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// © 2017 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
// bytesinkutil.cpp
// created: 2017sep14 Markus W. Scherer
#include "unicode/utypes.h"
#include "unicode/bytestream.h"
#include "unicode/edits.h"
#include "unicode/stringoptions.h"
#include "unicode/utf8.h"
#include "unicode/utf16.h"
#include "bytesinkutil.h"
#include "charstr.h"
#include "cmemory.h"
#include "uassert.h"
U_NAMESPACE_BEGIN
UBool
ByteSinkUtil::appendChange(int32_t length, const char16_t *s16, int32_t s16Length,
ByteSink &sink, Edits *edits, UErrorCode &errorCode) {
if (U_FAILURE(errorCode)) { return false; }
char scratch[200];
int32_t s8Length = 0;
for (int32_t i = 0; i < s16Length;) {
int32_t capacity;
int32_t desiredCapacity = s16Length - i;
if (desiredCapacity < (INT32_MAX / 3)) {
desiredCapacity *= 3; // max 3 UTF-8 bytes per UTF-16 code unit
} else if (desiredCapacity < (INT32_MAX / 2)) {
desiredCapacity *= 2;
} else {
desiredCapacity = INT32_MAX;
}
char *buffer = sink.GetAppendBuffer(U8_MAX_LENGTH, desiredCapacity,
scratch, UPRV_LENGTHOF(scratch), &capacity);
capacity -= U8_MAX_LENGTH - 1;
int32_t j = 0;
for (; i < s16Length && j < capacity;) {
UChar32 c;
U16_NEXT_UNSAFE(s16, i, c);
U8_APPEND_UNSAFE(buffer, j, c);
}
if (j > (INT32_MAX - s8Length)) {
errorCode = U_INDEX_OUTOFBOUNDS_ERROR;
return false;
}
sink.Append(buffer, j);
s8Length += j;
}
if (edits != nullptr) {
edits->addReplace(length, s8Length);
}
return true;
}
UBool
ByteSinkUtil::appendChange(const uint8_t *s, const uint8_t *limit,
const char16_t *s16, int32_t s16Length,
ByteSink &sink, Edits *edits, UErrorCode &errorCode) {
if (U_FAILURE(errorCode)) { return false; }
if ((limit - s) > INT32_MAX) {
errorCode = U_INDEX_OUTOFBOUNDS_ERROR;
return false;
}
return appendChange((int32_t)(limit - s), s16, s16Length, sink, edits, errorCode);
}
void
ByteSinkUtil::appendCodePoint(int32_t length, UChar32 c, ByteSink &sink, Edits *edits) {
char s8[U8_MAX_LENGTH];
int32_t s8Length = 0;
U8_APPEND_UNSAFE(s8, s8Length, c);
if (edits != nullptr) {
edits->addReplace(length, s8Length);
}
sink.Append(s8, s8Length);
}
namespace {
// See unicode/utf8.h U8_APPEND_UNSAFE().
inline uint8_t getTwoByteLead(UChar32 c) { return (uint8_t)((c >> 6) | 0xc0); }
inline uint8_t getTwoByteTrail(UChar32 c) { return (uint8_t)((c & 0x3f) | 0x80); }
} // namespace
void
ByteSinkUtil::appendTwoBytes(UChar32 c, ByteSink &sink) {
U_ASSERT(0x80 <= c && c <= 0x7ff); // 2-byte UTF-8
char s8[2] = { (char)getTwoByteLead(c), (char)getTwoByteTrail(c) };
sink.Append(s8, 2);
}
void
ByteSinkUtil::appendNonEmptyUnchanged(const uint8_t *s, int32_t length,
ByteSink &sink, uint32_t options, Edits *edits) {
U_ASSERT(length > 0);
if (edits != nullptr) {
edits->addUnchanged(length);
}
if ((options & U_OMIT_UNCHANGED_TEXT) == 0) {
sink.Append(reinterpret_cast<const char *>(s), length);
}
}
UBool
ByteSinkUtil::appendUnchanged(const uint8_t *s, const uint8_t *limit,
ByteSink &sink, uint32_t options, Edits *edits,
UErrorCode &errorCode) {
if (U_FAILURE(errorCode)) { return false; }
if ((limit - s) > INT32_MAX) {
errorCode = U_INDEX_OUTOFBOUNDS_ERROR;
return false;
}
int32_t length = (int32_t)(limit - s);
if (length > 0) {
appendNonEmptyUnchanged(s, length, sink, options, edits);
}
return true;
}
CharStringByteSink::CharStringByteSink(CharString* dest) : dest_(*dest) {
}
CharStringByteSink::~CharStringByteSink() = default;
void
CharStringByteSink::Append(const char* bytes, int32_t n) {
UErrorCode status = U_ZERO_ERROR;
dest_.append(bytes, n, status);
// Any errors are silently ignored.
}
char*
CharStringByteSink::GetAppendBuffer(int32_t min_capacity,
int32_t desired_capacity_hint,
char* scratch,
int32_t scratch_capacity,
int32_t* result_capacity) {
if (min_capacity < 1 || scratch_capacity < min_capacity) {
*result_capacity = 0;
return nullptr;
}
UErrorCode status = U_ZERO_ERROR;
char* result = dest_.getAppendBuffer(
min_capacity,
desired_capacity_hint,
*result_capacity,
status);
if (U_SUCCESS(status)) {
return result;
}
*result_capacity = scratch_capacity;
return scratch;
}
U_NAMESPACE_END
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