--- /dev/null
+/*
+ LZ4 - Fast LZ compression algorithm
+ Copyright (C) 2011-2013, Yann Collet.
+ BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are
+ met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following disclaimer
+ in the documentation and/or other materials provided with the
+ distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ You can contact the author at :
+ - LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
+ - LZ4 source repository : http://code.google.com/p/lz4/
+*/
+
+#include "config.h"
+
+/*
+Note : this source file requires "lz4_encoder.h"
+*/
+
+//**************************************
+// Tuning parameters
+//**************************************
+// MEMORY_USAGE :
+// Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
+// Increasing memory usage improves compression ratio
+// Reduced memory usage can improve speed, due to cache effect
+// Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache
+#define MEMORY_USAGE 14
+
+// HEAPMODE :
+// Select how default compression function will allocate memory for its hash table,
+// in memory stack (0:default, fastest), or in memory heap (1:requires memory allocation (malloc)).
+// Default allocation strategy is to use stack (HEAPMODE 0)
+// Note : explicit functions *_stack* and *_heap* are unaffected by this setting
+#define HEAPMODE 0
+
+// BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE :
+// This will provide a small boost to performance for big endian cpu, but the resulting compressed stream will be incompatible with little-endian CPU.
+// You can set this option to 1 in situations where data will remain within closed environment
+// This option is useless on Little_Endian CPU (such as x86)
+//#define BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE 1
+
+#ifdef HAVE_BIG_ENDIAN
+#define LZ4_BIG_ENDIAN 1
+#else
+#if defined(__sparc) || defined(__sparc__) \
+ || defined(__powerpc__) || defined(__ppc__) || defined(__PPC__) \
+ || defined(__hpux) || defined(__hppa) \
+ || defined(_MIPSEB) || defined(__s390__)
+#error "BIG Endian detected but not set"
+#endif
+#endif
+
+//**************************************
+// CPU Feature Detection
+//**************************************
+// 32 or 64 bits ?
+#if (defined(__x86_64__) || defined(_M_X64) || defined(_WIN64) \
+ || defined(__powerpc64__) || defined(__ppc64__) || defined(__PPC64__) \
+ || defined(__64BIT__) || defined(_LP64) || defined(__LP64__) \
+ || defined(__ia64) || defined(__itanium__) || defined(_M_IA64) ) // Detects 64 bits mode
+# define LZ4_ARCH64 1
+#else
+# define LZ4_ARCH64 0
+#endif
+
+
+// Unaligned memory access is automatically enabled for "common" CPU, such as x86.
+// For others CPU, the compiler will be more cautious, and insert extra code to ensure aligned access is respected
+// If you know your target CPU supports unaligned memory access, you want to force this option manually to improve performance
+#if defined(__ARM_FEATURE_UNALIGNED)
+# define LZ4_FORCE_UNALIGNED_ACCESS 1
+#endif
+
+// Define this parameter if your target system or compiler does not support hardware bit count
+#if defined(_MSC_VER) && defined(_WIN32_WCE) // Visual Studio for Windows CE does not support Hardware bit count
+# define LZ4_FORCE_SW_BITCOUNT
+#endif
+
+
+//**************************************
+// Compiler Options
+//**************************************
+#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L // C99
+/* "restrict" is a known keyword */
+#elif !defined restrict
+# define restrict // Disable restrict
+#endif
+
+
+#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
+
+#ifdef _MSC_VER // Visual Studio
+# include <intrin.h> // For Visual 2005
+# if LZ4_ARCH64 // 64-bit
+# pragma intrinsic(_BitScanForward64) // For Visual 2005
