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Duckstation/dep/zydis/include/Zydis/Internal/String.h
Stenzek c561400a47 dep: Add Zydis
2023-08-15 14:03:59 +10:00

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/***************************************************************************************************
Zyan Disassembler Library (Zydis)
Original Author : Florian Bernd, Joel Hoener
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
***************************************************************************************************/
/**
* @file
* Provides some internal, more performant, but unsafe helper functions for the `ZyanString`
* data-type.
*
* Most of these functions are very similar to the ones in `Zycore/String.h`, but inlined and
* without optional overhead like parameter-validation checks, etc ...
*
* The `ZyanString` data-type is able to dynamically allocate memory on the heap, but as `Zydis` is
* designed to be a non-'malloc'ing library, all functions in this file assume that the instances
* they are operating on are created with a user-defined static-buffer.
*/
#ifndef ZYDIS_INTERNAL_STRING_H
#define ZYDIS_INTERNAL_STRING_H
#include <Zycore/LibC.h>
#include <Zycore/String.h>
#include <Zycore/Types.h>
#include <Zycore/Format.h>
#include <Zydis/ShortString.h>
#include <Zycore/Defines.h>
#include <Zycore/Status.h>
#include <Zycore/Vector.h>
#ifdef __cplusplus
extern "C" {
#endif
/* ============================================================================================== */
/* Enums and types */
/* ============================================================================================== */
/* ---------------------------------------------------------------------------------------------- */
/* Letter Case */
/* ---------------------------------------------------------------------------------------------- */
/**
* Defines the `ZydisLetterCase` enum.
*/
typedef enum ZydisLetterCase_
{
/**
* Uses the given text "as is".
*/
ZYDIS_LETTER_CASE_DEFAULT,
/**
* Converts the given text to lowercase letters.
*/
ZYDIS_LETTER_CASE_LOWER,
/**
* Converts the given text to uppercase letters.
*/
ZYDIS_LETTER_CASE_UPPER,
/**
* Maximum value of this enum.
*/
ZYDIS_LETTER_CASE_MAX_VALUE = ZYDIS_LETTER_CASE_UPPER,
/**
* The minimum number of bits required to represent all values of this enum.
*/
ZYDIS_LETTER_CASE_REQUIRED_BITS = ZYAN_BITS_TO_REPRESENT(ZYDIS_LETTER_CASE_MAX_VALUE)
} ZydisLetterCase;
/* ---------------------------------------------------------------------------------------------- */
/* ============================================================================================== */
/* Macros */
/* ============================================================================================== */
/* ---------------------------------------------------------------------------------------------- */
/* Internal macros */
/* ---------------------------------------------------------------------------------------------- */
/**
* Checks for a terminating '\0' character at the end of the string data.
*/
#define ZYDIS_STRING_ASSERT_NULLTERMINATION(string) \
ZYAN_ASSERT(*(char*)((ZyanU8*)(string)->vector.data + (string)->vector.size - 1) == '\0');
/**
* Writes a terminating '\0' character at the end of the string data.
*/
#define ZYDIS_STRING_NULLTERMINATE(string) \
*(char*)((ZyanU8*)(string)->vector.data + (string)->vector.size - 1) = '\0';
/* ---------------------------------------------------------------------------------------------- */
/* ============================================================================================== */
/* Internal Functions */
/* ============================================================================================== */
/* ---------------------------------------------------------------------------------------------- */
/* Appending */
/* ---------------------------------------------------------------------------------------------- */
/**
* Appends the content of the source string to the end of the destination string.
*
* @param destination The destination string.
* @param source The source string.
*
* @return A zyan status code.
