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e0f8f574c7f41f5b61ec01aa290d52fc55a3f3c9
clang-p2996/lldb/source/Utility/StringExtractor.cpp
Daniel Malea e0f8f574c7 merge lldb-platform-work branch (and assorted fixes) into trunk 
Summary:
    This merge brings in the improved 'platform' command that knows how to
    interface with remote machines; that is, query OS/kernel information, push
    and pull files, run shell commands, etc... and implementation for the new
    communication packets that back that interface, at least on Darwin based
    operating systems via the POSIXPlatform class. Linux support is coming soon.

    Verified the test suite runs cleanly on Linux (x86_64), build OK on Mac OS
    X Mountain Lion.

    Additional improvements (not in the source SVN branch 'lldb-platform-work'):
    - cmake build scripts for lldb-platform
    - cleanup test suite
    - documentation stub for qPlatform_RunCommand
    - use log class instead of printf() directly
    - reverted work-in-progress-looking changes from test/types/TestAbstract.py that work towards running the test suite remotely.
    - add new logging category 'platform'

    Reviewers: Matt Kopec, Greg Clayton

    Review: http://llvm-reviews.chandlerc.com/D1493

llvm-svn: 189295
2013-08-26 23:57:52 +00:00

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//===-- StringExtractor.cpp -------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "Utility/StringExtractor.h"
// C Includes
#include <stdlib.h>
// C++ Includes
// Other libraries and framework includes
// Project includes
static const uint8_t
g_hex_ascii_to_hex_integer[256] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
0x8, 0x9, 255, 255, 255, 255, 255, 255,
255, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
};
static inline int
xdigit_to_sint (char ch)
{
if (ch >= 'a' && ch <= 'f')
return 10 + ch - 'a';
if (ch >= 'A' && ch <= 'F')
return 10 + ch - 'A';
return ch - '0';
}
static inline unsigned int
xdigit_to_uint (uint8_t ch)
{
if (ch >= 'a' && ch <= 'f')
return 10u + ch - 'a';
if (ch >= 'A' && ch <= 'F')
return 10u + ch - 'A';
return ch - '0';
}
//----------------------------------------------------------------------
// StringExtractor constructor
//----------------------------------------------------------------------
StringExtractor::StringExtractor() :
m_packet(),
m_index (0)
{
}
StringExtractor::StringExtractor(const char *packet_cstr) :
m_packet(),
m_index (0)
{
if (packet_cstr)
m_packet.assign (packet_cstr);
}
//----------------------------------------------------------------------
// StringExtractor copy constructor
//----------------------------------------------------------------------
StringExtractor::StringExtractor(const StringExtractor& rhs) :
m_packet (rhs.m_packet),
m_index (rhs.m_index)
{
}
//----------------------------------------------------------------------
// StringExtractor assignment operator
//----------------------------------------------------------------------
const StringExtractor&
StringExtractor::operator=(const StringExtractor& rhs)
{
if (this != &rhs)
{
m_packet = rhs.m_packet;
m_index = rhs.m_index;
}
return *this;
}
//----------------------------------------------------------------------
// Destructor
//----------------------------------------------------------------------
StringExtractor::~StringExtractor()
{
}
char
StringExtractor::GetChar (char fail_value)
{
