/** * Copyright (c) 2017-present, Facebook, Inc. * All rights reserved. * * This source code is licensed under the BSD-style license found in the * LICENSE file in the root directory of this source tree. An additional grant * of patent rights can be found in the PATENTS file in the same directory. */ #include /* fprintf */ #include /* malloc, free */ #include /* pthread functions */ #include /* memset */ #include "zstd_internal.h" #include "util.h" #define DISPLAY(...) fprintf(stderr, __VA_ARGS__) #define PRINT(...) fprintf(stdout, __VA_ARGS__) #define DEBUG(l, ...) { if (g_displayLevel>=l) { DISPLAY(__VA_ARGS__); } } #define FILE_CHUNK_SIZE 4 << 20 #define MAX_NUM_JOBS 2 #define stdinmark "/*stdin*\\" #define stdoutmark "/*stdout*\\" #define MAX_PATH 256 #define DEFAULT_DISPLAY_LEVEL 1 #define DEFAULT_COMPRESSION_LEVEL 6 #define DEFAULT_ADAPT_PARAM 1 #define MAX_COMPRESSION_LEVEL_CHANGE 10 static int g_displayLevel = DEFAULT_DISPLAY_LEVEL; static unsigned g_compressionLevel = DEFAULT_COMPRESSION_LEVEL; static unsigned g_displayStats = 0; static UTIL_time_t g_startTime; static size_t g_streamedSize = 0; static unsigned g_useProgressBar = 0; static UTIL_freq_t g_ticksPerSecond; static unsigned g_forceCompressionLevel = 0; typedef struct { void* start; size_t size; size_t capacity; } buffer_t; typedef struct { size_t filled; buffer_t buffer; } inBuff_t; typedef struct { unsigned waitCompressed; unsigned waitReady; unsigned waitWrite; unsigned readyCounter; unsigned compressedCounter; unsigned writeCounter; } cStat_t; typedef struct { buffer_t src; buffer_t dst; unsigned compressionLevel; unsigned jobID; unsigned lastJob; size_t compressedSize; size_t dictSize; } jobDescription; typedef struct { pthread_mutex_t pMutex; int noError; } mutex_t; typedef struct { pthread_cond_t pCond; int noError; } cond_t; typedef struct { unsigned compressionLevel; unsigned numActiveThreads; unsigned numJobs; unsigned nextJobID; unsigned threadError; unsigned jobReadyID; unsigned jobCompressedID; unsigned jobWriteID; unsigned allJobsCompleted; unsigned adaptParam; unsigned completionMeasured; double completion; mutex_t jobCompressed_mutex; cond_t jobCompressed_cond; mutex_t jobReady_mutex; cond_t jobReady_cond; mutex_t allJobsCompleted_mutex; cond_t allJobsCompleted_cond; mutex_t jobWrite_mutex; cond_t jobWrite_cond; size_t lastDictSize; inBuff_t input; cStat_t stats; jobDescription* jobs; FILE* dstFile; ZSTD_CCtx* cctx; } adaptCCtx; typedef struct { FILE* srcFile; adaptCCtx* ctx; } fcResources; static void freeCompressionJobs(adaptCCtx* ctx) { unsigned u; for (u=0; unumJobs; u++) { jobDescription job = ctx->jobs[u]; free(job.dst.start); free(job.src.start); } } static int destroyMutex(mutex_t* mutex) { if (mutex->noError) { int const ret = pthread_mutex_destroy(&mutex->pMutex); return ret; } return 0; } static int destroyCond(cond_t* cond) { if (cond->noError) { int const ret = pthread_cond_destroy(&cond->pCond); return ret; } return 0; } static int freeCCtx(adaptCCtx* ctx) { if (!ctx) return 0; { int error = 0; error |= destroyMutex(&ctx->jobCompressed_mutex); error |= destroyCond(&ctx->jobCompressed_cond); error |= destroyMutex(&ctx->jobReady_mutex); error |= destroyCond(&ctx->jobReady_cond); error |= destroyMutex(&ctx->allJobsCompleted_mutex); error |= destroyCond(&ctx->allJobsCompleted_cond); error |= destroyMutex(&ctx->jobWrite_mutex); error |= destroyCond(&ctx->jobWrite_cond); error |= (ctx->dstFile != NULL && ctx->dstFile != stdout) ? fclose(ctx->dstFile) : 0; error |= ZSTD_isError(ZSTD_freeCCtx(ctx->cctx)); free(ctx->input.buffer.start); if (ctx->jobs){ freeCompressionJobs(ctx); free(ctx->jobs); } free(ctx); return error; } } static int initMutex(mutex_t* mutex) { int const ret = pthread_mutex_init(&mutex->pMutex, NULL); mutex->noError = !ret; return ret; } static int initCond(cond_t* cond) { int const ret = pthread_cond_init(&cond->pCond, NULL); cond->noError = !ret; return ret; } static adaptCCtx* createCCtx(unsigned numJobs, const char* const outFilename) { adaptCCtx* const ctx = calloc(1, sizeof(adaptCCtx)); if (ctx == NULL) { DISPLAY("Error: could not allocate space for context\n"); return NULL; } ctx->compressionLevel = g_compressionLevel; { int pthreadError = 0; pthreadError |= initMutex(&ctx->jobCompressed_mutex); pthreadError |= initCond(&ctx->jobCompressed_cond); pthreadError |= initMutex(&ctx->jobReady_mutex); pthreadError |= initCond(&ctx->jobReady_cond); pthreadError |= initMutex(&ctx->allJobsCompleted_mutex); pthreadError |= initCond(&ctx->allJobsCompleted_cond); pthreadError |= initMutex(&ctx->jobWrite_mutex); pthreadError |= initCond(&ctx->jobWrite_cond); if (pthreadError) return NULL; } ctx->numJobs = numJobs; ctx->jobReadyID = 0; ctx->jobCompressedID = 0; ctx->jobWriteID = 0; ctx->lastDictSize = 0; ctx->jobs = calloc(1, numJobs*sizeof(jobDescription)); /* initializing jobs */ { unsigned jobNum; for (jobNum=0; jobNumjobs[jobNum]; job->src.start = malloc(2 * FILE_CHUNK_SIZE); job->dst.start = malloc(ZSTD_compressBound(FILE_CHUNK_SIZE)); job->lastJob = 0; if (!job->src.start || !job->dst.start) { DISPLAY("Could not allocate buffers for jobs\n"); freeCCtx(ctx); return NULL; } job->src.capacity = FILE_CHUNK_SIZE; job->dst.capacity = ZSTD_compressBound(FILE_CHUNK_SIZE); } } ctx->nextJobID = 0; ctx->threadError = 0; ctx->allJobsCompleted = 0; ctx->adaptParam = DEFAULT_ADAPT_PARAM; ctx->cctx = ZSTD_createCCtx(); ctx->input.filled = 0; ctx->input.buffer.capacity = 2 * FILE_CHUNK_SIZE; ctx->input.buffer.start = malloc(ctx->input.buffer.capacity); if (!ctx->input.buffer.start) { DISPLAY("Error: could not allocate input buffer\n"); freeCCtx(ctx); return NULL; } if (!ctx->cctx) { DISPLAY("Error: could not allocate ZSTD_CCtx\n"); freeCCtx(ctx); return NULL; } if (!ctx->jobs) { DISPLAY("Error: could not allocate space for jobs during context creation\n"); freeCCtx(ctx); return NULL; } { unsigned const stdoutUsed = !strcmp(outFilename, stdoutmark); FILE* dstFile = stdoutUsed ? stdout : fopen(outFilename, "wb"); if (dstFile == NULL) { DISPLAY("Error: could not open output file\n"); freeCCtx(ctx); return NULL; } ctx->dstFile = dstFile; } return ctx; } static void waitUntilAllJobsCompleted(adaptCCtx* ctx) { if (!ctx) return; pthread_mutex_lock(&ctx->allJobsCompleted_mutex.pMutex); while (ctx->allJobsCompleted == 