*/
ZYAN_INLINE ZyanStatus ZydisStringAppend(ZyanString* destination, const ZyanStringView* source)
{
ZYAN_ASSERT(destination && source);
ZYAN_ASSERT(!destination->vector.allocator);
ZYAN_ASSERT(destination->vector.size && source->string.vector.size);
if (destination->vector.size + source->string.vector.size - 1 > destination->vector.capacity)
{
return ZYAN_STATUS_INSUFFICIENT_BUFFER_SIZE;
}
ZYAN_MEMCPY((char*)destination->vector.data + destination->vector.size - 1,
source->string.vector.data, source->string.vector.size - 1);
destination->vector.size += source->string.vector.size - 1;
ZYDIS_STRING_NULLTERMINATE(destination);
return ZYAN_STATUS_SUCCESS;
}
/**
* Appends the content of the source string to the end of the destination
* string, converting the characters to the specified letter-case.
*
* @param destination The destination string.
* @param source The source string.
* @param letter_case The desired letter-case.
*
* @return A zyan status code.
*/
ZYAN_INLINE ZyanStatus ZydisStringAppendCase(ZyanString* destination, const ZyanStringView* source,
ZydisLetterCase letter_case)
{
ZYAN_ASSERT(destination && source);
ZYAN_ASSERT(!destination->vector.allocator);
ZYAN_ASSERT(destination->vector.size && source->string.vector.size);
if (destination->vector.size + source->string.vector.size - 1 > destination->vector.capacity)
{
return ZYAN_STATUS_INSUFFICIENT_BUFFER_SIZE;
}
ZYAN_MEMCPY((char*)destination->vector.data + destination->vector.size - 1,
source->string.vector.data, source->string.vector.size - 1);
switch (letter_case)
{
case ZYDIS_LETTER_CASE_DEFAULT:
break;
case ZYDIS_LETTER_CASE_LOWER:
{
const ZyanUSize index = destination->vector.size - 1;
const ZyanUSize count = source->string.vector.size - 1;
char* s = (char*)destination->vector.data + index;
for (ZyanUSize i = index; i < index + count; ++i)
{
const char c = *s;
if ((c >= 'A') && (c <= 'Z'))
{
*s = c | 32;
}
++s;
}
break;
}
case ZYDIS_LETTER_CASE_UPPER:
{
const ZyanUSize index = destination->vector.size - 1;
const ZyanUSize count = source->string.vector.size - 1;
char* s = (char*)destination->vector.data + index;
for (ZyanUSize i = index; i < index + count; ++i)
{
const char c = *s;
if ((c >= 'a') && (c <= 'z'))
{
*s = c & ~32;
}
++s;
}
break;
}
default:
ZYAN_UNREACHABLE;
}
destination->vector.size += source->string.vector.size - 1;
ZYDIS_STRING_NULLTERMINATE(destination);
return ZYAN_STATUS_SUCCESS;
}
/**
* Appends the content of the source short-string to the end of the destination string.
*
* @param destination The destination string.
* @param source The source string.
*
* @return A zyan status code.
*/
ZYAN_INLINE ZyanStatus ZydisStringAppendShort(ZyanString* destination,
const ZydisShortString* source)
{
ZYAN_ASSERT(destination && source);
ZYAN_ASSERT(!destination->vector.allocator);
ZYAN_ASSERT(destination->vector.size && source->size);
if (destination->vector.size + source->size > destination->vector.capacity)
{
return ZYAN_STATUS_INSUFFICIENT_BUFFER_SIZE;
}
ZYAN_MEMCPY((char*)destination->vector.data + destination->vector.size - 1, source->data,
(ZyanUSize)source->size + 1);
destination->vector.size += source->size;
ZYDIS_STRING_ASSERT_NULLTERMINATION(destination);
return ZYAN_STATUS_SUCCESS;
}
/**
* Appends the content of the source short-string to the end of the destination string,
* converting the characters to the specified letter-case.
*
* @param destination The destination string.
* @param source The source string.
* @param letter_case The desired letter-case.
*
* @return A zyan status code.