if (m_index < m_packet.size())
{
char ch = m_packet[m_index];
++m_index;
return ch;
}
m_index = UINT64_MAX;
return fail_value;
}
//----------------------------------------------------------------------
// Extract an unsigned character from two hex ASCII chars in the packet
// string
//----------------------------------------------------------------------
uint8_t
StringExtractor::GetHexU8 (uint8_t fail_value, bool set_eof_on_fail)
{
uint32_t i = m_index;
if ((i + 2) <= m_packet.size())
{
const uint8_t hi_nibble = g_hex_ascii_to_hex_integer[static_cast<uint8_t>(m_packet[i])];
const uint8_t lo_nibble = g_hex_ascii_to_hex_integer[static_cast<uint8_t>(m_packet[i+1])];
if (hi_nibble < 16 && lo_nibble < 16)
{
m_index += 2;
return (hi_nibble << 4) + lo_nibble;
}
}
if (set_eof_on_fail || m_index >= m_packet.size())
m_index = UINT64_MAX;
return fail_value;
}
uint32_t
StringExtractor::GetU32 (uint32_t fail_value, int base)
{
if (m_index < m_packet.size())
{
char *end = NULL;
const char *start = m_packet.c_str();
const char *cstr = start + m_index;
uint32_t result = ::strtoul (cstr, &end, base);
if (end && end != cstr)
{
m_index = end - start;
return result;
}
}
return fail_value;
}
int32_t
StringExtractor::GetS32 (int32_t fail_value, int base)
{
if (m_index < m_packet.size())
{
char *end = NULL;
const char *start = m_packet.c_str();
const char *cstr = start + m_index;
int32_t result = ::strtol (cstr, &end, base);
if (end && end != cstr)
{
m_index = end - start;
return result;
}
}
return fail_value;
}
uint64_t
StringExtractor::GetU64 (uint64_t fail_value, int base)
{
if (m_index < m_packet.size())
{
char *end = NULL;
const char *start = m_packet.c_str();
const char *cstr = start + m_index;
uint64_t result = ::strtoull (cstr, &end, base);
if (end && end != cstr)
{
m_index = end - start;
return result;
}
}
return fail_value;
}
int64_t
StringExtractor::GetS64 (int64_t fail_value, int base)
{
if (m_index < m_packet.size())
{
char *end = NULL;
const char *start = m_packet.c_str();
const char *cstr = start + m_index;
int64_t result = ::strtoll (cstr, &end, base);
if (end && end != cstr)
{
m_index = end - start;
return result;
}
}
return fail_value;
}
uint32_t
StringExtractor::GetHexMaxU32 (bool little_endian, uint32_t fail_value)
{
uint32_t result = 0;
uint32_t nibble_count = 0;
if (little_endian)
{
uint32_t shift_amount = 0;
while (m_index < m_packet.size() && ::isxdigit (m_packet[m_index]))
{
// Make sure we don't exceed the size of a uint32_t...
if (nibble_count >= (sizeof(uint32_t) * 2))
{
m_index = UINT64_MAX;
return fail_value;
}
uint8_t nibble_lo;
uint8_t nibble_hi = xdigit_to_sint (m_packet[m_index]);
++m_index;
if (m_index < m_packet.size() && ::isxdigit (m_packet[m_index]))
{
nibble_lo = xdigit_to_sint (m_packet[m_index]);
++m_index;
result |= ((uint32_t)nibble_hi << (shift_amount + 4));
result |= ((uint32_t)nibble_lo << shift_amount);
nibble_count += 2;
shift_amount += 8;
}
else
{
result |= ((uint32_t)nibble_hi << shift_amount);
nibble_count += 1;
shift_amount += 4;
}
}
}
else
{
while (m_index < m_packet.size() && ::isxdigit (m_packet[m_index]))
{
// Make sure we don't exceed the size of a uint32_t...
if (nibble_count >= (sizeof(uint32_t) * 2))
{
m_index = UINT64_MAX;
return fail_value;
}
uint8_t nibble = xdigit_to_sint (m_packet[m_index]);
// Big Endian
result <<= 4;
result |= nibble;
++m_index;
++nibble_count;
}
}
return result;
}
uint64_t
