mirror of
https://git.proxmox.com/git/libgit2
synced 2025-05-15 14:19:43 +00:00
afeecf4f26
DIRECT WRITES ARE BACK AND FASTER THAN EVER. The streaming writer to the ODB was an overkill for the smaller objects like Commit and Tags; most of the streaming logic was taking too long. This commit makes Commits, Tags and Trees to be built-up in memory, and then written to disk in 2 pushes (header + data), instead of streaming everything. This is *always* faster, even for big files (since the git_filebuf class still does streaming writes when the memory cache overflows). This is also a gazillion lines of code smaller, because we don't have to precompute the final size of the object before starting the stream (this was kind of defeating the point of streaming, anyway). Blobs are still written with full streaming instead of loading them in memory, since this is still the fastest way. A new `git_buf` class has been added. It's missing some features, but it'll get there.
96 lines
1.8 KiB
C
96 lines
1.8 KiB
C
#include "buffer.h"
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#include "posix.h"
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#include <stdarg.h>
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#define ENSURE_SIZE(b, d) \
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if ((ssize_t)(d) >= buf->asize && git_buf_grow(b, (d)) < GIT_SUCCESS)\
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return;
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int git_buf_grow(git_buf *buf, size_t target_size)
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{
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char *new_ptr;
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if (buf->asize < 0)
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return GIT_ENOMEM;
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if (buf->asize == 0)
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buf->asize = target_size;
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/* grow the buffer size by 1.5, until it's big enough
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* to fit our target size */
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while (buf->asize < (int)target_size)
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buf->asize = (buf->asize << 1) - (buf->asize >> 1);
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new_ptr = git__realloc(buf->ptr, buf->asize);
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if (!new_ptr) {
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buf->asize = -1;
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return GIT_ENOMEM;
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}
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buf->ptr = new_ptr;
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return GIT_SUCCESS;
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}
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int git_buf_oom(const git_buf *buf)
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{
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return (buf->asize < 0);
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}
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void git_buf_putc(git_buf *buf, char c)
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{
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ENSURE_SIZE(buf, buf->size + 1);
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buf->ptr[buf->size++] = c;
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}
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void git_buf_put(git_buf *buf, const char *data, size_t len)
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{
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ENSURE_SIZE(buf, buf->size + len);
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memcpy(buf->ptr + buf->size, data, len);
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buf->size += len;
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}
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void git_buf_puts(git_buf *buf, const char *string)
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{
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git_buf_put(buf, string, strlen(string));
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}
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void git_buf_printf(git_buf *buf, const char *format, ...)
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{
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int len;
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va_list arglist;
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ENSURE_SIZE(buf, buf->size + 1);
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while (1) {
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va_start(arglist, format);
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len = p_vsnprintf(buf->ptr + buf->size, buf->asize - buf->size, format, arglist);
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va_end(arglist);
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if (len < 0) {
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buf->asize = -1;
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return;
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}
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if (len + 1 <= buf->asize - buf->size) {
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buf->size += len;
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return;
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}
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ENSURE_SIZE(buf, buf->size + len + 1);
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}
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}
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const char *git_buf_cstr(git_buf *buf)
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{
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if (buf->size + 1 >= buf->asize && git_buf_grow(buf, buf->size + 1) < GIT_SUCCESS)
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return NULL;
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buf->ptr[buf->size] = '\0';
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return buf->ptr;
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}
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void git_buf_free(git_buf *buf)
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{
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free(buf->ptr);
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}
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