1 // ***************************************************************************
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2 // BGZF.h (c) 2009 Derek Barnett, Michael Str�mberg
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3 // Marth Lab, Department of Biology, Boston College
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4 // All rights reserved.
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5 // ---------------------------------------------------------------------------
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6 // Last modified: 9 July 2010 (DB)
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7 // ---------------------------------------------------------------------------
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8 // BGZF routines were adapted from the bgzf.c code developed at the Broad
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10 // ---------------------------------------------------------------------------
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11 // Provides the basic functionality for reading & writing BGZF files
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12 // ***************************************************************************
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28 // Platform-specific type definitions
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29 #ifndef BAMTOOLS_TYPES
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30 #define BAMTOOLS_TYPES
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32 typedef char int8_t;
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33 typedef unsigned char uint8_t;
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34 typedef short int16_t;
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35 typedef unsigned short uint16_t;
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36 typedef int int32_t;
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37 typedef unsigned int uint32_t;
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38 typedef long long int64_t;
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39 typedef unsigned long long uint64_t;
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43 #endif // BAMTOOLS_TYPES
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45 namespace BamTools {
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48 const int GZIP_ID1 = 31;
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49 const int GZIP_ID2 = 139;
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50 const int CM_DEFLATE = 8;
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51 const int FLG_FEXTRA = 4;
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52 const int OS_UNKNOWN = 255;
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53 const int BGZF_XLEN = 6;
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54 const int BGZF_ID1 = 66;
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55 const int BGZF_ID2 = 67;
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56 const int BGZF_LEN = 2;
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57 const int GZIP_WINDOW_BITS = -15;
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58 const int Z_DEFAULT_MEM_LEVEL = 8;
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61 const int BLOCK_HEADER_LENGTH = 18;
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62 const int BLOCK_FOOTER_LENGTH = 8;
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63 const int MAX_BLOCK_SIZE = 65536;
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64 const int DEFAULT_BLOCK_SIZE = 65536;
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68 // ---------------------------------
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71 unsigned int UncompressedBlockSize;
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72 unsigned int CompressedBlockSize;
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73 unsigned int BlockLength;
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74 unsigned int BlockOffset;
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75 uint64_t BlockAddress;
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79 char* UncompressedBlock;
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80 char* CompressedBlock;
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82 // ---------------------------------
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83 // constructor & destructor
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88 // ---------------------------------
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89 // main interface methods
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93 // opens the BGZF file (mode is either "rb" for reading, or "wb" for writing)
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94 bool Open(const std::string& filename, const char* mode);
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95 // reads BGZF data into a byte buffer
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96 int Read(char* data, const unsigned int dataLength);
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97 // seek to position in BGZF file
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98 bool Seek(int64_t position);
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99 // get file position in BGZF file
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100 int64_t Tell(void);
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101 // writes the supplied data into the BGZF buffer
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102 unsigned int Write(const char* data, const unsigned int dataLen);
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104 // ---------------------------------
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105 // internal methods
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107 // compresses the current block
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108 int DeflateBlock(void);
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109 // flushes the data in the BGZF block
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110 void FlushBlock(void);
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111 // de-compresses the current block
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112 int InflateBlock(const int& blockLength);
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113 // reads a BGZF block
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114 bool ReadBlock(void);
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116 // ---------------------------------
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117 // static 'utility' methods
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119 // checks BGZF block header
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120 static inline bool CheckBlockHeader(char* header);
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121 // packs an unsigned integer into the specified buffer
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122 static inline void PackUnsignedInt(char* buffer, unsigned int value);
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123 // packs an unsigned short into the specified buffer
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124 static inline void PackUnsignedShort(char* buffer, unsigned short value);
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125 // unpacks a buffer into a double
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126 static inline double UnpackDouble(char* buffer);
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127 static inline double UnpackDouble(const char* buffer);
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128 // unpacks a buffer into a float
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129 static inline float UnpackFloat(char* buffer);
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130 static inline float UnpackFloat(const char* buffer);
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131 // unpacks a buffer into a signed int
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132 static inline signed int UnpackSignedInt(char* buffer);
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133 static inline signed int UnpackSignedInt(const char* buffer);
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134 // unpacks a buffer into a signed short
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135 static inline signed short UnpackSignedShort(char* buffer);
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136 static inline signed short UnpackSignedShort(const char* buffer);
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137 // unpacks a buffer into an unsigned int
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138 static inline unsigned int UnpackUnsignedInt(char* buffer);
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139 static inline unsigned int UnpackUnsignedInt(const char* buffer);
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140 // unpacks a buffer into an unsigned short
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141 static inline unsigned short UnpackUnsignedShort(char* buffer);
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142 static inline unsigned short UnpackUnsignedShort(const char* buffer);
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145 // -------------------------------------------------------------
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146 // static 'utility' method implementations
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148 // checks BGZF block header
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150 bool BgzfData::CheckBlockHeader(char* header) {
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151 return (header[0] == GZIP_ID1 &&
