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#include "pixz.h"
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#include <archive.h>
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#include <archive_entry.h>
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#pragma mark DEFINES
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#define ENCODE_THREADS 2
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#pragma mark TYPES
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typedef enum {
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MSG_BLOCK,
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MSG_STOP,
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} msg_type_t;
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typedef struct io_block_t io_block_t;
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struct io_block_t {
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size_t seq;
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io_block_t *next;
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lzma_block block;
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uint8_t *input, *output;
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size_t insize, outsize;
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};
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#pragma mark GLOBALS
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static pthread_t gEncodeThreads[ENCODE_THREADS];
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static pthread_t gReadThread;
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static queue_t *gEncodeQ, *gWriteQ;
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static size_t gBlockInSize = 0, gBlockOutSize = 0;
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static off_t gMultiHeaderStart = 0;
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static bool gMultiHeader = false;
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static off_t gTotalRead = 0;
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static size_t gBlockNum = 0;
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static io_block_t *gReadBlock = NULL;
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static lzma_filter gFilters[LZMA_FILTERS_MAX + 1];
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static FILE *gOutFile = NULL;
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static uint8_t gFileIndexBuf[CHUNKSIZE];
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static size_t gFileIndexBufPos = 0;
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#pragma mark FUNCTION DECLARATIONS
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static void *read_thread(void *data);
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static void *encode_thread(void *data);
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static bool is_multi_header(const char *name);
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static void add_file(off_t offset, const char *name);
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static archive_read_callback tar_read;
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static archive_open_callback tar_ok;
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static archive_close_callback tar_ok;
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static void block_init(lzma_block *block);
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static void stream_edge(lzma_vli backward_size);
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static void write_blocks(io_block_t **ibs, size_t *seq);
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static void encode_index(void);
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static void write_file_index(void);
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static void write_file_index_bytes(size_t size, uint8_t *buf);
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static void write_file_index_buf(lzma_action action);
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#pragma mark FUNCTION DEFINITIONS
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int main(int argc, char **argv) {
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if (argc != 3)
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die("Need two arguments");
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if (!(gInFile = fopen(argv[1], "r")))
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die("Can't open input file");
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if (!(gOutFile = fopen(argv[2], "w")))
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die("Can't open output file");
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// xz options
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lzma_options_lzma lzma_opts;
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if (lzma_lzma_preset(&lzma_opts, LZMA_PRESET_DEFAULT))
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die("Error setting lzma options");
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gFilters[0] = (lzma_filter){ .id = LZMA_FILTER_LZMA2,
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.options = &lzma_opts };
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gFilters[1] = (lzma_filter){ .id = LZMA_VLI_UNKNOWN, .options = NULL };
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gBlockInSize = lzma_opts.dict_size * 2.0;
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gBlockOutSize = lzma_block_buffer_bound(gBlockInSize);
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// thread setup
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gEncodeQ = queue_new();
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gWriteQ = queue_new();
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if (pthread_create(&gReadThread, NULL, &read_thread, NULL))
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die("Error creating read thread");
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for (int i = 0; i < ENCODE_THREADS; ++i) {
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if (pthread_create(&gEncodeThreads[i], NULL, &encode_thread, NULL))
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die("Error creating encode thread");
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}
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// pre-block setup: header, index
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if (!(gIndex = lzma_index_init(NULL, NULL)))
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die("Error creating index");
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stream_edge(LZMA_VLI_UNKNOWN);
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// write blocks
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size_t seq = 0;
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io_block_t *ibs = NULL;
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while (true) {
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io_block_t *ib;
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int msg = queue_pop(gWriteQ, (void**)&ib);
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if (msg == MSG_STOP)
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break;
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ib->next = ibs;
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ibs = ib;
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write_blocks(&ibs, &seq);
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}
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// file index
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write_file_index();
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free_file_index();
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// post-block cleanup: index, footer
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encode_index();
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stream_edge(lzma_index_size(gIndex));
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lzma_index_end(gIndex, NULL);
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fclose(gOutFile);
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// thread cleanup
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if (pthread_join(gReadThread, NULL))
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die("Error joining read thread");
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queue_free(gEncodeQ);
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queue_free(gWriteQ);
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return 0;
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}
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#pragma mark READING
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static void *read_thread(void *data) {
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struct archive *ar = archive_read_new();
