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121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
#include <lzma.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/errno.h>
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#define CHUNKSIZE 4096
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#define MEMLIMIT (32 * 1024 * 1204)
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void pixzlist_listfile(char *fname, FILE *f);
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lzma_index *pixzlist_index(char *fname, FILE *f);
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int main(int argc, char **argv) {
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for (int i = 1; i < argc; ++i) {
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char *fname = argv[i];
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FILE *f = fopen(fname, "r");
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if (f == NULL) {
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fprintf(stderr, "Can't open file '%s': %s.\n", fname, strerror(errno));
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continue;
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}
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pixzlist_listfile(fname, f);
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fclose(f);
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if (i != argc - 1)
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printf("\n");
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}
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return 0;
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}
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void pixzlist_listfile(char *fname, FILE *f) {
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lzma_index *index = pixzlist_index(fname, f);
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if (!index)
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return;
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printf("%s:\n", fname);
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lzma_index_record rec;
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while (!lzma_index_read(index, &rec)) {
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printf("%llu / %llu\n", rec.unpadded_size, rec.uncompressed_size);
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}
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lzma_index_end(index, NULL);
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}
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lzma_index *pixzlist_index(char *fname, FILE *f) {
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// Seek to footer
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if (fseek(f, -LZMA_STREAM_HEADER_SIZE, SEEK_END) == -1) {
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fprintf(stderr, "Can't seek to footer in '%s': %s.\n",
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fname, strerror(errno));
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return NULL;
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}
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// Read footer
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uint8_t header[LZMA_STREAM_HEADER_SIZE];
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if (fread(header, LZMA_STREAM_HEADER_SIZE, 1, f) != 1) {
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fprintf(stderr, "Can't read footer from '%s': %s.\n",
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fname, strerror(errno));
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return NULL;
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}
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// Decode footer
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lzma_stream_flags flags;
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lzma_ret lerr = lzma_stream_footer_decode(&flags, header);
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if (lerr != LZMA_OK) {
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if (lerr == LZMA_FORMAT_ERROR)
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fprintf(stderr, "'%s' isn't an LZMA file.\n", fname);
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else if (lerr == LZMA_DATA_ERROR)
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fprintf(stderr, "CRC mismatch in '%s' footer.\n", fname);
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else
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fprintf(stderr, "Error #%d decoding footer of '%s'.\n", lerr, fname);
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return NULL;
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}
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// Seek to index
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if (fseek(f, -LZMA_STREAM_HEADER_SIZE - flags.backward_size, SEEK_END) == -1) {
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fprintf(stderr, "Can't seek to index in '%s': %s.\n",
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fname, strerror(errno));
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return NULL;
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}
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// Create index decoder
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uint8_t chunk[CHUNKSIZE];
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lzma_stream stream = LZMA_STREAM_INIT;
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lzma_index *index = NULL;
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lerr = lzma_index_decoder(&stream, &index, MEMLIMIT);
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if (lerr != LZMA_OK) {
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fprintf(stderr, "Error #%d starting decoding index of '%s'.\n",
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lerr, fname);
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return NULL;
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}
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// Decode index
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while (lerr != LZMA_STREAM_END) {
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size_t rd = fread(chunk, 1, CHUNKSIZE, f);
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if (rd == 0) {
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fprintf(stderr, "Error reading index from '%s': %s.\n",
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fname, strerror(errno));
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goto index_err;
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}
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stream.next_in = chunk;
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stream.avail_in = rd;
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while (stream.avail_in != 0 && lerr != LZMA_STREAM_END) {
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lerr = lzma_code(&stream, LZMA_RUN);
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if (lerr != LZMA_OK && lerr != LZMA_STREAM_END) {
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fprintf(stderr, "Error #%d starting decoding index of '%s'.\n",
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lerr, fname);
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goto index_err;
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}
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}
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}
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lzma_end(&stream);
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return index;
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index_err:
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lzma_end(&stream);
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lzma_index_end(index, NULL);
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return NULL;
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}
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