*/
ZYAN_INLINE ZyanStatus ZydisStringAppendShortCase(ZyanString* destination,
const ZydisShortString* source, ZydisLetterCase letter_case)
{
ZYAN_ASSERT(destination && source);
ZYAN_ASSERT(!destination->vector.allocator);
ZYAN_ASSERT(destination->vector.size && source->size);
if (destination->vector.size + source->size > destination->vector.capacity)
{
return ZYAN_STATUS_INSUFFICIENT_BUFFER_SIZE;
}
ZYAN_MEMCPY((char*)destination->vector.data + destination->vector.size - 1, source->data,
(ZyanUSize)source->size + 1);
switch (letter_case)
{
case ZYDIS_LETTER_CASE_DEFAULT:
break;
case ZYDIS_LETTER_CASE_LOWER:
{
const ZyanUSize index = destination->vector.size - 1;
const ZyanUSize count = source->size;
char* s = (char*)destination->vector.data + index;
for (ZyanUSize i = index; i < index + count; ++i)
{
const char c = *s;
if ((c >= 'A') && (c <= 'Z'))
{
*s = c | 32;
}
++s;
}
break;
}
case ZYDIS_LETTER_CASE_UPPER:
{
const ZyanUSize index = destination->vector.size - 1;
const ZyanUSize count = source->size;
char* s = (char*)destination->vector.data + index;
for (ZyanUSize i = index; i < index + count; ++i)
{
const char c = *s;
if ((c >= 'a') && (c <= 'z'))
{
*s = c & ~32;
}
++s;
}
break;
}
default:
ZYAN_UNREACHABLE;
}
destination->vector.size += source->size;
ZYDIS_STRING_ASSERT_NULLTERMINATION(destination);
return ZYAN_STATUS_SUCCESS;
}
/* ---------------------------------------------------------------------------------------------- */
/* Formatting */
/* ---------------------------------------------------------------------------------------------- */
/**
* Formats the given unsigned ordinal `value` to its decimal text-representation and
* appends it to the `string`.
*
* @param string A pointer to the `ZyanString` instance.
* @param value The value to append.
* @param padding_length Padds the converted value with leading zeros, if the number of chars is
* less than the `padding_length`.
* @param prefix The string to use as prefix or `ZYAN_NULL`, if not needed.
* @param suffix The string to use as suffix or `ZYAN_NULL`, if not needed.
*
* @return A zyan status code.
*
* This function will fail, if the `ZYAN_STRING_IS_IMMUTABLE` flag is set for the specified
* `ZyanString` instance.
*/
ZyanStatus ZydisStringAppendDecU(ZyanString* string, ZyanU64 value, ZyanU8 padding_length,
const ZyanStringView* prefix, const ZyanStringView* suffix);
/**
* Formats the given signed ordinal `value` to its decimal text-representation and
* appends it to the `string`.
*
* @param string A pointer to the `ZyanString` instance.
* @param value The value to append.
* @param padding_length Padds the converted value with leading zeros, if the number of chars is
* less than the `padding_length`.
* @param force_sign Enable this option to print the `+` sign for positive numbers.
* @param prefix The string to use as prefix or `ZYAN_NULL`, if not needed.
* @param suffix The string to use as suffix or `ZYAN_NULL`, if not needed.
*
* @return A zyan status code.
*
* This function will fail, if the `ZYAN_STRING_IS_IMMUTABLE` flag is set for the specified
* `ZyanString` instance.