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archive_read_support_compression_none(ar);
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archive_read_support_format_tar(ar);
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archive_read_open(ar, NULL, tar_ok, tar_read, tar_ok);
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struct archive_entry *entry;
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while (true) {
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int aerr = archive_read_next_header(ar, &entry);
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if (aerr == ARCHIVE_EOF) {
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// TODO
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break;
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} else if (aerr != ARCHIVE_OK && aerr != ARCHIVE_WARN) {
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// Some charset translations warn spuriously
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fprintf(stderr, "%s\n", archive_error_string(ar));
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die("Error reading archive entry");
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}
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add_file(archive_read_header_position(ar),
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archive_entry_pathname(entry));
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}
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archive_read_finish(ar);
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fclose(gInFile);
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add_file(gTotalRead, NULL);
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// write last block, if necessary
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if (gReadBlock) {
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if (gReadBlock->insize) {
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queue_push(gEncodeQ, MSG_BLOCK, gReadBlock);
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} else { // if this block had only one read, and it was EOF
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free(gReadBlock->input);
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free(gReadBlock->output);
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free(gReadBlock);
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}
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}
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// stop the other threads
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for (int i = 0; i < ENCODE_THREADS; ++i) {
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queue_push(gEncodeQ, MSG_STOP, NULL);
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}
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for (int i = 0; i < ENCODE_THREADS; ++i) {
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if (pthread_join(gEncodeThreads[i], NULL))
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die("Error joining encode thread");
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}
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queue_push(gWriteQ, MSG_STOP, NULL);
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return NULL;
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}
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static ssize_t tar_read(struct archive *ar, void *ref, const void **bufp) {
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if (!gReadBlock) {
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gReadBlock = malloc(sizeof(io_block_t));
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gReadBlock->input = malloc(gBlockInSize);
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gReadBlock->output = malloc(gBlockOutSize);
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gReadBlock->insize = 0;
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gReadBlock->seq = gBlockNum++;
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}
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size_t space = gBlockInSize - gReadBlock->insize;
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if (space > CHUNKSIZE)
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space = CHUNKSIZE;
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uint8_t *buf = gReadBlock->input + gReadBlock->insize;
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size_t rd = fread(buf, 1, space, gInFile);
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if (ferror(gInFile))
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die("Error reading input file");
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gReadBlock->insize += rd;
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gTotalRead += rd;
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*bufp = buf;
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if (gReadBlock->insize == gBlockInSize) {
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queue_push(gEncodeQ, MSG_BLOCK, gReadBlock);
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gReadBlock = NULL;
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}
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return rd;
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}
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static int tar_ok(struct archive *ar, void *ref) {
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return ARCHIVE_OK;
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}
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static bool is_multi_header(const char *name) {
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size_t i = strlen(name);
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while (i != 0 && name[i - 1] != '/')
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--i;
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return strncmp(name + i, "._", 2) == 0;
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}
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static void add_file(off_t offset, const char *name) {
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if (name && is_multi_header(name)) {
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if (!gMultiHeader)
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gMultiHeaderStart = offset;
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gMultiHeader = true;
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return;
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}
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file_index_t *f = malloc(sizeof(file_index_t));
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f->offset = gMultiHeader ? gMultiHeaderStart : offset;
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gMultiHeader = false;
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f->name = name ? xstrdup(name) : NULL;
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f->next = NULL;
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if (gLastFile) {
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gLastFile->next = f;
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} else { // new index
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gFileIndex = f;
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}
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gLastFile = f;
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}
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#pragma mark ENCODING
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static void *encode_thread(void *vp) {
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while (true) {
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io_block_t *ib;
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int msg = queue_pop(gEncodeQ, (void**)&ib);
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if (msg == MSG_STOP)
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break;
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block_init(&ib->block);
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ib->outsize = 0;
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if (lzma_block_buffer_encode(&ib->block, NULL, ib->input, ib->insize,
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ib->output, &ib->outsize, gBlockOutSize) != LZMA_OK)
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die("Error encoding block");
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queue_push(gWriteQ, MSG_BLOCK, ib);
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}
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return NULL;
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}
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#pragma mark WRITING