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152 header[1] == (char)GZIP_ID2 &&
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153 header[2] == Z_DEFLATED &&
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154 (header[3] & FLG_FEXTRA) != 0 &&
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155 BgzfData::UnpackUnsignedShort(&header[10]) == BGZF_XLEN &&
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156 header[12] == BGZF_ID1 &&
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157 header[13] == BGZF_ID2 &&
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158 BgzfData::UnpackUnsignedShort(&header[14]) == BGZF_LEN );
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161 // 'packs' an unsigned integer into the specified buffer
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163 void BgzfData::PackUnsignedInt(char* buffer, unsigned int value) {
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164 buffer[0] = (char)value;
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165 buffer[1] = (char)(value >> 8);
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166 buffer[2] = (char)(value >> 16);
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167 buffer[3] = (char)(value >> 24);
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170 // 'packs' an unsigned short into the specified buffer
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172 void BgzfData::PackUnsignedShort(char* buffer, unsigned short value) {
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173 buffer[0] = (char)value;
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174 buffer[1] = (char)(value >> 8);
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177 // 'unpacks' a buffer into a double (includes both non-const & const char* flavors)
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179 double BgzfData::UnpackDouble(char* buffer) {
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180 union { double value; unsigned char valueBuffer[sizeof(double)]; } un;
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182 un.valueBuffer[0] = buffer[0];
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183 un.valueBuffer[1] = buffer[1];
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184 un.valueBuffer[2] = buffer[2];
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185 un.valueBuffer[3] = buffer[3];
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186 un.valueBuffer[4] = buffer[4];
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187 un.valueBuffer[5] = buffer[5];
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188 un.valueBuffer[6] = buffer[6];
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189 un.valueBuffer[7] = buffer[7];
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194 double BgzfData::UnpackDouble(const char* buffer) {
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195 union { double value; unsigned char valueBuffer[sizeof(double)]; } un;
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197 un.valueBuffer[0] = buffer[0];
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198 un.valueBuffer[1] = buffer[1];
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199 un.valueBuffer[2] = buffer[2];
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200 un.valueBuffer[3] = buffer[3];
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201 un.valueBuffer[4] = buffer[4];
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202 un.valueBuffer[5] = buffer[5];
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203 un.valueBuffer[6] = buffer[6];
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204 un.valueBuffer[7] = buffer[7];
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208 // 'unpacks' a buffer into a float (includes both non-const & const char* flavors)
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210 float BgzfData::UnpackFloat(char* buffer) {
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211 union { float value; unsigned char valueBuffer[sizeof(float)]; } un;
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213 un.valueBuffer[0] = buffer[0];
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214 un.valueBuffer[1] = buffer[1];
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215 un.valueBuffer[2] = buffer[2];
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216 un.valueBuffer[3] = buffer[3];
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221 float BgzfData::UnpackFloat(const char* buffer) {
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222 union { float value; unsigned char valueBuffer[sizeof(float)]; } un;
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224 un.valueBuffer[0] = buffer[0];
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225 un.valueBuffer[1] = buffer[1];
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226 un.valueBuffer[2] = buffer[2];
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227 un.valueBuffer[3] = buffer[3];
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231 // 'unpacks' a buffer into a signed int (includes both non-const & const char* flavors)
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233 signed int BgzfData::UnpackSignedInt(char* buffer) {
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234 union { signed int value; unsigned char valueBuffer[sizeof(signed int)]; } un;
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236 un.valueBuffer[0] = buffer[0];
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237 un.valueBuffer[1] = buffer[1];
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238 un.valueBuffer[2] = buffer[2];
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239 un.valueBuffer[3] = buffer[3];
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244 signed int BgzfData::UnpackSignedInt(const char* buffer) {
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245 union { signed int value; unsigned char valueBuffer[sizeof(signed int)]; } un;
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247 un.valueBuffer[0] = buffer[0];
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248 un.valueBuffer[1] = buffer[1];
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249 un.valueBuffer[2] = buffer[2];
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250 un.valueBuffer[3] = buffer[3];
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254 // 'unpacks' a buffer into a signed short (includes both non-const & const char* flavors)
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256 signed short BgzfData::UnpackSignedShort(char* buffer) {
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257 union { signed short value; unsigned char valueBuffer[sizeof(signed short)]; } un;
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259 un.valueBuffer[0] = buffer[0];
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260 un.valueBuffer[1] = buffer[1];
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265 signed short BgzfData::UnpackSignedShort(const char* buffer) {
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266 union { signed short value; unsigned char valueBuffer[sizeof(signed short)]; } un;
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268 un.valueBuffer[0] = buffer[0];
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269 un.valueBuffer[1] = buffer[1];
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273 // 'unpacks' a buffer into an unsigned int (includes both non-const & const char* flavors)
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275 unsigned int BgzfData::UnpackUnsignedInt(char* buffer) {
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276 union { unsigned int value; unsigned char valueBuffer[sizeof(unsigned int)]; } un;
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278 un.valueBuffer[0] = buffer[0];
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279 un.valueBuffer[1] = buffer[1];
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280 un.valueBuffer[2] = buffer[2];
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281 un.valueBuffer[3] = buffer[3];
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286 unsigned int BgzfData::UnpackUnsignedInt(const char* buffer) {
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287 union { unsigned int value; unsigned char valueBuffer[sizeof(unsigned int)]; } un;
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289 un.valueBuffer[0] = buffer[0];
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290 un.valueBuffer[1] = buffer[1];
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291 un.valueBuffer[2] = buffer[2];
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292 un.valueBuffer[3] = buffer[3];
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296 // 'unpacks' a buffer into an unsigned short (includes both non-const & const char* flavors)
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298 unsigned short BgzfData::UnpackUnsignedShort(char* buffer) {
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299 union { unsigned short value; unsigned char valueBuffer[sizeof(unsigned short)]; } un;
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301 un.valueBuffer[0] = buffer[0];
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302 un.valueBuffer[1] = buffer[1];
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307 unsigned short BgzfData::UnpackUnsignedShort(const char* buffer) {
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308 union { unsigned short value; unsigned char valueBuffer[sizeof(unsigned short)]; } un;
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310 un.valueBuffer[0] = buffer[0];
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311 un.valueBuffer[1] = buffer[1];
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315 } // namespace BamTools
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