0) { pthread_cond_wait(&ctx->allJobsCompleted_cond.pCond, &ctx->allJobsCompleted_mutex.pMutex); } pthread_mutex_unlock(&ctx->allJobsCompleted_mutex.pMutex); } /* * Compression level is changed depending on which part of the compression process is lagging * Currently, three theads exist for job creation, compression, and file writing respectively. * adaptCompressionLevel() increments or decrements compression level based on which of the threads is lagging * job creation or file writing lag => increased compression level * compression thread lag => decreased compression level * detecting which thread is lagging is done by keeping track of how many calls each thread makes to pthread_cond_wait */ static unsigned adaptCompressionLevel(adaptCCtx* ctx) { if (g_forceCompressionLevel) { return g_compressionLevel; } else { unsigned reset = 0; unsigned const allSlow = ctx->adaptParam < ctx->stats.compressedCounter && ctx->adaptParam < ctx->stats.writeCounter && ctx->adaptParam < ctx->stats.readyCounter; unsigned const compressWaiting = ctx->adaptParam < ctx->stats.readyCounter; unsigned const writeWaiting = ctx->adaptParam < ctx->stats.compressedCounter; unsigned const createWaiting = ctx->adaptParam < ctx->stats.writeCounter; unsigned const writeSlow = ((compressWaiting && createWaiting) || (createWaiting && !writeWaiting)); unsigned const compressSlow = ((writeWaiting && createWaiting) || (writeWaiting && !compressWaiting)); unsigned const createSlow = ((compressWaiting && writeWaiting) || (compressWaiting && !createWaiting)); DEBUG(3, "ready: %u compressed: %u write: %u\n", ctx->stats.readyCounter, ctx->stats.compressedCounter, ctx->stats.writeCounter); if (allSlow) { reset = 1; } else if ((writeSlow || createSlow) && ctx->compressionLevel < (unsigned)ZSTD_maxCLevel()) { DEBUG(3, "increasing compression level %u\n", ctx->compressionLevel); ctx->compressionLevel++; reset = 1; } else if (compressSlow && ctx->compressionLevel > 1) { double const completion = ctx->completion; unsigned const maxChange = (unsigned)((1-completion) * MAX_COMPRESSION_LEVEL_CHANGE); unsigned const change = MIN(maxChange, ctx->compressionLevel - 1); DEBUG(3, "decreasing compression level %u\n", ctx->compressionLevel); DEBUG(2, "completion: %f\n", completion); ctx->compressionLevel -= change; reset = 1; } if (reset) { ctx->stats.readyCounter = 0; ctx->stats.writeCounter = 0; ctx->stats.compressedCounter = 0; ctx->completion = 1; ctx->completionMeasured = 0; } return ctx->compressionLevel; } } static size_t getUseableDictSize(unsigned compressionLevel) { ZSTD_parameters params = ZSTD_getParams(compressionLevel, 0, 0); unsigned overlapLog = compressionLevel >= (unsigned)ZSTD_maxCLevel() ? 0 : 3; size_t overlapSize = 1 << (params.cParams.windowLog - overlapLog); return overlapSize; } static void* compressionThread(void* arg) { adaptCCtx* ctx = (adaptCCtx*)arg; unsigned currJob = 0; for ( ; ; ) { unsigned const currJobIndex = currJob % ctx->numJobs; jobDescription* job = &ctx->jobs[currJobIndex]; DEBUG(3, "compressionThread(): waiting on job ready\n"); pthread_mutex_lock(&ctx->jobReady_mutex.pMutex); while(currJob + 1 > ctx->jobReadyID) { ctx->stats.waitReady++; ctx->stats.readyCounter++; DEBUG(3, "waiting on job ready, nextJob: %u\n", currJob); pthread_cond_wait(&ctx->jobReady_cond.pCond, &ctx->jobReady_mutex.pMutex); } pthread_mutex_unlock(&ctx->jobReady_mutex.pMutex); DEBUG(3, "compressionThread(): continuing after job ready\n"); DEBUG(3, "DICTIONARY ENDED\n"); DEBUG(3, "%.