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static void block_init(lzma_block *block) {
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block->version = 0;
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block->check = CHECK;
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block->filters = gFilters;
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block->compressed_size = block->uncompressed_size = LZMA_VLI_UNKNOWN;
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if (lzma_block_header_size(block) != LZMA_OK)
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die("Error getting block header size");
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}
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static void stream_edge(lzma_vli backward_size) {
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lzma_stream_flags flags = { .version = 0, .check = CHECK,
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.backward_size = backward_size };
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uint8_t buf[LZMA_STREAM_HEADER_SIZE];
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lzma_ret (*encoder)(const lzma_stream_flags *flags, uint8_t *buf);
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encoder = backward_size == LZMA_VLI_UNKNOWN
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? &lzma_stream_header_encode
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: &lzma_stream_footer_encode;
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if ((*encoder)(&flags, buf) != LZMA_OK)
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die("Error encoding stream edge");
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if (fwrite(buf, LZMA_STREAM_HEADER_SIZE, 1, gOutFile) != 1)
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die("Error writing stream edge");
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}
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static void write_blocks(io_block_t **ibs, size_t *seq) {
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// check if we can write anything
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bool block_missing = false;
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while (!block_missing) {
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block_missing = true; // assume no match
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io_block_t *prev = NULL;
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for (io_block_t *ib = *ibs; ib; ib = ib->next) {
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if (ib->seq == *seq) { // we have the next block
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if (fwrite(ib->output, ib->outsize, 1, gOutFile) != 1)
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die("Error writing block data");
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if (lzma_index_append(gIndex, NULL,
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lzma_block_unpadded_size(&ib->block),
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ib->block.uncompressed_size) != LZMA_OK)
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die("Error adding to index");
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// remove the found block
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if (prev) {
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prev->next = ib->next;
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} else {
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*ibs = ib->next;
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}
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free(ib->input);
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free(ib->output);
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free(ib);
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++*seq;
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block_missing = false;
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break;
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}
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prev = ib;
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} // for io_block_t
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} // while !block_missing
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}
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static void encode_index(void) {
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if (lzma_index_encoder(&gStream, gIndex) != LZMA_OK)
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die("Error creating index encoder");
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uint8_t obuf[CHUNKSIZE];
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lzma_ret err = LZMA_OK;
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while (err != LZMA_STREAM_END) {
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gStream.next_out = obuf;
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gStream.avail_out = CHUNKSIZE;
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err = lzma_code(&gStream, LZMA_RUN);
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if (err != LZMA_OK && err != LZMA_STREAM_END)
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die("Error encoding index");
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if (gStream.avail_out != CHUNKSIZE) {
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if (fwrite(obuf, CHUNKSIZE - gStream.avail_out, 1, gOutFile) != 1)
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die("Error writing index data");
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}
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}
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lzma_end(&gStream);
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}
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static void write_file_index(void) {
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lzma_block block;
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block_init(&block);
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uint8_t hdrbuf[block.header_size];
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if (lzma_block_header_encode(&block, hdrbuf) != LZMA_OK)
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die("Error encoding file index header");
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if (fwrite(hdrbuf, block.header_size, 1, gOutFile) != 1)
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die("Error writing file index header");
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if (lzma_block_encoder(&gStream, &block) != LZMA_OK)
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die("Error creating file index encoder");
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uint8_t offbuf[sizeof(uint64_t)];
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for (file_index_t *f = gFileIndex; f != NULL; f = f->next) {
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char *name = f->name ? f->name : "";
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size_t len = strlen(name);
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write_file_index_bytes(len + 1, (uint8_t*)name);
|
|
|
|
xle64enc(offbuf, f->offset);
|
|
|
|
write_file_index_bytes(sizeof(offbuf), offbuf);
|
|
|
|
}
|
|
|
|
write_file_index_buf(LZMA_FINISH);
|
|
|
|
|
|
|
|
if (lzma_index_append(gIndex, NULL, lzma_block_unpadded_size(&block),
|
|
|
|
block.uncompressed_size) != LZMA_OK)
|
|
|
|
die("Error adding file-index to index");
|
|
|
|
lzma_end(&gStream);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void write_file_index_bytes(size_t size, uint8_t *buf) {
|
|
|
|
size_t bufpos = 0;
|
|
|
|
while (bufpos < size) {
|
|
|
|
size_t len = size - bufpos;
|
|
|
|
size_t space = CHUNKSIZE - gFileIndexBufPos;
|
|
|
|
if (len > space)
|
|
|
|
len = space;
|
|
|
|
memcpy(gFileIndexBuf + gFileIndexBufPos, buf + bufpos, len);
|
|
|
|
gFileIndexBufPos += len;
|
|
|
|
bufpos += len;
|
|
|
|
|
|
|
|
if (gFileIndexBufPos == CHUNKSIZE) {
|
|
|
|
write_file_index_buf(LZMA_RUN);
|
|
|
|
gFileIndexBufPos = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void write_file_index_buf(lzma_action action) {
|
|
|
|
uint8_t obuf[CHUNKSIZE];
|
|
|
|
gStream.avail_in = gFileIndexBufPos;
|
|
|
|
gStream.next_in = gFileIndexBuf;
|
|
|
|
lzma_ret err = LZMA_OK;
|
|
|
|
while (err != LZMA_STREAM_END && (action == LZMA_FINISH || gStream.avail_in)) {
|
|
|
|
gStream.avail_out = CHUNKSIZE;
|
|
|
|
gStream.next_out = obuf;
|
|
|
|
err = lzma_code(&gStream, action);
|
|
|
|
if (err != LZMA_OK && err != LZMA_STREAM_END)
|
|
|
|
die("Error encoding file index");
|
|
|
|
if (gStream.avail_out != CHUNKSIZE) {
|
|
|
|
if (fwrite(obuf, CHUNKSIZE - gStream.avail_out, 1, gOutFile) != 1)
|
|
|
|
die("Error writing file index");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
gFileIndexBufPos = 0;
|
|
|
|
}
|