+# pragma intrinsic(_BitScanReverse64) // For Visual 2005
+# else
+# pragma intrinsic(_BitScanForward) // For Visual 2005
+# pragma intrinsic(_BitScanReverse) // For Visual 2005
+# endif
+# pragma warning(disable : 4127) // disable: C4127: conditional expression is constant
+#endif
+
+#ifdef _MSC_VER
+# define lz4_bswap16(x) _byteswap_ushort(x)
+#else
+# define lz4_bswap16(x) ((unsigned short int) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)))
+#endif
+
+#if (GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__)
+# define expect(expr,value) (__builtin_expect ((expr),(value)) )
+#else
+# define expect(expr,value) (expr)
+#endif
+
+#define likely(expr) expect((expr) != 0, 1)
+#define unlikely(expr) expect((expr) != 0, 0)
+
+
+//**************************************
+// Includes
+//**************************************
+#include <stdlib.h> // for malloc
+#include <string.h> // for memset
+#include "lz4.h"
+
+
+//**************************************
+// Basic Types
+//**************************************
+#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L // C99
+# include <stdint.h>
+ typedef uint8_t BYTE;
+ typedef uint16_t U16;
+ typedef uint32_t U32;
+ typedef int32_t S32;
+ typedef uint64_t U64;
+#else
+ typedef unsigned char BYTE;
+ typedef unsigned short U16;
+ typedef unsigned int U32;
+ typedef signed int S32;
+ typedef unsigned long long U64;
+#endif
+
+#if defined(__GNUC__) && !defined(LZ4_FORCE_UNALIGNED_ACCESS)
+# define _PACKED __attribute__ ((packed))
+#else
+# define _PACKED
+#endif
+
+#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__)
+# pragma pack(push, 1)
+#endif
+
+typedef struct _U16_S { U16 v; } _PACKED U16_S;
+typedef struct _U32_S { U32 v; } _PACKED U32_S;
+typedef struct _U64_S { U64 v; } _PACKED U64_S;
+
+#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__)
+# pragma pack(pop)
+#endif
+
+#define A64(x) (((U64_S *)(x))->v)
+#define A32(x) (((U32_S *)(x))->v)
+#define A16(x) (((U16_S *)(x))->v)
+
+
+//**************************************
+// Constants
+//**************************************
+#define HASHTABLESIZE (1 << MEMORY_USAGE)
+
+#define MINMATCH 4
+
+#define COPYLENGTH 8
+#define LASTLITERALS 5
+#define MFLIMIT (COPYLENGTH+MINMATCH)
+#define MINLENGTH (MFLIMIT+1)
+
+#define LZ4_64KLIMIT ((1<<16) + (MFLIMIT-1))
+#define SKIPSTRENGTH 6 // Increasing this value will make the compression run slower on incompressible data
+
+#define MAXD_LOG 16
+#define MAX_DISTANCE ((1 << MAXD_LOG) - 1)
+
+#define ML_BITS 4
+#define ML_MASK ((1U<<ML_BITS)-1)
+#define RUN_BITS (8-ML_BITS)
+#define RUN_MASK ((1U<<RUN_BITS)-1)
+
+
+//**************************************
+// Architecture-specific macros
+//**************************************
+#if LZ4_ARCH64 // 64-bit
+# define STEPSIZE 8
+# define UARCH U64
+# define AARCH A64
+# define LZ4_COPYSTEP(s,d) A64(d) = A64(s); d+=8; s+=8;
+# define LZ4_COPYPACKET(s,d) LZ4_COPYSTEP(s,d)
+# define LZ4_SECURECOPY(s,d,e) if (d<e) LZ4_WILDCOPY(s,d,e)
+# define HTYPE U32
+# define INITBASE(base) const BYTE* const base = ip
+#else // 32-bit
+# define STEPSIZE 4
+# define UARCH U32
+# define AARCH A32
+# define LZ4_COPYSTEP(s,d) A32(d) = A32(s); d+=4; s+=4;
+# define LZ4_COPYPACKET(s,d) LZ4_COPYSTEP(s,d); LZ4_COPYSTEP(s,d);
+# define LZ4_SECURECOPY LZ4_WILDCOPY
+# define HTYPE const BYTE*
+# define INITBASE(base) const int base = 0
+#endif
+
+#if (defined(LZ4_BIG_ENDIAN) && !defined(BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE))
+# define LZ4_READ_LITTLEENDIAN_16(d,s,p) { U16 v = A16(p); v = lz4_bswap16(v); d = (s) - v; }
+# define LZ4_WRITE_LITTLEENDIAN_16(p,i) { U16 v = (U16)(i); v = lz4_bswap16(v); A16(p) = v; p+=2; }
+#else // Little Endian
+# define LZ4_READ_LITTLEENDIAN_16(d,s,p) { d = (s) - A16(p); }
