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65 lines
2.2 KiB
65 lines
2.2 KiB
/* |
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* Copyright (C) 2008 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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/* |
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* Functions for interpreting LEB128 (little endian base 128) values |
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*/ |
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#include "Leb128.h" |
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/* |
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* Reads an unsigned LEB128 value, updating the given pointer to point |
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* just past the end of the read value and also indicating whether the |
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* value was syntactically valid. The only syntactically *invalid* |
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* values are ones that are five bytes long where the final byte has |
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* any but the low-order four bits set. Additionally, if the limit is |
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* passed as non-NULL and bytes would need to be read past the limit, |
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* then the read is considered invalid. |
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*/ |
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int readAndVerifyUnsignedLeb128(const u1** pStream, const u1* limit, |
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bool* okay) { |
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const u1* ptr = *pStream; |
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int result = readUnsignedLeb128(pStream); |
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if (((limit != NULL) && (*pStream > limit)) |
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|| (((*pStream - ptr) == 5) && (ptr[4] > 0x0f))) { |
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*okay = false; |
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} |
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return result; |
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} |
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/* |
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* Reads a signed LEB128 value, updating the given pointer to point |
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* just past the end of the read value and also indicating whether the |
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* value was syntactically valid. The only syntactically *invalid* |
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* values are ones that are five bytes long where the final byte has |
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* any but the low-order four bits set. Additionally, if the limit is |
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* passed as non-NULL and bytes would need to be read past the limit, |
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* then the read is considered invalid. |
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*/ |
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int readAndVerifySignedLeb128(const u1** pStream, const u1* limit, |
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bool* okay) { |
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const u1* ptr = *pStream; |
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int result = readSignedLeb128(pStream); |
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if (((limit != NULL) && (*pStream > limit)) |
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|| (((*pStream - ptr) == 5) && (ptr[4] > 0x0f))) { |
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*okay = false; |
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} |
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return result; |
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}
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