[4] | 1 | /**
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| 2 | * @file memory.cpp
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| 3 | * @author myusgun@gmail.com
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| 4 | * @brief memory
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| 5 | */
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| 6 | #include "cf/memory.h"
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| 7 |
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| 8 | #include <stdio.h>
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| 9 | #include <stdlib.h>
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| 10 | #include <string.h>
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| 11 |
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| 12 | static const cf::uint8_t gVerifier[4] = {0xcf, '+', '+', 0x00};
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| 13 |
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| 14 | cf::memory::memory(const cf::size_t size)
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| 15 | throw (cf::exception)
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| 16 | : mMemory(NULL)
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| 17 | {
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| 18 | mMemory = cf::memory::alloc(size);
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| 19 | }
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| 20 |
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| 21 | cf::memory::~memory()
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| 22 | {
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| 23 | cf::memory::free(mMemory);
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| 24 | mMemory = NULL;
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| 25 | }
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| 26 |
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| 27 | cf::void_t * cf::memory::buffer()
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| 28 | {
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| 29 | return mMemory;
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| 30 | }
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| 31 |
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| 32 | cf::void_t * cf::memory::alloc(const cf::size_t size)
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| 33 | throw (cf::exception)
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| 34 | {
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| 35 | cf::uint8_t * mem = (cf::uint8_t *)::calloc(size + sizeof(gVerifier), 1);
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| 36 | if (!mem)
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| 37 | THROW_EXCEPTION("cannot allocate memory");
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| 38 |
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| 39 | ::memcpy(mem, gVerifier, sizeof(gVerifier));
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| 40 |
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| 41 | return reinterpret_cast<cf::void_t *>(mem + sizeof(gVerifier));
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| 42 | }
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| 43 |
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| 44 | cf::void_t cf::memory::free(cf::void_t * mem)
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| 45 | throw (cf::exception)
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| 46 | {
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| 47 | if (!valid(mem))
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| 48 | THROW_EXCEPTION("invalid address or verification code");
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| 49 |
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| 50 | cf::uint8_t * ptr = reinterpret_cast<cf::uint8_t *>(mem);
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| 51 |
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| 52 | ptr -= sizeof(gVerifier);
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| 53 |
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| 54 | ::memset(ptr, 0x00, sizeof(gVerifier));
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| 55 |
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| 56 | ::free(ptr);
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| 57 | }
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| 58 |
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| 59 | cf::bool_t cf::memory::valid(const cf::void_t * mem)
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| 60 | {
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| 61 | const cf::uint8_t * ptr = reinterpret_cast<const cf::uint8_t *>(mem);
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| 62 |
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| 63 | /* include checking NULL */
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| 64 | if (ptr < (cf::uint8_t *)sizeof(gVerifier))
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| 65 | return false;
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| 66 |
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| 67 | ptr -= sizeof(gVerifier);
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| 68 |
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| 69 | if (::memcmp(ptr, gVerifier, sizeof(gVerifier)))
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| 70 | return false;
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| 71 |
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| 72 | return true;
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| 73 | }
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