+# define LZ4_WRITE_LITTLEENDIAN_16(p,v) { A16(p) = v; p+=2; }
+#endif
+
+
+//**************************************
+// Macros
+//**************************************
+#define LZ4_WILDCOPY(s,d,e) do { LZ4_COPYPACKET(s,d) } while (d<e);
+#define LZ4_BLINDCOPY(s,d,l) { BYTE* e=(d)+(l); LZ4_WILDCOPY(s,d,e); d=e; }
+
+
+//****************************
+// Private functions
+//****************************
+#if LZ4_ARCH64
+
+static inline int LZ4_NbCommonBytes (register U64 val)
+{
+#if defined(LZ4_BIG_ENDIAN)
+ #if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ unsigned long r = 0;
+ _BitScanReverse64( &r, val );
+ return (int)(r>>3);
+ #elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ return (__builtin_clzll(val) >> 3);
+ #else
+ int r;
+ if (!(val>>32)) { r=4; } else { r=0; val>>=32; }
+ if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; }
+ r += (!val);
+ return r;
+ #endif
+#else
+ #if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ unsigned long r = 0;
+ _BitScanForward64( &r, val );
+ return (int)(r>>3);
+ #elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ return (__builtin_ctzll(val) >> 3);
+ #else
+ static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2, 0, 3, 1, 3, 1, 4, 2, 7, 0, 2, 3, 6, 1, 5, 3, 5, 1, 3, 4, 4, 2, 5, 6, 7, 7, 0, 1, 2, 3, 3, 4, 6, 2, 6, 5, 5, 3, 4, 5, 6, 7, 1, 2, 4, 6, 4, 4, 5, 7, 2, 6, 5, 7, 6, 7, 7 };
+ return DeBruijnBytePos[((U64)((val & -val) * 0x0218A392CDABBD3F)) >> 58];
+ #endif
+#endif
+}
+
+#else
+
+static inline int LZ4_NbCommonBytes (register U32 val)
+{
+#if defined(LZ4_BIG_ENDIAN)
+# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ unsigned long r = 0;
+ _BitScanReverse( &r, val );
+ return (int)(r>>3);
+# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ return (__builtin_clz(val) >> 3);
+# else
+ int r;
+ if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
+ r += (!val);
+ return r;
+# endif
+#else
+# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ unsigned long r;
+ _BitScanForward( &r, val );
+ return (int)(r>>3);
+# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ return (__builtin_ctz(val) >> 3);
+# else
+ static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 1, 3, 2, 0, 1, 3, 3, 1, 2, 2, 2, 2, 0, 3, 1, 2, 0, 1, 0, 1, 1 };
+ return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27];
+# endif
+#endif
+}
+
+#endif
+
+
+
+//******************************
+// Compression functions
+//******************************
+
+/*
+int LZ4_compress_stack(
+ const char* source,
+ char* dest,
+ int inputSize)
+
+Compress 'inputSize' bytes from 'source' into an output buffer 'dest'.
+Destination buffer must be already allocated, and sized at a minimum of LZ4_compressBound(inputSize).
+return : the number of bytes written in buffer 'dest'
+*/
+#define FUNCTION_NAME LZ4_compress_stack
+#include "lz4_encoder.h"
+
+
+/*
+int LZ4_compress_stack_limitedOutput(
+ const char* source,
+ char* dest,
+ int inputSize,
+ int maxOutputSize)
+
+Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
+If it cannot achieve it, compression will stop, and result of the function will be zero.
+return : the number of bytes written in buffer 'dest', or 0 if the compression fails
+*/
+#define FUNCTION_NAME LZ4_compress_stack_limitedOutput
+#define LIMITED_OUTPUT
+#include "lz4_encoder.h"
+
+
+/*
+int LZ4_compress64k_stack(
+ const char* source,
+ char* dest,
+ int inputSize)
+
+Compress 'inputSize' bytes from 'source' into an output buffer 'dest'.
+This function compresses better than LZ4_compress_stack(), on the condition that
+'inputSize' must be < to LZ4_64KLIMIT, or the function will fail.
+Destination buffer must be already allocated, and sized at a minimum of LZ4_compressBound(inputSize).