StringExtractor::GetHexMaxU64 (bool little_endian, uint64_t fail_value)
{
uint64_t result = 0;
uint32_t nibble_count = 0;
if (little_endian)
{
uint32_t shift_amount = 0;
while (m_index < m_packet.size() && ::isxdigit (m_packet[m_index]))
{
// Make sure we don't exceed the size of a uint64_t...
if (nibble_count >= (sizeof(uint64_t) * 2))
{
m_index = UINT64_MAX;
return fail_value;
}
uint8_t nibble_lo;
uint8_t nibble_hi = xdigit_to_sint (m_packet[m_index]);
++m_index;
if (m_index < m_packet.size() && ::isxdigit (m_packet[m_index]))
{
nibble_lo = xdigit_to_sint (m_packet[m_index]);
++m_index;
result |= ((uint64_t)nibble_hi << (shift_amount + 4));
result |= ((uint64_t)nibble_lo << shift_amount);
nibble_count += 2;
shift_amount += 8;
}
else
{
result |= ((uint64_t)nibble_hi << shift_amount);
nibble_count += 1;
shift_amount += 4;
}
}
}
else
{
while (m_index < m_packet.size() && ::isxdigit (m_packet[m_index]))
{
// Make sure we don't exceed the size of a uint64_t...
if (nibble_count >= (sizeof(uint64_t) * 2))
{
m_index = UINT64_MAX;
return fail_value;
}
uint8_t nibble = xdigit_to_sint (m_packet[m_index]);
// Big Endian
result <<= 4;
result |= nibble;
++m_index;
++nibble_count;
}
}
return result;
}
size_t
StringExtractor::GetHexBytes (void *dst_void, size_t dst_len, uint8_t fail_fill_value)
{
uint8_t *dst = (uint8_t*)dst_void;
size_t bytes_extracted = 0;
while (bytes_extracted < dst_len && GetBytesLeft ())
{
dst[bytes_extracted] = GetHexU8 (fail_fill_value);
if (IsGood())
++bytes_extracted;
else
break;
}
for (size_t i = bytes_extracted; i < dst_len; ++i)
dst[i] = fail_fill_value;
return bytes_extracted;
}
// Consume ASCII hex nibble character pairs until we have decoded byte_size
// bytes of data.
uint64_t
StringExtractor::GetHexWithFixedSize (uint32_t byte_size, bool little_endian, uint64_t fail_value)
{
if (byte_size <= 8 && GetBytesLeft() >= byte_size * 2)
{
uint64_t result = 0;
uint32_t i;
if (little_endian)
{
// Little Endian
uint32_t shift_amount;
for (i = 0, shift_amount = 0;
i < byte_size && IsGood();
++i, shift_amount += 8)
{
result |= ((uint64_t)GetHexU8() << shift_amount);
}
}
else
{
// Big Endian
for (i = 0; i < byte_size && IsGood(); ++i)
{
result <<= 8;
result |= GetHexU8();
}
}
}
m_index = UINT64_MAX;
return fail_value;
}
size_t
StringExtractor::GetHexByteString (std::string &str)
{
str.clear();
char ch;
while ((ch = GetHexU8()) != '\0')
str.append(1, ch);
return str.size();
}
size_t
StringExtractor::GetHexByteStringTerminatedBy (std::string &str,
char terminator)
{
str.clear();
char ch;
while ((ch = GetHexU8(0,false)) != '\0')
str.append(1, ch);
if (Peek() && *Peek() == terminator)
return str.size();
str.clear();
return str.size();
}
bool
StringExtractor::GetNameColonValue (std::string &name, std::string &value)
{
// Read something in the form of NNNN:VVVV; where NNNN is any character
// that is not a colon, followed by a ':' character, then a value (one or
// more ';' chars), followed by a ';'
if (m_index < m_packet.size())
{
const size_t colon_idx = m_packet.find (':', m_index);
if (colon_idx != std::string::npos)
{
const size_t semicolon_idx = m_packet.find (';', colon_idx);
if (semicolon_idx != std::string::npos)
{
name.assign (m_packet, m_index, colon_idx - m_index);
value.assign (m_packet, colon_idx + 1, semicolon_idx - (colon_idx + 1));
m_index = semicolon_idx + 1;
return true;
}
}
}
m_index = UINT64_MAX;
return false;
}
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