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1 // Archive/GZipIn.cpp
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2
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3 #include "StdAfx.h"
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4
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5 #include "GZipIn.h"
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6
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7 #include "Common/Defs.h"
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8 #include "Common/MyCom.h"
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9 #include "Windows/Defs.h"
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10
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11 #include "../../Common/StreamUtils.h"
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12
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13 extern "C"
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14 {
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15 #include "../../../../C/7zCrc.h"
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16 }
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17
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18 namespace NArchive {
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19 namespace NGZip {
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20
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21 HRESULT CInArchive::ReadBytes(ISequentialInStream *inStream, void *data, UInt32 size)
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22 {
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23 RINOK(ReadStream_FALSE(inStream, data, size));
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24 m_Position += size;
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25 return S_OK;
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26 }
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27
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28 HRESULT CInArchive::ReadByte(ISequentialInStream *inStream, Byte &value, UInt32 &crc)
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29 {
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30 RINOK(ReadBytes(inStream, &value, 1));
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31 crc = CRC_UPDATE_BYTE(crc, value);
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32 return S_OK;
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33 }
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34
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35 HRESULT CInArchive::ReadUInt16(ISequentialInStream *inStream, UInt16 &value, UInt32 &crc)
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36 {
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37 value = 0;
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38 for (int i = 0; i < 2; i++)
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39 {
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40 Byte b;
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41 RINOK(ReadByte(inStream, b, crc));
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42 value |= (UInt16(b) << (8 * i));
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43 }
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44 return S_OK;
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45 }
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46
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47 HRESULT CInArchive::ReadUInt32(ISequentialInStream *inStream, UInt32 &value, UInt32 &crc)
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48 {
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49 value = 0;
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50 for (int i = 0; i < 4; i++)
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51 {
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52 Byte b;
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53 RINOK(ReadByte(inStream, b, crc));
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54 value |= (UInt32(b) << (8 * i));
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55 }
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56 return S_OK;
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57 }
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58
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59 HRESULT CInArchive::ReadZeroTerminatedString(ISequentialInStream *inStream, AString &resString, UInt32 &crc)
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60 {
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61 resString.Empty();
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62 for (;;)
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63 {
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64 Byte c;
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65 RINOK(ReadByte(inStream, c, crc));
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66 if (c == 0)
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67 return S_OK;
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68 resString += char(c);
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69 }
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70 }
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71
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72 HRESULT CInArchive::ReadHeader(ISequentialInStream *inStream, CItem &item)
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73 {
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74 item.Clear();
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75 m_Position = 0;
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76
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77 UInt16 signature;
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78 UInt32 crc = CRC_INIT_VAL;;
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79 RINOK(ReadUInt16(inStream, signature, crc));
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80 if (signature != kSignature)
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81 return S_FALSE;
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82
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83 RINOK(ReadByte(inStream, item.CompressionMethod, crc));
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84 RINOK(ReadByte(inStream, item.Flags, crc));
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85 RINOK(ReadUInt32(inStream, item.Time, crc));
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86 RINOK(ReadByte(inStream, item.ExtraFlags, crc));
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87 RINOK(ReadByte(inStream, item.HostOS, crc));
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88
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89 if (item.ExtraFieldIsPresent())
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90 {
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91 UInt16 extraSize;
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92 RINOK(ReadUInt16(inStream, extraSize, crc));
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93 item.Extra.SetCapacity(extraSize);
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94 RINOK(ReadBytes(inStream, item.Extra, extraSize));
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95 crc = CrcUpdate(crc, item.Extra, extraSize);
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96 }
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97 if (item.NameIsPresent())
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98 RINOK(ReadZeroTerminatedString(inStream, item.Name, crc));
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99 if (item.CommentIsPresent())
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100 RINOK(ReadZeroTerminatedString(inStream, item.Comment, crc));
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101 if (item.HeaderCRCIsPresent())
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102 {
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103 UInt16 headerCRC;
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104 UInt32 dummy = 0;
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105 RINOK(ReadUInt16(inStream, headerCRC, dummy));
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106 if ((UInt16)CRC_GET_DIGEST(crc) != headerCRC)
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107 return S_FALSE;
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108 }
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109 return S_OK;
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110 }
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111
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112 HRESULT CInArchive::ReadPostHeader(ISequentialInStream *inStream, CItem &item)
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113 {
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114 UInt32 dummy = 0;
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115 RINOK(ReadUInt32(inStream, item.FileCRC, dummy));
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116 return ReadUInt32(inStream, item.UnPackSize32, dummy);
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117 }
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118
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119 }}
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