+return : the number of bytes written in buffer 'dest', or 0 if compression fails
+*/
+#define FUNCTION_NAME LZ4_compress64k_stack
+#define COMPRESS_64K
+#include "lz4_encoder.h"
+
+
+/*
+int LZ4_compress64k_stack_limitedOutput(
+ const char* source,
+ char* dest,
+ int inputSize,
+ int maxOutputSize)
+
+Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
+This function compresses better than LZ4_compress_stack_limitedOutput(), on the condition that
+'inputSize' must be < to LZ4_64KLIMIT, or the function will fail.
+If it cannot achieve it, compression will stop, and result of the function will be zero.
+return : the number of bytes written in buffer 'dest', or 0 if the compression fails
+*/
+#define FUNCTION_NAME LZ4_compress64k_stack_limitedOutput
+#define COMPRESS_64K
+#define LIMITED_OUTPUT
+#include "lz4_encoder.h"
+
+
+/*
+void* LZ4_createHeapMemory();
+int LZ4_freeHeapMemory(void* ctx);
+
+Used to allocate and free hashTable memory
+to be used by the LZ4_compress_heap* family of functions.
+LZ4_createHeapMemory() returns NULL is memory allocation fails.
+*/
+void* LZ4_create() { return malloc(HASHTABLESIZE); }
+int LZ4_free(void* ctx) { free(ctx); return 0; }
+
+
+/*
+int LZ4_compress_heap(
+ void* ctx,
+ const char* source,
+ char* dest,
+ int inputSize)
+
+Compress 'inputSize' bytes from 'source' into an output buffer 'dest'.
+The memory used for compression must be created by LZ4_createHeapMemory() and provided by pointer 'ctx'.
+Destination buffer must be already allocated, and sized at a minimum of LZ4_compressBound(inputSize).
+return : the number of bytes written in buffer 'dest'
+*/
+#define FUNCTION_NAME LZ4_compress_heap
+#define USE_HEAPMEMORY
+#include "lz4_encoder.h"
+
+
+/*
+int LZ4_compress_heap_limitedOutput(
+ void* ctx,
+ const char* source,
+ char* dest,
+ int inputSize,
+ int maxOutputSize)
+
+Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
+If it cannot achieve it, compression will stop, and result of the function will be zero.
+The memory used for compression must be created by LZ4_createHeapMemory() and provided by pointer 'ctx'.
+return : the number of bytes written in buffer 'dest', or 0 if the compression fails
+*/
+#define FUNCTION_NAME LZ4_compress_heap_limitedOutput
+#define LIMITED_OUTPUT
+#define USE_HEAPMEMORY
+#include "lz4_encoder.h"
+
+
+/*
+int LZ4_compress64k_heap(
+ void* ctx,
+ const char* source,
+ char* dest,
+ int inputSize)
+
+Compress 'inputSize' bytes from 'source' into an output buffer 'dest'.
+The memory used for compression must be created by LZ4_createHeapMemory() and provided by pointer 'ctx'.
+'inputSize' must be < to LZ4_64KLIMIT, or the function will fail.
+Destination buffer must be already allocated, and sized at a minimum of LZ4_compressBound(inputSize).
+return : the number of bytes written in buffer 'dest'
+*/
+#define FUNCTION_NAME LZ4_compress64k_heap
+#define COMPRESS_64K
+#define USE_HEAPMEMORY
+#include "lz4_encoder.h"
+
+
+/*
+int LZ4_compress64k_heap_limitedOutput(
+ void* ctx,
+ const char* source,
+ char* dest,
+ int inputSize,
+ int maxOutputSize)
+
+Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
+If it cannot achieve it, compression will stop, and result of the function will be zero.
+The memory used for compression must be created by LZ4_createHeapMemory() and provided by pointer 'ctx'.
+'inputSize' must be < to LZ4_64KLIMIT, or the function will fail.