*/
ZYAN_INLINE ZyanStatus ZydisStringAppendDecS(ZyanString* string, ZyanI64 value,
ZyanU8 padding_length, ZyanBool force_sign, const ZyanStringView* prefix,
const ZyanStringView* suffix)
{
static const ZydisShortString str_add = ZYDIS_MAKE_SHORTSTRING("+");
static const ZydisShortString str_sub = ZYDIS_MAKE_SHORTSTRING("-");
if (value < 0)
{
ZYAN_CHECK(ZydisStringAppendShort(string, &str_sub));
if (prefix)
{
ZYAN_CHECK(ZydisStringAppend(string, prefix));
}
return ZydisStringAppendDecU(string, ZyanAbsI64(value), padding_length,
(const ZyanStringView*)ZYAN_NULL, suffix);
}
if (force_sign)
{
ZYAN_ASSERT(value >= 0);
ZYAN_CHECK(ZydisStringAppendShort(string, &str_add));
}
return ZydisStringAppendDecU(string, value, padding_length, prefix, suffix);
}
/**
* Formats the given unsigned ordinal `value` to its hexadecimal text-representation and
* appends it to the `string`.
*
* @param string A pointer to the `ZyanString` instance.
* @param value The value to append.
* @param padding_length Pads the converted value with leading zeros if the number of
* chars is less than the `padding_length`.
* @param force_leading_number Enable this option to prepend a leading `0` if the first
* character is non-numeric.
* @param uppercase Enable this option to use uppercase letters ('A'-'F') instead
* of lowercase ones ('a'-'f').
* @param prefix The string to use as prefix or `ZYAN_NULL`, if not needed.
* @param suffix The string to use as suffix or `ZYAN_NULL`, if not needed.
*
* @return A zyan status code.
*
* This function will fail, if the `ZYAN_STRING_IS_IMMUTABLE` flag is set for the specified
* `ZyanString` instance.
*/
ZyanStatus ZydisStringAppendHexU(ZyanString* string, ZyanU64 value, ZyanU8 padding_length,
ZyanBool force_leading_number, ZyanBool uppercase, const ZyanStringView* prefix,
const ZyanStringView* suffix);
/**
* Formats the given signed ordinal `value` to its hexadecimal text-representation and
* appends it to the `string`.
*
* @param string A pointer to the `ZyanString` instance.
* @param value The value to append.
* @param padding_length Padds the converted value with leading zeros, if the number of
* chars is less than the `padding_length` (the sign char does not
* count).
* @param force_leading_number Enable this option to prepend a leading `0`, if the first
* character is non-numeric.
* @param uppercase Enable this option to use uppercase letters ('A'-'F') instead
* of lowercase ones ('a'-'f').
* @param force_sign Enable this option to print the `+` sign for positive numbers.
* @param prefix The string to use as prefix or `ZYAN_NULL`, if not needed.
* @param suffix The string to use as suffix or `ZYAN_NULL`, if not needed.
*
* @return A zyan status code.
*
* This function will fail if the `ZYAN_STRING_IS_IMMUTABLE` flag is set for the specified
* `ZyanString` instance.
*/
ZYAN_INLINE ZyanStatus ZydisStringAppendHexS(ZyanString* string, ZyanI64 value,
ZyanU8 padding_length, ZyanBool force_leading_number, ZyanBool uppercase, ZyanBool force_sign,
const ZyanStringView* prefix, const ZyanStringView* suffix)
{
static const ZydisShortString str_add = ZYDIS_MAKE_SHORTSTRING("+");
static const ZydisShortString str_sub = ZYDIS_MAKE_SHORTSTRING("-");
if (value < 0)
{
ZYAN_CHECK(ZydisStringAppendShort(string, &str_sub));
if (prefix)
{
ZYAN_CHECK(ZydisStringAppend(string, prefix));
}
return ZydisStringAppendHexU(string, ZyanAbsI64(value), padding_length,
force_leading_number, uppercase, (const ZyanStringView*)ZYAN_NULL, suffix);
}
if (force_sign)
{
ZYAN_ASSERT(value >= 0);
ZYAN_CHECK(ZydisStringAppendShort(string, &str_add));
}
return ZydisStringAppendHexU(string, value, padding_length, force_leading_number, uppercase,
prefix, suffix);
}
/* ---------------------------------------------------------------------------------------------- */
/* ============================================================================================== */
#ifdef __cplusplus
}
#endif
#endif // ZYDIS_INTERNAL_STRING_H
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