(),
encoded_len, do_padding);
dest->assign(buf.get(), len);
}
void WebSafeBase64Escape(const string& src, string* dest) {
WebSafeBase64EscapeInternal(src, dest, false);
}
void WebSafeBase64EscapeWithPadding(const string& src, string* dest) {
WebSafeBase64EscapeInternal(src, dest, true);
}
} // namespace strings
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