+return : the number of bytes written in buffer 'dest', or 0 if the compression fails
+*/
+#define FUNCTION_NAME LZ4_compress64k_heap_limitedOutput
+#define COMPRESS_64K
+#define LIMITED_OUTPUT
+#define USE_HEAPMEMORY
+#include "lz4_encoder.h"
+
+
+int LZ4_compress(const char* source, char* dest, int inputSize)
+{
+#if HEAPMODE
+ void* ctx = LZ4_create();
+ int result;
+ if (ctx == NULL) return 0; // Failed allocation => compression not done
+ if (inputSize < LZ4_64KLIMIT)
+ result = LZ4_compress64k_heap(ctx, source, dest, inputSize);
+ else result = LZ4_compress_heap(ctx, source, dest, inputSize);
+ LZ4_free(ctx);
+ return result;
+#else
+ if (inputSize < (int)LZ4_64KLIMIT) return LZ4_compress64k_stack(source, dest, inputSize);
+ return LZ4_compress_stack(source, dest, inputSize);
+#endif
+}
+
+
+int LZ4_compress_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize)
+{
+#if HEAPMODE
+ void* ctx = LZ4_create();
+ int result;
+ if (ctx == NULL) return 0; // Failed allocation => compression not done
+ if (inputSize < LZ4_64KLIMIT)
+ result = LZ4_compress64k_heap_limitedOutput(ctx, source, dest, inputSize, maxOutputSize);
+ else result = LZ4_compress_heap_limitedOutput(ctx, source, dest, inputSize, maxOutputSize);
+ LZ4_free(ctx);
+ return result;
+#else
+ if (inputSize < (int)LZ4_64KLIMIT) return LZ4_compress64k_stack_limitedOutput(source, dest, inputSize, maxOutputSize);
+ return LZ4_compress_stack_limitedOutput(source, dest, inputSize, maxOutputSize);
+#endif
+}
+
+
+//****************************
+// Decompression functions
+//****************************
+
+typedef enum { noPrefix = 0, withPrefix = 1 } prefix64k_directive;
+typedef enum { endOnOutputSize = 0, endOnInputSize = 1 } end_directive;
+typedef enum { full = 0, partial = 1 } exit_directive;
+
+
+// This generic decompression function cover all use cases.
+// It shall be instanciated several times, using different sets of directives
+// Note that it is essential this generic function is really inlined,
+// in order to remove useless branches during compilation optimisation.
+static inline int LZ4_decompress_generic(
+ const char* source,
+ char* dest,
+ int inputSize, //
+ int outputSize, // OutputSize must be != 0; if endOnInput==endOnInputSize, this value is the max size of Output Buffer.
+
+ int endOnInput, // endOnOutputSize, endOnInputSize
+ int prefix64k, // noPrefix, withPrefix
+ int partialDecoding, // full, partial
+ int targetOutputSize // only used if partialDecoding==partial
+ )
+{
+ // Local Variables
+ const BYTE* restrict ip = (const BYTE*) source;
+ const BYTE* ref;
+ const BYTE* const iend = ip + inputSize;
+
+ BYTE* op = (BYTE*) dest;
+ BYTE* const oend = op + outputSize;
+ BYTE* cpy;
+ BYTE* oexit = op + targetOutputSize;
+
+ size_t dec32table[] = {0, 3, 2, 3, 0, 0, 0, 0};
+#if LZ4_ARCH64
+ size_t dec64table[] = {0, 0, 0, (size_t)-1, 0, 1, 2, 3};
+#endif
+
+
+ // Special case
+ if ((partialDecoding) && (oexit> oend-MFLIMIT)) oexit = oend-MFLIMIT; // targetOutputSize too large, better decode everything
+ if unlikely(outputSize==0) goto _output_error; // Empty output buffer
+
+
+ // Main Loop
+ while (1)
+ {
+ unsigned token;
+ size_t length;
+
+ // get runlength
+ token = *ip++;
+ if ((length=(token>>ML_BITS)) == RUN_MASK)
+ {
+ unsigned s=255;
+ while (((endOnInput)?ip<iend:1) && (s==255))
+ {
+ s = *ip++;
+ length += s;
+ }
+ }
+
+ // copy literals
+ cpy = op+length;
