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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/installer/mini_installer/mini_string.h"
#include <windows.h>
namespace {
// Returns true if the given two ASCII characters are same (ignoring case).
bool EqualASCIICharI(wchar_t a, wchar_t b) {
if (a >= L'A' && a <= L'Z')
a += (L'a' - L'A');
if (b >= L'A' && b <= L'Z')
b += (L'a' - L'A');
return (a == b);
}
} // namespace
namespace mini_installer {
// Formats a sequence of |bytes| as hex. The |str| buffer must have room for
// at least 2*|size| + 1.
bool HexEncode(const void* bytes, size_t size, wchar_t* str, size_t str_size) {
if (str_size <= (size * 2))
return false;
static const wchar_t kHexChars[] = L"0123456789ABCDEF";
str[size * 2] = L'\0';
for (size_t i = 0; i < size; ++i) {
char b = reinterpret_cast<const char*>(bytes)[i];
str[(i * 2)] = kHexChars[(b >> 4) & 0xf];
str[(i * 2) + 1] = kHexChars[b & 0xf];
}
return true;
}
size_t SafeStrLen(const wchar_t* str, size_t alloc_size) {
if (!str || !alloc_size)
return 0;
size_t len = 0;
while (--alloc_size && str[len] != L'\0')
++len;
return len;
}
bool SafeStrCopy(wchar_t* dest, size_t dest_size, const wchar_t* src) {
if (!dest || !dest_size)
return false;
wchar_t* write = dest;
for (size_t remaining = dest_size; remaining != 0; --remaining) {
if ((*write++ = *src++) == L'\0')
return true;
}
// If we fail, we do not want to leave the string with partially copied
// contents. The reason for this is that we use these strings mostly for
// named objects such as files. If we copy a partial name, then that could
// match with something we do not want it to match with.
// Furthermore, since SafeStrCopy is called from SafeStrCat, we do not
// want to mutate the string in case the caller handles the error of a
// failed concatenation. For example:
//
// wchar_t buf[5] = {0};
// if (!SafeStrCat(buf, arraysize(buf), kLongName))
// SafeStrCat(buf, arraysize(buf), kShortName);
//
// If we were to return false in the first call to SafeStrCat but still
// mutate the buffer, the buffer will be in an unexpected state.
*dest = L'\0';
return false;
}
// Safer replacement for lstrcat function.
bool SafeStrCat(wchar_t* dest, size_t dest_size, const wchar_t* src) {
// Use SafeStrLen instead of lstrlen just in case the |dest| buffer isn't
// terminated.
int str_len = SafeStrLen(dest, dest_size);
return SafeStrCopy(dest + str_len, dest_size - str_len, src);
}
bool StrEndsWith(const wchar_t* str, const wchar_t* end_str) {
if (str == NULL || end_str == NULL)
return false;
for (int i = lstrlen(str) - 1, j = lstrlen(end_str) - 1; j >= 0; --i, --j) {
if (i < 0 || !EqualASCIICharI(str[i], end_str[j]))
return false;
}
return true;
}
bool StrStartsWith(const wchar_t* str, const wchar_t* start_str) {
if (str == NULL || start_str == NULL)
return false;
for (int i = 0; start_str[i] != L'\0'; ++i) {
if (!EqualASCIICharI(str[i], start_str[i]))
return false;
}
return true;
}
const wchar_t* SearchStringI(const wchar_t* source, const wchar_t* find) {
if (!find || find[0] == L'\0')
return source;
const wchar_t* scan = source;
while (*scan) {
const wchar_t* s = scan;
const wchar_t* f = find;
while (*s && *f && EqualASCIICharI(*s, *f))
++s, ++f;
if (!*f)
return scan;
++scan;
}
return NULL;
}
bool FindTagInStr(const wchar_t* str,
const wchar_t* tag,
const wchar_t** position) {
int tag_length = ::lstrlen(tag);
const wchar_t* scan = str;
for (const wchar_t* tag_start = SearchStringI(scan, tag);
tag_start != NULL;
tag_start = SearchStringI(scan, tag)) {
scan = tag_start + tag_length;
if (*scan == L'-' || *scan == L'\0') {
if (position != NULL)
*position = tag_start;
return true;
}
}
return false;
}
wchar_t* GetNameFromPathExt(wchar_t* path, size_t size) {
if (size <= 1)
return NULL;
wchar_t* current = &path[size - 1];
while (current != path && L'\\' != *current)
--current;
return (current == path) ? NULL : (current + 1);
}
} // namespace mini_installer
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