*s", (int)job->src.size, (char*)job->src.start); /* compress the data */ { unsigned const cLevel = adaptCompressionLevel(ctx); DEBUG(3, "cLevel used: %u\n", cLevel); DEBUG(3, "compression level used: %u\n", cLevel); /* begin compression */ { size_t const useDictSize = MIN(getUseableDictSize(cLevel), job->dictSize); DEBUG(2, "useDictSize: %zu, job->dictSize: %zu\n", useDictSize, job->dictSize); size_t const dictModeError = ZSTD_setCCtxParameter(ctx->cctx, ZSTD_p_forceRawDict, 1); size_t const initError = ZSTD_compressBegin_usingDict(ctx->cctx, job->src.start + job->dictSize - useDictSize, useDictSize, cLevel); size_t const windowSizeError = ZSTD_setCCtxParameter(ctx->cctx, ZSTD_p_forceWindow, 1); if (ZSTD_isError(dictModeError) || ZSTD_isError(initError) || ZSTD_isError(windowSizeError)) { DISPLAY("Error: something went wrong while starting compression\n"); ctx->threadError = 1; return arg; } } /* continue compression */ if (currJob != 0) { /* not first job flush/overwrite the frame header */ size_t const hSize = ZSTD_compressContinue(ctx->cctx, job->dst.start, job->dst.capacity, job->src.start + job->dictSize, 0); if (ZSTD_isError(hSize)) { DISPLAY("Error: something went wrong while continuing compression\n"); job->compressedSize = hSize; ctx->threadError = 1; return arg; } ZSTD_invalidateRepCodes(ctx->cctx); } job->compressedSize = (job->lastJob) ? ZSTD_compressEnd (ctx->cctx, job->dst.start, job->dst.capacity, job->src.start + job->dictSize, job->src.size) : ZSTD_compressContinue(ctx->cctx, job->dst.start, job->dst.capacity, job->src.start + job->dictSize, job->src.size); if (ZSTD_isError(job->compressedSize)) { DISPLAY("Error: something went wrong during compression: %s\n", ZSTD_getErrorName(job->compressedSize)); ctx->threadError = 1; return arg; } job->dst.size = job->compressedSize; } pthread_mutex_lock(&ctx->jobCompressed_mutex.pMutex); ctx->jobCompressedID++; DEBUG(3, "signaling for job %u\n", currJob); pthread_cond_signal(&ctx->jobCompressed_cond.pCond); pthread_mutex_unlock(&ctx->jobCompressed_mutex.pMutex); DEBUG(3, "finished job compression %u\n", currJob); currJob++; if (job->lastJob || ctx->threadError) { /* finished compressing all jobs */ DEBUG(3, "all jobs finished compressing\n"); break; } } return arg; } static void displayProgress(unsigned jobDoneID, unsigned cLevel, unsigned last) { if (!g_useProgressBar) return; UTIL_time_t currTime; UTIL_getTime(&currTime); double const timeElapsed = (double)(UTIL_getSpanTimeMicro(g_ticksPerSecond, g_startTime, currTime) / 1000.0); double const sizeMB = (double)g_streamedSize / (1 << 20); double const avgCompRate = sizeMB * 1000 / timeElapsed; fprintf(stderr, "\r| %4u jobs completed | Current Compresion Level: %2u | Time Elapsed: %5.0f ms | Data Size: %7.1f MB | Avg Compression Rate: %6.2f MB/s |", jobDoneID, cLevel, timeElapsed, sizeMB, avgCompRate); if (last) { fprintf(stderr, "\n"); } else { fflush(stderr); } } static void* outputThread(void* arg) { adaptCCtx* ctx = (adaptCCtx*)arg; unsigned currJob = 0; for ( ; ; ) { unsigned const currJobIndex = currJob % ctx->numJobs; jobDescription* job = &ctx->jobs[currJobIndex]; DEBUG(3, "outputThread(): waiting on job compressed\n"); pthread_mutex_lock(&ctx->jobCompressed_mutex.pMutex); while (currJob + 1 > ctx->jobCompressedID) { ctx->stats.waitCompressed++; ctx->stats.compressedCounter++; if (!ctx->completionMeasured) { ctx->completion = ZSTD_getCompletion(ctx->cctx); ctx->completionMeasured = 1; } DEBUG(2, "output detected completion: %f\n", ctx->completion); DEBUG(3, "waiting on job compressed, nextJob: %u\n", currJob); pthread_cond_wait(&ctx->jobCompressed_cond.pCond, &ctx->jobCompressed_mutex.pMutex); } pthread_mutex_unlock(&ctx->jobCompressed_mutex.pMutex); DEBUG(3, "outputThread(): continuing after job compressed\n"); { size_t const compressedSize = job->compressedSize; if (ZSTD_isError(compressedSize)) { DISPLAY("Error: an error occurred during compression\n"); ctx->threadError = 1; return arg; } { size_t const writeSize = fwrite(job->dst.start, 1, compressedSize, ctx->dstFile); if (writeSize != compressedSize) { DISPLAY("Error: an error occurred during file write operation\n"); ctx->threadError = 1; return arg; } } } DEBUG(3, "finished job write %u\n", currJob); currJob++; displayProgress(currJob, ctx->compressionLevel, job->lastJob); DEBUG(3, "locking job write mutex\n"); pthread_mutex_lock(&ctx->jobWrite_mutex.pMutex); ctx->jobWriteID++; pthread_cond_signal(&ctx->jobWrite_cond.pCond); pthread_mutex_unlock(&ctx->jobWrite_mutex.pMutex); DEBUG(3, "unlocking job write mutex\n"); if (job->lastJob || ctx->threadError) { /* finished with all jobs */ DEBUG(3, "all jobs finished writing\n"); pthread_mutex_lock(&ctx->allJobsCompleted_mutex.pMutex); ctx->allJobsCompleted = 1; pthread_cond_signal(&ctx->allJobsCompleted_cond.pCond); pthread_mutex_unlock(&ctx->allJobsCompleted_mutex.pMutex); break; } } return arg; } static int createCompressionJob(adaptCCtx* ctx, size_t srcSize, int last) { unsigned const nextJob = ctx->nextJobID; unsigned const nextJobIndex = nextJob % ctx->numJobs; jobDescription* job = &ctx->jobs[nextJobIndex]; DEBUG(3, "createCompressionJob(): wait for job write\n"); pthread_mutex_lock(&ctx->jobWrite_mutex.pMutex); DEBUG(3, "Creating new compression job -- nextJob: %u, jobCompressedID: %u, jobWriteID: %u, numJObs: %u\n", nextJob,ctx->jobCompressedID, ctx->jobWriteID, ctx->numJobs); while (nextJob - ctx->jobWriteID >= ctx->numJobs) { ctx->stats.waitWrite++; ctx->stats.writeCounter++; if (!ctx->completionMeasured) { ctx->completion = ZSTD_getCompletion(ctx->cctx); ctx->completionMeasured = 1; } DEBUG(2, "job creation detected completion %f\n", ctx->completion); DEBUG(3, "waiting on job Write, nextJob: %u\n", nextJob); pthread_cond_wait(&ctx->jobWrite_cond.pCond, &ctx->jobWrite_mutex.pMutex); } pthread_mutex_unlock(&ctx->jobWrite_mutex.pMutex); DEBUG(3, "createCompressionJob(): continuing after job write\n"); DEBUG(3, "filled: %zu, srcSize: %zu\n", ctx->input.filled, srcSize); job->compressionLevel = ctx->compressionLevel; job->src.size = srcSize; job->jobID = nextJob; job->lastJob = last; memcpy(job->src.start, ctx->input.buffer.start, ctx->lastDictSize + srcSize); job->dictSize = ctx->lastDictSize; pthread_mutex_lock(&ctx->jobReady_mutex.pMutex); ctx->jobReadyID++; pthread_cond_signal(&ctx->jobReady_cond.pCond); pthread_mutex_unlock(&ctx->jobReady_mutex.pMutex); DEBUG(3, "finished job creation %u\n", nextJob); ctx->nextJobID++; DEBUG(3, "filled: %zu, srcSize: %zu\n", ctx->input.filled, srcSize); /* if not on the last job, reuse data as dictionary in next job */ if (!last) { size_t const oldDictSize = ctx->lastDictSize; DEBUG(3, "oldDictSize %zu\n", oldDictSize); memmove(ctx->input.buffer.start, ctx->input.buffer.start + oldDictSize, srcSize); ctx->lastDictSize = srcSize; ctx->input.filled = srcSize; } return 0; } static void printStats(cStat_t stats) { DISPLAY("========STATISTICS========\n"); DISPLAY("# times waited on job ready: %u\n", stats.waitReady); DISPLAY("# times waited on job compressed: %u\n", stats.waitCompressed); DISPLAY("# times waited on job Write: %u\n\n", stats.waitWrite); } static int performCompression(adaptCCtx* ctx, FILE* const srcFile) { if (!ctx || !srcFile) { return 1; } /* create output thread */ { pthread_t out; if (pthread_create(&out, NULL, &outputThread, ctx)) { DISPLAY("Error: could not create output thread\n"); ctx->threadError = 1; return 1; } } /* create compression thread */ { pthread_t compression; if (pthread_create(&compression, NULL, &compressionThread, ctx)) { DISPLAY("Error: could not create compression thread\n"); ctx->threadError = 1; return 1; } } /* creating jobs */ for ( ; ; ) { size_t const readSize = fread(ctx->input.buffer.start + ctx->input.filled, 1, FILE_CHUNK_SIZE, srcFile); if (readSize != FILE_CHUNK_SIZE && !feof(srcFile)) { DISPLAY("Error: problem occurred during read from src file\n"); ctx->threadError = 1; return 1; } g_streamedSize += readSize; /* reading was fine, now create the compression job */ { int const last = feof(srcFile); int const error = createCompressionJob(ctx, readSize, last); if (error != 0) { ctx->threadError = 1; return error; } } if (feof(srcFile)) { DEBUG(3, "THE STREAM OF DATA ENDED %u\n", ctx->nextJobID); break; } } /* success -- created all jobs */ return 0; } static fcResources createFileCompressionResources(const char* const srcFilename, const char* const dstFilenameOrNull) { fcResources fcr; unsigned const stdinUsed = !strcmp(srcFilename, stdinmark); FILE* const srcFile = stdinUsed ? stdin : fopen(srcFilename, "rb"); const char* const outFilenameIntermediate = (stdinUsed && !dstFilenameOrNull) ? stdoutmark : dstFilenameOrNull; const char* outFilename = outFilenameIntermediate; char fileAndSuffix[MAX_PATH]; size_t const numJobs = MAX_NUM_JOBS; memset(&fcr, 0, sizeof(fcr)); if (!outFilenameIntermediate) { if (snprintf(fileAndSuffix, MAX_PATH, "%s.zst", srcFilename) + 1 > MAX_PATH) { DISPLAY("Error: output filename is too long\n"); return fcr; } outFilename = fileAndSuffix; } /* checking for errors */ if (!outFilename || !srcFile) { DISPLAY("Error: initial variables could not be allocated\n"); return fcr; } /* creating context */ fcr.ctx = createCCtx(numJobs, outFilename); fcr.srcFile = srcFile; return fcr; } static int freeFileCompressionResources(fcResources* fcr) { int ret = 0; waitUntilAllJobsCompleted(fcr->ctx); if (g_displayStats) printStats(fcr->ctx->stats); ret |= (fcr->srcFile != NULL) ? fclose(fcr->srcFile) : 0; ret |= (fcr->ctx != NULL) ? freeCCtx(fcr->ctx) : 0; return ret; } static int compressFilename(const char* const srcFilename, const char* const dstFilenameOrNull) { int ret = 0; UTIL_getTime(&g_startTime); g_streamedSize = 0; fcResources fcr = createFileCompressionResources(srcFilename, dstFilenameOrNull); ret |= performCompression(fcr.ctx, fcr.srcFile); ret |= freeFileCompressionResources(&fcr); return ret; } static int compressFilenames(const char** filenameTable, unsigned numFiles, unsigned forceStdout) { int ret = 0; unsigned fileNum; for (fileNum=0; fileNum MAX_UINT */ static unsigned readU32FromChar(const char** stringPtr) { unsigned result = 0; while ((**stringPtr >='0') && (**stringPtr <='9')) result *= 10, result += **stringPtr - '0', (*stringPtr)++ ; if ((**stringPtr=='K') || (**stringPtr=='M')) { result <<= 10; if (**stringPtr=='M') result <<= 10; (*stringPtr)++ ; if (**stringPtr=='i') (*stringPtr)++; if (**stringPtr=='B') (*stringPtr)++; } return result; } static void help() { PRINT("Usage:\n"); PRINT(" ./multi [options] [file(s)]\n"); PRINT("\n"); PRINT("Options:\n"); PRINT(" -oFILE : specify the output file name\n"); PRINT(" -v : display debug information\n"); PRINT(" -i# : provide initial compression level\n"); PRINT(" -s : display information stats\n"); PRINT(" -h : display help/information\n"); } /* return 0 if successful, else return error */ int main(int argCount, const char* argv[]) { const char* outFilename = NULL; const char** filenameTable = (const char**)malloc(argCount*sizeof(const char*)); unsigned filenameIdx = 0; filenameTable[0] = stdinmark; unsigned forceStdout = 0; int ret = 0; int argNum; UTIL_initTimer(&g_ticksPerSecond); if (filenameTable == NULL) { DISPLAY("Error: could not allocate sapce for filename table.\n"); return 1; } for (argNum=1; argNum 1) { switch (argument[1]) { case 'o': argument += 2; outFilename = argument; break; case 'v': g_displayLevel++; break; case 'i': argument += 2; g_compressionLevel = readU32FromChar(&argument); DEBUG(3, "g_compressionLevel: %u\n", g_compressionLevel); break; case 's': g_displayStats = 1; break; case 'h': help(); goto _main_exit; case 'p': g_useProgressBar = 1; break; case 'c': forceStdout = 1; outFilename = stdoutmark; break; case 'f': g_forceCompressionLevel = 1; break; default: DISPLAY("Error: invalid argument provided\n"); ret = 1; goto _main_exit; } continue; } /* regular files to be compressed */ filenameTable[filenameIdx++] = argument; } /* error checking with number of files */ if (filenameIdx > 1 && (outFilename != NULL && strcmp(outFilename, stdoutmark))) { DISPLAY("Error: multiple input files provided, cannot use specified output file\n"); ret = 1; goto _main_exit; } /* compress files */ if (filenameIdx <= 1) { ret |= compressFilename(filenameTable[0], outFilename); } else { ret |= compressFilenames(filenameTable, filenameIdx, forceStdout); } _main_exit: free(filenameTable); return ret; }