+ if (((endOnInput) && ((cpy>(partialDecoding?oexit:oend-MFLIMIT)) || (ip+length>iend-(2+1+LASTLITERALS))) )
+ || ((!endOnInput) && (cpy>oend-COPYLENGTH)))
+ {
+ if (partialDecoding)
+ {
+ if (cpy > oend) goto _output_error; // Error : write attempt beyond end of output buffer
+ if ((endOnInput) && (ip+length > iend)) goto _output_error; // Error : read attempt beyond end of input buffer
+ }
+ else
+ {
+ if ((!endOnInput) && (cpy != oend)) goto _output_error; // Error : block decoding must stop exactly there, due to parsing restrictions
+ if ((endOnInput) && ((ip+length != iend) || (cpy > oend))) goto _output_error; // Error : not enough place for another match (min 4) + 5 literals
+ }
+ memcpy(op, ip, length);
+ ip += length;
+ op += length;
+ break; // Necessarily EOF, due to parsing restrictions
+ }
+ LZ4_WILDCOPY(ip, op, cpy); ip -= (op-cpy); op = cpy;
+
+ // get offset
+ LZ4_READ_LITTLEENDIAN_16(ref,cpy,ip); ip+=2;
+ if ((prefix64k==noPrefix) && unlikely(ref < (BYTE* const)dest)) goto _output_error; // Error : offset outside destination buffer
+
+ // get matchlength
+ if ((length=(token&ML_MASK)) == ML_MASK)
+ {
+ while (endOnInput ? ip<iend-(LASTLITERALS+1) : 1) // A minimum nb of input bytes must remain for LASTLITERALS + token
+ {
+ unsigned s = *ip++;
+ length += s;
+ if (s==255) continue;
+ break;
+ }
+ }
+
+ // copy repeated sequence
+ if unlikely((op-ref)<STEPSIZE)
+ {
+#if LZ4_ARCH64
+ size_t dec64 = dec64table[op-ref];
+#else
+ const size_t dec64 = 0;
+#endif
+ op[0] = ref[0];
+ op[1] = ref[1];
+ op[2] = ref[2];
+ op[3] = ref[3];
+ op += 4, ref += 4; ref -= dec32table[op-ref];
+ A32(op) = A32(ref);
+ op += STEPSIZE-4; ref -= dec64;
+ } else { LZ4_COPYSTEP(ref,op); }
+ cpy = op + length - (STEPSIZE-4);
+
+ if unlikely(cpy>oend-(COPYLENGTH)-(STEPSIZE-4))
+ {
+ if (cpy > oend-LASTLITERALS) goto _output_error; // Error : last 5 bytes must be literals
+ LZ4_SECURECOPY(ref, op, (oend-COPYLENGTH));
+ while(op<cpy) *op++=*ref++;
+ op=cpy;
+ continue;
+ }
+ LZ4_WILDCOPY(ref, op, cpy);
+ op=cpy; // correction
+ }
+
+ // end of decoding
+ if (endOnInput)
+ return (int) (((char*)op)-dest); // Nb of output bytes decoded
+ else
+ return (int) (((char*)ip)-source); // Nb of input bytes read
+
+ // Overflow error detected
+_output_error:
+ return (int) (-(((char*)ip)-source))-1;
+}
+
+
+int LZ4_decompress_safe(const char* source, char* dest, int inputSize, int maxOutputSize)
+{
+ return LZ4_decompress_generic(source, dest, inputSize, maxOutputSize, endOnInputSize, noPrefix, full, 0);
+}
+
+int LZ4_decompress_fast(const char* source, char* dest, int outputSize)
+{
+ return LZ4_decompress_generic(source, dest, 0, outputSize, endOnOutputSize, noPrefix, full, 0);
+}
+
+int LZ4_decompress_safe_withPrefix64k(const char* source, char* dest, int inputSize, int maxOutputSize)
+{
+ return LZ4_decompress_generic(source, dest, inputSize, maxOutputSize, endOnInputSize, withPrefix, full, 0);
+}
+
+int LZ4_decompress_fast_withPrefix64k(const char* source, char* dest, int outputSize)
+{
+ return LZ4_decompress_generic(source, dest, 0, outputSize, endOnOutputSize, withPrefix, full, 0);
+}
+
+int LZ4_decompress_safe_partial(const char* source, char* dest, int inputSize, int targetOutputSize, int maxOutputSize)
+{
+ return LZ4_decompress_generic(source, dest, inputSize, maxOutputSize, endOnInputSize, noPrefix, partial, targetOutputSize);
+}
+
projects / bacula / bacula / commitdiff