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960ccca680
Add config variables pack.compression and core.loosecompression , and switch --compression=level to pack-objects. Loose objects will be compressed using core.loosecompression if set, else core.compression if set, else Z_BEST_SPEED. Packed objects will be compressed using --compression=level if seen, else pack.compression if set, else core.compression if set, else Z_DEFAULT_COMPRESSION. This is the "pack compression level". Loose objects added to a pack undeltified will be recompressed to the pack compression level if it is unequal to the current loose compression level by the preceding rules, or if the loose object was written while core.legacyheaders = true. Newly deltified loose objects are always compressed to the current pack compression level. Previously packed objects added to a pack are recompressed to the current pack compression level exactly when their deltification status changes, since the previous pack data cannot be reused. In either case, the --no-reuse-object switch from the first patch below will always force recompression to the current pack compression level, instead of assuming the pack compression level hasn't changed and pack data can be reused when possible. This applies on top of the following patches from Nicolas Pitre: [PATCH] allow for undeltified objects not to be reused [PATCH] make "repack -f" imply "pack-objects --no-reuse-object" Signed-off-by: Dana L. How <danahow@gmail.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
160 lines
3.1 KiB
C
160 lines
3.1 KiB
C
/*
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* csum-file.c
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*
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* Copyright (C) 2005 Linus Torvalds
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*
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* Simple file write infrastructure for writing SHA1-summed
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* files. Useful when you write a file that you want to be
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* able to verify hasn't been messed with afterwards.
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*/
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#include "cache.h"
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#include "csum-file.h"
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static void sha1flush(struct sha1file *f, unsigned int count)
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{
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void *buf = f->buffer;
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for (;;) {
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int ret = xwrite(f->fd, buf, count);
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if (ret > 0) {
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buf = (char *) buf + ret;
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count -= ret;
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if (count)
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continue;
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return;
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}
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if (!ret)
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die("sha1 file '%s' write error. Out of diskspace", f->name);
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die("sha1 file '%s' write error (%s)", f->name, strerror(errno));
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}
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}
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int sha1close(struct sha1file *f, unsigned char *result, int update)
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{
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unsigned offset = f->offset;
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if (offset) {
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SHA1_Update(&f->ctx, f->buffer, offset);
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sha1flush(f, offset);
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}
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SHA1_Final(f->buffer, &f->ctx);
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if (result)
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hashcpy(result, f->buffer);
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if (update)
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sha1flush(f, 20);
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if (close(f->fd))
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die("%s: sha1 file error on close (%s)", f->name, strerror(errno));
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free(f);
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return 0;
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}
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int sha1write(struct sha1file *f, void *buf, unsigned int count)
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{
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if (f->do_crc)
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f->crc32 = crc32(f->crc32, buf, count);
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while (count) {
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unsigned offset = f->offset;
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unsigned left = sizeof(f->buffer) - offset;
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unsigned nr = count > left ? left : count;
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memcpy(f->buffer + offset, buf, nr);
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count -= nr;
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offset += nr;
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buf = (char *) buf + nr;
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left -= nr;
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if (!left) {
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SHA1_Update(&f->ctx, f->buffer, offset);
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sha1flush(f, offset);
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offset = 0;
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}
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f->offset = offset;
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}
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return 0;
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}
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struct sha1file *sha1create(const char *fmt, ...)
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{
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struct sha1file *f;
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unsigned len;
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va_list arg;
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int fd;
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f = xmalloc(sizeof(*f));
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va_start(arg, fmt);
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len = vsnprintf(f->name, sizeof(f->name), fmt, arg);
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va_end(arg);
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if (len >= PATH_MAX)
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die("you wascally wabbit, you");
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f->namelen = len;
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fd = open(f->name, O_CREAT | O_EXCL | O_WRONLY, 0666);
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if (fd < 0)
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die("unable to open %s (%s)", f->name, strerror(errno));
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f->fd = fd;
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f->error = 0;
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f->offset = 0;
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f->do_crc = 0;
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SHA1_Init(&f->ctx);
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return f;
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}
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struct sha1file *sha1fd(int fd, const char *name)
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{
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struct sha1file *f;
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unsigned len;
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f = xmalloc(sizeof(*f));
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len = strlen(name);
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if (len >= PATH_MAX)
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die("you wascally wabbit, you");
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f->namelen = len;
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memcpy(f->name, name, len+1);
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f->fd = fd;
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f->error = 0;
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f->offset = 0;
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f->do_crc = 0;
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SHA1_Init(&f->ctx);
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return f;
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}
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int sha1write_compressed(struct sha1file *f, void *in, unsigned int size, int level)
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{
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z_stream stream;
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unsigned long maxsize;
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void *out;
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memset(&stream, 0, sizeof(stream));
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deflateInit(&stream, level);
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maxsize = deflateBound(&stream, size);
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out = xmalloc(maxsize);
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/* Compress it */
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stream.next_in = in;
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stream.avail_in = size;
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stream.next_out = out;
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stream.avail_out = maxsize;
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while (deflate(&stream, Z_FINISH) == Z_OK)
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/* nothing */;
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deflateEnd(&stream);
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size = stream.total_out;
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sha1write(f, out, size);
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free(out);
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return size;
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}
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void crc32_begin(struct sha1file *f)
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{
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f->crc32 = crc32(0, Z_NULL, 0);
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f->do_crc = 1;
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}
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uint32_t crc32_end(struct sha1file *f)
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{
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f->do_crc = 0;
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return f->crc32;
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}
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